Some Maven projects use 3rd party Maven plugins to generate sources or resources, and you may find that the generated code is not picked up by the project classpath, or the Maven goals are not executed by Java extension. This is a known technical issue with `m2e`, the underlying Maven integration tool for Java extension. The reason is that the Maven tooling `m2e` doesn't know if it's safe to run your Maven plugin automatically during a workspace build, so it does not run them by default and requires explicit instructions on how to handle them. Learn more about this issue from the wiki about [Execution Not Covered](https://www.eclipse.org/m2e/documentation/m2e-execution-not-covered.html).
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