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Remote debugging feature is provided by Java specification itself. Java provides this feature using listener binding mechanism. Basic concept is pretty simple and straightforward:
- Application to be debugged would attach a socket to itself and then would listen debug instructions on that socket.
- Debugger would bind itself to that socket and then send instructions on that socket.
JVM arguments for DEBUGGING:
- For JVMs prior to 1.5:
One need to supply two arguments, -Xdebug and -Xrunjdwp. -Xdebug tells JVM to run the application in debug mode, while -Xrunjdwp is used to supply debug parameters (It can also be used in JVM 1.5 or 1.6 as well)
e.g. -Xdebug -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n
- For JVMs 1.5 and 1.6:
Debug library is passed as -agentlib argument, along with debug paramters. Native library name for debugging is jdwp, so one need to supply -agentlib:jdwp along with debug paramters.
e.g. -agenlib:jdwp=transport=dt_socket,address=8000,server=y,suspend=n
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