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Re: [m2e-dev] Extension changing runtime environment
Thanks, this solve the problem. Actually I was trying secondaryTo before but with wrong binding so it did not worked.

I've also found a different way. I can create configurator implementing IJavaProjectConfigurator and bind it to toolchains plugin. Such configurators are called by javaConfigurator to modify created classpath (configureRawClasspath()). So now I have two options how to solve it.

Thanks,
Martin

On Fri, Jan 16, 2015 at 4:21 PM, Fred Bricon <fbricon@xxxxxxxxx> wrote:
Have you tried declaring your configurator as secondaryTo the javaConfigurator?

   <extension point="org.eclipse.m2e.core.projectConfigurators">
      <configurator 
          id="foo.bar.toolchain"
          class="foo.bar.toolchainConfigurator"
          name="toolchainConfigurator" 
          secondaryTo="org.eclipse.m2e.jdt.javaConfigurator"
          />
    </extension> 

Keeping the same goal mappings as javaConfigurator in your lifecycle mapping file. 

So the JDT one will run first, then your extension can override the original settings

On Fri, Jan 16, 2015 at 4:34 AM, Martin Frydl <mfrydl@xxxxxxxxx> wrote:
Hello,

I'm trying to write extension to m2e which will change execution environment. Currently it is selected according to target JRE version set in maven-compiler-plugin (org.eclipse.m2e.jdt.internal.AbstractJavaProjectConfigurator.getExecutionEnvironmentId()). I want to do that according to maven-toolchains-plugin.

I've created my own configurator extending AbstractJavaProjectConfigurator, overridden getExecutionEnvironmentId() method and registered it to maven-toolchains-plugin. Now when I update project in Eclipse, my configurator is correctly invoked and selects the right environment. However, in next step the original JavaProjectConfigurator registered to maven-compiler-plugin is run and it resets execution environment back according to target.

How can I provide m2e plugin which will change behavior of the JavaProjectConfigurator? Since it has lot of protected methods, it looks like being extensible, but I'm not able to properly register my extension. When I register my configurator to maven-toolchains-plugin, it runs before JavaProjectConfigurator and any changes are lost. If I register my configurator also to maven-compiler-plugin in hope to override the default, it does not work at all since there are two configurators for single maven plugin which is not allowed. Looking at bug #435803, it should be somehow possible to provide extensions/subclasses to JavaProjectConfigurator, but I'm not able to find any information how that should be achieved. The examples I've found only generate extra sources files, but don't alter the project settings.

So far I see only two "ugly" solutions. First, modify AbstractJavaProjectConfigurator directly in org.eclipse.m2e.jdt plugin, which means I cannot use "official" m2e plugin any more. Second possibility is to add extra useless binding of maven-toolchains-plugin to my pom files since when I bind it to some phase after maven-compiler-plugin, my m2e plugin gets invoked after JavaProjectConfigurator and then it works since nobody will overwrite my changes. Normally the toolchains plugin is bound to some early phase like "initialize" because it needs to be run before compilation. Later phases are too late. But binding it also to "test" phase puts it twice in maven execution (before and after compiler) and that forces m2e to run configurators in different order.

How to create m2e plugin changing execution environment "the right way"?

Regards,
Martin Frydl

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