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
if ( rawValue instanceof byte[] )
			{
				IImageContent imageContent = reportContent
						.createImageContent( foreignContent );
				imageContent.setImageSource( IImageContent.IMAGE_EXPRESSION );
				imageContent.setData( (byte[]) rawValue );
				processImage( imageContent );
				return imageContent;
			}
		}
		
		if ( IForeignContent.TEXT_TYPE.equals( rawFormat ) )
		{
			handleOnRender( foreignContent );
			ITextContent textContent = reportContent
					.createDataContent( foreignContent );
			textContent.setText( rawValue == null ? "" : rawValue.toString( ) ); 
			return textContent;
		}
		
		if ( IForeignContent.HTML_TYPE.equals( rawFormat ) )
		{
			handleOnRender( foreignContent );
			String key = foreignContent.getRawKey( );
			if (key != null)
			{
				String text = localize( foreignContent, key, null);
				if (text != null)
				{
					foreignContent.setRawValue(  text );