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The short answer is to add the following options when the JVM is started:
-Xdebug -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n
There are a number of ways you can do this depending on how you normally start Tomcat:

• If you run Tomcat using service wrapper, check the documentation for the service to determine how to add the above JVM options before any other options
• Set environment variables JPDA_ADDRESS=8000 and JPDA_TRANSPORT=dt_socket and then start tomcat using catalina jpda start.If you run Tomcat using service wrapper, check the documentation for the service to determine how to set the required JVM options.
• If you start Tomcat from within an IDE, check the documentation for the IDE to determine how to set the required JVM options.
  

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