Add Main-Class to manifest

gistfile1.xml

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-jar-plugin</artifactId>
  <configuration>
	<archive>
	  <manifest>
	    <mainClass>com.someclass.Main</mainClass>
	    <packageName>com.someclass</packageName>
	  </manifest>
	  <manifestEntries>
	    <mode>development</mode>
	    <url>${pom.url}</url>
	  </manifestEntries>
	</archive>
  </configuration>
</plugin>