CODEWITHSUNDEEP
javaremote-debugging
yunfan
yunfan

Reputation: 800

Enable java remote debug in code

For example, we can enable java remote debug by adding following to command line.

-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=5005

But my application is running in yarn, I'm not sure which port is available.

So I want enable java debug in my code.

First I detect a available port and log in my program, then I can use this port to debug my application.

Upvotes: 2

Views: 8041

Answers (2)

brain99
brain99

Reputation: 893

I'm not sure this can be done from code; however according to an answer to this old question, it is possible to enable debugging for an already-running JVM using jsadebugd

As mentioned in said answer, the feature is marked experimental and unsupported so your mileage may vary.

Upvotes: 1

Florian Fray
Florian Fray

Reputation: 274

The address property specifies host (optionally) and port (only the port if host is left out). So address=5005 specifies the port 5005 in your case. If you want your program to wait until you connect your debugger, switch suspend=n to suspend=y.

Edit: Maybe I misunderstood your question. In case you want to enable debugging programmatically, this won't be possible as the debugging facility JPDA is not exposing a Java API nor any other way to start and stop it programmatically.

Upvotes: 1

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