8044364: runtime/RedefineFinalizer test fails on windows

Mon, 02 Jun 2014 19:08:18 +0200

author
ctornqvi
date
Mon, 02 Jun 2014 19:08:18 +0200
changeset 8050
3e5e398431a8
parent 8049
c2c7fed86a5e
child 8051
9baa8031bac1

8044364: runtime/RedefineFinalizer test fails on windows
Summary: Rewrote the test in pure Java, added RedefineClassHelper utility class
Reviewed-by: coleenp, allwin, gtriantafill, dsamersoff

test/runtime/RedefineFinalizer/Agent.java file | annotate | diff | comparison | revisions
test/runtime/RedefineFinalizer/Main.java file | annotate | diff | comparison | revisions
test/runtime/RedefineFinalizer/Martyr.java file | annotate | diff | comparison | revisions
test/runtime/RedefineFinalizer/MartyrSon.java file | annotate | diff | comparison | revisions
test/runtime/RedefineFinalizer/RedefineFinalizer.java file | annotate | diff | comparison | revisions
test/runtime/RedefineFinalizer/manifest.mf file | annotate | diff | comparison | revisions
test/runtime/RedefineFinalizer/testme.sh file | annotate | diff | comparison | revisions
test/testlibrary/RedefineClassHelper.java file | annotate | diff | comparison | revisions
test/testlibrary_tests/RedefineClassTest.java file | annotate | diff | comparison | revisions
     1.1 --- a/test/runtime/RedefineFinalizer/Agent.java	Wed May 28 07:36:32 2014 -0700
     1.2 +++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.3 @@ -1,94 +0,0 @@
     1.4 -/*
     1.5 - * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
     1.6 - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
     1.7 - *
     1.8 - * This code is free software; you can redistribute it and/or modify it
     1.9 - * under the terms of the GNU General Public License version 2 only, as
    1.10 - * published by the Free Software Foundation.
    1.11 - *
    1.12 - * This code is distributed in the hope that it will be useful, but WITHOUT
    1.13 - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    1.14 - * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    1.15 - * version 2 for more details (a copy is included in the LICENSE file that
    1.16 - * accompanied this code).
    1.17 - *
    1.18 - * You should have received a copy of the GNU General Public License version
    1.19 - * 2 along with this work; if not, write to the Free Software Foundation,
    1.20 - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
    1.21 - *
    1.22 - * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
    1.23 - * or visit www.oracle.com if you need additional information or have any
    1.24 - * questions.
    1.25 - */
    1.26 -
    1.27 -import java.lang.instrument.Instrumentation;
    1.28 -import java.lang.instrument.ClassDefinition;
    1.29 -
    1.30 -import jdk.internal.org.objectweb.asm.ClassWriter;
    1.31 -import jdk.internal.org.objectweb.asm.Label;
    1.32 -import jdk.internal.org.objectweb.asm.MethodVisitor;
    1.33 -import jdk.internal.org.objectweb.asm.Opcodes;
    1.34 -
    1.35 -public class Agent implements Opcodes {
    1.36 -
    1.37 -    private static byte[] makeNewMartyr() {
    1.38 -        ClassWriter cw = new ClassWriter(0);
    1.39 -        MethodVisitor mv;
    1.40 -
    1.41 -        cw.visit(V1_8, ACC_PUBLIC + ACC_SUPER, "Martyr", null, "java/lang/Object", null);
    1.42 -        cw.visitSource(null, null);
    1.43 -
    1.44 -        {
    1.45 -            mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
    1.46 -            mv.visitCode();
    1.47 -            Label lab0 = new Label();
    1.48 -            mv.visitLabel(lab0);
    1.49 -            mv.visitLineNumber(1, lab0);
    1.50 -            mv.visitVarInsn(ALOAD, 0);
    1.51 -            mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
    1.52 -            mv.visitInsn(RETURN);
    1.53 -            mv.visitMaxs(1, 1);
    1.54 -            mv.visitEnd();
    1.55 -        }
    1.56 -
    1.57 -        {
    1.58 -            mv = cw.visitMethod(ACC_PUBLIC, "getName", "()Ljava/lang/String;", null, null);
    1.59 -            mv.visitCode();
    1.60 -            Label lab0 = new Label();
    1.61 -            mv.visitLabel(lab0);
    1.62 -            mv.visitLineNumber(6, lab0);
    1.63 -            mv.visitLdcInsn("Redefinition done");
    1.64 -            mv.visitInsn(ARETURN);
    1.65 -            mv.visitMaxs(1, 1);
    1.66 -            mv.visitEnd();
    1.67 -        }
    1.68 -
    1.69 -        {
    1.70 -            mv = cw.visitMethod(ACC_PROTECTED, "finalize", "()V", null, null);
    1.71 -            mv.visitCode();
    1.72 -            Label lab0 = new Label();
    1.73 -            mv.visitLabel(lab0);
    1.74 -            mv.visitLineNumber(8, lab0);
    1.75 -            mv.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
    1.76 -            mv.visitLdcInsn("Finalizer called");
    1.77 -            mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V");
    1.78 -            mv.visitInsn(RETURN);
    1.79 -            mv.visitMaxs(2, 1);
    1.80 -            mv.visitEnd();
    1.81 -        }
    1.82 -
    1.83 -        cw.visitEnd();
    1.84 -        return cw.toByteArray();
    1.85 -    }
    1.86 -
    1.87 -
    1.88 -    public static void premain(String args, Instrumentation inst) throws Exception {
    1.89 -        agentmain(args, inst);
    1.90 -    }
    1.91 -
    1.92 -    public static void agentmain(String args, Instrumentation inst) throws Exception {
    1.93 -        ClassDefinition martyrDef =
    1.94 -              new ClassDefinition(Class.forName("Martyr"), makeNewMartyr());
    1.95 -        inst.redefineClasses(martyrDef);
    1.96 -    }
    1.97 -}
     2.1 --- a/test/runtime/RedefineFinalizer/Main.java	Wed May 28 07:36:32 2014 -0700
     2.2 +++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
     2.3 @@ -1,34 +0,0 @@
     2.4 -/*
     2.5 - * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
     2.6 - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
     2.7 - *
     2.8 - * This code is free software; you can redistribute it and/or modify it
     2.9 - * under the terms of the GNU General Public License version 2 only, as
    2.10 - * published by the Free Software Foundation.
    2.11 - *
    2.12 - * This code is distributed in the hope that it will be useful, but WITHOUT
    2.13 - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    2.14 - * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    2.15 - * version 2 for more details (a copy is included in the LICENSE file that
    2.16 - * accompanied this code).
    2.17 - *
    2.18 - * You should have received a copy of the GNU General Public License version
    2.19 - * 2 along with this work; if not, write to the Free Software Foundation,
    2.20 - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
    2.21 - *
    2.22 - * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
    2.23 - * or visit www.oracle.com if you need additional information or have any
    2.24 - * questions.
    2.25 - */
    2.26 -
    2.27 -public class Main {
    2.28 -    public static void main(String[] args) {
    2.29 -      try {
    2.30 -          MartyrSon m = new MartyrSon();
    2.31 -          System.out.println(m.getName());
    2.32 -          System.runFinalization();
    2.33 -      } catch (Throwable e) {
    2.34 -          e.printStackTrace();
    2.35 -      }
    2.36 -    }
    2.37 -}
     3.1 --- a/test/runtime/RedefineFinalizer/Martyr.java	Wed May 28 07:36:32 2014 -0700
     3.2 +++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
     3.3 @@ -1,33 +0,0 @@
     3.4 -/*
     3.5 - * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
     3.6 - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
     3.7 - *
     3.8 - * This code is free software; you can redistribute it and/or modify it
     3.9 - * under the terms of the GNU General Public License version 2 only, as
    3.10 - * published by the Free Software Foundation.
    3.11 - *
    3.12 - * This code is distributed in the hope that it will be useful, but WITHOUT
    3.13 - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    3.14 - * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    3.15 - * version 2 for more details (a copy is included in the LICENSE file that
    3.16 - * accompanied this code).
    3.17 - *
    3.18 - * You should have received a copy of the GNU General Public License version
    3.19 - * 2 along with this work; if not, write to the Free Software Foundation,
    3.20 - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
    3.21 - *
    3.22 - * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
    3.23 - * or visit www.oracle.com if you need additional information or have any
    3.24 - * questions.
    3.25 - */
    3.26 -
    3.27 -public class Martyr {
    3.28 -    public String getName() {
    3.29 -        return "Redefinition NOT done";
    3.30 -    }
    3.31 -
    3.32 -    protected void finalize() {
    3.33 -      // should be empty
    3.34 -    }
    3.35 -
    3.36 -}
     4.1 --- a/test/runtime/RedefineFinalizer/MartyrSon.java	Wed May 28 07:36:32 2014 -0700
     4.2 +++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
     4.3 @@ -1,28 +0,0 @@
     4.4 -/*
     4.5 - * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
     4.6 - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
     4.7 - *
     4.8 - * This code is free software; you can redistribute it and/or modify it
     4.9 - * under the terms of the GNU General Public License version 2 only, as
    4.10 - * published by the Free Software Foundation.
    4.11 - *
    4.12 - * This code is distributed in the hope that it will be useful, but WITHOUT
    4.13 - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    4.14 - * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    4.15 - * version 2 for more details (a copy is included in the LICENSE file that
    4.16 - * accompanied this code).
    4.17 - *
    4.18 - * You should have received a copy of the GNU General Public License version
    4.19 - * 2 along with this work; if not, write to the Free Software Foundation,
    4.20 - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
    4.21 - *
    4.22 - * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
    4.23 - * or visit www.oracle.com if you need additional information or have any
    4.24 - * questions.
    4.25 - */
    4.26 -
    4.27 -class MartyrSon extends Martyr {
    4.28 -    public String getName() {
    4.29 -      return super.getName();
    4.30 -    }
    4.31 -}
     5.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     5.2 +++ b/test/runtime/RedefineFinalizer/RedefineFinalizer.java	Mon Jun 02 19:08:18 2014 +0200
     5.3 @@ -0,0 +1,64 @@
     5.4 +/*
     5.5 + * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
     5.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
     5.7 + *
     5.8 + * This code is free software; you can redistribute it and/or modify it
     5.9 + * under the terms of the GNU General Public License version 2 only, as
    5.10 + * published by the Free Software Foundation.
    5.11 + *
    5.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
    5.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    5.14 + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    5.15 + * version 2 for more details (a copy is included in the LICENSE file that
    5.16 + * accompanied this code).
    5.17 + *
    5.18 + * You should have received a copy of the GNU General Public License version
    5.19 + * 2 along with this work; if not, write to the Free Software Foundation,
    5.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
    5.21 + *
    5.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
    5.23 + * or visit www.oracle.com if you need additional information or have any
    5.24 + * questions.
    5.25 + */
    5.26 +
    5.27 +/*
    5.28 + * @test
    5.29 + * @bug 6904403
    5.30 + * @summary Don't assert if we redefine finalize method
    5.31 + * @library /testlibrary
    5.32 + * @build RedefineClassHelper
    5.33 + * @run main RedefineClassHelper
    5.34 + * @run main/othervm -javaagent:redefineagent.jar RedefineFinalizer
    5.35 + */
    5.36 +
    5.37 +/*
    5.38 + * Regression test for hitting:
    5.39 + *
    5.40 + * assert(f == k->has_finalizer()) failed: inconsistent has_finalizer
    5.41 + *
    5.42 + * when redefining finalizer method
    5.43 + */
    5.44 +public class RedefineFinalizer {
    5.45 +
    5.46 +    public static String newB =
    5.47 +                "class RedefineFinalizer$B {" +
    5.48 +                "   protected void finalize() { " +
    5.49 +                "       System.out.println(\"Finalizer called\");" +
    5.50 +                "   }" +
    5.51 +                "}";
    5.52 +
    5.53 +    public static void main(String[] args) throws Exception {
    5.54 +        RedefineClassHelper.redefineClass(B.class, newB);
    5.55 +
    5.56 +        A a = new A();
    5.57 +    }
    5.58 +
    5.59 +    static class A extends B {
    5.60 +    }
    5.61 +
    5.62 +    static class B {
    5.63 +        protected void finalize() {
    5.64 +            // should be empty
    5.65 +        }
    5.66 +    }
    5.67 +}
     6.1 --- a/test/runtime/RedefineFinalizer/manifest.mf	Wed May 28 07:36:32 2014 -0700
     6.2 +++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
     6.3 @@ -1,5 +0,0 @@
     6.4 -Main-Class: Main
     6.5 -Agent-Class: Agent
     6.6 -Can-Redefine-Classes: true
     6.7 -Can-Retransform-Classes: true
     6.8 -Premain-Class: Agent
     7.1 --- a/test/runtime/RedefineFinalizer/testme.sh	Wed May 28 07:36:32 2014 -0700
     7.2 +++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
     7.3 @@ -1,49 +0,0 @@
     7.4 -#!/bin/sh
     7.5 -
     7.6 -# Copyright (c) 2014 Oracle and/or its affiliates. All rights reserved.
     7.7 -# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
     7.8 -#
     7.9 -# This code is free software; you can redistribute it and/or modify it
    7.10 -# under the terms of the GNU General Public License version 2 only, as
    7.11 -# published by the Free Software Foundation.
    7.12 -#
    7.13 -# This code is distributed in the hope that it will be useful, but WITHOUT
    7.14 -# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    7.15 -# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    7.16 -# version 2 for more details (a copy is included in the LICENSE file that
    7.17 -# accompanied this code).
    7.18 -#
    7.19 -# You should have received a copy of the GNU General Public License version
    7.20 -# 2 along with this work; if not, write to the Free Software Foundation,
    7.21 -# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
    7.22 -#
    7.23 -# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
    7.24 -# or visit www.oracle.com if you need additional information or have any
    7.25 -# questions.
    7.26 -
    7.27 -
    7.28 -# @test
    7.29 -# @bug 6904403
    7.30 -# @summary Don't assert if we redefine finalize method
    7.31 -# @run shell testme.sh
    7.32 -
    7.33 -# This test shouldn't provoke and assert(f == k->has_finalizer()) failed: inconsistent has_finalizer
    7.34 -
    7.35 -. ${TESTSRC}/../../test_env.sh
    7.36 -
    7.37 -JAVAC=${COMPILEJAVA}${FS}bin${FS}javac
    7.38 -JAR=${COMPILEJAVA}${FS}bin${FS}jar
    7.39 -JAVA=${TESTJAVA}${FS}bin${FS}java
    7.40 -
    7.41 -TOOLS_JAR=${TESTJAVA}${FS}lib${FS}tools.jar
    7.42 -
    7.43 -cp ${TESTSRC}${FS}*.java .
    7.44 -${JAVAC} -XDignore.symbol.file -classpath ${TOOLS_JAR} -sourcepath ${TESTSRC} *.java
    7.45 -if [ $? -eq 1 ]
    7.46 -  then
    7.47 -    echo "Compilation failed"
    7.48 -    exit
    7.49 -fi
    7.50 -
    7.51 -${JAR} cvfm testcase.jar ${TESTSRC}/manifest.mf .
    7.52 -${JAVA} -Xbootclasspath/a:${TOOLS_JAR} -javaagent:${PWD}/testcase.jar Main
     8.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     8.2 +++ b/test/testlibrary/RedefineClassHelper.java	Mon Jun 02 19:08:18 2014 +0200
     8.3 @@ -0,0 +1,79 @@
     8.4 +/*
     8.5 + * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
     8.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
     8.7 + *
     8.8 + * This code is free software; you can redistribute it and/or modify it
     8.9 + * under the terms of the GNU General Public License version 2 only, as
    8.10 + * published by the Free Software Foundation.
    8.11 + *
    8.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
    8.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    8.14 + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    8.15 + * version 2 for more details (a copy is included in the LICENSE file that
    8.16 + * accompanied this code).
    8.17 + *
    8.18 + * You should have received a copy of the GNU General Public License version
    8.19 + * 2 along with this work; if not, write to the Free Software Foundation,
    8.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
    8.21 + *
    8.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
    8.23 + * or visit www.oracle.com if you need additional information or have any
    8.24 + * questions.
    8.25 + */
    8.26 +
    8.27 +import java.io.PrintWriter;
    8.28 +import java.lang.instrument.*;
    8.29 +import com.oracle.java.testlibrary.*;
    8.30 +
    8.31 +/*
    8.32 + * Helper class to write tests that redefine classes.
    8.33 + * When main method is run, it will create a redefineagent.jar that can be used
    8.34 + * with the -javaagent option to support redefining classes in jtreg tests.
    8.35 + *
    8.36 + * See sample test in test/testlibrary_tests/RedefineClassTest.java
    8.37 + */
    8.38 +public class RedefineClassHelper {
    8.39 +
    8.40 +    public static Instrumentation instrumentation;
    8.41 +    public static void premain(String agentArgs, Instrumentation inst) {
    8.42 +        instrumentation = inst;
    8.43 +    }
    8.44 +
    8.45 +    /**
    8.46 +     * Redefine a class
    8.47 +     *
    8.48 +     * @param clazz Class to redefine
    8.49 +     * @param javacode String with the new java code for the class to be redefined
    8.50 +     */
    8.51 +    public static void redefineClass(Class clazz, String javacode) throws Exception {
    8.52 +        byte[] bytecode = InMemoryJavaCompiler.compile(clazz.getName(), javacode);
    8.53 +        redefineClass(clazz, bytecode);
    8.54 +    }
    8.55 +
    8.56 +    /**
    8.57 +     * Redefine a class
    8.58 +     *
    8.59 +     * @param clazz Class to redefine
    8.60 +     * @param bytecode byte[] with the new class
    8.61 +     */
    8.62 +    public static void redefineClass(Class clazz, byte[] bytecode) throws Exception {
    8.63 +        instrumentation.redefineClasses(new ClassDefinition(clazz, bytecode));
    8.64 +    }
    8.65 +
    8.66 +    /**
    8.67 +     * Main method to be invoked before test to create the redefineagent.jar
    8.68 +     */
    8.69 +    public static void main(String[] args) throws Exception {
    8.70 +        ClassFileInstaller.main("RedefineClassHelper");
    8.71 +
    8.72 +        PrintWriter pw = new PrintWriter("MANIFEST.MF");
    8.73 +        pw.println("Premain-Class: RedefineClassHelper");
    8.74 +        pw.println("Can-Redefine-Classes: true");
    8.75 +        pw.close();
    8.76 +
    8.77 +        sun.tools.jar.Main jarTool = new sun.tools.jar.Main(System.out, System.err, "jar");
    8.78 +        if (!jarTool.run(new String[] { "-cmf", "MANIFEST.MF", "redefineagent.jar", "RedefineClassHelper.class" })) {
    8.79 +            throw new Exception("jar operation failed");
    8.80 +        }
    8.81 +    }
    8.82 +}
     9.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     9.2 +++ b/test/testlibrary_tests/RedefineClassTest.java	Mon Jun 02 19:08:18 2014 +0200
     9.3 @@ -0,0 +1,54 @@
     9.4 +/*
     9.5 + * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
     9.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
     9.7 + *
     9.8 + * This code is free software; you can redistribute it and/or modify it
     9.9 + * under the terms of the GNU General Public License version 2 only, as
    9.10 + * published by the Free Software Foundation.
    9.11 + *
    9.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
    9.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    9.14 + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    9.15 + * version 2 for more details (a copy is included in the LICENSE file that
    9.16 + * accompanied this code).
    9.17 + *
    9.18 + * You should have received a copy of the GNU General Public License version
    9.19 + * 2 along with this work; if not, write to the Free Software Foundation,
    9.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
    9.21 + *
    9.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
    9.23 + * or visit www.oracle.com if you need additional information or have any
    9.24 + * questions.
    9.25 + */
    9.26 +
    9.27 +/*
    9.28 + * @test
    9.29 + * @library /testlibrary
    9.30 + * @summary Proof of concept test for RedefineClassHelper
    9.31 + * @build RedefineClassHelper
    9.32 + * @run main RedefineClassHelper
    9.33 + * @run main/othervm -javaagent:redefineagent.jar RedefineClassTest
    9.34 + */
    9.35 +
    9.36 +import static com.oracle.java.testlibrary.Asserts.*;
    9.37 +import com.oracle.java.testlibrary.*;
    9.38 +
    9.39 +/*
    9.40 + * Proof of concept test for the test utility class RedefineClassHelper
    9.41 + */
    9.42 +public class RedefineClassTest {
    9.43 +
    9.44 +    public static String newClass = "class RedefineClassTest$A { public int Method() { return 2; } }";
    9.45 +    public static void main(String[] args) throws Exception {
    9.46 +        A a = new A();
    9.47 +        assertTrue(a.Method() == 1);
    9.48 +        RedefineClassHelper.redefineClass(A.class, newClass);
    9.49 +        assertTrue(a.Method() == 2);
    9.50 +    }
    9.51 +
    9.52 +    static class A {
    9.53 +        public int Method() {
    9.54 +            return 1;
    9.55 +        }
    9.56 +    }
    9.57 +}

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