Debugging a Java application… Remotely!

Have you ever had the need to debug a Java application remotely? You can! This post describes how you can do using Java and Eclipse.

Let’s start by describing some important ¬†Java¬†remote debugging parameters that we’ll make use of later.

  • transport=dt_socket instructs the JVM that the debugger connections will be made through a socket
  • address=8998 opens port number 8998 for use by the debug session
  • suspend=y starts the JVM in suspended mode and remains suspended until a debugger is attached to it

Now that we have that under our belt, let’s get to the good stuff…

1. Start an application for remote debugging:

The command line below will cause the application to listen for a debug connection on port 8998. The application will start ‘suspended’ and will ‘resume’ once a debugger has attached.

java -Xdebug -Xrunjdwp:server=y,transport=dt_socket,suspend=y,address=8898 MyApplication

2. Start an eclipse application for remote debugging:

eclipse.exe -vmargs -Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8998

3. Use Eclipse to connect to an application that was started for remote debugging.
eclipse_rdebug

Using the Eclipse Debug configuration wizard, we can create a ‘Remote Java Application’ debug configuration. This can be configured to attach to a remote java application started using JPDA.

Thank you!

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