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Steve Dussinger
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 Posted: Fri May 21, 2004 1:53 am Post subject: Simple JNI program fails |
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Extracting the following C++ code (with some minor mods) from other
posts in this group, I was hoping to at least be able to create a JVM
and grab a class which is pretty much guaranteed to exist. Well, I
can't seem to make the thing work.
Running under the debugger, I can see the JVM get created, but when I
try to find the System class, I get a zero response.
Now near as I can tell, System should always be available, if the JVM
has been initialized at all, but I can't seem to get it to work.
Anyone have any ideas?
Code follows----------------------------
JNIEnv *env;
JavaVM *jvm;
JavaVMInitArgs vm_args;
JavaVMOption options[1];
jint res;
jclass cls;
jmethodID mid;
jstring jstr;
jobjectArray args;
long status;
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;
status = JNI_CreateJavaVM(&jvm, (void**)&env, &vm_args);
if(status == JNI_ERR) {
printf("Error creating VMn");
}
cls = env->FindClass("System");
if (cls == 0) {
fprintf(stderr, "Can't find System classn");
exit(1);
}
-----------------------------------
BTW, it's running on Windows XP, the C++ is written using Visual
Studio.NET 2003 (v 7.1) using the Sun jdk1.4.2_04 VM...
Thanx for any help...
--Steve
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Gordon Beaton
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| Posted: Fri May 21, 2004 9:23 am Post subject: Re: Simple JNI program fails |
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On 20 May 2004 18:53:18 -0700, Steve Dussinger wrote:
| Quote: | Extracting the following C++ code (with some minor mods) from other
posts in this group, I was hoping to at least be able to create a
JVM and grab a class which is pretty much guaranteed to exist. Well,
I can't seem to make the thing work.
Running under the debugger, I can see the JVM get created, but when
I try to find the System class, I get a zero response.
|
[...]
| Quote: | cls = env->FindClass("System");
|
Try this instead:
cls = env->FindClass("java/lang/System");
if (!cls) {
if (env->ExceptionOcurred()) {
env->ExceptionDescribe();
}
}
/gordon
--
[ do not email me copies of your followups ]
g o r d o n + n e w s @ b a l d e r 1 3 . s e
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