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1 /* |
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2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package javax.xml.bind; |
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27 |
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28 import java.util.Iterator; |
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29 import java.io.BufferedReader; |
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30 import java.io.IOException; |
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31 import java.io.InputStream; |
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32 import java.io.InputStreamReader; |
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33 import java.io.UnsupportedEncodingException; |
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34 import java.lang.reflect.InvocationTargetException; |
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35 import java.lang.reflect.Method; |
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36 import java.net.URL; |
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37 import java.util.Map; |
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38 import java.util.Properties; |
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39 import java.util.StringTokenizer; |
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40 import java.util.logging.ConsoleHandler; |
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41 import java.util.logging.Level; |
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42 import java.util.logging.Logger; |
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43 import java.security.AccessController; |
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44 |
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45 import static javax.xml.bind.JAXBContext.JAXB_CONTEXT_FACTORY; |
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46 |
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47 |
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48 /** |
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49 * This class is package private and therefore is not exposed as part of the |
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50 * JAXB API. |
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51 * |
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52 * This code is designed to implement the JAXB 1.0 spec pluggability feature |
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53 * |
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54 * @author <ul><li>Ryan Shoemaker, Sun Microsystems, Inc.</li></ul> |
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55 * @see JAXBContext |
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56 */ |
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57 class ContextFinder { |
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58 private static final Logger logger; |
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59 static { |
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60 logger = Logger.getLogger("javax.xml.bind"); |
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61 try { |
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62 if (AccessController.doPrivileged(new GetPropertyAction("jaxb.debug")) != null) { |
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63 // disconnect the logger from a bigger framework (if any) |
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64 // and take the matters into our own hands |
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65 logger.setUseParentHandlers(false); |
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66 logger.setLevel(Level.ALL); |
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67 ConsoleHandler handler = new ConsoleHandler(); |
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68 handler.setLevel(Level.ALL); |
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69 logger.addHandler(handler); |
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70 } else { |
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71 // don't change the setting of this logger |
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72 // to honor what other frameworks |
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73 // have done on configurations. |
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74 } |
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75 } catch(Throwable t) { |
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76 // just to be extra safe. in particular System.getProperty may throw |
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77 // SecurityException. |
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78 } |
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79 } |
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80 |
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81 /** |
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82 * If the {@link InvocationTargetException} wraps an exception that shouldn't be wrapped, |
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83 * throw the wrapped exception. |
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84 */ |
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85 private static void handleInvocationTargetException(InvocationTargetException x) throws JAXBException { |
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86 Throwable t = x.getTargetException(); |
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87 if( t != null ) { |
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88 if( t instanceof JAXBException ) |
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89 // one of our exceptions, just re-throw |
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90 throw (JAXBException)t; |
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91 if( t instanceof RuntimeException ) |
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92 // avoid wrapping exceptions unnecessarily |
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93 throw (RuntimeException)t; |
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94 if( t instanceof Error ) |
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95 throw (Error)t; |
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96 } |
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97 } |
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98 |
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99 |
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100 /** |
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101 * Determine if two types (JAXBContext in this case) will generate a ClassCastException. |
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102 * |
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103 * For example, (targetType)originalType |
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104 * |
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105 * @param originalType |
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106 * The Class object of the type being cast |
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107 * @param targetType |
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108 * The Class object of the type that is being cast to |
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109 * @return JAXBException to be thrown. |
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110 */ |
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111 private static JAXBException handleClassCastException(Class originalType, Class targetType) { |
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112 final URL targetTypeURL = which(targetType); |
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113 |
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114 return new JAXBException(Messages.format(Messages.ILLEGAL_CAST, |
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115 // we don't care where the impl class is, we want to know where JAXBContext lives in the impl |
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116 // class' ClassLoader |
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117 getClassClassLoader(originalType).getResource("javax/xml/bind/JAXBContext.class"), |
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118 targetTypeURL)); |
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119 } |
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120 |
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121 /** |
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122 * Create an instance of a class using the specified ClassLoader |
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123 */ |
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124 static JAXBContext newInstance( String contextPath, |
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125 String className, |
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126 ClassLoader classLoader, |
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127 Map properties ) |
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128 throws JAXBException { |
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129 try { |
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130 Class spFactory = safeLoadClass(className,classLoader); |
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131 return newInstance(contextPath, spFactory, classLoader, properties); |
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132 } catch (ClassNotFoundException x) { |
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133 throw new JAXBException( |
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134 Messages.format( Messages.PROVIDER_NOT_FOUND, className ), |
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135 x); |
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136 } catch (RuntimeException x) { |
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137 // avoid wrapping RuntimeException to JAXBException, |
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138 // because it indicates a bug in this code. |
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139 throw x; |
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140 } catch (Exception x) { |
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141 // can't catch JAXBException because the method is hidden behind |
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142 // reflection. Root element collisions detected in the call to |
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143 // createContext() are reported as JAXBExceptions - just re-throw it |
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144 // some other type of exception - just wrap it |
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145 throw new JAXBException( |
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146 Messages.format( Messages.COULD_NOT_INSTANTIATE, className, x ), |
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147 x); |
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148 } |
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149 } |
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150 |
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151 static JAXBContext newInstance( String contextPath, |
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152 Class spFactory, |
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153 ClassLoader classLoader, |
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154 Map properties ) |
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155 throws JAXBException |
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156 { |
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157 try { |
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158 /* |
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159 * javax.xml.bind.context.factory points to a class which has a |
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160 * static method called 'createContext' that |
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161 * returns a javax.xml.JAXBContext. |
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162 */ |
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163 |
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164 Object context = null; |
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165 |
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166 // first check the method that takes Map as the third parameter. |
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167 // this is added in 2.0. |
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168 try { |
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169 Method m = spFactory.getMethod("createContext",String.class,ClassLoader.class,Map.class); |
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170 // any failure in invoking this method would be considered fatal |
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171 context = m.invoke(null,contextPath,classLoader,properties); |
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172 } catch (NoSuchMethodException e) { |
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173 // it's not an error for the provider not to have this method. |
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174 } |
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175 |
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176 if(context==null) { |
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177 // try the old method that doesn't take properties. compatible with 1.0. |
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178 // it is an error for an implementation not to have both forms of the createContext method. |
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179 Method m = spFactory.getMethod("createContext",String.class,ClassLoader.class); |
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180 // any failure in invoking this method would be considered fatal |
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181 context = m.invoke(null,contextPath,classLoader); |
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182 } |
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183 |
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184 if(!(context instanceof JAXBContext)) { |
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185 // the cast would fail, so generate an exception with a nice message |
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186 throw handleClassCastException(context.getClass(), JAXBContext.class); |
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187 } |
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188 return (JAXBContext)context; |
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189 } catch (InvocationTargetException x) { |
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190 handleInvocationTargetException(x); |
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191 // for other exceptions, wrap the internal target exception |
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192 // with a JAXBException |
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193 Throwable e = x; |
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194 if(x.getTargetException()!=null) |
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195 e = x.getTargetException(); |
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196 |
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197 throw new JAXBException( Messages.format( Messages.COULD_NOT_INSTANTIATE, spFactory, e ), e ); |
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198 } catch (RuntimeException x) { |
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199 // avoid wrapping RuntimeException to JAXBException, |
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200 // because it indicates a bug in this code. |
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201 throw x; |
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202 } catch (Exception x) { |
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203 // can't catch JAXBException because the method is hidden behind |
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204 // reflection. Root element collisions detected in the call to |
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205 // createContext() are reported as JAXBExceptions - just re-throw it |
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206 // some other type of exception - just wrap it |
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207 throw new JAXBException( |
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208 Messages.format( Messages.COULD_NOT_INSTANTIATE, spFactory, x ), |
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209 x); |
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210 } |
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211 } |
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212 |
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213 |
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214 /** |
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215 * Create an instance of a class using the thread context ClassLoader |
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216 */ |
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217 static JAXBContext newInstance( |
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218 Class[] classes, |
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219 Map properties, |
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220 String className) throws JAXBException { |
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221 ClassLoader cl = getContextClassLoader(); |
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222 Class spi; |
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223 try { |
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224 spi = safeLoadClass(className,cl); |
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225 } catch (ClassNotFoundException e) { |
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226 throw new JAXBException(e); |
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227 } |
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228 |
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229 if(logger.isLoggable(Level.FINE)) { |
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230 // extra check to avoid costly which operation if not logged |
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231 logger.log(Level.FINE, "loaded {0} from {1}", new Object[]{className, which(spi)}); |
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232 } |
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233 |
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234 return newInstance(classes, properties, spi); |
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235 } |
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236 |
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237 static JAXBContext newInstance(Class[] classes, |
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238 Map properties, |
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239 Class spFactory) throws JAXBException { |
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240 Method m; |
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241 try { |
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242 m = spFactory.getMethod("createContext", Class[].class, Map.class); |
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243 } catch (NoSuchMethodException e) { |
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244 throw new JAXBException(e); |
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245 } |
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246 try { |
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247 Object context = m.invoke(null, classes, properties); |
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248 if(!(context instanceof JAXBContext)) { |
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249 // the cast would fail, so generate an exception with a nice message |
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250 throw handleClassCastException(context.getClass(), JAXBContext.class); |
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251 } |
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252 return (JAXBContext)context; |
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253 } catch (IllegalAccessException e) { |
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254 throw new JAXBException(e); |
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255 } catch (InvocationTargetException e) { |
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256 handleInvocationTargetException(e); |
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257 |
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258 Throwable x = e; |
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259 if (e.getTargetException() != null) |
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260 x = e.getTargetException(); |
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261 |
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262 throw new JAXBException(x); |
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263 } |
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264 } |
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265 |
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266 static JAXBContext find(String factoryId, String contextPath, ClassLoader classLoader, Map properties ) throws JAXBException { |
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267 |
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268 // TODO: do we want/need another layer of searching in $java.home/lib/jaxb.properties like JAXP? |
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269 |
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270 final String jaxbContextFQCN = JAXBContext.class.getName(); |
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271 |
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272 // search context path for jaxb.properties first |
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273 StringBuilder propFileName; |
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274 StringTokenizer packages = new StringTokenizer( contextPath, ":" ); |
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275 String factoryClassName; |
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276 |
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277 if(!packages.hasMoreTokens()) |
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278 // no context is specified |
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279 throw new JAXBException(Messages.format(Messages.NO_PACKAGE_IN_CONTEXTPATH)); |
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280 |
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281 |
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282 logger.fine("Searching jaxb.properties"); |
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283 |
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284 while( packages.hasMoreTokens() ) { |
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285 String packageName = packages.nextToken(":").replace('.','/'); |
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286 // com.acme.foo - > com/acme/foo/jaxb.properties |
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287 propFileName = new StringBuilder().append(packageName).append("/jaxb.properties"); |
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288 |
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289 Properties props = loadJAXBProperties( classLoader, propFileName.toString() ); |
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290 if (props != null) { |
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291 if (props.containsKey(factoryId)) { |
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292 factoryClassName = props.getProperty(factoryId); |
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293 return newInstance( contextPath, factoryClassName, classLoader, properties ); |
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294 } else { |
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295 throw new JAXBException(Messages.format(Messages.MISSING_PROPERTY, packageName, factoryId)); |
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296 } |
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297 } |
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298 } |
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299 |
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300 logger.fine("Searching the system property"); |
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301 |
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302 // search for a system property second (javax.xml.bind.JAXBContext) |
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303 factoryClassName = AccessController.doPrivileged(new GetPropertyAction(JAXBContext.JAXB_CONTEXT_FACTORY)); |
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304 if( factoryClassName != null ) { |
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305 return newInstance( contextPath, factoryClassName, classLoader, properties ); |
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306 } else { // leave this here to assure compatibility |
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307 factoryClassName = AccessController.doPrivileged(new GetPropertyAction(jaxbContextFQCN)); |
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308 if( factoryClassName != null ) { |
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309 return newInstance( contextPath, factoryClassName, classLoader, properties ); |
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310 } |
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311 } |
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312 |
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313 // OSGi search |
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314 Class jaxbContext = lookupJaxbContextUsingOsgiServiceLoader(); |
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315 if (jaxbContext != null) { |
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316 logger.fine("OSGi environment detected"); |
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317 return newInstance(contextPath, jaxbContext, classLoader, properties); |
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318 } |
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319 |
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320 logger.fine("Searching META-INF/services"); |
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321 // search META-INF services next |
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322 BufferedReader r = null; |
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323 try { |
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324 final StringBuilder resource = new StringBuilder().append("META-INF/services/").append(jaxbContextFQCN); |
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325 final InputStream resourceStream = |
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326 classLoader.getResourceAsStream(resource.toString()); |
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327 |
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328 if (resourceStream != null) { |
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329 r = new BufferedReader(new InputStreamReader(resourceStream, "UTF-8")); |
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330 factoryClassName = r.readLine(); |
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331 if (factoryClassName != null) { |
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332 factoryClassName = factoryClassName.trim(); |
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333 } |
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334 r.close(); |
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335 return newInstance(contextPath, factoryClassName, classLoader, properties); |
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336 } else { |
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337 logger.log(Level.FINE, "Unable to load:{0}", resource.toString()); |
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338 } |
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339 } catch (UnsupportedEncodingException e) { |
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340 // should never happen |
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341 throw new JAXBException(e); |
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342 } catch (IOException e) { |
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343 throw new JAXBException(e); |
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344 } finally { |
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345 try { |
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346 if (r != null) { |
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347 r.close(); |
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348 } |
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349 } catch (IOException ex) { |
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350 Logger.getLogger(ContextFinder.class.getName()).log(Level.SEVERE, null, ex); |
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351 } |
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352 } |
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353 |
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354 // else no provider found |
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355 logger.fine("Trying to create the platform default provider"); |
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356 return newInstance(contextPath, PLATFORM_DEFAULT_FACTORY_CLASS, classLoader, properties); |
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357 } |
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358 |
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359 static JAXBContext find( Class[] classes, Map properties ) throws JAXBException { |
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360 |
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361 final String jaxbContextFQCN = JAXBContext.class.getName(); |
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362 String factoryClassName; |
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363 |
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364 // search for jaxb.properties in the class loader of each class first |
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365 for (final Class c : classes) { |
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366 // this classloader is used only to load jaxb.properties, so doing this should be safe. |
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367 ClassLoader classLoader = getClassClassLoader(c); |
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368 Package pkg = c.getPackage(); |
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369 if(pkg==null) |
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370 continue; // this is possible for primitives, arrays, and classes that are loaded by poorly implemented ClassLoaders |
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371 String packageName = pkg.getName().replace('.', '/'); |
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372 |
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373 // TODO: do we want to optimize away searching the same package? org.Foo, org.Bar, com.Baz |
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374 // classes from the same package might come from different class loades, so it might be a bad idea |
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375 |
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376 // TODO: it's easier to look things up from the class |
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377 // c.getResourceAsStream("jaxb.properties"); |
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378 |
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379 // build the resource name and use the property loader code |
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380 String resourceName = packageName+"/jaxb.properties"; |
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381 logger.log(Level.FINE, "Trying to locate {0}", resourceName); |
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382 Properties props = loadJAXBProperties(classLoader, resourceName); |
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383 if (props == null) { |
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384 logger.fine(" not found"); |
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385 } else { |
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386 logger.fine(" found"); |
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387 if (props.containsKey(JAXB_CONTEXT_FACTORY)) { |
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388 // trim() seems redundant, but adding to satisfy customer complaint |
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389 factoryClassName = props.getProperty(JAXB_CONTEXT_FACTORY).trim(); |
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390 return newInstance(classes, properties, factoryClassName); |
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391 } else { |
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392 throw new JAXBException(Messages.format(Messages.MISSING_PROPERTY, packageName, JAXB_CONTEXT_FACTORY)); |
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393 } |
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394 } |
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395 } |
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396 |
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397 // search for a system property second (javax.xml.bind.JAXBContext) |
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398 logger.log(Level.FINE, "Checking system property {0}", JAXBContext.JAXB_CONTEXT_FACTORY); |
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399 factoryClassName = AccessController.doPrivileged(new GetPropertyAction(JAXBContext.JAXB_CONTEXT_FACTORY)); |
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400 if (factoryClassName != null) { |
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401 logger.log(Level.FINE, " found {0}", factoryClassName); |
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402 return newInstance( classes, properties, factoryClassName ); |
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403 } else { // leave it here for compatibility reasons |
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404 logger.fine(" not found"); |
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405 logger.log(Level.FINE, "Checking system property {0}", jaxbContextFQCN); |
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406 factoryClassName = AccessController.doPrivileged(new GetPropertyAction(jaxbContextFQCN)); |
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407 if (factoryClassName != null) { |
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408 logger.log(Level.FINE, " found {0}", factoryClassName); |
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409 return newInstance( classes, properties, factoryClassName ); |
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410 } else { |
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411 logger.fine(" not found"); |
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412 } |
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413 } |
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414 |
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415 // OSGi search |
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416 Class jaxbContext = lookupJaxbContextUsingOsgiServiceLoader(); |
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417 if (jaxbContext != null) { |
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418 logger.fine("OSGi environment detected"); |
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419 return newInstance(classes, properties, jaxbContext); |
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420 } |
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421 |
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422 // search META-INF services next |
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423 logger.fine("Checking META-INF/services"); |
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424 BufferedReader r = null; |
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425 try { |
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426 final String resource = new StringBuilder("META-INF/services/").append(jaxbContextFQCN).toString(); |
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427 ClassLoader classLoader = getContextClassLoader(); |
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428 URL resourceURL; |
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429 if(classLoader==null) |
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430 resourceURL = ClassLoader.getSystemResource(resource); |
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431 else |
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432 resourceURL = classLoader.getResource(resource); |
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433 |
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434 if (resourceURL != null) { |
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435 logger.log(Level.FINE, "Reading {0}", resourceURL); |
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436 r = new BufferedReader(new InputStreamReader(resourceURL.openStream(), "UTF-8")); |
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437 factoryClassName = r.readLine(); |
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438 if (factoryClassName != null) { |
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439 factoryClassName = factoryClassName.trim(); |
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440 } |
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441 return newInstance(classes, properties, factoryClassName); |
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442 } else { |
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443 logger.log(Level.FINE, "Unable to find: {0}", resource); |
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444 } |
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445 } catch (UnsupportedEncodingException e) { |
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446 // should never happen |
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447 throw new JAXBException(e); |
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448 } catch (IOException e) { |
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449 throw new JAXBException(e); |
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450 } finally { |
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451 if (r != null) { |
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452 try { |
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453 r.close(); |
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454 } catch (IOException ex) { |
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455 logger.log(Level.FINE, "Unable to close stream", ex); |
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456 } |
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457 } |
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458 } |
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459 |
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460 // else no provider found |
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461 logger.fine("Trying to create the platform default provider"); |
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462 return newInstance(classes, properties, PLATFORM_DEFAULT_FACTORY_CLASS); |
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463 } |
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464 |
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465 private static Class lookupJaxbContextUsingOsgiServiceLoader() { |
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466 try { |
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467 // Use reflection to avoid having any dependency on ServiceLoader class |
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468 Class target = Class.forName("com.sun.org.glassfish.hk2.osgiresourcelocator.ServiceLoader"); |
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469 Method m = target.getMethod("lookupProviderClasses", Class.class); |
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470 Iterator iter = ((Iterable) m.invoke(null, JAXBContext.class)).iterator(); |
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471 return iter.hasNext() ? (Class)iter.next() : null; |
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472 } catch(Exception e) { |
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473 logger.log(Level.FINE, "Unable to find from OSGi: javax.xml.bind.JAXBContext"); |
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474 return null; |
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475 } |
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476 } |
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477 |
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478 private static Properties loadJAXBProperties( ClassLoader classLoader, |
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479 String propFileName ) |
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480 throws JAXBException { |
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481 |
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482 Properties props = null; |
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483 |
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484 try { |
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485 URL url; |
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486 if(classLoader==null) |
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487 url = ClassLoader.getSystemResource(propFileName); |
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488 else |
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489 url = classLoader.getResource( propFileName ); |
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490 |
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491 if( url != null ) { |
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492 logger.log(Level.FINE, "loading props from {0}", url); |
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493 props = new Properties(); |
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494 InputStream is = url.openStream(); |
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495 props.load( is ); |
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496 is.close(); |
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497 } |
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498 } catch( IOException ioe ) { |
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499 logger.log(Level.FINE,"Unable to load "+propFileName,ioe); |
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500 throw new JAXBException( ioe.toString(), ioe ); |
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501 } |
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502 |
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503 return props; |
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504 } |
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505 |
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506 |
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507 /** |
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508 * Search the given ClassLoader for an instance of the specified class and |
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509 * return a string representation of the URL that points to the resource. |
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510 * |
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511 * @param clazz |
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512 * The class to search for |
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513 * @param loader |
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514 * The ClassLoader to search. If this parameter is null, then the |
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515 * system class loader will be searched |
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516 * @return |
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517 * the URL for the class or null if it wasn't found |
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518 */ |
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519 static URL which(Class clazz, ClassLoader loader) { |
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520 |
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521 String classnameAsResource = clazz.getName().replace('.', '/') + ".class"; |
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522 |
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523 if(loader == null) { |
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524 loader = getSystemClassLoader(); |
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525 } |
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526 |
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527 return loader.getResource(classnameAsResource); |
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528 } |
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529 |
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530 /** |
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531 * Get the URL for the Class from it's ClassLoader. |
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532 * |
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533 * Convenience method for {@link #which(Class, ClassLoader)}. |
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534 * |
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535 * Equivalent to calling: which(clazz, clazz.getClassLoader()) |
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536 * |
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537 * @param clazz |
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538 * The class to search for |
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539 * @return |
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540 * the URL for the class or null if it wasn't found |
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541 */ |
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542 static URL which(Class clazz) { |
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543 return which(clazz, getClassClassLoader(clazz)); |
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544 } |
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545 |
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546 /** |
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547 * When JAXB is in J2SE, rt.jar has to have a JAXB implementation. |
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548 * However, rt.jar cannot have META-INF/services/javax.xml.bind.JAXBContext |
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549 * because if it has, it will take precedence over any file that applications have |
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550 * in their jar files. |
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551 * |
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552 * <p> |
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553 * When the user bundles his own JAXB implementation, we'd like to use it, and we |
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554 * want the platform default to be used only when there's no other JAXB provider. |
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555 * |
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556 * <p> |
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557 * For this reason, we have to hard-code the class name into the API. |
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558 */ |
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559 private static final String PLATFORM_DEFAULT_FACTORY_CLASS = "com.sun.xml.internal.bind.v2.ContextFactory"; |
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560 |
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561 /** |
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562 * Loads the class, provided that the calling thread has an access to the class being loaded. |
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563 */ |
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564 private static Class safeLoadClass(String className, ClassLoader classLoader) throws ClassNotFoundException { |
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565 logger.log(Level.FINE, "Trying to load {0}", className); |
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566 try { |
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567 // make sure that the current thread has an access to the package of the given name. |
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568 SecurityManager s = System.getSecurityManager(); |
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569 if (s != null) { |
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570 int i = className.lastIndexOf('.'); |
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571 if (i != -1) { |
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572 s.checkPackageAccess(className.substring(0,i)); |
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573 } |
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574 } |
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575 |
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576 if (classLoader == null) { |
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577 return Class.forName(className); |
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578 } else { |
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579 return classLoader.loadClass(className); |
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580 } |
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581 } catch (SecurityException se) { |
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582 // anyone can access the platform default factory class without permission |
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583 if (PLATFORM_DEFAULT_FACTORY_CLASS.equals(className)) { |
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584 return Class.forName(className); |
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585 } |
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586 throw se; |
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587 } |
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588 } |
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589 |
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590 private static ClassLoader getContextClassLoader() { |
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591 if (System.getSecurityManager() == null) { |
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592 return Thread.currentThread().getContextClassLoader(); |
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593 } else { |
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594 return (ClassLoader) java.security.AccessController.doPrivileged( |
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595 new java.security.PrivilegedAction() { |
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596 public java.lang.Object run() { |
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597 return Thread.currentThread().getContextClassLoader(); |
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598 } |
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599 }); |
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600 } |
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601 } |
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602 |
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603 private static ClassLoader getClassClassLoader(final Class c) { |
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604 if (System.getSecurityManager() == null) { |
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605 return c.getClassLoader(); |
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606 } else { |
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607 return (ClassLoader) java.security.AccessController.doPrivileged( |
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608 new java.security.PrivilegedAction() { |
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609 public java.lang.Object run() { |
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610 return c.getClassLoader(); |
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611 } |
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612 }); |
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613 } |
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614 } |
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615 |
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616 private static ClassLoader getSystemClassLoader() { |
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617 if (System.getSecurityManager() == null) { |
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618 return ClassLoader.getSystemClassLoader(); |
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619 } else { |
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620 return (ClassLoader) java.security.AccessController.doPrivileged( |
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621 new java.security.PrivilegedAction() { |
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622 public java.lang.Object run() { |
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623 return ClassLoader.getSystemClassLoader(); |
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624 } |
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625 }); |
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626 } |
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627 } |
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628 |
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629 } |