Specify a list of fileset patterns to be included or excluded by adding <includes>/<include> or <excludes>/<exclude> in your pom.xml.
<project> ... <build> <plugins> ... <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-jar-plugin</artifactId> <version>3.1.0</version> <configuration> <includes> <include>**/service/*</include> </includes> </configuration> </plugin> ... </plugins> </build> ... </project>
Note that the patterns need to be relative to the path specified for the plugin's classesDirectory parameter.