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If the following error message appears during startup or access, it is because the application in Tomcat has been started twice.

Com.jspxcms.common.fulltext.LuceneException: Error during searching.; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'searcherManager' defined in class path resource [custom.xml]: Cannot resolve reference to bean' indexWriter' while setting bean property 'indexWriter';nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name' indexWriter': FactoryBean threw exception on object creation;nested exception is org.apache.lucene.util.SetOnce$AlreadySetException: The object cannot be set twice!

The reason why Tomcat applications start twice is usually due to the modification of the host and context configurations in tomcat's server.xml. For example, if the program is placed in the tomcat/webapps directory, and then context is configured again in server.xml, this will happen. Because the application in tomcat/webapps starts itself, and then tomcat detects the context configured in server.xml, it starts again. Such as:

Or

The correct way is not to modify the Host and Context configuration in the server.xml configuration file of tomcat, but to put the program as a ROOT folder in the tomcat/webapps directory.

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