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
resolution = 192;
			}
			else
			{
				resolution = 96;
			}
		}
		return resolution;
	}
	
	private String getChartFormats()
	{
		IRenderOption renderOption = context.getRenderOption( );
		String formats = renderOption.getSupportedImageFormats( );
		if ( formats != null )
		{
			return formats;
		}
		return "PNG;GIF;JPG;BMP;"; 
	}
	private String getImageCacheID( IContent content )
	{
		StringBuffer buffer = new StringBuffer( );
		buffer.append( content.getInstanceID( ).toUniqueString( ) );
		buffer.append( getChartResolution( ) );
		buffer.append( getChartFormats( ) );
		buffer.append( locale );
		return buffer.toString( );
	}