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RE: [birt-report-engine-dev] NullPointerException atExecutorManager.java 274
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It seems that you have created you own extended item "reportItem" but
failed to implement the IReportItemGeneration. Can you check your report
design to see if there exits an extended item "reportItem"?
BIRT should do NPE checking after loading the extended item executor. It
will be fixed in 2.3.
Thanks.
-Wei Yan
-----Original Message-----
From: birt-report-engine-dev-bounces@xxxxxxxxxxx
[mailto:birt-report-engine-dev-bounces@xxxxxxxxxxx] On Behalf Of Grant
Gavares
Sent: Friday, November 09, 2007 3:29 AM
To: birt-report-engine-dev@xxxxxxxxxxx
Subject: [birt-report-engine-dev] NullPointerException
atExecutorManager.java 274
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$ExecutorFactory.
visitExtendedItem(ExecutorManager.java:274)
at
org.eclipse.birt.report.engine.ir.ExtendedItemDesign.accept(ExtendedItem
Design.java:45)
at
org.eclipse.birt.report.engine.executor.ExecutorManager$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?
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