[jira] [Created] (MJMOD-27) Implement unpack goal

["Alexander Kriegisch (Jira)" <ji...@apache.org>]

Alexander Kriegisch created MJMOD-27:
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             Summary: Implement unpack goal
                 Key: MJMOD-27
                 URL: https://issues.apache.org/jira/browse/MJMOD-27
             Project: Maven JMod Plugin
          Issue Type: New Feature
    Affects Versions: 3.0.0-alpha-1
            Reporter: Alexander Kriegisch


There has not been another alpha release for 2.5 years (2017/09 to 2020/05), so I am not sure if this project is dead or alive. But in case development is still active, I would like to have an option not only to create a JMOD but also to unpack one. Maybe this could also be implemented in Maven Assembly. I am not sure where it would fit best, but I think here.

Background:
 * Sometimes I want to instrument JRE/JDK classes using ASM, ByteBuddy, Javassist or similar byte code engineering tools during build time in order to then either prepend the resulting JAR file to the boot classpath (Java <= 8) or to use `--patch-module` (Java >= 9).
 * In order to do that in Java 9+ environments, I have to use JDK command line tools like _jmod.exe_ (unpack single JMOD from _jmods_ directory) or _jimage.exe_ (unpack _lib/modules_).
 * The result is a partly scripted build, using a Beanshell script via Build Helper or something like Antrun.
 * The benefit of having an unpack feature accessible via a Maven plugin is obvious, I think. Who likes scripted builds?



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