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/ChartReportItemPresentationProxy.java
assert impl != null;
		impl.setResolution( dpi );
	}
	public void setScriptContext( IReportContext context )
	{
		assert impl != null;
		impl.setScriptContext( context );
	}
	public void setSupportedImageFormats( String supportedImageFormats )
	{
		assert impl != null;
		impl.setSupportedImageFormats( supportedImageFormats );
	}
	public Object onRowSets( IBaseResultSet[] results ) throws BirtException
	{
		assert impl != null;
		return impl.onRowSets( results );
	}
	public void setExtendedItemContent( IContent content )
	{
		assert impl != null;
		impl.setExtendedItemContent( content );
		
	}
	public IReportItemPresentationInfo getPresentationConfig( )
	{
		return info;
	}
}