Hello,
I am trying to use JNI_CreateJavaVM() to create a JVM, but I am
having what I think are classpath problems. The JVM starts ok, but then
fails to find my class. Does anyone have any ideas?
Versions:
gcc 3.3.4-1 The GNU C compiler
jikes 1.21-2 Fast Java compiler adhering to language and
jikes-sablevm 1.1.0-5 Wrapper for jikes using classes from SableVM
sablevm 1.1.0-5 Free implementation of Java Virtual Machine
libsablevm1-de 1.1.0-5 Free implementation of JVM secon edition - d
Build commands:
gcc -lsablevm main.c -o main
jikes-sablevm Foo.java
Running:
$ ./main
error finding 'Foo' class
$
Test files:
/* Foo.java */
public class Foo {
public static void main(String args[]) {
System.out.println("Foo::main()");
}
}
/* main.c */
#include <jni.h>
#include <stdio.h>
int main(int argc, char *argv[]) {
JavaVMOption options[1];
JavaVMInitArgs vm_args;
JNIEnv *env = NULL;
JavaVM *jvm = NULL;
jint jni_error;
jclass java_class;
jmethodID method_id;
/* Setup the options list. */
options[0].optionString = "-Djava.class.path=.";
options[0].extraInfo = NULL;
/* Setup the vm_args structure. */
memset(&vm_args, 0, sizeof(vm_args));
vm_args.version = JNI_VERSION_1_2;
vm_args.options = options;
vm_args.nOptions = sizeof(options) / sizeof(options[0]);
/* Create the Java Virtual Machine. */
jni_error = JNI_CreateJavaVM(&jvm, (void **) &env, &vm_args);
if (jni_error < 0) {
printf("ERROR: Unable to create JVM, (%i)\n", (int) jni_error);
return(1);
}
/* Get the "Foo" class. */
java_class = (*env)->FindClass(env, "Foo");
if (java_class == NULL) {
printf("error finding 'Foo' class\n");
return(1);
}
/* Get the "main" method ID. */
method_id = (*env)->GetStaticMethodID(
env,
java_class,
"main",
"([Ljava/lang/String;)V"
);
if (method_id == NULL) {
printf("error finding 'main' method\n");
return(1);
}
/* Call Foo::main(). */
(*env)->CallStaticVoidMethod(
env,
java_class,
method_id,
NULL /* args */
);
/* Destroy the VM. */
(*jvm)->DestroyJavaVM(jvm);
/* Exit. */
argc = argc;
argv = argv;
return(0);
}
--
Tom Schutter (mailto:to...@pl...)
Platte River Associates, Inc. (http://www.platte.com)
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