JNI FindClass Error: Using the Invocation API from visual C++

Question

I am using JNI invocation api in microsoft visual c++ to invoke java. When I use the FindClass method, I get a return value of 0. I have verified that the class "a" exists and believe have set the java class path appropriately. A valid jvm and jenv are created. The program fails at the FindClass call and returns 0.
std::string classPath = "c:\\work\\java;C:\\j2sdk1.4.2_08;C:\\j2sdk1.4.2_08\\bin;C:\\j2sdk1.4.2_08\\lib";
     vmArgs.classpath = classpath;
     jint res = JNI_CreateJavaVM(&jvm, (void**)(&jenv), &vmArgs);
     if (res < 0)
          cout << "Error!! Cannot create jvm" << endl;
jclass jFixEngineClass1 = jenv->FindClass("a");
     if (jFixEngineClass1 == 0)
          cout << "Error could not find a class" << endl;
     else
          cout << "a class found" << endl;
thanks in advance,
hcg

Answer 1

Jschell,
Thanks for your help.
I found the error. I was using JDK1_1InitArgs for my vm_args. Since, I am using JDK 1.4, the classpath I was setting was not getting picked up. I changed the vm_args type as in the code below and it worked.
JavaVMInitArgs vmArgs;
     JavaVMOption options[1];
     char classPathDef[1024];classPathDef[0] = '\0';
     sprintf(classPathDef, "%s", "-Djava.class.path=");
     sprintf(classpath, "%s%s", classPathDef, NYSE_FIX::userClassPath.c_str());
     options[0].optionString = classpath;
     cout << "Option string is:" << options[0].optionString << endl;
vmArgs.version = 0x00010004;
vmArgs.options = options;
vmArgs.nOptions = 1;
vmArgs.ignoreUnrecognized = JNI_TRUE;
     jint ret = JNI_GetDefaultJavaVMInitArgs(&vmArgs);