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
catch ( Exception e )
		{
		}
	}
	/**
	 * if parameter existed in config file, return the correct parameter name
	 * 
	 * @param configVarName
	 *            String
	 * @param parameterList
	 *            Collection
	 * @return String
	 */
	private String getParameterName( String configVarName,
			Collection parameterList ) throws ReportServiceException
	{
		String paramName = null;
		if ( parameterList != null )
		{
			for ( Iterator iter = parameterList.iterator( ); iter.hasNext( ); )
			{
				ParameterDefinition parameter = (ParameterDefinition) iter
						.next( );
				
				String curName = null;
				if ( parameter != null && parameter.getName( ) != null )
				{
					curName = parameter.getName( ) + "_" + parameter.getId( ); 
				}