Java HotSpot Virtual Machine

Hi,

I am using a JVM as a companion aof a big C program . Thus I start the JVM myself, using JNI_CreateJavaVM.

It is a GUI Win2K app, using some JDK1.3 or mosre recent, from SUN or IBM.


I would like to able to restart the JVM without restarting my app (for instance, to run it in debug mode, thus changing the starting parameters, or to run a different VM).

But the second call to JNI_CreateJavaVM stops my app.

Here is a small program that isolate the behavior :

#include <jni.h>
#include <stdio.h>
#include <stdlib.h> 
#include <io.h>
#include <string.h>

JavaVM *jvm,*vmBuf[1024];
JNIEnv *env;
static char * params[]=
{
    "-Djava.compiler=NONE",
    NULL

};
    JavaVMInitArgs args;
    long rc=0,nVMs;
    JavaVMOption *cp,*curcp;
    int _i,nbPar;

main()
{
    for(nbPar=0;params[nbPar]!=NULL;nbPar++);

    cp=malloc(sizeof(*cp)*(nbPar+2));
    curcp=cp;
    for(_i=0;_i<nbPar;_i++)
    {
        char *par=params[_i];
            // we make a copy because cp[].optionString is not declared as const...
        curcp->optionString=malloc(strlen(par)+1);
        strcpy(curcp->optionString,par);
        curcp++;
    }

	args.version = JNI_VERSION_1_2;
    args.nOptions = curcp-cp;
    args.options = cp;
    args.ignoreUnrecognized = JNI_FALSE;

    rc=JNI_CreateJavaVM(&jvm, (void**)&env,&args);
    if(rc != 0)
    {
        printf( "JNI_CreateJavaVM failure");
        return(1);
    }

	rc=(*jvm)->DetachCurrentThread(jvm);
    if(rc != 0)
    {
        printf( "DetachCurrentThread failure");
        return(1);
    }

	rc=(*jvm)->DestroyJavaVM(jvm);
    if(rc != 0)
    {
        printf( "DestroyJavaVM failure");
        return(1);
    }

	nVMs= -1;
	rc=JNI_GetCreatedJavaVMs(vmBuf, 1024,&nVMs);
    if(rc != 0)
    {
        printf( "JNI_GetCreatedJavaVMs failure");
        return(1);
    }
	printf("JNI_GetCreatedJavaVMs = %d\n",nVMs);

	rc=JNI_CreateJavaVM(&jvm, (void**)&env,&args);
    if(rc != 0)
    {
        printf( "Second JNI_CreateJavaVM failure");
        return(1);
    }
}

for example, running withy sun JDK1.3.01 server dll, it ouputs :

JNI_GetCreatedJavaVMs = 0
#
# HotSpot Virtual Machine Error, Internal Error
# Please report this error at
# http://java.sun.com/cgi-bin/bugreport.cgi
#
# Error ID: 455843455054494F4E530E43505000D8
#
# Problematic Thread: prio=8865624 tid=0x874758 nid=0x14a3e70b allocated
#

Is there any workaround ?
Thanks for your help

C.Dore

PS: the bug is submitted, but a wide and clever audience opinion is also accurate.