附加调试器（使用eclipse）来播放框架失败

Question

I am using Scala to write a web on top of Play framework with eclipse IDE. I am trying to debug my app but hit debug attach failure. I tried to switch using Java instead of Scala,but I got same error. This is what I do.

1. Create a project and run play clean compile
2. run play debug run
3. in Eclipse, set 'debug configration' ->remote java application -> host: localhost, port:9999 and common: debug
4. in browser type in URL and enter: localhost:9999. Then get the following failure in play framework command line: Debugger failed to attach: handshake failed - received >GET / HTTP/1.1< - expected >JDWP-Handshake<

Any idea what is wrong?

Answer 1

localhost:9999 is what Eclipse is going to use to communicate with your application. On your browser, you still access your application on localhost:9000 (default) or however you would access your application had you just done play run .

Basically, you've configured your debugging correctly in Eclipse.

1. Now, with your configuration selected from the Debug Configuration , click Debug (or selected your configuration from the Debug As toolbar button). Eclipse will attach to localhost:9999 .
2. Browse to localhost:9000 like you normally would to access your application.
3. That's it. Eclipse will pause on any breakpoints you have set, etc.