Name: tb29552 Date: 05/26/2004


FULL PRODUCT VERSION :
java version "1.5.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta-b32c)
Java HotSpot(TM) Client VM (build 1.5.0-beta-b32c, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
SunOS mary 5.9 Generic_112233-12 sun4u sparc SUNW,Sun-Blade-100

A DESCRIPTION OF THE PROBLEM :
SIGSEGV when instantiating a class redefined through java.lang.instrument.Instrumentation.redefineClass()

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
compile and run the program given with
java -javaagent:Teste Teste

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The following output is expected:
Integer
Button
ACTUAL -
Integer
#
# An unexpected error has been detected by HotSpot Virtual Machine:
#
# SIGSEGV (0xb) at pc=0xfe93b930, pid=27942, tid=6
#
# Java VM: Java HotSpot(TM) Server VM (1.5.0-beta-b32c mixed mode)
# Problematic frame:
# V [libjvm.so+0x13b930]
#
# An error report file with more information is saved as hs_err_pid27942.log
#
# If you would like to submit a bug report, please visit:
# http://java.sun.com/webapps/bugreport/crash.jsp
#
Abort


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.lang.instrument.*;
import java.io.*;

public class Teste {
    static Instrumentation instrumentation;

    public static void main(String[] args) throws Exception {
        redefine(java.lang.Integer.class);
        new java.lang.Integer(0);
        System.out.println("Integer");
        redefine(java.awt.Button.class);
        new java.awt.Button();
        System.out.println("Button");
    }

    public static void premain(String agentArgs, Instrumentation instr) {
        instrumentation = instr;
    }

    public static void redefine(Class cl) throws Exception {
        ClassLoader cloader = cl.getClassLoader();
        if (cloader == null) {
            cloader = ClassLoader.getSystemClassLoader();
        }
        String className = cl.getName().replace('.', '/') + ".class";
        InputStream is = cloader.getResourceAsStream(className);
        if (is == null) throw new RuntimeException();
        ByteArrayOutputStream bo = new ByteArrayOutputStream();
        for(int n = is.read(); n != -1; n = is.read()) {
            bo.write(n);
        }
        instrumentation.redefineClasses(new ClassDefinition[] {
              new ClassDefinition(cl, bo.toByteArray()) });
    }
}

---------- END SOURCE ----------
(Incident Review ID: 275122)
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