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
{
					text = value.toString( );
				}
			}
		}
		
		if ( text != null )
		{
			data.setText( text );
		}
		else
		{
			data.setText( "" ); 
		}
	}
	/**
	 * handle the label.
	 * 
	 * @param label
	 *            label content
	 */
	public Object visitLabel( ILabelContent label, Object value )
	{
		handleOnRender( label );
		processLabel( label );
		return label;
	}
	/**
	 * process the label content
	 *