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.
chart/org.eclipse.birt.chart.reportitem/src/org/eclipse/birt/chart/reportitem/ChartReportItemGenerationProxy.java
{
	private IReportItemGeneration impl;
	private IReportItemGenerationInfo info;
	
	public void init( IReportItemGenerationInfo info )
	{
		if ( info == null )
		{
			throw new NullPointerException( );
		}
		this.info = info;
		setModelObject( info.getModelObject( ) );
		setApplicationClassLoader( info.getApplicationClassLoader( ) );
		setScriptContext( info.getReportContext( ) );
		setReportQueries( info.getReportQueries( ) );
		setExtendedItemContent( info.getExtendedItemContent( ) );
	}
	
	private IReportItemGeneration createImpl( ExtendedItemHandle modelHandle )
	{
		return new ChartReportItemGenerationImpl( );
	}
	public boolean needSerialization( )
	{
		assert impl != null;
		return impl.needSerialization( );