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 ( typeVar != null )
								cachedDateType = typeVar.getValue( );
							
							if ( cachedDateType == null
									|| !cachedDateType
											.equalsIgnoreCase( dataType ) )
								continue;
							
							String exprVarName = configVar.getName( ) + "_" 
									+ IBirtConstants.PROP_EXPR;
							ConfigVariable exprVar = handle
									.findConfigVariable( exprVarName );
							String cachedExpr = null;
							if ( exprVar != null )
								cachedExpr = exprVar.getValue( );
							if ( cachedExpr == null )
								cachedExpr = ""; 
							String expr = parameter.getValueExpr( );
							if ( expr == null )
								expr = ""; 
							
							if ( !cachedExpr.equals( expr ) )
								continue;
							this.configMap.put( paramName, paramValue );
						}
					}
				}
				handle.close( );
			}
		}