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
{
					
					children.set( i, localChild );
					
					
					localChild.setParent( content );
					
					
					
					Collection childrenOfLocalChild = localChild.getChildren( );
					Iterator iter = child.getChildren( ).iterator( );
					while ( iter.hasNext( ) )
					{
						IContent childOfChild = (IContent) iter.next( );
						if ( !childrenOfLocalChild.contains( childOfChild ) )
						{
							childOfChild.setParent( localChild );
							childrenOfLocalChild.add( childOfChild );
						}
					}
				}
				localizeAllChildren( localChild );
			}
		}
		return content;
	}
	public Object visitPage( IPageContent page, Object value )
	{
		return page;
	}