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Maven build with POM-type dependencies
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Maven build with POM-type dependencies


  • Subject: Maven build with POM-type dependencies
  • From: Dennis Scheffer <email@hidden>
  • Date: Mon, 07 Jan 2019 09:02:58 +0100

Hello everyone,

As per the Maven best practices found at
https://books.sonatype.com/mvnref-book/reference/pom-relationships-sect-pom-best-practice.html

<https://books.sonatype.com/mvnref-book/reference/pom-relationships-sect-pom-best-practice.html>,
 I am trying to group common dependencies in separate modules of a multi-module
project. When running the project in Eclipse everything works fine but when I
deploy the application the startup fails due to bad jar-files.

I narrowed down the classpath entries causing the application to fail and
discovered the cause. For some reason the *ClassPath.txt files generated by the
wolifecycle plugin contain entries even for the pom type dependencies.

So if I have a dependency like this in my pom file

<dependency>
  <groupId>com.example</groupId>
  <artifactId>Dependencies</artifact>
  <version>1.0</version>
  <type>pom</pom>
</dependency>

I get an entry in my *ClassPath.txt files like this

APPROOT/Resources/Java/com/example/Dependencies/1.0/Dependencies-1.0.jar

Since the respective modules do not produce jar files due to their packaging
type being 'pom', the built generates some dummy .jar files which seem to be
broken. When I try to unzip such files from the command line, I get the error:

End-of-central-directory signature not found.  Either this file is not
  a zipfile, or it constitutes one disk of a multi-part archive.  In the
  latter case the central directory and zipfile comment will be found on
  the last disk(s) of this archive.


When I remove the faulty entries from the *ClassPath.txt files, the application
starts successfully. Has anyone encountered this problem? Is there a good way
to have the build process remove such entries automatically or maybe not
generate them at all?

Thanks a lot for any suggestions!


With kind regards

--
Dennis Scheffer

Phone    +49-(0)941-69 84 84-25
email@hidden

===================================

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