What are the options of remote debugging like:-Xrunjdwp, server, suspend? : Adam Bien's Weblog
To debug an application remotely, you will have to set options like: -Xdebug -Xnoagent -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=4242. This allows remote debuggers (jdb even ships with JDK) to attach to a running Java process.
There are two flavors of transports: dt_socket and dt_shmem. The dt_shmem option only works in case both processes are running on the same platform and is only available on Windows.
With suspend=y the Java-process will wait until the debugger connects, with suspend=n you will be also able to debug the application servers startup process.
The option server=y opens a socket and listens for incoming debugger requests. With server=n the debugged application will try to connect actively to a debugger and run therefore as a client.
So there is no black magic involved in debugging application servers. As long they are implemented in Java, you will be always able to debug them. Even without any fancy tools.
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