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/extension/internal/ReportItemPresentationInfo.java
package org.eclipse.birt.report.engine.extension.internal;
import java.util.Locale;
import org.eclipse.birt.data.engine.api.IBaseQueryDefinition;
import org.eclipse.birt.report.engine.api.IHTMLActionHandler;
import org.eclipse.birt.report.engine.api.script.IReportContext;
import org.eclipse.birt.report.engine.content.IContent;
import org.eclipse.birt.report.engine.content.IStyle;
import org.eclipse.birt.report.engine.extension.IReportItemPresentationInfo;
import org.eclipse.birt.report.model.api.ExtendedItemHandle;
public class ReportItemPresentationInfo implements IReportItemPresentationInfo
{
	private ExtendedItemHandle modelHandle = null;
	private IHTMLActionHandler ah = null;
	private ClassLoader loader = null;
	private IContent content = null;
	private String outputFormat = null;
	private IBaseQueryDefinition[] queries = null;
	private int dpi;