[birt-report-engine-dev] NullPointerException at ExecutorManager.java 27

[Grant Gavares <gavares@xxxxxxxxxx>]

Any report that I execute results in a NullPointer exception at ExecutorManager.java: 274.

Report Engine: 2.2.1
Container: Jetty

My Engine is initialized as follows:

    EngineConfig config = new EngineConfig();
    config.setEngineHome( "" );
    config.setLogConfig(null, Level.ALL );
    IPlatformContext servletContext = new PlatformServletContext( context );
    config.setPlatformContext(servletContext);
    config.setResourcePath( BIRT_VIEWER_SCRIPTLIB_DIR );
    config.setProperty( "BIRT_VIEWER_SCRIPTLIB_DIR", BIRT_VIEWER_SCRIPTLIB_DIR );
    Platform.startup(config);
    IReportEngineFactory factory = (IReportEngineFactory) Platform.createFactoryObject(  IReportEngineFactory.EXTENSION_REPORT_ENGINE_FACTORY );
    engine = factory.createReportEngine(config);

The last line executed by my code is:

    runTask.run( docFileName );

I can see that the run task is creating an output file and data is being written to it. The stacktrace from the BIRT Engine:


org.eclipse.birt.data.engine.impl.DataEngineImpl <init>
Data Engine starts up
org.eclipse.birt.report.engine.extension.internal.ExtensionManager createReportItemExecutor
WARNING: Create Report Item Executor fail, Config not exist class: reportItem
org.eclipse.birt.report.engine.api.impl.RunTask doRun
SEVERE: An error happened while running the report. Cause:
java.lang.NullPointerException
        at org.eclipse.birt.report.engine.executor.ExecutorManager$ExecutorFactory.visitExtendedItem(ExecutorManager.java:274)
        at org.eclipse.birt.report.engine.ir.ExtendedItemDesign.accept(ExtendedItemDesign.java:45)
        at org.eclipse.birt.report.engine.executor.ExecutorManager$ExecutorFactory.createExecutor(ExecutorManager.java:246)



Looking at ExecutorManager:274

   273: IReportItemExecutor executor = ExtensionManager.getInstance( ).createReportItemExecutor( ExecutorManager.this, tagName );
   274: executor.setContext( executorContext );

It appears that the null pointer exception is caused by callint setContext on a null IReportItemExecutor object.

Looking into ExtensionManager.createReportItemExecutor:

    140:    IConfigurationElement config = (IConfigurationElement) generationExtensions.get( itemType );
    142:    if ( config != null )
    143         {
    144             Object object = createObject( config, "class" ); //$NON-NLS-1$
    145             if ( object instanceof IReportItemExecutor )
    146             {
    147                 return (IReportItemExecutor) object;
    148             }
    149             else if ( object instanceof IReportItemGeneration )
    150             {
    151                 return new ExtendedGenerateExecutor( manager,
    152                         (IReportItemGeneration) object );
    153             }
    154             logger
    155                     .log(
    156                             Level.WARNING,
    157                             "Create Report Item Executor fail, Config not exist class: {0}", config.getName( ) ); //$NON-NLS-1$
    158             return null;
    159         }


The last log line above is where I was getting the error I pasted in my previous post. That means that this method is returning null.(  Perhaps it would be good practice for ExecutorManager to check for null after its call to ExtensionManager in order to avoid the NullPointerException? ) So why am I getting null from ExtensionManager? Looking into the variable *generationExtensions*, its a HashMap thats populated in the method ExtensionManager.loadGenerationExtensionDefns. Here is the body of this method:
    337     protected void loadGenerationExtensionDefns()
    338     {
    339         IExtensionRegistry registry = Platform.getExtensionRegistry();
    340         IExtensionPoint extPoint = registry.getExtensionPoint(EXTENSION_POINT_GENERATION);
    341         if(extPoint==null)
    342             return;
    343
    344         IExtension[] exts = extPoint.getExtensions();
    345         logger.log(Level.FINE, "Start load extension point: {0}", EXTENSION_POINT_GENERATION); //$NON-NLS-1$
    346         for (int i = 0; i < exts.length; i++)
    347         {
    348             IConfigurationElement[] configs = exts[i].getConfigurationElements();
    349             for (int j = 0; j < configs.length; j++)
    350             {
    351                 String itemName = configs[j].getAttribute("name"); //$NON-NLS-1$
    352                 generationExtensions.put(itemName, configs[j]);
    353                 logger.log(Level.FINE, "Load generation extension: {0}", itemName); //$NON-NLS-1$
    354             }
    355         }
    356     }


So it looks like something is missing ( from the error above, I'd say "reportItem" ) from the exts array.  

Any ideas?