Add possibility to pass arguments before -cp command in native-maven-plugin

[maximkovalenko-hc]

We're trying to use -H:+UnlockExperimentalVMOptions option in native-maven-plugin to get rid form native compilation warnings:

14 26.97 Warning: The option '-H:ReflectionConfigurationResources=META-INF/native-image/org.apache.tomcat.embed/tomcat-embed-websocket/tomcat-reflection.json' is experimental and must be enabled via '-H:+UnlockExperimentalVMOptions' in the future.
14 26.97 Warning: The option '-H:ReflectionConfigurationResources=META-INF/native-image/org.apache.tomcat.embed/tomcat-embed-el/tomcat-reflection.json' is experimental and must be enabled via '-H:+UnlockExperimentalVMOptions' in the future.
14 26.97 Warning: The option '-H:ResourceConfigurationResources=META-INF/native-image/org.apache.tomcat.embed/tomcat-embed-core/tomcat-resource.json' is experimental and must be enabled via '-H:+UnlockExperimentalVMOptions' in the future.
14 26.97 Warning: The option '-H:ReflectionConfigurationResources=META-INF/native-image/org.apache.tomcat.embed/tomcat-embed-core/tomcat-reflection.json' is experimental and must be enabled via '-H:+UnlockExperimentalVMOptions' in the future.
14 26.97 Warning: The option '-H:IncludeResources=rabbitmq-amqp-client.properties|version.properties' is experimental and must be enabled via '-H:+UnlockExperimentalVMOptions' in the future.
14 26.97 Warning: The option '-H:ResourceConfigurationResources=META-INF/native-image/org.apache.tomcat.embed/tomcat-embed-el/tomcat-resource.json' is experimental and must be enabled via '-H:+UnlockExperimentalVMOptions' in the future.
14 26.97 Warning: The option '-H:ResourceConfigurationResources=META-INF/native-image/org.apache.tomcat.embed/tomcat-embed-websocket/tomcat-resource.json' is experimental and must be enabled via '-H:+UnlockExperimentalVMOptions' in the future.

It works only when -H:+UnlockExperimentalVMOptions option is before -cp command.

Please add a possibility to pass arguments before -cp command in native-maven-plugin.

[vjovanov]

@maximkovalenko-h thank you for reporting. We will discuss this at our next meeting to find a solution.

In the meanwhile, have you opened a ticket for org.apache.tomcat to fix this in their jars? ResourceConfigurationResources should not even be used already for a long while.

[maximkovalenko-hc]

Hello @vjovanov, thank you.
Yes, we reported it to Tomcat team.
https://bz.apache.org/bugzilla/show_bug.cgi?id=69465

[olpaw]

While I agree that in this instance the right solution is to fix the tomcat artifacts to not use deprecated options anymore, the request to allow to control the place where -cp ... gets emitted in the native image command is valid.

The right way to provide that for maven is to use the maven exec plugin for inspiration.
See https://www.mojohaus.org/exec-maven-plugin/examples/example-exec-for-java-programs.html

I.e. we could also introduce <classpath/> and <modulepath/> to be allowed in our <buildArgs>.
If found, we would expand it and suppress our implicit adding of -cp ... (-p ... respectively).