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Calling Java APIs fr4om C

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 */
/*************** *************** *************** **********hasEx ceptionOccurred
* 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.Throw able
* unable to find method id getMessage in java.lang.Throw able
* unable to call method getMessage in java.lang.Throw able
* unable to UTF charchaters from String object returned from
getMessage
*/
char *hasExceptionOc curred( JNIEnv *env) {
jthrowable jthr;
jclass jThrowableClass ;
jmethodID mid;
jstring errorString;
const jbyte *errorInCString ;
jthr = (*env)->ExceptionOccur red ( 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.Throw able is %x\n",jThrowabl eClass);
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)->CallObjectMeth od(env, jthr, mid);
if ( verbose )
printf("The java string object with the message is %x\n",
errorString);
if ( errorString == 0 )
exit(-1);
errorInCString = (*env)->GetStringUTFCh ars(env,errorSt ring,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)->ReleaseStringU TFChars(env,err orString,errorI nCString);
} 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.pat h=.";

//vm_args.version = JNI_VERSION_1_4 ;
vm_args.version = 0x00010004;
vm_args.options = options;
vm_args.nOption s = 5;
vm_args.ignoreU nrecognized = JNI_FALSE;
printf("Reached Here1");
fflush(stdout);

//vm_args.ignoreU nrecognized = JNI_TRUE;
res = JNI_CreateJavaV M(&jvm, (void**)&env, &vm_args);

/*
JDK1_1InitArgs vm_args;
vm_args.version = 0x00010001;
JNI_GetDefaultJ avaVMInitArgs(& vm_args);
// Append USER_CLASSPATH to the default system class path
sprintf(classpa th, "%s%c%s", vm_args.classpa th, PATH_SEPARATOR,
USER_CLASSPATH) ;
vm_args.classpa th = classpath;
// Create the Java VM
res = JNI_CreateJavaV M(&jvm, &env, &vm_args);
vm_args.classpa th = ".;/users8/e43636/JNI";
printf("\n Now Classpath [%s]\n", vm_args.classpa th);
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(en v , "java/lang/String");
printf ( "Class: %x" , testcls );

cls = (*env)->FindClass( env, "InstantiatedFr omC" );
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)->CallStaticIntM ethod(env, cls, mid, 1) );
fflush(stdout);
getchar();
/* Check for an exception */
// if ( hasExceptionOcc urred ( env ) != (char *)0 ) {
// printf("Excepti on has occurred.\n");
// }
/* Call the method we want to use and raise an exception */
// printf("Second call to Java returns:%d\n",
// (*env)->CallStaticIntM ethod(env, cls, mid, 2) );
/* Check for an exception */
// if ( hasExceptionOcc urred ( env ) != (char *)0 ) {
// printf("Excepti on has occurred.\n");
// }
/*jvm->DestroyJavaV M( );*/
}
*************** *************** *************** *************** *************** *************** *************** *****

Java Class whose method is being called

public class InstantiatedFro mC {

public int test(int number) throws Exception {
System.out.prin tln("Number from C: " + number);
if ( number == 2 )
throw new Exception("Exce ption 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_P ATH
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..0x6 80f9628]
Stack_Trace: error while unwinding stack
( 0) 0x9139d884 report_error__F bPCciN22e + 0x6c
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 1) 0x9139d680 report_should_n ot_reach_here__ FPCci + 0x3c
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 2) 0x913e1ecc sender__5frameC FP11RegisterMap P8CodeBlob + 0x1ac
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 3) 0x913de8bc real_sender__5f rameCFP11Regist erMap + 0x20
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 4) 0x91779430 sender__6vframe CFv + 0x6c
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 5) 0x91744760 last_java_vfram e__10JavaThread FP11RegisterMap +
0x128 [/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 6) 0x9174432c print_stack__10 JavaThreadFv + 0x8c
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 7) 0x91649524 report_fatal_er ror__2osSFP12ou tputStreamPUci + 0x584
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 8) 0x9164a3c0 handle_unexpect ed_exception__2 osSFP6ThreadiPU cPv +
0x680 [/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 9) 0x91655398
JVM_handle_hpux _signal__Q2_2os 4HpuxSFiP9__sig infoPvT1 + 0xa10
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
(10) 0x91651bbc signalHandler__ Q2_2os4HpuxSFiP 9__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__F bPCciN22e + 0x6c
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 1) 0x9139d680 report_should_n ot_reach_here__ FPCci + 0x3c
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 2) 0x913e1ecc sender__5frameC FP11RegisterMap P8CodeBlob + 0x1ac
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 3) 0x913de8bc real_sender__5f rameCFP11Regist erMap + 0x20
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 4) 0x91779430 sender__6vframe CFv + 0x6c
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 5) 0x91744760 last_java_vfram e__10JavaThread FP11RegisterMap +
0x128 [/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 6) 0x9174432c print_stack__10 JavaThreadFv + 0x8c
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 7) 0x91649524 report_fatal_er ror__2osSFP12ou tputStreamPUci + 0x584
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 8) 0x9164a3c0 handle_unexpect ed_exception__2 osSFP6ThreadiPU cPv +
0x680 [/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
( 9) 0x91655398
JVM_handle_hpux _signal__Q2_2os 4HpuxSFiP9__sig infoPvT1 + 0xa10
[/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]
(10) 0x91651bbc signalHandler__ Q2_2os4HpuxSFiP 9__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__F bPCciN22e + 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_n ot_reach_here__ FPCci + 0x3c
[/opt/jav
Da1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D19 ( 2) 0x913e1ecc sender__5frameC FP11RegisterMap P8CodeBlob
+ 0x1ac [/o
Dpt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D20 ( 3) 0x913de8bc real_sender__5f rameCFP11Regist erMap +
0x20 [/opt/jav
Da1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D21 ( 4) 0x91779430 sender__6vframe CFv + 0x6c
[/opt/java1.4/jre/lib/PA_R
DISC/server/libjvm.sl]^M


D22 ( 5) 0x91744760
last_java_vfram e__10JavaThread FP11RegisterMap + 0x128
D [/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D23 ( 6) 0x9174432c print_stack__10 JavaThreadFv + 0x8c
[/opt/java1.4/jre
D/lib/PA_RISC/server/libjvm.sl]^M


D24 ( 7) 0x91649524
report_fatal_er ror__2osSFP12ou tputStreamPUci + 0x584
D
 [/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D25 ( 8) 0x9164a3c0
handle_unexpect ed_exception__2 osSFP6ThreadiPU cPv + 0x
D680 [/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D26 ( 9) 0x91655398
JVM_handle_hpux _signal__Q2_2os 4HpuxSFiP9__sig infoPvT1
D + 0xa10 [/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D27 (10) 0x91651bbc
signalHandler__ Q2_2os4HpuxSFiP 9__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__F bPCciN22e + 0x6c
[/opt/java1.4/jre/li
Db/PA_RISC/server/libjvm.sl]^M


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


D33 ( 2) 0x913e1ecc sender__5frameC FP11RegisterMap P8CodeBlob
+ 0x1ac [/o
Dpt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D34 ( 3) 0x913de8bc real_sender__5f rameCFP11Regist erMap +
0x20 [/opt/jav
Da1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D35 ( 4) 0x91779430 sender__6vframe CFv + 0x6c
[/opt/java1.4/jre/lib/PA_R
DISC/server/libjvm.sl]^M


D36 ( 5) 0x91744760
last_java_vfram e__10JavaThread FP11RegisterMap + 0x128
D [/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D37 ( 6) 0x9174432c print_stack__10 JavaThreadFv + 0x8c
[/opt/java1.4/jre
D/lib/PA_RISC/server/libjvm.sl]^M


D38 ( 7) 0x91649524
report_fatal_er ror__2osSFP12ou tputStreamPUci + 0x584
D
 [/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D39 ( 8) 0x9164a3c0
handle_unexpect ed_exception__2 osSFP6ThreadiPU cPv + 0x
D680 [/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D40 ( 9) 0x91655398
JVM_handle_hpux _signal__Q2_2os 4HpuxSFiP9__sig infoPvT1
D + 0xa10 [/opt/java1.4/jre/lib/PA_RISC/server/libjvm.sl]^M


D41 (10) 0x91651bbc
signalHandler__ Q2_2os4HpuxSFiP 9__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

Nov 23 '06 #1
2 2822


On Nov 23, 10:10 am, "ramasubramania n.ra...@gmail.c om"
<ramasubramania n.ra...@gmail.c omwrote:
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.
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_P ATH
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...
Firstly the standard answer : Off topic. Ask in the java/sun discussion
forums.

<off-topic>
The c code must be exported/converted into a shared library which then
is used by the java code. Consult your HP-UX documentation as to how
to create a shared library and then follow the instructions given on
the sun website to get the JNI program working. The instructions on
the Sun web site are pretty good and ive done it before for Linux .
</off-topic>

Nov 23 '06 #2
On 22 Nov 2006 21:10:55 -0800, "ramasubramania n.rahul" wrote:
>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 ..
<offtopic>
- don't call Java from C (Sun deliberately made that way very
intricate), call C from Java (as suggested by Procrastinx)
- use alternative ways for communication, e.g. sockets
</offtopic>
Nov 23 '06 #3

This thread has been closed and replies have been disabled. Please start a new discussion.

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