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 ( "false".equalsIgnoreCase( showParameterPage ) ) 
			{
				return false;
			}
			if ( "true".equalsIgnoreCase( showParameterPage ) ) 
			{
				return true;
			}
		}
		return this.missingParameter;
	}
	/**
	 * parse paramenters from config file.
	 * 
	 * @param request
	 *            HttpServletRequest
	 * @param parameterList
	 *            Collection
	 * @return
	 */
	protected void parseConfigVars( HttpServletRequest request,
			Collection parameterList )
	{
		this.configMap = new HashMap( );
		if ( this.displayTexts == null )
			this.displayTexts = new HashMap( );
		
		String reportConfigName = ParameterAccessor
				.getConfigFileName( this.reportDesignName );
		if ( reportConfigName == null )