can't determined while same package in different library

[arjenzhou]

I am trying transform zookeeper library to module. In which same package org.apache.zookeeper.server.persistence found in zookeeper-jute-{version}.jar and zookeeper-{version}.jar.

plugins {
    id 'de.jjohannes.extra-java-module-info'
}

dependencies {
    implementation('org.apache.zookeeper:zookeeper:3.7.0') {
        exclude group: 'log4j'
        exclude group: 'org.slf4j'
    }
}

extraJavaModuleInfo {
    module("zookeeper-3.7.0.jar", "org.apache.zookeeper.zookeeper", "3.7.0") {
        requires("org.apache.jute")
        requires("org.apache.yetus.audience")
        exports("org.apache.zookeeper")
    }
    module("zookeeper-jute-3.7.0.jar", "org.apache.jute", "3.7.0") {
        requires("org.apache.yetus.audience")
        exports("org.apache.jute")
    }
    module("audience-annotations-0.12.0.jar", "org.apache.yetus.audience", "0.12.0") {
        exports("org.apache.yetus.audience")
    }
}

It wil throws

Error occurred during initialization of boot layer
java.lang.LayerInstantiationException: Package org.apache.zookeeper.server.persistence in both module org.apache.jute and module org.apache.zookeeper.zookeeper

while trying to run

ZooKeeper zooKeeper = new ZooKeeper("localhost:2181", 1000, null);

[jjohannes]

Unfortunately, ☹️ this is an issue with the Java Module System, which I also regularly forget about: It is not allowed to have the same package in two Jars even if the package is not exported.

At some point, I was thinking that exactly what you are doing could be a solution to mitigate the split package situation of some non-module libraries. Unfortunately, it is not the case.

I don't see a solution how you could use both Jars together in a "full" module setup. This is frustrating...

There is an attempt I haven't followed up with to allow this plugin to merge two Jars into one as a band aid for such situations: #1 (comment)

I might consider giving that another try. Would that "workaround" help you? (Of course contributions are always welcome!)

[jjohannes]

The plugin (with version 0.12) now supports merging of Jars which have the 'split package' issue. See:
https://github.com/jjohannes/extra-java-module-info#what-do-i-do-in-a-split-package-situation

Maybe this is helpful for you @arjenzhou.

[arjenzhou]

@jjohannes Thanks, I will try it later.