hi
i am trying to call some java APIs from c . i use the standatd JNI
calls to load the JVM from a c program and call all java functions by
using a pointer to the jvm which was returned by the JNI call
the source code is given below and also the errors ..
Plz help in resolving these.

This is a code being (slightly modified ) which was downloaded from SUN
website :

#include <jni.h>
#include <errno.h>
#define PATH_SEPARATOR ';'
#define USER_CLASSPATH "."

JavaVM            *jvm;        /* Pointer to a Java VM */
JNIEnv            *env;        /* Pointer to native method interface */
JDK1_1InitArgs    vm_args;    /* JDK 1.1 VM initialization requirements */
int             verbose = 1;/* Debugging flag */
/*******************************************************hasExceptionOccurred
*    Check to see if there is an exception. If there is one
*  return the string with the value.
*    Returns the following:
*    > 0 Exception raised
*    null no exception
*    Exits for fatal errors such as
*
*    unable to find object class for java.lang.Throwable
*    unable to find method id getMessage in java.lang.Throwable
*    unable to call method getMessage in java.lang.Throwable
*    unable to UTF charchaters from String object returned from
getMessage
*/
char *hasExceptionOccurred( JNIEnv *env) {
    jthrowable    jthr;
    jclass        jThrowableClass;
    jmethodID    mid;
    jstring        errorString;
    const jbyte    *errorInCString;
    jthr         = (*env)->ExceptionOccurred ( env );

    printf("Is there an exception?" );
    /* If there was an exception,  extract the message from the object */
    if ( jthr != (jthrowable)0 ) {
        printf (" Yes." );
        jThrowableClass = (*env)->GetObjectClass(env,jthr);
        if ( verbose )
            printf("The class for java.lang.Throwable is %x\n",jThrowableClass);
        if ( jThrowableClass == 0 )
            exit(-1);
        mid = (*env)->GetMethodID( env, jThrowableClass, "getMessage",
"()Ljava/lang/String;" );
        if ( verbose )
            printf("The method id for the ThrowableClass is %x\n", mid);
        if ( mid == 0 )
            exit(-1);
        errorString = (*env)->CallObjectMethod(env, jthr, mid);
        if ( verbose )
            printf("The java string object with the message  is %x\n",
errorString);
        if ( errorString == 0 )
            exit(-1);
        errorInCString = (*env)->GetStringUTFChars(env,errorString,0);
        if ( errorInCString == 0 )  {
            exit(-1);
        /* N.B. The following is not valid for all UTF strings */
            printf ( "UTF stirng error");
            }
        if ( verbose )
            printf("The error from Java is \"%s\".\n", errorInCString );
        (*env)->ReleaseStringUTFChars(env,errorString,errorInCString);
    } else
        if ( verbose )
            printf (" No." );

    return ( (char *) 0 );
}
/***********************************************************************Main*/
/*
*    Get the default initialization arguments and set the class path
*    Call a method in java without raising an exception
*  Call a mewthod in Java expecting to have an exception raised
*/
main(int argc, char **argv ) {

    jclass        cls;
    jclass        testcls;
    jmethodID    mid;
    jthrowable    jthr;
    jint         res;
    char classpath[1024];
    JavaVMInitArgs vm_args;
    JavaVMOption options[5];

    options[0].optionString = "-Xms4M";
      options[1].optionString = "-Xmx64M";
      options[2].optionString = "-Xss512K";
      options[3].optionString = "-Xoss400K";
      options[4].optionString = "-Djava.class.path=.";

    //vm_args.version = JNI_VERSION_1_4;
    vm_args.version = 0x00010004;
    vm_args.options = options;
      vm_args.nOptions = 5;
      vm_args.ignoreUnrecognized = JNI_FALSE;
    printf("Reached Here1");
    fflush(stdout);

    //vm_args.ignoreUnrecognized = JNI_TRUE;
    res = JNI_CreateJavaVM(&jvm, (void**)&env, &vm_args);

/*
    JDK1_1InitArgs vm_args;
    vm_args.version = 0x00010001;
    JNI_GetDefaultJavaVMInitArgs(&vm_args);
    // Append USER_CLASSPATH to the 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);

    vm_args.classpath = ".;/users8/e43636/JNI";
    printf("\n Now Classpath [%s]\n", vm_args.classpath);
    fflush(stdout);
    */
    printf("Reached Here");
    fflush(stdout);
    if (res < 0 )
    {
            printf("JVM Could not be loaded [%d] and errorno[%d]\n", res,errno);
            exit(1);
    }
    /*    Find the class we want to load  */
    testcls = (*env)->FindClass(env , "java/lang/String");
        printf ( "Class: %x" , testcls );

    cls = (*env)->FindClass( env, "InstantiatedFromC" );
    if ( verbose )
        printf ( "Class: %x" , cls );
    fflush(stdout);

    /*    Find the method we want to use */
    mid = (*env)->GetMethodID( env, cls, "test", "(I)I" );
    if ( verbose )
        printf ( "Method: %x" , mid );
    fflush(stdout);
    /*    Call the method we want to use */
    printf("First call to Java returns:%d\n",
(*env)->CallStaticIntMethod(env, cls, mid, 1) );
    fflush(stdout);
    getchar();
    /* Check for an exception */
//    if ( hasExceptionOccurred ( env ) != (char *)0 ) {
//        printf("Exception has occurred.\n");
//    }
    /*    Call the method we want to use and raise an exception */
//    printf("Second call to Java returns:%d\n",
//        (*env)->CallStaticIntMethod(env, cls, mid, 2) );
    /* Check for an exception */
//    if ( hasExceptionOccurred ( env ) != (char *)0 ) {
//        printf("Exception has occurred.\n");
//    }
    /*jvm->DestroyJavaVM( );*/
}

**************************************************************************************************************

Java Class whose method is being called

public class InstantiatedFromC {

    public int test(int number) throws Exception {
        System.out.println("Number from C: " + number);
        if ( number == 2 )
            throw new Exception("Exception raised in java seen in C");
        return ( number + 1 );
    }
    //public static void main(String args[]) {
    //}
}

*******************************************************************************************************************8
THe C Code above is compiled as follows::
SHLIB_PATH=/opt/java1.4/jre/lib/PA_RISC:/opt/java1.4/jre/lib/PA_RISC/server:$SHLIB_PATH
export SHLIB_PATH
gcc  -g tcl2JavaVM.c -I/opt/java1.4/include
-I/opt/java1.4/include/hp-ux
-L/opt/java1.4/jre/lib/PA_RISC/native_threads
-L/opt/java1.4/jre/lib/PA_RISC -L/opt/java1.4/jre/lib/PA_RISC/server
-ljvm -lpthread -llwp

on HP-UX machine...

**************************************************************************************************************8

THe error stack being generated :

Reached Here1Reached HereClass: 4000c7a0Class: 4000c7c4Method: 4013fd78
Unexpected Signal : 4 occurred at PC=0x680A9F28
Function=[Unknown.]
Library=/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl

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:
"main" prio=7 tid=4000bca8 nid=1 lwp_id=6600282 runnable
[0x680f9000..0x680f9628]
Stack_Trace: error while unwinding stack
( 0)  0x9139d884   report_error__FbPCciN22e + 0x6c
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 1)  0x9139d680   report_should_not_reach_here__FPCci + 0x3c
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 2)  0x913e1ecc   sender__5frameCFP11RegisterMapP8CodeBlob + 0x1ac
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 3)  0x913de8bc   real_sender__5frameCFP11RegisterMap + 0x20
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 4)  0x91779430   sender__6vframeCFv + 0x6c
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 5)  0x91744760   last_java_vframe__10JavaThreadFP11RegisterMap +
0x128  [/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 6)  0x9174432c   print_stack__10JavaThreadFv + 0x8c
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 7)  0x91649524   report_fatal_error__2osSFP12outputStreamPUci + 0x584
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 8)  0x9164a3c0   handle_unexpected_exception__2osSFP6ThreadiPUcPv +
0x680  [/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 9)  0x91655398
JVM_handle_hpux_signal__Q2_2os4HpuxSFiP9__siginfoPvT1 + 0xa10
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
(10)  0x91651bbc   signalHandler__Q2_2os4HpuxSFiP9__siginfoPv + 0x14
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
(11)  0xc020d138   _sigreturn  [/usr/lib/libc.2]
[error occured during error reporting]
Stack_Trace: error while unwinding stack
( 0)  0x9139d884   report_error__FbPCciN22e + 0x6c
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 1)  0x9139d680   report_should_not_reach_here__FPCci + 0x3c
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 2)  0x913e1ecc   sender__5frameCFP11RegisterMapP8CodeBlob + 0x1ac
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 3)  0x913de8bc   real_sender__5frameCFP11RegisterMap + 0x20
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 4)  0x91779430   sender__6vframeCFv + 0x6c
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 5)  0x91744760   last_java_vframe__10JavaThreadFP11RegisterMap +
0x128  [/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 6)  0x9174432c   print_stack__10JavaThreadFv + 0x8c
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 7)  0x91649524   report_fatal_error__2osSFP12outputStreamPUci + 0x584
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 8)  0x9164a3c0   handle_unexpected_exception__2osSFP6ThreadiPUcPv +
0x680  [/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 9)  0x91655398
JVM_handle_hpux_signal__Q2_2os4HpuxSFiP9__siginfoPvT1 + 0xa10
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
(10)  0x91651bbc   signalHandler__Q2_2os4HpuxSFiP9__siginfoPv + 0x14
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
(11)  0xc020d138   _sigreturn  [/usr/lib/libc.2]
    4    Reached Here1Reached HereClass: 4000c7a0Class: 4000c7c4Method:
4013fd78^
M
   5    Unexpected Signal : 4 occurred at PC=0x680A9F28^M
    6    Function=[Unknown.]^M
    7    Library=/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl^M
    8    ^M
9    NOTE: We are unable to locate the function name symbol for the
error^M
   10        just occurred. Please refer to release documentation for
possible^
M
  11        reason and solutions.^M
   12    ^M
   13    ^M
   14    Current Java thread:^M
   15    "main" prio=7 tid=4000bca8 nid=1 lwp_id=6600282 runnable
[0x680f9000..0x
680f9628]^M
   16    Stack_Trace: error while unwinding stack^M
   17    ( 0)  0x9139d884   report_error__FbPCciN22e + 0x6c
[/opt/java1.4/jre/li
b/PA_RISC/server/libjvm.sl]^M
@    "resu" [Incomplete last line] 44 lines, 3596 characters

   18    ( 1)  0x9139d680   report_should_not_reach_here__FPCci + 0x3c
[/opt/jav
Da1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D19    ( 2)  0x913e1ecc   sender__5frameCFP11RegisterMapP8CodeBlob
+ 0x1ac  [/o
Dpt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D20    ( 3)  0x913de8bc   real_sender__5frameCFP11RegisterMap +
0x20  [/opt/jav
Da1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D21    ( 4)  0x91779430   sender__6vframeCFv + 0x6c
[/opt/java1.4/jre/lib/PA_R
DISC/server/libjvm.sl]^M


D22    ( 5)  0x91744760
last_java_vframe__10JavaThreadFP11RegisterMap + 0x128
D  [/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D23    ( 6)  0x9174432c   print_stack__10JavaThreadFv + 0x8c
[/opt/java1.4/jre
D/lib/PA_RISC/server/libjvm.sl]^M


D24    ( 7)  0x91649524
report_fatal_error__2osSFP12outputStreamPUci + 0x584
D
 [/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D25    ( 8)  0x9164a3c0
handle_unexpected_exception__2osSFP6ThreadiPUcPv + 0x
D680  [/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D26    ( 9)  0x91655398
JVM_handle_hpux_signal__Q2_2os4HpuxSFiP9__siginfoPvT1
D + 0xa10  [/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D27    (10)  0x91651bbc
signalHandler__Q2_2os4HpuxSFiP9__siginfoPv + 0x14  [/
Dopt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D28    (11)  0xc020d138   _sigreturn  [/usr/lib/libc.2]^M

D29    [error occured during error reporting]^M

D30    Stack_Trace: error while unwinding stack^M

D31    ( 0)  0x9139d884   report_error__FbPCciN22e + 0x6c
[/opt/java1.4/jre/li
Db/PA_RISC/server/libjvm.sl]^M


D32    ( 1)  0x9139d680   report_should_not_reach_here__FPCci +
0x3c  [/opt/jav
Da1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D33    ( 2)  0x913e1ecc   sender__5frameCFP11RegisterMapP8CodeBlob
+ 0x1ac  [/o
Dpt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D34    ( 3)  0x913de8bc   real_sender__5frameCFP11RegisterMap +
0x20  [/opt/jav
Da1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D35    ( 4)  0x91779430   sender__6vframeCFv + 0x6c
[/opt/java1.4/jre/lib/PA_R
DISC/server/libjvm.sl]^M


D36    ( 5)  0x91744760
last_java_vframe__10JavaThreadFP11RegisterMap + 0x128
D  [/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D37    ( 6)  0x9174432c   print_stack__10JavaThreadFv + 0x8c
[/opt/java1.4/jre
D/lib/PA_RISC/server/libjvm.sl]^M


D38    ( 7)  0x91649524
report_fatal_error__2osSFP12outputStreamPUci + 0x584
D
 [/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D39    ( 8)  0x9164a3c0
handle_unexpected_exception__2osSFP6ThreadiPUcPv + 0x
D680  [/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D40    ( 9)  0x91655398
JVM_handle_hpux_signal__Q2_2os4HpuxSFiP9__siginfoPvT1
D + 0xa10  [/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D41    (10)  0x91651bbc
signalHandler__Q2_2os4HpuxSFiP9__siginfoPv + 0x14  [/
Dopt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D42    (11)  0xc020d138   _sigreturn  [/usr/lib/libc.2]^M

************************************************************************************************************

any help in this regard will be gtreatly appriciated

Thanks in advance
rahul