Bug 173836 NPE was thrown when click "Preview " button quickly twice[00]
NPE was thrown when click "Preview " button quickly twice[00] Build number: 2.2.0.v20070212-0630 Steps to reproduce: 1.open attached report 2.click "Preview" button quickly twice Expected result: Report can be previewed properly Actual result: NPE was thrown in second preview Error log: see screen shot
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/context/ViewerAttributeBean.java
{
					
					reportRunnable = BirtUtility.getRunnableFromDesignFile(
							request, this.reportDesignName, this.moduleOptions );
					if ( reportRunnable == null )
					{
						throw new ViewerException(
								ResourceConstants.GENERAL_EXCEPTION_REPORT_FILE_ERROR,
								new String[]{this.reportDesignName} );
					}
				}
				catch ( EngineException e )
				{
					this.exception = e;
				}
			}
		}
		if ( reportDocumentInstance != null )
		{
			this.documentInUrl = true;
			this.parameterMap = reportDocumentInstance.getParameterValues( );
			
			if ( !reportDocumentInstance.isComplete( ) && isReportExist )
				this.isDocumentProcessing = true;
			reportDocumentInstance.close( );
		}
		if ( reportRunnable != null )
		{
			design = new BirtViewerReportDesignHandle(
					IViewerReportDesignHandle.RPT_RUNNABLE_OBJECT,