Regarding the problem that the source code cannot be displayed after associating the javaee source code (tomcat source code)

Today I want to see the source code of HttpServlet. After associating the javaee source code of the tomcat version, I still can't see the source code by pressing F3. Later, I checked the information and found that I still need to download the jar package that compiles the tomcat source code. The address is as follows

There are a total of 4 jar packages in it. It seems that if any jar package is placed in the project lib directory and then built in the path, the associated tomcat source code will work.

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