diff -r 011cf7e0a148 -r dc8b7aa7cef3 test/tools/javac/lib/ToolBox.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/tools/javac/lib/ToolBox.java	Tue Feb 19 17:53:16 2013 +0000
@@ -0,0 +1,911 @@
+/*
+ * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.PrintWriter;
+import java.io.StringWriter;
+import java.net.URI;
+import java.nio.charset.Charset;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.StandardOpenOption;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.EnumSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import javax.tools.JavaCompiler;
+import javax.tools.JavaFileObject;
+import javax.tools.SimpleJavaFileObject;
+import javax.tools.ToolProvider;
+
+import com.sun.source.util.JavacTask;
+import com.sun.tools.javac.api.JavacTaskImpl;
+
+import sun.tools.jar.Main;
+
+import static java.nio.file.StandardCopyOption.*;
+
+/**
+ * Toolbox for jtreg tests.
+ */
+
+public class ToolBox {
+
+    public static final String lineSeparator = System.getProperty("line.separator");
+    public static final String jdkUnderTest = System.getProperty("test.jdk");
+    public static final String testVMOpts = System.getProperty("test.tool.vm.opts");
+    public static final String javaBinary = Paths.get(jdkUnderTest, "bin", "java").toString();
+    //why this one private. Because the function which provide also the test options should be used
+    private static final String javacBinary = Paths.get(jdkUnderTest, "bin", "javac").toString();
+
+    private static final Charset defaultCharset = Charset.defaultCharset();
+
+    static final JavaCompiler comp = ToolProvider.getSystemJavaCompiler();
+
+    /**
+     * The expected result of command-like method execution.
+     */
+    public enum Expect {SUCCESS, FAIL}
+
+    enum AcceptedParams {
+        EXPECT,
+        SOURCES,
+        OPTIONS,
+        STD_OUTPUT,
+        ERR_OUTPUT,
+        EXTRA_ENV,
+    }
+
+    enum OutputKind {STD, ERR}
+
+    /**
+     * Helper class to abstract the processing of command's output.
+     */
+    static abstract class WriterHelper {
+        OutputKind kind;
+        public abstract void pipeOutput(ProcessBuilder pb);
+        public abstract void readFromStream(Process p) throws IOException;
+        public abstract void addAll(Collection<? extends String> c) throws IOException;
+    }
+
+    /**
+     * Helper class for redirecting command's output to a file.
+     */
+    static class FileWriterHelper extends WriterHelper {
+        File file;
+
+        FileWriterHelper(File file, OutputKind kind) {
+            this.file = file;
+            this.kind = kind;
+        }
+
+        @Override
+        public void pipeOutput(ProcessBuilder pb) {
+            if (file != null) {
+                switch (kind) {
+                    case STD:
+                        pb.redirectInput(file);
+                        break;
+                    case ERR:
+                        pb.redirectError(file);
+                        break;
+                }
+            }
+        }
+
+        @Override
+        public void readFromStream(Process p) throws IOException {}
+
+        @Override
+        public void addAll(Collection<? extends String> c) throws IOException {
+            if (file.exists())
+                Files.write(file.toPath(), c, defaultCharset,
+                        StandardOpenOption.WRITE, StandardOpenOption.APPEND);
+            else
+                Files.write(file.toPath(), c, defaultCharset);
+        }
+    }
+
+    /**
+     * Helper class for redirecting command's output to a String list.
+     */
+    static class ListWriterHelper extends WriterHelper {
+        List<String> list;
+
+        public ListWriterHelper(List<String> list, OutputKind kind) {
+            this.kind = kind;
+            this.list = list;
+        }
+
+        @Override
+        public void pipeOutput(ProcessBuilder pb) {}
+
+        @Override
+        public void readFromStream(Process p) throws IOException {
+            BufferedReader br = null;
+            switch (kind) {
+                case STD:
+                    br = new BufferedReader(new InputStreamReader(p.getInputStream()));
+                    break;
+                case ERR:
+                    br = new BufferedReader(new InputStreamReader(p.getErrorStream()));
+                    break;
+            }
+            String line;
+            while ((line = br.readLine()) != null) {
+                list.add(line);
+            }
+        }
+
+        public void addAll(Collection<? extends String> c) {
+            list.addAll(c);
+        }
+    }
+
+    /**
+     * Simple factory class for creating a WriterHelper instance.
+     */
+    static class WriterHelperFactory {
+        static WriterHelper make(File file, OutputKind kind) {
+            return new FileWriterHelper(file, kind);
+        }
+
+        static WriterHelper make(List<String> list, OutputKind kind) {
+            return new ListWriterHelper(list, kind);
+        }
+    }
+
+    /**
+     * A generic class for holding command's arguments.
+     */
+    public static abstract class GenericArgs <T extends GenericArgs> {
+        protected static List<Set<AcceptedParams>> minAcceptedParams;
+
+        protected Set<AcceptedParams> currentParams =
+                EnumSet.<AcceptedParams>noneOf(AcceptedParams.class);
+
+        protected Expect whatToExpect;
+        protected WriterHelper stdOutput;
+        protected WriterHelper errOutput;
+        protected List<String> options;
+        protected String[] optionsArr;
+
+        protected GenericArgs() {
+            set(Expect.SUCCESS);
+        }
+
+        public T set(Expect whatToExpt) {
+            currentParams.add(AcceptedParams.EXPECT);
+            this.whatToExpect = whatToExpt;
+            return (T)this;
+        }
+
+        public T setStdOutput(List<String> stdOutput) {
+            currentParams.add(AcceptedParams.STD_OUTPUT);
+            this.stdOutput = WriterHelperFactory.make(stdOutput, OutputKind.STD);
+            return (T)this;
+        }
+
+        public T setStdOutput(File output) {
+            currentParams.add(AcceptedParams.STD_OUTPUT);
+            this.stdOutput = WriterHelperFactory.make(output, OutputKind.STD);
+            return (T)this;
+        }
+
+        public T setErrOutput(List<String> errOutput) {
+            currentParams.add(AcceptedParams.ERR_OUTPUT);
+            this.errOutput = WriterHelperFactory.make(errOutput, OutputKind.ERR);
+            return (T)this;
+        }
+
+        public T setErrOutput(File errOutput) {
+            currentParams.add(AcceptedParams.ERR_OUTPUT);
+            this.errOutput = WriterHelperFactory.make(errOutput, OutputKind.ERR);
+            return (T)this;
+        }
+
+        public T setAllArgs(String... args) {
+            currentParams.add(AcceptedParams.OPTIONS);
+            this.optionsArr = args;
+            return (T)this;
+        }
+
+        public T setOptions(List<String> options) {
+            currentParams.add(AcceptedParams.OPTIONS);
+            this.options = options;
+            return (T)this;
+        }
+
+        public T setOptions(String... options) {
+            currentParams.add(AcceptedParams.OPTIONS);
+            this.options = Arrays.asList(options);
+            return (T)this;
+        }
+
+        public boolean hasMinParams() {
+            for (Set<AcceptedParams> minSet : minAcceptedParams) {
+                if (currentParams.containsAll(minSet)) {
+                    return true;
+                }
+            }
+            return false;
+        }
+    }
+
+    /**
+     * A more specific class for holding javac-like command's arguments.
+     */
+    public static class JavaToolArgs extends GenericArgs<JavaToolArgs> {
+
+        static {
+            minAcceptedParams = new ArrayList<>();
+            minAcceptedParams.add(EnumSet.<AcceptedParams>of(
+                    AcceptedParams.EXPECT, AcceptedParams.OPTIONS));
+            minAcceptedParams.add(EnumSet.<AcceptedParams>of(
+                    AcceptedParams.EXPECT, AcceptedParams.SOURCES));
+        }
+
+        protected List<? extends JavaFileObject> sources;
+
+        public JavaToolArgs() {
+            super();
+        }
+
+        public JavaToolArgs(Expect whatToExpt) {
+            super.set(whatToExpt);
+        }
+
+        public JavaToolArgs setSources(List<? extends JavaFileObject> sources) {
+            currentParams.add(AcceptedParams.SOURCES);
+            this.sources = sources;
+            return this;
+        }
+
+        public JavaToolArgs setSources(JavaSource... sources) {
+            return setSources(Arrays.asList(sources));
+        }
+
+        public JavaToolArgs setSources(String... sources) {
+            List<JavaSource> javaSrcs = new ArrayList<>();
+            for (String source : sources) {
+                javaSrcs.add(new JavaSource(source));
+            }
+            return setSources(javaSrcs);
+        }
+    }
+
+    /**
+     * A more specific class for holding any command's arguments.
+     */
+    public static class AnyToolArgs extends GenericArgs<AnyToolArgs> {
+
+        static {
+            minAcceptedParams = new ArrayList<>();
+            minAcceptedParams.add(EnumSet.<AcceptedParams>of(
+                    AcceptedParams.EXPECT, AcceptedParams.OPTIONS));
+        }
+
+        Map<String, String> extraEnv;
+
+        public AnyToolArgs() {
+            super();
+        }
+
+        public AnyToolArgs(Expect whatToExpt) {
+            set(whatToExpt);
+        }
+
+        public AnyToolArgs set(Map<String, String> extraEnv) {
+            currentParams.add(AcceptedParams.EXTRA_ENV);
+            this.extraEnv = extraEnv;
+            return this;
+        }
+    }
+
+    /**
+     * Custom exception for bad command execution.
+     */
+    public static class CommandExecutionException extends Exception {
+        CommandExecutionException(List<String> command, Expect whatToExpt) {
+            super(createMessage(command, whatToExpt));
+        }
+
+        CommandExecutionException(Expect whatToExpt, String... command) {
+            this(Arrays.asList(command), whatToExpt);
+        }
+
+        private static String createMessage(List<String> command, Expect whatToExpt) {
+            StringBuilder sb = new StringBuilder().append("Command : ");
+            sb.append(command.toString()).append(lineSeparator);
+            switch (whatToExpt) {
+                case SUCCESS:
+                    sb.append("    has unexpectedly failed");
+                    break;
+                case FAIL:
+                    sb.append("    has been unexpectedly successful");
+                    break;
+            }
+            return sb.toString();
+        }
+    }
+
+    /**
+     * Custom exception for not equal resources.
+     */
+    public static class ResourcesNotEqualException extends Exception {
+        public ResourcesNotEqualException() {
+            super("The resources provided for comparison are different");
+        }
+
+        public ResourcesNotEqualException(Path path1, Path path2) {
+            super(createMessage(path1, path2));
+        }
+
+        private static String createMessage(Path path1, Path path2) {
+            return new StringBuilder()
+                    .append("The resources provided for comparison in paths \n")
+                    .append(path1.toString()).append(" and \n")
+                    .append(path2.toString()).append("are different").toString();
+        }
+    }
+
+    /**
+     * Method to get the a path to the javac command available at the jdk being
+     * tested along with the test vm options.
+     * @return a String[] with the two components mentioned.
+     */
+    public static String[] getJavacBin() {
+        return new String[]{javacBinary, testVMOpts};
+    }
+
+    /**
+     * A javac compiler caller method.
+     */
+    public static int javac(JavaToolArgs params)
+            throws CommandExecutionException, IOException {
+        if (params.hasMinParams()) {
+            if (params.optionsArr != null) {
+                return genericJavaCMD(JavaCMD.JAVAC, params);
+            } else {
+                return genericJavaCMD(JavaCMD.JAVAC_API, params);
+            }
+        }
+        throw new AssertionError("javac command has been invoked with less parameters than needed");
+    }
+
+    /**
+     * A javap calling method.
+     */
+    public static String javap(JavaToolArgs params)
+            throws CommandExecutionException, IOException {
+        if (params.hasMinParams()) {
+            List<String> list = new ArrayList<>();
+            params.setErrOutput(list);
+            genericJavaCMD(JavaCMD.JAVAP, params);
+            return listToString(list);
+        }
+        throw new AssertionError("javap command has been invoked with less parameters than needed");
+    }
+
+    /**
+     * A javah calling method.
+     */
+    public static int javah(JavaToolArgs params)
+            throws CommandExecutionException, IOException {
+        if (params.hasMinParams()) {
+            return genericJavaCMD(JavaCMD.JAVAH, params);
+        }
+        throw new AssertionError("javah command has been invoked with less parameters than needed");
+    }
+
+    /**
+     * A enum class for langtools commands.
+     */
+    enum JavaCMD {
+        JAVAC {
+            @Override
+            int run(JavaToolArgs params, PrintWriter pw) {
+                return com.sun.tools.javac.Main.compile(params.optionsArr, pw);
+            }
+        },
+        JAVAC_API {
+            @Override
+            int run(JavaToolArgs params, PrintWriter pw) {
+                JavacTask ct = (JavacTask)comp.getTask(pw, null, null,
+                        params.options, null, params.sources);
+                return ((JavacTaskImpl)ct).doCall().exitCode;
+            }
+
+            @Override
+            String getName() {
+                return "javac";
+            }
+
+            @Override
+            List<String> getExceptionMsgContent(JavaToolArgs params) {
+                List<String> result = super.getExceptionMsgContent(params);
+                for (JavaFileObject source : params.sources) {
+                    if (source instanceof JavaSource) {
+                        result.add(((JavaSource)source).name);
+                    }
+                }
+                return result;
+            }
+        },
+        JAVAH {
+            @Override
+            int run(JavaToolArgs params, PrintWriter pw) {
+                return com.sun.tools.javah.Main.run(params.optionsArr, pw);
+            }
+        },
+        JAVAP {
+            @Override
+            int run(JavaToolArgs params, PrintWriter pw) {
+                return com.sun.tools.javap.Main.run(params.optionsArr, pw);
+            }
+        };
+
+        abstract int run(JavaToolArgs params, PrintWriter pw);
+
+        String getName() {
+            return this.name().toLowerCase();
+        }
+
+        List<String> getExceptionMsgContent(JavaToolArgs params) {
+            List<String> result = new ArrayList<>();
+            result.add(getName());
+            result.addAll(params.optionsArr != null ?
+                    Arrays.asList(params.optionsArr) :
+                    params.options);
+            return result;
+        }
+    }
+
+    /**
+     * A helper method for executing langtools commands.
+     */
+    private static int genericJavaCMD(
+            JavaCMD cmd,
+            JavaToolArgs params)
+            throws CommandExecutionException, IOException {
+        int rc = 0;
+        StringWriter sw = null;
+        try (PrintWriter pw = (params.errOutput == null) ?
+                null : new PrintWriter(sw = new StringWriter())) {
+            rc = cmd.run(params, pw);
+        }
+        String out = (sw == null) ? null : sw.toString();
+
+        if (params.errOutput != null && (out != null) && !out.isEmpty()) {
+            params.errOutput.addAll(splitLines(out));
+        }
+
+        if ( (rc == 0 && params.whatToExpect == Expect.SUCCESS) ||
+             (rc != 0 && params.whatToExpect == Expect.FAIL) ) {
+            return rc;
+        }
+
+        throw new CommandExecutionException(cmd.getExceptionMsgContent(params),
+                params.whatToExpect);
+    }
+
+    /**
+     * A jar calling method.
+     */
+    public static boolean jar(String... params) throws CommandExecutionException {
+        Main jarGenerator = new Main(System.out, System.err, "jar");
+        boolean result = jarGenerator.run(params);
+        if (!result) {
+            List<String> command = new ArrayList<>();
+            command.add("jar");
+            command.addAll(Arrays.asList(params));
+            throw new CommandExecutionException(command, Expect.SUCCESS);
+        }
+        return result;
+    }
+
+    /**
+     * A general command calling method.
+     */
+    public static int executeCommand(AnyToolArgs params)
+            throws CommandExecutionException, IOException, InterruptedException {
+        if (params.hasMinParams()) {
+            List<String> cmd = (params.options != null) ?
+                    params.options :
+                    Arrays.asList(params.optionsArr);
+            return executeCommand(cmd, params.extraEnv, params.stdOutput,
+                    params.errOutput, params.whatToExpect);
+        }
+        throw new AssertionError("command has been invoked with less parameters than needed");
+    }
+
+    /**
+     * A helper method for calling a general command.
+     */
+    private static int executeCommand(
+            List<String> command,
+            Map<String, String> extraEnv,
+            WriterHelper stdOutput,
+            WriterHelper errOutput,
+            Expect whatToExpt)
+            throws IOException, InterruptedException, CommandExecutionException {
+        ProcessBuilder pb = new ProcessBuilder(command);
+
+        if (stdOutput != null) stdOutput.pipeOutput(pb);
+        if (errOutput != null) errOutput.pipeOutput(pb);
+
+        if (extraEnv != null) {
+            pb.environment().putAll(extraEnv);
+        }
+
+        Process p = pb.start();
+
+        if (stdOutput != null) stdOutput.readFromStream(p);
+        if (errOutput != null) errOutput.readFromStream(p);
+
+        int result = p.waitFor();
+        if ( (result == 0 && whatToExpt == Expect.SUCCESS) ||
+             (result != 0 && whatToExpt == Expect.FAIL) ) {
+            return result;
+        }
+
+        throw new CommandExecutionException(command, whatToExpt);
+    }
+
+    /**
+     * This set of methods can be used instead of diff when the only needed
+     * result is the equality or inequality of the two given resources.
+     *
+     * A resource can be a file or a String list.
+     */
+    public static void compareLines(Path aPath, Path otherPath, String encoding)
+            throws FileNotFoundException, IOException, ResourcesNotEqualException {
+        compareLines(aPath, otherPath, encoding, false);
+    }
+
+    public static void compareLines(
+            Path aPath, Path otherPath, String encoding, boolean trim)
+            throws FileNotFoundException, IOException, ResourcesNotEqualException {
+        Charset charset = encoding != null ?
+                Charset.forName(encoding) :
+                defaultCharset;
+        List<String> list1 = Files.readAllLines(aPath, charset);
+        List<String> list2 = Files.readAllLines(otherPath, charset);
+        compareLines(list1, list2, trim);
+    }
+
+    public static void compareLines(Path path, List<String> strings, String encoding)
+            throws FileNotFoundException, IOException, ResourcesNotEqualException {
+        compareLines(path, strings, encoding, false);
+    }
+
+    public static void compareLines(Path path, List<String> strings,
+            String encoding, boolean trim)
+            throws FileNotFoundException, IOException, ResourcesNotEqualException {
+        Charset charset = encoding != null ?
+                Charset.forName(encoding) :
+                defaultCharset;
+        List<String> list = Files.readAllLines(path, charset);
+        compareLines(list, strings, trim);
+    }
+
+    public static void compareLines(List<String> list1, List<String> list2)
+            throws ResourcesNotEqualException {
+        compareLines(list1, list2, false);
+    }
+
+    public static void compareLines(List<String> list1,
+            List<String> list2, boolean trim) throws ResourcesNotEqualException {
+        if ((list1 == list2) || (list1 == null && list2 == null)) return;
+        if (list1.size() != list2.size())
+            throw new ResourcesNotEqualException();
+        int i = 0;
+        int j = 0;
+        while (i < list1.size() &&
+               j < list2.size() &&
+               equals(list1.get(i), list2.get(j), trim)) {
+            i++; j++;
+        }
+        if (!(i == list1.size() && j == list2.size()))
+            throw new ResourcesNotEqualException();
+    }
+
+    private static boolean equals(String s1, String s2, boolean trim) {
+        return (trim ? s1.trim().equals(s2.trim()) : s1.equals(s2));
+    }
+
+    /**
+     * A set of simple grep-like methods, looks for regExpr in text.
+     * The content of text is split using the new line character as a pattern
+     * and later the regExpr is seek in every split line. If a match is found,
+     * the whole line is added to the result.
+     */
+    public static List<String> grep(String regExpr, String text) {
+        return grep(regExpr, splitLines(text));
+    }
+
+    public static List<String> grep(String regExpr, List<String> text) {
+        List<String> result = new ArrayList<>();
+        Pattern pattern = Pattern.compile(regExpr);
+        for (String s : text) {
+            if (pattern.matcher(s).find()) {
+                result.add(s);
+            }
+        }
+        return result;
+    }
+
+    public static List<String> grep(String regExpr, File f)
+            throws IOException {
+        List<String> lines = Files.readAllLines(f.toPath(), defaultCharset);
+        return grep(regExpr, lines);
+    }
+
+    /**
+     * A touch-like method.
+     */
+    public static boolean touch(String fileName) {
+        File file = new File(fileName);
+        return touch(file);
+    }
+
+    public static boolean touch(File file) {
+        if (file.exists()) {
+            file.setLastModified(System.currentTimeMillis());
+            return true;
+        }
+        return false;
+    }
+
+    public static void createJavaFile(File outFile) throws IOException {
+        createJavaFile(outFile, null);
+    }
+
+    /**
+     * A method for creating a valid but very simple java file.
+     */
+    public static void createJavaFile(File outFile, File superClass)
+            throws IOException {
+        String srcStr = "public class " + getSimpleName(outFile) + " ";
+        if (superClass != null) {
+            srcStr = srcStr.concat("extends " + getSimpleName(superClass) + " ");
+        }
+        srcStr = srcStr.concat("{}");
+        try (PrintWriter ps = new PrintWriter(new FileWriter(outFile))) {
+            ps.println(srcStr);
+        }
+    }
+
+    /**
+     * Creates a java file name given its source.
+     * The file is created in the working directory, creating a directory
+     * tree if there is a package declaration.
+     */
+    public static void createJavaFileFromSource(String source) throws IOException {
+        createJavaFileFromSource(null, source);
+    }
+
+    /**
+     * Creates a java file name given its source.
+     * The file is created in the working directory, creating a directory
+     * tree if there is a package declaration or the argument initialPath
+     * has a valid path.
+     *
+     * e.i. if initialPath is foo/ and the source is:
+     * package bar;
+     *
+     * public class bazz {}
+     *
+     * this method will create the file foo/bar/bazz.java in the working
+     * directory.
+     */
+    public static void createJavaFileFromSource(Path initialPath,
+            String source) throws IOException {
+        String fileName = getJavaFileNameFromSource(source);
+        String dirTree = getDirTreeFromSource(source);
+        Path path = (dirTree != null) ?
+                Paths.get(dirTree, fileName) :
+                Paths.get(fileName);
+        path = (initialPath != null) ?
+                initialPath.resolve(path):
+                path;
+        writeFile(path, source);
+    }
+
+    static Pattern publicClassPattern =
+            Pattern.compile("public\\s+(?:class|enum|interface){1}\\s+(\\w+)");
+    static Pattern packageClassPattern =
+            Pattern.compile("(?:class|enum|interface){1}\\s+(\\w+)");
+
+    /**
+     * Extracts the java file name from the class declaration.
+     * This method is intended for simple files and uses regular expressions,
+     * so comments matching the pattern can make the method fail.
+     */
+    private static String getJavaFileNameFromSource(String source) {
+        String className = null;
+        Matcher matcher = publicClassPattern.matcher(source);
+        if (matcher.find()) {
+            className = matcher.group(1) + ".java";
+        } else {
+            matcher = packageClassPattern.matcher(source);
+            if (matcher.find()) {
+                className = matcher.group(1) + ".java";
+            } else {
+                throw new AssertionError("Could not extract the java class " +
+                        "name from the provided source");
+            }
+        }
+        return className;
+    }
+
+    static Pattern packagePattern =
+            Pattern.compile("package\\s+(((?:\\w+\\.)*)(?:\\w+))");
+
+    /**
+     * Extracts the path from the package declaration if present.
+     * This method is intended for simple files and uses regular expressions,
+     * so comments matching the pattern can make the method fail.
+     */
+    private static String getDirTreeFromSource(String source) {
+        Matcher matcher = packagePattern.matcher(source);
+        return matcher.find() ?
+            matcher.group(1).replace(".", File.separator) :
+            null;
+    }
+
+    /**
+     * A method for creating a jar's manifest file with supplied data.
+     */
+    public static void mkManifestWithClassPath(String mainClass,
+            String... classes) throws IOException {
+        List <String> lines = new ArrayList<>();
+
+        StringBuilder sb = new StringBuilder("Class-Path: ".length() +
+                classes[0].length()).append("Class-Path: ").append(classes[0]);
+        for (int i = 1; i < classes.length; i++) {
+            sb.append(" ").append(classes[i]);
+        }
+        lines.add(sb.toString());
+        if (mainClass != null) {
+            lines.add(new StringBuilder("Main-Class: ".length() +
+                      mainClass.length())
+                      .append("Main-Class: ")
+                      .append(mainClass).toString());
+        }
+        Files.write(Paths.get("MANIFEST.MF"), lines, null);
+    }
+
+    /**
+     * A utility method to obtain the file name.
+     */
+    static String getSimpleName(File inFile) {
+        return inFile.toPath().getFileName().toString();
+    }
+
+    /**
+     * A method to write to a file, the directory tree is created if needed.
+     */
+    public static File writeFile(Path path, String body) throws IOException {
+        File result;
+        if (path.getParent() != null) {
+            Files.createDirectories(path.getParent());
+        }
+        try (FileWriter out = new FileWriter(result = path.toAbsolutePath().toFile())) {
+            out.write(body);
+        }
+        return result;
+    }
+
+    public static File writeFile(String path, String body) throws IOException {
+        return writeFile(Paths.get(path), body);
+    }
+
+    /**
+     * A rm-like method, the file is deleted only if it exists.
+     */
+    public static void rm(Path path) throws Exception {
+        Files.deleteIfExists(path);
+    }
+
+    public static void rm(String filename) throws Exception {
+        rm(Paths.get(filename));
+    }
+
+    public static void rm(File f) throws Exception {
+        rm(f.toPath());
+    }
+
+    /**
+     * Copy source file to destination file.
+     */
+    public static void copyFile(File destfile, File srcfile)
+        throws IOException {
+        copyFile(destfile.toPath(), srcfile.toPath());
+    }
+
+    public static void copyFile(Path destPath, Path srcPath)
+        throws IOException {
+        Files.createDirectories(destPath);
+        Files.copy(srcPath, destPath, REPLACE_EXISTING);
+    }
+
+    /**
+     * Splits a String using the System's line separator character as splitting point.
+     */
+    public static List<String> splitLines(String lines) {
+        return Arrays.asList(lines.split(lineSeparator));
+    }
+
+    /**
+     * Converts a String list into one String by appending the System's line separator
+     * character after each component.
+     */
+    private static String listToString(List<String> lines) {
+        StringBuilder sb = new StringBuilder();
+        for (String s : lines) {
+            sb.append(s).append(lineSeparator);
+        }
+        return sb.toString();
+    }
+
+    /**
+     * Class representing an in-memory java source file. It is able to extract
+     * the file name from simple source codes using regular expressions.
+     */
+    public static class JavaSource extends SimpleJavaFileObject {
+        String source;
+        String name;
+
+        public JavaSource(String className, String source) {
+            super(URI.create(className),
+                    JavaFileObject.Kind.SOURCE);
+            this.name = className;
+            this.source = source;
+        }
+
+        public JavaSource(String source) {
+            super(URI.create(getJavaFileNameFromSource(source)),
+                    JavaFileObject.Kind.SOURCE);
+            this.name = getJavaFileNameFromSource(source);
+            this.source = source;
+        }
+
+        @Override
+        public CharSequence getCharContent(boolean ignoreEncodingErrors) {
+            return source;
+        }
+    }
+}