You should move your to-be-packaged META-INF/MANIFEST.MF from /build/jollyday-0.5.10/ to /build/jollyday-0.5.10/target/classes/ . The manifest in maven-jar-plugin-3.1.2.jar has nothing to do with it.
Raphael Mechtilde Stehmann wrote: Hello I have a dependency to libmaven-jar-plugin-java. In the build process I get the message Failed to execute goal org.apache.maven.plugins:maven-jar-plugin:3.1.2:jar (default-jar) on project jollyday: Error assembling JAR: Manifest file: /build/jollyday-0.5.10/target/classes/META-INF/MANIFEST.MF does not exist. -> [Help 1] The file "META-INF/MANIFEST.MF" from "jollyday is in "/build/jollyday-0.5.10/ The file "META-INF/MANIFEST.MF" from libmaven-jar-plugin-java is in thze *.jar file in /usr/share/maven-repo/org/apache/maven/plugins/maven-jar-plugin/3.1.2/maven-jar-plugin-3.1.2.jar Shouldn't there be a symlink to /usr/share/java similar to many other packages? Where and how can I define to get it building now? Thanks in advance