Run java jar - no main manifest attribute error

Question

I’ve created simple java program (maven with pom ) which when I run some command with CMD it should created a file under given path... I do mvn clean install which finish successfully, Now I want to use this created jar from the command line like follwoing:

java -jar   "/Users/i012/IdeaProjects/myproj/target/test.rts-1.0-SNAPSHOT.jar" path2genfile2create 

Which should run my program (this the first time that I try something like this…)

But the error which Im getting is:

no main manifest attribute, in /Users/i012/IdeaProjects/myproj/target/test.rts-1.0-SNAPSHOT.jar

What could be missing here ? which manifest attribute ?

The error is not coming from the class i’ve created …

i've created some META-INF/MANIFEST.MF not helping but maybe Its wrong

Answer 1

If you're using the Maven assembly plug-in, or your IDE tooling is, you need a mainClass element. This is what I use:

<plugin>
    <artifactId>maven-assembly-plugin</artifactId>
    <configuration>
      <archive>
        <manifest>
          <mainClass>com.foo.MyMainClass</mainClass>
        </manifest>
      </archive>
      <descriptorRefs>
        <descriptorRef>jar-with-dependencies</descriptorRef>
      </descriptorRefs>
    </configuration>
    <executions>
      <execution>
      <id>make-assembly</id>
      <phase>package</phase>
      <goals>
        <goal>single</goal>
      </goals>
      </execution>
    </executions>
  </plugin>