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
{
				
				if ( this.parametersAsString.containsKey( paramName ) )
				{
					params.put( paramName, null );
				}
				else
				{
					
					params.put( paramName, this.defaultValues.get( paramName ) );
				}
			}
		}
		return params;
	}
	/**
	 * Returns parameter default values map
	 * 
	 * @param design
	 * @param parameterList
	 * @param request
	 * @param options
	 * @return
	 * @throws ReportServiceException
	 */
	protected Map getDefaultValues( IViewerReportDesignHandle design,
			Collection parameterList, HttpServletRequest request,
			InputOptions options ) throws ReportServiceException
	{
		Map map = new HashMap( );