Re: is it possible to debug GWT projects (breakpoints, step through code etc) ?

This might be useful  github.com/timmacp/AppEngineGwt/tree/main

Its based on github.com/tbroyer/gwt-maven-archetypes 

& Google Cloud Platform samples for App Engine with Java 11+

github.com/GoogleCloudPlatform/java-docs-samples/tree/main/appengine-java11/appengine-simple-jetty-main which shows how to have a separate jar module which run the WAR using the  java command.

As in the GWT archetype it uses Jetty Maven Plugin for the development server & it covers Eclipse debugging,

appengine-maven-plugin is only for appengine:deploy

On Friday, June 28, 2024 at 2:50:21 PM UTC+1 Daniel Webb wrote:

Hi Thomas,

Aha!! You are correct, thank you - I have added it to my POM and now the breakpoints are getting triggered :-)

Is there a way of limiting this configuration to a specific run configuration, or sometning? The way I have it set up I think the flags are passed every time?

<plugin>

<groupId>com.google.cloud.tools</groupId>

<artifactId>appengine-maven-plugin</artifactId>

<version>2.7.0</version>

<configuration>

<jvmFlags>

<jvmFlag>-agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=8000</jvmFlag>

</jvmFlags>

</configuration>

</plugin>

On Friday 28 June 2024 at 13:34:03 UTC+1 Thomas Broyer wrote:

You need to pass the -agentlib:… as <jvmArgs> of the appengine plugin, as it will fork a new JVM

https://cloud.google.com/appengine/docs/legacy/standard/java/maven-reference#appenginerun

On Thursday, June 27, 2024 at 7:15:26 PM UTC+2 dw...@cobwebb.com wrote:

Hi,

Can anyone help me get remote jdwp server debugging in Eclipse working? I seem to be able to get a server running but it won't halt on breakpoints.

I run as.. "Maven Build" with goals of 'clean install appengine:run' and vm arguments of '-agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=8000'

The Console says "Listening for transport dt_socket at address: 8000"

Then I "Debug as..." "Remote Java Application"...

And the console starts up again with the 'clean install appengine:run' finishing up with the usual:

Started NetworkTrafficSelectChannelConnector {HTTP/1.1, (http/1.1)}{localhost:8080}

At which point I can browse to http://localhost:8080 but none of my breakpoints will trigger.

Please, what am I doing wrong? I've not done java remote debugging before :-(

Regards

Daniel

On Thursday 27 June 2024 at 16:21:17 UTC+1 Daniel Webb wrote:

Thanks Ralph, So it's source map debugging in chrome for the client side, jdwp remote debugging for the server side.

  

On Tuesday 25 June 2024 at 14:09:20 UTC+1 Ralph Fiergolla wrote:

Hi! Unless you want to invest time and effort in getting eclipse plugins up and running, I would suggest using your browser's development tools (Ctrl+Shift+I in Chrome/Edge) to debug the client side. Thanks to source maps it will show your JAVA source code when debugging. 

To debug the server side, you need to start your server with "-Xdebug -Xrunjdwp:server=y,transport=dt_socket,address=8000,suspend=n" and create a debug configuration to connect to port 8000 in Eclipse.

Good luck

Ralph

On Mon, Jun 24, 2024 at 11:19 AM 'Daniel Webb' via GWT Users <google-we...@googlegroups.com> wrote:

Hi, 

Is it possible to debug GWT projects - setting breakpoints and stepping through code? This would be server and/or client debugging.

We've just had our internal GWT based app updated and it now uses maven to run (clean install appengine:run). The eclipse plugin based debugging technique that I used to use no longer seems to work.

Thanks for any advice, I really like GWT but I'm lost as to how it all works!

Daniel

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