SV: How do I convert Java application to EXE ? (off topic)

[Christian Damsgaard]

Do it with help of JNI - Java Native Interface.

You can from a C program load and initialize a JVM and then tell it to load
and execute what class you want.

I bought a book on the subject (somebody borrowed it friday but I will get
back thursday) which was quite good. The only problem with the book was
that it targeted jdk 1.1 and not 1.2, but I got it working anyway.

The following code has been used in my Windows NT Java Service:

void JavaService::serviceThread()
{
        JNIEnv *jniEnv;
        JavaVMInitArgs vm_args;
        JavaVMOption options[6];
        string javadblogString                  = "-Djavadblog=" + m_javadblog;
        string classpathOption                  = "-Djava.class.path=" + m_classpath;
        string initialHeapSizeOption            = "-Xms" + m_initialHeapSize + "m";
        string maxHeapSizeOption                = "-Xmx" + m_maxHeapSize +"m";

        options[0].optionString = "-Djava.compiler=NONE";
        options[1].optionString = (char *) javadblogString.c_str();
        options[2].optionString = "vfprintf";
        options[2].extraInfo = NULL;
        options[3].optionString = (char *) classpathOption.c_str();
        options[4].optionString = (char *) initialHeapSizeOption.c_str();
        options[5].optionString = (char *) maxHeapSizeOption.c_str();

        vm_args.version = JNI_VERSION_1_2;
        vm_args.options = options;
        vm_args.nOptions = 6;
        vm_args.ignoreUnrecognized = JNI_FALSE;

        // Create the virtual machine
        if(JNI_CreateJavaVM(&m_javaVM,(void **)&jniEnv,&vm_args) < 0)
        {
                m_errorState = JSE_UnableToCreatingJavaVM;
                m_currentState = JSS_Stopped;

                SetEvent(m_startEventSemaphore);

                return;
        }

        // Locate the class
        string localClassname = dotsToSlashes(m_classname);

        jclass clazz = jniEnv -> FindClass((char *)localClassname.c_str());
        if(clazz == 0)
        {
                m_javaVM -> DestroyJavaVM();

                m_errorState = JSE_UnableToFindClass;
                m_currentState = JSS_Stopped;

                SetEvent(m_startEventSemaphore);

                return;
        }

        // Locate 'startService' method of class
        jmethodID mid;
        if( (mid = jniEnv -> GetStaticMethodID(clazz,"startServiceManager","()V"))
== 0)
        {
                m_javaVM -> DestroyJavaVM();

                m_errorState = JSE_UnableToFindMethodID;
                m_currentState = JSS_Stopped;

                SetEvent(m_startEventSemaphore);

                return;
        }

        // Invoke 'startService' method of class
        jniEnv -> CallStaticVoidMethod(clazz,mid,NULL);

        // Change state to running
        m_currentState = JSS_Running;

        // Signal that we are finished initialize
        SetEvent(m_startEventSemaphore);

        // Sleep until we are signaled to stop
        WaitForSingleObject(m_stopEventSemaphore,INFINITE);

        // Locate 'stopService' method of class
        if( (mid = jniEnv -> GetStaticMethodID(clazz,"stopServiceManager","()V"))
== 0)
        {
                m_javaVM -> DestroyJavaVM();
                m_errorState = JSE_UnableToFindMethodID;
                m_currentState = JSS_Stopped;
                return;
        }

        // Invoke 'stopService' method of claass
        jniEnv -> CallStaticVoidMethod(clazz,mid,NULL);

        // Terminate the virtual machine
        m_javaVM -> DestroyJavaVM();

        // Change state to stopped
        m_currentState = JSS_Stopped;

        SetEvent(m_stoppedEventSemaphore);
}

Best regards
Christian

-----Oprindelig meddelelse-----
Fra:    Sanjay [SMTP:[EMAIL PROTECTED]]
Sendt:  24. november 1999 08:34
Til:    [EMAIL PROTECTED]
Emne:   How do I convert Java application to EXE  ? (off topic)

How can I convert my Java application (total 3 class files) to a EXE file
on WindowsNT ?

Sorry for the off-topic Qs, but since I could not get the information
anywhere else I thought to put it up here......Please help me out
guys......

Thanx a lot,

Sanjay Karanjkar
Systems Engg.
Tata Infotech Ltd.

___________________________________________________________________________
To unsubscribe, send email to [EMAIL PROTECTED] and include in the body
of the message "signoff SERVLET-INTEREST".

Archives: http://archives.java.sun.com/archives/servlet-interest.html
Resources: http://java.sun.com/products/servlet/external-resources.html
LISTSERV Help: http://www.lsoft.com/manuals/user/user.html

___________________________________________________________________________
To unsubscribe, send email to [EMAIL PROTECTED] and include in the body
of the message "signoff SERVLET-INTEREST".

Archives: http://archives.java.sun.com/archives/servlet-interest.html
Resources: http://java.sun.com/products/servlet/external-resources.html
LISTSERV Help: http://www.lsoft.com/manuals/user/user.html