Bug 211175 ClassCastException thrown when implementing IReportItemQuery
When implementing IReportItemQuery's method, public IDataQueryDefinition[] createReportQueries(IDataQueryDefinition parent) throws BirtException, even if the impl method returns IDataQueryDefinition[], ClassCastException will be thrown during preview, the error log is as follows: java.lang.ClassCastException: [Lorg.eclipse.birt.data.engine.api.IDataQueryDefinition; at org.eclipse.birt.report.engine.executor.ExtendedGenerateExecutor.generateContent(ExtendedGenerateExecutor.java:91) at org.eclipse.birt.report.engine.executor.ExtendedGenerateExecutor.execute(ExtendedGenerateExecutor.java:72) at org.eclipse.birt.report.engine.executor.ExtendedItemExecutor.execute(ExtendedItemExecutor.java:60) at org.eclipse.birt.report.engine.internal.executor.dup.SuppressDuplicateItemExecutor.execute(SuppressDuplicateItemExecutor.java:42) If the method returns IBaseQueryDefinition[], it's ok. Look at the engine code, there's something wrong of class casting when generating content.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/presentation/LocalizedContentVisitor.java
protected TextTemplate parseTemplate( String text )
	{
		SoftReference templateRef = (SoftReference) templates.get( text );
		TextTemplate template = null;
		if ( templateRef != null )
		{
			template = (TextTemplate) templateRef.get( );
			if ( template != null )
			{
				return template;
			}
		}
		try
		{
			template = new org.eclipse.birt.core.template.TemplateParser( )
					.parse( text );
			templateRef = new SoftReference( template );
			templates.put( text, templateRef );
		}
		catch ( Exception ex )
		{
			context
					.addException( new EngineException( ex
							.getLocalizedMessage( ) ) );
			logger.log( Level.WARNING, ex.getMessage( ), ex );
		}
		return template;
	}
	String executeTemplate( TextTemplate template, HashMap values )