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creating JFrame from C via JNI

Subject: creating JFrame from C via JNI
From: "Dr. Stephen Judd" <email@hidden>
Date: Wed, 15 Mar 2006 11:26:30 -0500
Delivered-to: email@hidden
Delivered-to: email@hidden

I am trying to launch a Java program with a GUI front end from a C program. The launching, locating, and calling of methods is working fine, but creating a JFrame is causing an error that I cannot find enough documentation on:

JavaAWT: NSException not handled by native method. Passing to Java. java.lang.RuntimeException: Non-Java exception raised, not handled! (Original problem: Error (1002) creating CGSWindow) at apple.awt.OSXOffScreenSurfaceData._copyNSImagePixels (Native Method)

My C program is below. It runs on Linux, but my Mac attempts are frustrated. Here is the Linux compilation: gcc -D_REENTRANT -I $JDK/linux -I $JDK/linux/include GUIdooey.c -L $JDK/jre/lib/i386 -L $JDK/jre/lib/i386/client -ljvm -lpthread -o GUIdooey

Please help me translate that command to speak Mac (OS 10.4): This is the line I have been using up to now: gcc -framework JavaVM GUIdooey.c -o guidooey It works for all my JNI stuff until there is an attempt to create a JFrame (either directly, like the following code) or indirectly (from an already- launched Java method).

#include "/System/Library/Frameworks/JavaVM.framework/Versions/1.5.0/ Headers/jni.h" #include <string.h> #include <stdlib.h>

void bomb(int errno, char * msg) {
	printf("ERROR: %s\n", msg);
	exit(errno);
	}

int main(int argc, char *args[]) {
	jclass		jframe_cls;
	JNIEnv		*env;
	JavaVM		*jvm;
	JavaVMOption options[10];
	JavaVMInitArgs vm_args;
	jmethodID mid;
	jobject jframe;
	
	options[0].optionString= "-Djava.class.path=.";
	memset(&vm_args, 0, sizeof(vm_args));
	vm_args.version = JNI_VERSION_1_4;
	vm_args.nOptions = 1;
	vm_args.options = options;
	vm_args.ignoreUnrecognized= 0;
	long status = JNI_CreateJavaVM(&jvm, (void**)&env, &vm_args);
	if (status==JNI_ERR) bomb(1000, "cannot create JVM");

jframe_cls = (*env)->FindClass(env, "javax/swing/JFrame"); if (jframe_cls==0) bomb(1003, "cannot find JFrame class."); mid = (*env)->GetMethodID(env,jframe_cls,"<init>","(Ljava/lang/ String;)V"); if (mid==0) bomb(1004, "couldn't find constructor"); printf("found constructor\n"); jstring title= (*env)->NewStringUTF(env, "JFrame from C!"); if (title==NULL) bomb(1005,"JNI failed to get memory for string"); jframe = (*env)->NewObject(env,jframe_cls,mid,title); printf("jframe created\n"); return 0; }

The result is that the "found constructor" message AND the "jframe created" message both appear, but in BETWEEN them is a long exception traceback. sj

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