launch java(swing) applications from c/c++ on mac os x

[pratik.ganguly]

I want to launch a java application, which has lots of swing stuff in
it, as also underlying algorithms running. I work on Mac OS X 10.3.8,
and have Java 1.4.2_05(latest). I tried to launch AWT components like
Frame,Panel, etc and it worked fine, but swing won't. I discovered that
the code by default loads Java 1.3.1, and JNI 1.2, and hence no swing
is supported. Can someone help me out? Thanks in advance. Here is a
snippet of the native(c) code:

JNIEnv* create_vm() {
JavaVM* jvm;
JNIEnv* env;
JavaVMInitArgs args;
jint jintVMStartupReturnValue;
//JavaVMOption options[1];
JavaVMOption options[15];

args.version = JNI_VERSION_1_4;
args.nOptions = 15;
options[0].optionString =
"-Djava.class.path=/Users/avisere12/Desktop";
options[1].optionString =
"-Dsun.boot.library.path=/System/Library/Frameworks/JavaVM.framework/Versions/1.4.2/Libraries";
options[2].optionString = "-Xms16M";
options[3].optionString = "-Xmx512M";
options[4].optionString = "-Duser.dir=/Users/avisere12/Desktop";
options[5].optionString =
"-Djava.home=/System/Library/Frameworks/JavaVM.framework/Versions/1.4.2/Home";
options[6].optionString =
"-Djava.ext.dirs=/Library/Java/Extensions:/System/Library/Java/Extensions:/System/Library/Frameworks/JavaVM.framework/Versions/1.4.2/Home/lib/ext";

options[7].optionString =
"-Dsun.boot.class.path=/System/Library/Frameworks/JavaVM.framework/Versions/1.4.2/Classes/classes.jar:/System/Library/Frameworks/JavaVM.framework/Versions/1.4.2/Classes/ui.jar:/System/Library/Frameworks/JavaVM.framework/Versions/1.4.2/Classes/laf.jar:/System/Library/Frameworks/JavaVM.framework/Versions/1.4.2/Classes/sunrsasign.jar:/System/Library/Frameworks/JavaVM.framework/Versions/1.4.2/Classes/jsse.jar:/System/Library/Frameworks/JavaVM.framework/Versions/1.4.2/Classes/jce.jar:/System/Library/Frameworks/JavaVM.framework/Versions/1.4.2/Classes/charsets.jar";
options[8].optionString = "-Djava.runtime.version=1.4.2_05-141.4";
options[9].optionString =
"-Djava.awt.graphicsenv=apple.awt.CGraphicsEnvironment";
options[10].optionString =
"-Djava.endorsed.dirs=/System/Library/Frameworks/JavaVM.framework/Versions/1.4.2/Home/lib/endorsed";
options[11].optionString = "-Djava.vm.info=mixed mode";
options[12].optionString = "-Djava.version=1.4.2_05";
options[13].optionString = "-Djava.vm.version=1.4.2-38";
options[14].optionString = "-Dawt.nativeDoubleBuffering=true";
args.options = options;
args.ignoreUnrecognized = JNI_TRUE;
jintVMStartupReturnValue = JNI_CreateJavaVM(&jvm, &env, &args);

return env;
}

void invoke_class(JNIEnv* env) {
jclass helloWorldClass;
jmethodID mainMethod;
jobjectArray applicationArgs;
jstring applicationArg0;

helloWorldClass = env->FindClass("com/mypack/pack/MyJava");

if(helloWorldClass == 0){
printf("Class not found\n");
fflush(stdout);
}
else{
printf("Class found and about to be loaded\n");
fflush(stdout);
}

mainMethod = env->GetStaticMethodID(helloWorldClass, "main",
"([Ljava/lang/StringV");

applicationArgs = env->NewObjectArray(1,
env->FindClass("java/lang/String"), NULL);
applicationArg0 = env->NewStringUTF("yahoooooooo");

env->SetObjectArrayElement(applicationArgs, 0, applicationArg0);

env->CallStaticVoidMethod(helloWorldClass, mainMethod,
applicationArgs);
}


int main(int argc, char **argv) {
JNIEnv* env = create_vm();
invoke_class( env );
}
Here is the error which I get, more so when i try to run JNI 1.4:

2005-03-22 11:24:56.399 myapp[628] Apple AWT Java VM was loaded on
first thread -- can't start AWT.
Class not found
Bus error



I tried providing various optons as vm arguments, but got the same
errors as above.

 

[Steve W. Jackson]

I want to launch a java application, which has lots of swing stuff in
it, as also underlying algorithms running. I work on Mac OS X 10.3.8,
and have Java 1.4.2_05(latest). I tried to launch AWT components like
Frame,Panel, etc and it worked fine, but swing won't. I discovered that
the code by default loads Java 1.3.1, and JNI 1.2, and hence no swing
is supported. Can someone help me out? Thanks in advance. Here is a
snippet of the native(c) code:

JNIEnv* create_vm() {
JavaVM* jvm;
JNIEnv* env;
JavaVMInitArgs args;
jint jintVMStartupReturnValue;
//JavaVMOption options[1];
JavaVMOption options[15];

args.version = JNI_VERSION_1_4;
args.nOptions = 15;
options[0].optionString =
"-Djava.class.path=/Users/avisere12/Desktop";
options[1].optionString =
"-Dsun.boot.library.path=/System/Library/Frameworks/JavaVM.framework/Versions/
1.4.2/Libraries";
options[2].optionString = "-Xms16M";
options[3].optionString = "-Xmx512M";
options[4].optionString = "-Duser.dir=/Users/avisere12/Desktop";
options[5].optionString =
"-Djava.home=/System/Library/Frameworks/JavaVM.framework/Versions/1.4.2/Home";
options[6].optionString =
"-Djava.ext.dirs=/Library/Java/Extensions:/System/Library/Java/Extensions:/Sys
tem/Library/Frameworks/JavaVM.framework/Versions/1.4.2/Home/lib/ext";

options[7].optionString =
"-Dsun.boot.class.path=/System/Library/Frameworks/JavaVM.framework/Versions/1.
4.2/Classes/classes.jar:/System/Library/Frameworks/JavaVM.framework/Versions/1
.4.2/Classes/ui.jar:/System/Library/Frameworks/JavaVM.framework/Versions/1.4.2
/Classes/laf.jar:/System/Library/Frameworks/JavaVM.framework/Versions/1.4.2/Cl
asses/sunrsasign.jar:/System/Library/Frameworks/JavaVM.framework/Versions/1.4.
2/Classes/jsse.jar:/System/Library/Frameworks/JavaVM.framework/Versions/1.4.2/
Classes/jce.jar:/System/Library/Frameworks/JavaVM.framework/Versions/1.4.2/Cla
sses/charsets.jar";
options[8].optionString = "-Djava.runtime.version=1.4.2_05-141.4";
options[9].optionString =
"-Djava.awt.graphicsenv=apple.awt.CGraphicsEnvironment";
options[10].optionString =
"-Djava.endorsed.dirs=/System/Library/Frameworks/JavaVM.framework/Versions/1.4
.2/Home/lib/endorsed";
options[11].optionString = "-Djava.vm.info=mixed mode";
options[12].optionString = "-Djava.version=1.4.2_05";
options[13].optionString = "-Djava.vm.version=1.4.2-38";
options[14].optionString = "-Dawt.nativeDoubleBuffering=true";
args.options = options;
args.ignoreUnrecognized = JNI_TRUE;
jintVMStartupReturnValue = JNI_CreateJavaVM(&jvm, &env, &args);

return env;
}

void invoke_class(JNIEnv* env) {
jclass helloWorldClass;
jmethodID mainMethod;
jobjectArray applicationArgs;
jstring applicationArg0;

helloWorldClass = env->FindClass("com/mypack/pack/MyJava");

if(helloWorldClass == 0){
printf("Class not found\n");
fflush(stdout);
}
else{
printf("Class found and about to be loaded\n");
fflush(stdout);
}

mainMethod = env->GetStaticMethodID(helloWorldClass, "main",
"([Ljava/lang/StringV");

applicationArgs = env->NewObjectArray(1,
env->FindClass("java/lang/String"), NULL);
applicationArg0 = env->NewStringUTF("yahoooooooo");

env->SetObjectArrayElement(applicationArgs, 0, applicationArg0);

env->CallStaticVoidMethod(helloWorldClass, mainMethod,
applicationArgs);
}


int main(int argc, char **argv) {
JNIEnv* env = create_vm();
invoke_class( env );
}
Here is the error which I get, more so when i try to run JNI 1.4:

2005-03-22 11:24:56.399 myapp[628] Apple AWT Java VM was loaded on
first thread -- can't start AWT.
Class not found
Bus error



I tried providing various optons as vm arguments, but got the same
errors as above.

I haven't used JNI in OS X and thus can't speak to your code or the
specific problem solution. But wherever you heard that there's no Swing
in Apple's Java 1.3.1 was dead wrong. Apple's Java releases, other than
any bugs or documented limitations/differences, are essentially
compatible with Sun's releases of the same number. Apple's 1.3.1 does
in fact support Swing.

= Steve =