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POProblems with using a windows service to invoke a java program using JNI and LoadLibrary
 

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  1. POProblems with using a windows service to invoke a java program using JNI and LoadLibrary
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    <p>I'm creating a windows service program which invokes a java program.</p> <p>Here is part of the code, hModule is a global variable and LoadLibrary is called in ServiceStart after which it invoked invokeJVM. I manage to start the service and it runs fine, however, whenever I stop the service, it gives me an error: Windows could not stop the service on the local computer Error 1067: The windows service terminated unexpectedly</p> <p>After adding additional logging, I found that the place where the unexpected termination error occurs is the return of the invokeJVM function. When I check the event viewer it gives me some BEX error, which on googling, says that it is a stack overflow error, but I could not determine the cause of it, any idea why?</p> <pre><code>HMODULE hModule; VOID ServiceStart ( DWORD dwArgc, LPTSTR *lpszArgv ) { // Let the service control manager know that the service is // initializing. if ( !ReportStatus( SERVICE_START_PENDING, NO_ERROR, 3000 ) ) //goto cleanup; return; hModule = LoadLibrary( TEXT( "C:\\Program Files (x86)\\Java\\jre6\\bin\\client\\jvm.dll" ) ); // Create a Stop Event if ( !( hServerStopEvent = CreateEvent( NULL, TRUE, FALSE, NULL) ) ) goto cleanup; lpszJavaArgs = getJavaArgs( &amp;lpszJavaArgs, &amp;dwJLen, dwArgc, lpszArgv ); lpszAppArgs = getAppArgs( &amp;lpszAppArgs, &amp;dwALen, dwArgc, lpszArgv ); wrkdir = getWorkingDirectory( dwArgc, lpszArgv ); if ( !ReportStatus( SERVICE_RUNNING, NO_ERROR, 0 ) ) goto cleanup; // After the initialization is complete (we've checked for arguments) and // the service control manager has been told the service is running, invoke // the Java application. If clients are unable to access // the server, check the event log for messages that should indicate any errors // that may have occured while firing up Java... invokeJVM( NULL ); // Wait for the stop event to be signalled. WaitForSingleObject( hServerStopEvent, INFINITE ); cleanup: ( VOID ) ReportStatus( SERVICE_STOPPED, 0, 0 ); if ( hServerStopEvent ) CloseHandle( hServerStopEvent ); ( *vm ) -&gt; DestroyJavaVM( vm ); FreeLibraryAndExitThread( hModule, 0 ); return; } VOID invokeJVM( VOID *dummy ) { jint res; jclass cls; jmethodID mid; jstring jstr; jobjectArray args; JavaVMInitArgs vm_args; JavaVMOption options[ MAX_OPTIONS ]; jint ( *createJavaVM )( JavaVM **, void **, void * ) = ( jint ( * )( JavaVM **, void **, void * ) ) GetProcAddress( hModule, "JNI_CreateJavaVM" ); char buf[256]; jclass cls2; jmethodID mid2; UINT uIdx; if ( wrkdir ) { if ( !SetCurrentDirectory( wrkdir ) ) AddToMessageLog( TEXT( "Unable to change working directory." ) ); } if(dwJLen &gt; MAX_OPTIONS) { AddToMessageLog( TEXT( "Max. number of Java args exceeded." ) ); return; } // Assign the arguments for the JVM, such as the classpath, // RMI codebase, etc. for ( uIdx = 0; uIdx &lt; dwJLen; ++uIdx ) options[ uIdx ].optionString = lpszJavaArgs[ uIdx ]; // PROBLEM HERE vm_args.version = JNI_VERSION_1_6; vm_args.options = options; vm_args.nOptions = dwJLen; vm_args.ignoreUnrecognized = TRUE; //res = JNI_CreateJavaVM( &amp;vm, ( void ** ) &amp;env, &amp;vm_args ); res = ( *createJavaVM )( &amp;vm, ( void ** ) &amp;env, &amp;vm_args ); if ( res &lt; 0 ) { AddToMessageLog( TEXT( "Cannot create Java VM." ) ); return; } // Get the main class if ( !( cls = ( *env ) -&gt; FindClass( env, SZMAINCLASS ) ) ) { AddToMessageLog( TEXT( "Cannot find main class." ) ); return; } // Get the method ID for the class's main(String[]) function. if ( !( mid = ( *env ) -&gt; GetStaticMethodID( env, cls, "main", "([Ljava/lang/String;)V" ) ) ) { AddToMessageLog( TEXT( "Cannot find main method." ) ); return; } // If there are arguments, create an ObjectArray sized to contain the // argument list, and then scan the list, inserting each argument into // the ObjectArray. if( dwALen &gt; 0 ) { if ( !( args = ( *env ) -&gt; NewObjectArray( env, dwALen, ( *env ) -&gt; FindClass( env, "java/lang/String" ), NULL ) ) ) { AddToMessageLog( TEXT( "Out of Memory!" ) ); return; } for( uIdx = 0; uIdx &lt; dwALen; ++uIdx ) { if ( !( jstr = ( *env ) -&gt; NewStringUTF( env, lpszAppArgs[ uIdx ] ) ) ) { AddToMessageLog( TEXT( "Out of Memory!" ) ); return; } ( *env ) -&gt; SetObjectArrayElement( env, args, uIdx, jstr ); } } // Otherwise, create an empty array. This is needed to avoid // creating an overloaded main that takes no arguments in the Java // app, and then getting a different method ID to the no-argument // main() method in this invoker code. else { args = ( *env ) -&gt; NewObjectArray( env, 0, ( *env ) -&gt; FindClass( env, "java/lang/String" ), NULL ); } //Now, get the class of the java SCMEventManager if ( !( cls2 = ( *env ) -&gt; FindClass( env, SZSCMEVENTMANAGER ) ) ) { AddToMessageLog( TEXT( "Cannot find SCMEventManager class." ) ); goto finished; } //Get the method ID for SCMEventManager.getInstance() sprintf( buf, "()L%s;", SZSCMEVENTMANAGER ); if ( !( mid2 = ( *env ) -&gt; GetStaticMethodID( env, cls2, "getInstance", buf ) ) ) { AddToMessageLog( TEXT( "Cannot find SCMEventManager.getInstance." ) ); goto finished; } //Call SCMEventManager.getInstance() and save the returned object //We'll use this later on. if ( !( jobj = ( *env ) -&gt; NewGlobalRef( env, ( *env ) -&gt; CallStaticObjectMethod( env, cls2, mid2 ) ) ) ) { AddToMessageLog( TEXT( "Cannot call SCMEventManager.getInstance." ) ); goto finished; } finished: // Run the main class... ( *env ) -&gt; CallStaticVoidMethod( env, cls, mid, args ); SetConsoleCtrlHandler( logoffHandler, TRUE ); return; } </code></pre>
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    1. COThe posted source for `invokeJVM()` is somehow incomplete (for (;;) statements and at least one missing bracket somewhere)
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    2. COSeems complete to me, it compiles fine, which is the exact statement or region which you refer to?
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    3. COThe first curly bracket after `SetObjectArrayElement()` seems orphaned and the two `for (uIdx = 0; uIdx ...;)` are incomplete.
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