How to run Jetty via Gradle in Debug Mode

Question

Does anyone know how to configure the jetty gradle plugin to run in debug mode so that I can attach a remote debugger?

I\'ve tried setting the gradle and java opts t

Answer 1

Im my cases, it doesn't work until I run the following command. GRADLE_OPTS='-XX:MaxPermSize=256M -Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=4001' gradle jettyRun

And when it works, in the server console I can use System.out.println(...) to inspect what I want to see. As for breakpoint debug, unfortunately, I haven't find a way to it. Anyone knows how, welcome to add complement.

Answer 2

Try using Gretty plugin, it provided gradle tasks jettyRunDebug, jettyStartDebug etc.

Source code and doc: https://github.com/akhikhl/gretty

Disclosure: I am author of Gretty plugin.

Answer 3

set GRADLE_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,address=9999,server=y,suspend=n does NOT work for me too when run with gradle jettyRunWar.

I found another solution which works, run gradle jettyRunWar with below options gradle -Dorg.gradle.jvmargs="-Xdebug -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n" jettyRunWar.

But when I add the same parameter in gradle.properties, it doesn't work...

Answer 4

Mine's a multi-project gradle build and I tried:

$ export GRADLE_OPTS="-Xdebug -Xrunjdwp:transport=dt_socket,address=9999,suspend=y,server=y"
$ gradle jettyRun

And that did NOT work. I even tried adding -Xnoagent to the GRADLE_OPTS setting above but that too did not make a difference. Also, setting JAVA_OPTS instead of GRADLE_OPTS did not solve the problem either. What solved the problem for me was adding a gradle.properties with:

org.gradle.jvmargs=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,address=5005,suspend=y

And immediately I could hit the breakpoint. May be solutions mentioned in other answers did not work for me because it is a multi-project build. Not sure!

Just wanted to provide the solution that worked for me in case above solutions do not work for other folks.

P.S: Tried with gradle 1.5/1.6 and adding the setting above to gradle.properties works for both versions!

Answer 5

add this into the build.gradle

jettyRun {
    jvmArgs '-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=5005'
}

Answer 6

Also, please look at this two links from official wiki:

https://github.com/akhikhl/gretty/issues/36

http://akhikhl.github.io/gretty-doc/Debugger-support.html

It can help you to properly configurate gretty plugin to debug jetty application with IntelliJ Idea