Unable to call CreateJavaVM through .so file

Question

Hi,
I was able to run the basic invoke2.c program to call a java class.
What I did was, changed the main() as load_func() with all statments intact.
I created a module.so file (code attached) with this program.
I tried to call the java program by calling the function in .so file, but it gave me an error. I have given the .log file that was created on executing this program.
Can any one let me know what could be the problem.
I have installed Ch Language environment in my system. which can be downloded from www.softintegration.com
I doubt that Ch defines some symbols that java also wants to define. and it causes trouble during execution and the expected functions are not run.
It would be of great if some could help me on this.
thanks in advance
kabilesh
//main.c which i used to call the module.so
#include <stdio.h>
#include <dlfcn.h>
int main(){
   void *handle;
   int (*fp)();
   char *modname = "./module.so";
   handle = dlopen(modname, RTLD_LAZY);
   if (handle == NULL) {
      fprintf(stderr, "Can't load %s %s\n", modname, dlerror());
      exit(1);
   fp = (int (*)())dlsym(handle, "load_func");
   if (fp== NULL) {
      fprintf(stderr, "ERROR: dlsym()  %s \n", dlerror());
      exit(1);
   printf("ok\n");
   fp();
//module.c which i compiled and linked to create module.so
#include<jni.h>
#include<math.h>
#include<stdio.h>
#define USER_CLASSPATH "." /* where Prog.class is */
jint load_func(void *varg)
//int main()
JNIEnv *env;
JavaVM *jvm;
jint res;
jclass cls;
jmethodID mid;
jstring jstr;
jclass stringClass;
jobjectArray args;
JavaVMInitArgs vm_args;
JavaVMOption options[1];
options[0].optionString =
"-Djava.class.path=" USER_CLASSPATH;
vm_args.version = 0x00010002;
vm_args.options = options;
vm_args.nOptions = 1;
vm_args.ignoreUnrecognized = JNI_TRUE;
printf("Inside load_func.c \n");
printf("before JNI_CreateJavaVM(&jvm, (void**)&env, &vm_args\n");
res = JNI_CreateJavaVM(&jvm, (void**)&env, &vm_args);
/* never reach here */
printf("after JNI_CreateJavaVM(&jvm, (void**)&env, &vm_args\n");
if (res < 0) {
printf("Can't create Java VM res = %d\n",res);
exit(1);
cls = (*env)->FindClass(env, "Prog");
if (cls == NULL) {
        printf("findd class NULL \n");
        goto destroy;
mid = (*env)->GetStaticMethodID(env, cls,
"main","([Ljava/lang/String;)V");
if (mid == NULL) {
goto destroy;
jstr = (*env)->NewStringUTF(env, " \n from C!");
printf("\n from c just for fun\n");
if (jstr == NULL) {
goto destroy;
stringClass = (*env)->FindClass(env, "java/lang/String");
args = (*env)->NewObjectArray(env, 1, stringClass, jstr);
if (args == NULL) {
goto destroy;
(*env)->CallStaticVoidMethod(env, cls, mid, args);
destroy:
printf("destroy\n");
if ((*env)->ExceptionOccurred(env)) {
(*env)->ExceptionDescribe(env);
(*jvm)->DestroyJavaVM(jvm);
//Prog.java
public class Prog {
    public static void main(String[] args) {
        System.out.println("Hello World from java \n" + args[0]);
#Makefile that i used
CC = cc
IFLAG= -I  /home/kcheeta/sunjava/j2sdk1.4.2_06/include -I /home/kcheeta/sunjava/j2sdk1.4.2_06/include/linux
LFLAG=  -L /home/kcheeta/sunjava/j2sdk1.4.2_06/jre/lib/i386/client
# for Linux
CFLAGS =
LFLAGS = -shared
all: prog module.so
prog: main.o
#       $(CC) -o a.out main.o -lc -lm -ldl -rdynamic -lcurses -lcrypt
        $(CC) -o a.out main.o -ldl
main.o: main.c
        $(CC) $(CFLAGS) -c main.c
module.so: module.o
        $(CC) $(LFLAGS) -o module.so module.o $(LFLAG) -ljvm
module.o: module.c
        $(CC) $(CFLAGS) -c module.c $(IFLAG)
clean:
        rm -f *.o *.so prog a.out *.dl
//The log file that the program generated on execution
Unexpected Signal : 11 occurred at PC=0x402831A2
Function=(null)+0x402831A2
Library=/home/kcheeta/c2java_linux/bin/jre/lib/i386/client/libjvm.so
NOTE: We are unable to locate the function name symbol for the error
      just occurred. Please refer to release documentation for possible
      reason and solutions.
Current Java thread:
Dynamic libraries:
08048000-08049000 r-xp 00000000 03:03 3925708    /home/kcheeta/sunjava/c2java_linux/demos/a.out
08049000-0804a000 rw-p 00000000 03:03 3925708    /home/kcheeta/sunjava/c2java_linux/demos/a.out
40000000-40015000 r-xp 00000000 03:02 98139      /lib/ld-2.3.2.so
40015000-40016000 rw-p 00015000 03:02 98139      /lib/ld-2.3.2.so
40016000-40017000 r-xp 00000000 03:03 3925716    /home/kcheeta/sunjava/c2java_linux/demos/module.so
40017000-40018000 rw-p 00000000 03:03 3925716    /home/kcheeta/sunjava/c2java_linux/demos/module.so
40018000-40023000 r-xp 00000000 03:02 181427     /lib/tls/libpthread-0.34.so
40023000-40024000 rw-p 0000a000 03:02 181427     /lib/tls/libpthread-0.34.so
40027000-4002a000 r-xp 00000000 03:02 98185      /lib/libdl-2.3.2.so
4002a000-4002b000 rw-p 00002000 03:02 98185      /lib/libdl-2.3.2.so
4002b000-40427000 r-xp 00000000 03:03 492335     /home/kcheeta/c2java_linux/bin/jre/lib/i386/client/libjvm.so
40427000-40443000 rw-p 003fb000 03:03 492335     /home/kcheeta/c2java_linux/bin/jre/lib/i386/client/libjvm.so
40456000-4045e000 r-xp 00000000 03:03 492329     /home/kcheeta/c2java_linux/bin/jre/lib/i386/native_threads/libhpi.so
4045e000-4045f000 rw-p 00007000 03:03 492329     /home/kcheeta/c2java_linux/bin/jre/lib/i386/native_threads/libhpi.so
4045f000-40463000 rw-s 00000000 03:02 263384     /tmp/hsperfdata_kcheeta/27916
40465000-40477000 r-xp 00000000 03:02 98161      /lib/libnsl-2.3.2.so
40477000-40478000 rw-p 00011000 03:02 98161      /lib/libnsl-2.3.2.so
4047a000-4049b000 r-xp 00000000 03:02 181426     /lib/tls/libm-2.3.2.so
4049b000-4049c000 rw-p 00020000 03:02 181426     /lib/tls/libm-2.3.2.so
404ac000-404b7000 r-xp 00000000 03:02 98334      /lib/libnss_files-2.3.2.so
404b7000-404b8000 rw-p 0000a000 03:02 98334      /lib/libnss_files-2.3.2.so
404b8000-404c0000 r-xp 00000000 03:02 98171      /lib/libnss_nis-2.3.2.so
404c0000-404c1000 rw-p 00008000 03:02 98171      /lib/libnss_nis-2.3.2.so
404c1000-404d1000 r-xp 00000000 03:03 492340     /home/kcheeta/c2java_linux/bin/jre/lib/i386/libverify.so
404d1000-404d3000 rw-p 0000f000 03:03 492340     /home/kcheeta/c2java_linux/bin/jre/lib/i386/libverify.so
404d3000-404f3000 r-xp 00000000 03:03 492341     /home/kcheeta/c2java_linux/bin/jre/lib/i386/libjava.so
404f3000-404f5000 rw-p 0001f000 03:03 492341     /home/kcheeta/c2java_linux/bin/jre/lib/i386/libjava.so
404f5000-40509000 r-xp 00000000 03:03 492343     /home/kcheeta/c2java_linux/bin/jre/lib/i386/libzip.so
40509000-4050c000 rw-p 00013000 03:03 492343     /home/kcheeta/c2java_linux/bin/jre/lib/i386/libzip.so
4050c000-41eb3000 r--s 00000000 03:03 492412     /home/kcheeta/c2java_linux/bin/jre/lib/rt.jar
41efd000-41f13000 r--s 00000000 03:03 492365     /home/kcheeta/c2java_linux/bin/jre/lib/sunrsasign.jar
41f13000-41ff0000 r--s 00000000 03:03 492409     /home/kcheeta/c2java_linux/bin/jre/lib/jsse.jar
42000000-42130000 r-xp 00000000 03:02 179899     /lib/tls/libc-2.3.2.so
42130000-42133000 rw-p 00130000 03:02 179899     /lib/tls/libc-2.3.2.so
42136000-42147000 r--s 00000000 03:03 492366     /home/kcheeta/c2java_linux/bin/jre/lib/jce.jar
42147000-426a0000 r--s 00000000 03:03 492410     /home/kcheeta/c2java_linux/bin/jre/lib/charsets.jar
Heap at VM Abort:
Heap def new generation   total 576K, used 0K [0x44750000, 0x447f0000, 0x44c30000)
  eden space 512K,   0% used [0x44750000, 0x44750048, 0x447d0000)  from space 64K,   0% used [0x447d0000, 0x447d0000, 0x447e0000)
  to   space 64K,   0% used [0x447e0000, 0x447e0000, 0x447f0000) tenured generation   total 1408K, used 0K [0x44c30000, 0x44d90000, 0x48750000)
   the space 1408K,   0% used [0x44c30000, 0x44c30000, 0x44c30200, 0x44d90000) compacting perm gen  total 4096K, used 277K [0x48750000, 0x48b50000, 0x4c750000)   the space 4096K,   6% used [0x48750000, 0x487956c0, 0x48795800, 0x48b50000)
Local Time = Wed Mar  9 10:28:58 2005
Elapsed Time = 0#
# HotSpot Virtual Machine Error : 11
# Error ID : 4F530E43505002EF
# Please report this error at# http://java.sun.com/cgi-bin/bugreport.cgi
# Java VM: Java HotSpot(TM) Client VM (1.4.2_06-b03 mixed mode)
#

Answer 1

Hello,
How are you calling the chm file? If you are using a click
box, you should be able to set the on success field to "Open URL or
File" and type in the name of the file that you want to open. As
long as it is in the same directory, this should not be a problem.
Hope this helps
Doug