When using idea, Tomcat can’t start normally, error prompt: org.apache.catalina . core.StandardContext.startInternal Error listener start. No more detailed error information.
Google has a plan to record Tomcat log details: create a new one in the project resource directory logging.properties File, enter the following into the file:

  handlers = org.apache.juli.FileHandler,java.util.logging.ConsoleHandler 
 org.apache.juli.FileHandler.level = FINE 
 org.apache.juli.FileHandler.directory = ${catalina.base}/logs 
 org.apache.juli.FileHandler.prefix = error-debug.

java.util.logging.ConsoleHandler.level = FINE 
 java.util.logging.ConsoleHandler.formatter = java.util.logging.SimpleFormatter

Restart tomcat, you will find more detailed error information under server.
My error message here:
caused by: org.springframework.context . annotation.ConflictingBeanDefinitionException : Annotation-specified bean name ‘newsManagerController’ for bean class [ com.qf.official . controller.NewsManagerController ] conflicts with existing, non-compatible bean definition of same name and class [ com.qf.bookbar . news.controller.NewsManagerController ].
because the name of a class has been modified before, which is duplicate with the class name in the system, the problem is solved by modifying the class name.