FindClass not able to find java class

Question

when i try to call the java code from C program it works fine.
when i call the same java code from dll . it does not see the java class.
when String class called from dll it works fine.
can you pls tell me if i am missing anything.
thanks in advance
result = JNI_CreateJavaVM(&jvm,(void **)&env, &vm_args);
printf("JVM created\n");
if(result == JNI_ERR ) {
printf("Error invoking the JVM");
exit (-1);
// cls = (*env)->FindClass(env, "SecurityPOC");
cls = (env) -> FindClass("SecurityPOC");
// cls = (env) -> FindClass("java/lang/String");

Answer 1

Hallo,
I do not quite understand your problem as you have not given enough details. Is your problem that you cannot call the JNI_CreateJavaVM() from your DLL? If you are using Java 1.4 then that will not work, see Bug Nr. 4920112. (http://developer.java.sun.com/developer/bugParade/bugs/4920112.html)
If you are using V1.3, then it should work but you need to set up the JVM options before you call JNI_CreateJavaVM(), regardless of whether you create the JVM in your program or in a dll. For example:
char classpath[2000];
char * USER_CLASSPATH = "<myclasspath>";
JavaVMInitArgs vm_argsNew;
vm_argsNew.version = JNI_VERSION_1_2;
// JIT Compiler off
JavaVMOption options[3];
options[0].optionString = "-verbose:gc";
sprintf (classpath, "-Djava.class.path=%s", USER_CLASSPATH);
options[1].optionString = classpath;
options[2].optionString = "-Djava.compiler=NONE";
vm_argsNew.options = options;
vm_argsNew.nOptions = 3;
vm_argsNew.ignoreUnrecognized = JNI_TRUE;
/* Create the Java VM */
void ** ppEnvVoid = reinterpret_cast <void **> (&a_pJNIenv);
jint rc = JNI_CreateJavaVM(&a_pjvm, ppEnvVoid, &vm_argsNew);
if (rc < 0)
good luck
David Singleton
[email protected]