[moved here from "multi-bug" 4352424]

Name: yyT116575 Date: 01/04/2001


java version "1.3.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0)
Java HotSpot(TM) Client VM (build 1.3.0, mixed mode)


Used example for the book The Java Native Interface (Sheng Liang - Addison
Wesley) with some small modifications, which doesn't get used - The file name is
invoke.c as in the example:

#include <jni.h>
#include <stdio.h>

//#ifdef _WIN32
//#define PATH_SEPARATOR ';'
//#else /* UNIX */
#define PATH_SEPARATOR ':'
//#endif

#define USER_CLASSPATH "." /* where Prog.class is */

main() {
  JNIEnv *env;
  JavaVM *jvm;
  jint res;
  jclass cls;
  jmethodID mid;

  jstring arg1;
  jstring arg2;
  jstring result;

  jboolean b = 0;

  const char *c_res;

#ifdef JNI_VERSION_1_2
  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;
  res = JNI_CreateJavaVM(&jvm, (void**)&env,&vm_args);
#else
  JDK1_1InitArgs vm_args;
  char classpath[1024];
  vm_args.version = 0x00010001;
  JNI_GetDefaultJavaVMInitArgs(&vm_args);
  /* Append USER_CLASSPATH to the end of default system class path */
  sprintf(classpath, "%s%c%s",
vm_args.classpath, PATH_SEPARATOR, USER_CLASSPATH);
  vm_args.classpath = classpath;

  /* Create the Java VM */
  res = JNI_CreateJavaVM(&jvm,&env,&vm_args);
#endif /* JNI_VERSION_1_2 */

  if (res < 0) {
    goto destroy;
  }
  
  cls = (*env)->FindClass(env, "Interface");
  if (cls == NULL) {
    goto destroy;
  }
  
  mid = (*env)->GetStaticMethodID(env, cls, "Encrypt", "(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;");
  if (mid == NULL) {
    goto destroy;
  }
  
  arg1 = (*env)->NewStringUTF(env, "143");
  if (arg1 == NULL) {
    goto destroy;
  }
  arg2 = (*env)->NewStringUTF(env, "2");
  if (arg2 == NULL) {
    goto destroy;
  }

  result = (*env)->CallStaticObjectMethod(env, cls, mid, arg1, arg2);
  
  c_res = (*env)->GetStringUTFChars (env, result, &b);

  printf ("%s", c_res);

 destroy:
  if ((*env)->ExceptionOccurred (env)) {
    (*env)->ExceptionDescribe (env);
  }
  (*jvm)->DestroyJavaVM(jvm);

}

and the java file Interface.java:
import Cryptosystem.*;
import java.math.*;

public class Interface {
    public String Encrypt (String n, String msg) {
      return null;
    }
}

Comiled using:
  javac Interface.java
  gcc -I/usr/java/jdk1.3/include -I/usr/java/jdk1.3/include/linux
-L/usr/java/jdk1.3/jre/lib/i386 -L/usr/java/jdk1.3/jre/lib/i386/client -ljava -o
invoke.o invoke.c

When invoke.o is run the following error appears:
#
# HotSpot Virtual Machine Error, Unexpected Signal 11
# Please report this error at
# http://java.sun.com/cgi-bin/bugreport.cgi
#
# Error ID: 4F533F4C494E55580E43505005BC
#
# Problematic Thread: prio=10 tid=0x804b120 nid=0xd5b runnable
#
Aborted

It's the JNI_VERSION_1_2 part that is used as far as I can see.
(Review ID: 114559)
 

Name: yyT116575 Date: 02/14/2001


java version "1.3.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0)
Java HotSpot(TM) Client VM (build 1.3.0, mixed mode)

run with ./invoke

compiled with : cc invoke.c -o invoke -I/var/java/include -
I/var/java/include/linux -L/var/java/jre/lib/i386/client -ljvm

--- source start ---

#include <jni.h>

#ifdef _WIN32
#define PATH_SEPARATOR ';'
#else /* UNIX */
#define PATH_SEPARATOR ':'
#endif

#define USER_CLASSPATH "." /* where Prog.class is */

main() {
    JNIEnv *env;
    JavaVM *jvm;
    jint res;
    jclass cls;
    jmethodID mid;
    jstring jstr;
    jobjectArray args;
        JavaVMOption options[ 9 ];
    JavaVMInitArgs vm_args;
    char classpath[1024];

        vm_args.nOptions = 1;
    vm_args.version = JNI_VERSION_1_2;

    /* Append USER_CLASSPATH to the end of default system class path */
    sprintf(classpath, "%s%c%s",
            getenv( "CLASSPATH" ), PATH_SEPARATOR, USER_CLASSPATH);

    options[ 0 ].optionString = classpath;
        vm_args.options = options;

    /* Create the Java VM */
    res = JNI_CreateJavaVM( &jvm, (void**)&env, &vm_args );
    if (res < 0) {
        fprintf(stderr, "Can't create Java VM\n");
        exit(1);
    }

    cls = (*env)->FindClass(env, "Prog");
    if (cls == 0) {
        fprintf(stderr, "Can't find Prog class\n");
        exit(1);
    }
 
    mid = (*env)->GetStaticMethodID(env, cls, "main", "([Ljava/lang/String;)V");
    if (mid == 0) {
        fprintf(stderr, "Can't find Prog.main\n");
        exit(1);
    }

    jstr = (*env)->NewStringUTF(env, " from C!");
    if (jstr == 0) {
        fprintf(stderr, "Out of memory\n");
        exit(1);
    }
    args = (*env)->NewObjectArray(env, 1,
                        (*env)->FindClass(env, "java/lang/String"), jstr);
    if (args == 0) {
        fprintf(stderr, "Out of memory\n");
        exit(1);
    }
    (*env)->CallStaticVoidMethod(env, cls, mid, args);

    (*jvm)->DestroyJavaVM(jvm);
}
--- source end ---

--- error ---

#
# HotSpot Virtual Machine Error, Unexpected Signal 11
# Please report this error at
# http://java.sun.com/cgi-bin/bugreport.cgi
#
# Error ID: 4F533F4C494E55580E43505005BC
#
# Problematic Thread: prio=10 tid=0x8053488 nid=0x13f4 runnable
#
Aborted
(Review ID: 116986)
======================================================================