MaVeN build takes, most of the times, wrong file

Question

I use the org.apache.maven.plugins maven-assembly-plugin version 2.2-beta-5 to build a jar-with-dependencies. One of the jars I include contains a persistence.xml file. The project that I build also has a persistence.xml file. The build finishes well.

The problem however is that most of the times the wrong persistence.xml file ends up in the jar-with-dependencies. If I, without changing anything, rebuild (and sometimes a few more times) then the correct persistence.xml is present.

I searched for a solution but I could not find a working example. How can I define in my pom.xml that I want my project's persistence.xml file in the jar-with-dependencies and not the one from the included jar?

My MaVeN version is Apache Maven 3.6.3 and all builds are done with mvn clean package.

Answer 1

Use maven-shade-plugin instead of mavenassembly-plugin to exclude the persistence.xml file from your dependencies

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-shade-plugin</artifactId>
    <version>2.3</version>
    <executions>
        <execution>
            <phase>package</phase>
            <goals>
                <goal>shade</goal>
            </goals>
            <configuration>
                <filters>
                    <filter>
                        <artifact>my:other:jar</artifact>
                        <excludes>
                            <exclude>persistence.xml</exclude>
                        </excludes>
                    </filter>
                </filters>
            </configuration>
        </execution>
    </executions>
</plugin>        

More info on this approach in the Apache Maven Shade Plugin documentation