Problem invoking JVM from Windows

Question

Hi all,
I tried to create a JVM instance as laid out in the examples. The JVM is never getting created. I am using Visual C++ (I need to, when the code works I will be creating a DLL that is an addon to someother piece of software).
I have posted the code below::
#include "stdafx.h"
#include "invoke2.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
// The one and only application object
CWinApp theApp;
using namespace std;
int main(void)
     int nRetCode = 0;
     // initialize MFC and print and error on failure
     if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0))
          // TODO: change error code to suit your needs
          cerr << _T("Fatal Error: MFC initialization failed") << endl;
          nRetCode = 1;
     else
          JNIEnv *env;               /* The java vm environment                                        */
          JavaVM *jvm;               /* The actual jvm                                                  */
          CString fname;               /* The file name of the generated intermediate obj file */
          JDK1_1InitArgs vm_args;
          jint res;
          jint vmavail;
          jclass cls;
          jmethodID mid;
          //char classpath[4096];
          bool viewerready;          /* is this java viewer valid?                                   */
          vm_args.classpath=".";
          vm_args.version = JNI_VERSION_1_4;
          vmavail=JNI_GetDefaultJavaVMInitArgs(&vm_args);
          if(vmavail < 0)
               AfxMessageBox(" That VM version is not available. ",100,100);
               viewerready=false;
               jvm=NULL;
               env=NULL;
          else
               vm_args.classpath=".";
               res = JNI_CreateJavaVM(&jvm,(void **) &env,&vm_args);
               if(res < 0)
                    AfxMessageBox("Could not create JVM instance. \n Check your classpath. \n 3D viewer will not be available. ",100,100);
                    jvm=NULL;
                    env=NULL;
                    viewerready=false;
               else
                    cls = env->FindClass("OBJViewer");
                    if(cls == 0)
                         AfxMessageBox("Can't find the java OBJViewer class. ",100,100);
                         viewerready=false;
                    mid = env->GetMethodID(cls, "OBJViewer", "");
                    if(mid == 0)
                         AfxMessageBox(" java class OBJViewer has no constructor OBJViewer() ");
                         viewerready=false;
                    env->CallStaticVoidMethod(cls, mid);
     return nRetCode;
}

Answer 1

Hey guys :)
I incorporated the changes suggested by David and "reberst" and then did the stuff told by "LathaDhamo".
Now I am able to invoke the VM without problems and my test program runs and displays windows and takes in input etc.. Thank you, Thank you, Thank you!!
But now, I noticed that all this happens only when I am in debug mode in VC++ and step thru the program. When my external program loads the DLL I created automatically, I get the error message that the "JavaTest" class was not found. This will lead to errors when I deploy the DLL or package it for others. How do I ensure that the class is always found? What do I have to do?
I am sorry for being so amtuerish and asking so many questions. This is my first time using JNI from the native side.
Thank you,
vijai.
JavaOBJViewer::JavaOBJViewer(void)
     memset(&args, 0, sizeof(args));
     args.version = JNI_VERSION_1_4;
     args.nOptions = 2;
     options[0].optionString = "-Djava.class.path=.";
     options[1].optionString = "-Djava.library.path=.";
     args.options = options;
     args.ignoreUnrecognized = JNI_TRUE;
     res=JNI_CreateJavaVM(&jvm, (void **)&env, &args);
     if(res < 0)
          AfxMessageBox(" The JavaVM could not be initialized. \n Refer to the documentation on environment variable settings. \n 3D Viewer will not be available while modeling. ");
          jvm=NULL;
          env=NULL;
          viewerready=false;
     else
          cls = env->FindClass("JavaTest");
          if(cls == NULL)
               AfxMessageBox("Can't find the java JavaTest class. \n 3D viewer will not be available while modeling. ",100,100);
               viewerready=false;
          else
              mid = env->GetStaticMethodID(cls, "main", "([Ljava/lang/String;)V");
               if(mid == NULL)
                    AfxMessageBox(" java class JavaTest has no main method. ");
                    viewerready=false;
               else
                    tempf = env->NewStringUTF("testenvp.obj");
                    logf = env->NewStringUTF("java_viewer_log.txt");
                    if((tempf == NULL) || (logf == NULL))
                         AfxMessageBox("The Java VM had insufficient memory to create the argument array. ",100,100);
                    else
                         mainargs = env->NewObjectArray(2,env->FindClass("java/lang/String"), logf);
                         if(mainargs == NULL)
                              AfxMessageBox("The Java VM had insufficient memory to create the argument array. ",100,100);
                         else
                              env->SetObjectArrayElement(mainargs,2,tempf);
                              env->CallStaticVoidMethod(cls,mid,mainargs);
                              jthrowable exc;
                              exc = env->ExceptionOccurred();
                              if(exc)
                                   AfxMessageBox(" An unknown exception occurred. ",100,100);
                                   viewerready=false;
                              else
                                   viewerready=true;
}