How can I remove module-info.class warning for a shaded .jar?

Question

I'm packaging a Spring Boot app into an uber jar using the maven-shade plugin. Simple, right? Well, it is except as of recently I'm getting the following warning at the end of mvn clean package:

[WARNING] Discovered module-info.class. Shading will break its strong encapsulation.

It's not actually breaking anything but I'm a perfectionist and this is driving me nuts. How do I get rid of it? I've tried many things without success.

Answer 1

Filtering out the file in the shade plugin seems to work fine for me.

Here's what my maven-shade-plugin config looks like:

<plugin>     <groupId>org.apache.maven.plugins</groupId>     <artifactId>maven-shade-plugin</artifactId>     <version>3.2.1</version>     <configuration>         <filters>             <filter>                 <artifact>*:*</artifact>                 <excludes>                     <exclude>module-info.class</exclude>                     <exclude>META-INF/*.SF</exclude>                     <exclude>META-INF/*.DSA</exclude>                     <exclude>META-INF/*.RSA</exclude>                 </excludes>             </filter>         </filters>     </configuration>     <executions>         <execution>             <phase>package</phase>             <goals>                 <goal>shade</goal>             </goals>         </execution>     </executions> </plugin> 

The key line is the <exclude>module-info.class</exclude>. The filter excludes that file whenever it sees it, in any artifact (*:* = any artifact). (The other three excludes I use to get rid of bugs with signature files in dependencies)

I haven't noticed any unwanted side effects from doing this, and the warning is now gone!