hot reload: mvn google cloud sdk

[Rajesh G]

Hello,

I have created a simple java appengine using maven archetypes.

I am not using eclipse (because I don't have eclipse in windows wsl2.)

I run the server using

mvn appengine:run

Then I do simple changes to a servlet. Then another window, I run 

mvn:compile.  It compiles into the target/snapshot folder

However, I am not seeing the changes on the server.  The latest servlet changes is not reflected 

I tried the following settings also in the pom.xml file.  The server is not restarted

<configuration>
  <automaticRestart>true</automaticRestart>
</configuration>

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[Ludovic Champenois]

Hi,

Almost there,  I think you are missing this critical line in your pom.xml:

    <build>
        <outputDirectory>target/${project.artifactId}-${project.version}/WEB-INF/classes</outputDirectory>
        <plugins>

...

This way, the compile on save is put the changed class in the correct web app location.

At least, I tested it in NetBeans and it works great as NetBeans can do compile automatically when you save a java file, even in the Maven project.

Ludo

[Rajesh G]

Hi, any ideas on how to make the hot reload work 

Thanks

[Ludovic Champenois]

Hi,

Try to follow the doc at:

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

Especially the config for the Pom.xml file to put the classes in the correct folder.

Thanks

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[Rogelio Monter Rodriguez]

As stated in the app-maven-plugin User guide:

    To enable automatic reload of an application, you must tell the Dev App Server to scan for changes :

    <configuration>

      <automaticRestart>true</automaticRestart>

    </configuration>

    While your app is running, just run mvn war:exploded to reflect your changes into the running application.

[Rajesh G]

mvn war:exploded did not work.

However, mvn compile is working now and the server will restart. It did not when I tried earlier.

Cheers

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[Rajesh G]

If you dont' use IDE  like eclipse or netbeans (it is not available on windows 11 wsl2 env)

Use mvn compile.

It is working for me now on windows 11.  I will try on wsl2 later.

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[Ludovic Champenois]

Hi,

You can install InteliJ on wsl2 according to https://nirisarri.github.io/2020-11-03-how-to-install-and-run-intellij-idea-for-linux-in-wsl2/

similar steps should work for NetBeans or Eclipse I guess.

Ludp

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[Rogelio Monter Rodriguez]

This gist on GitHub provides a summary on how to run Eclipse on WSL2.

For Netbeans, as shown on this StackOverflow answer, there’s only a workaround.

Also, this tutorial could be useful for Using WSL 2 to develop Java applications on Windows.