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Maven-dependency-plugin generates duplicate files in jar-with-dependencies.jar file

I am creating a standalone java application with maven and I include the dependencies in the jar file with maven-dependecy-plugin as follows:

<plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-dependency-plugin</artifactId>
            <executions>
                <execution>
                    <id>copy-dependencies</id>
                    <phase>prepare-package</phase>
                    <goals>
                        <goal>copy-dependencies</goal>
                    </goals>
                    <configuration>
                        <outputDirectory>${project.build.directory}/classes/lib</outputDirectory>
                        <overWriteReleases>false</overWriteReleases>
                        <overWriteSnapshots>false</overWriteSnapshots>
                        <overWriteIfNewer>true</overWriteIfNewer>
                    </configuration>
                </execution>
            </executions>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-jar-plugin</artifactId>
            <configuration>
                <archive>
                    <manifest>
                        <addClasspath>true</addClasspath>
                        <classpathPrefix>lib/</classpathPrefix>
                        <mainClass>theMainClass</mainClass>
                    </manifest>
                </archive>
            </configuration>
        </plugin>

         <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-assembly-plugin</artifactId>
                <executions>
                    <execution>
                        <id>create-my-bundle</id>
                            <phase>package</phase>
                                <goals>
                                    <goal>single</goal>
                                </goals>
                     <configuration>
                       <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                       </descriptorRefs>

                     </configuration>
                    </execution>
               </executions>
        </plugin>

this includes the dependencies in the generated jar file in the lib folder, and the jar works and works fine, but the problem is another created jar file appname-1.0-jar-with-dependencies.jar.

QUESTION: I am not sure if this is a problem or not, but I noticed in the target folder in the generated folder appname-1.0-jar-with-dependencies.jarthat it contains duplicate application files, for example:

  • all sql files, property files, xml files exist twice.
  • all java classes .class file exists twice.
  • There are many overview.html and license.txt files related to dependencies.

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