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
continue;
						}
						
						else if ( ( displayTextParam = ParameterAccessor
								.isDisplayText( paramName ) ) != null )
						{
							paramName = getParameterName( displayTextParam,
									parameterList );
							if ( paramName != null )
							{
								this.displayTexts.put( paramName, paramValue );
							}
							continue;
						}
						
						paramName = getParameterName( paramName, parameterList );
						ParameterDefinition parameter = BirtUtility
								.findParameterDefinition( parameterList,
										paramName );
						if ( paramValue != null && parameter != null )
						{
							
							String typeVarName = configVar.getName( )
									+ "_" + IBirtConstants.PROP_TYPE; 
							ConfigVariable typeVar = handle
									.findConfigVariable( typeVarName );
							
							String dataType = ParameterDataTypeConverter
									.ConvertDataType( parameter.getDataType( ) );
							String cachedDateType = null;