What to do if you are told "there is no main manifest attribute" when creating a jar file containing dependencies in a maven project

As the title says ...

Package with dependencies

Use the maven-assembly-plugin plugin to package all the dependencies.

Add it under project-> build-> plugins in pom.xml.

pom.xml


<build>
    <plugins>
      <plugin>
        <artifactId>maven-assembly-plugin</artifactId>
        <executions>
          <execution>
            <phase>package</phase>
            <goals>
              <goal>single</goal>
            </goals>
          </execution>
        </executions>
        <configuration>
            <archive>
              <manifest>
                <mainClass>com.example.App</mainClass>
              </manifest>
            </archive>
          <descriptorRefs>
            <descriptorRef>jar-with-dependencies</descriptorRef>
          </descriptorRefs>
        </configuration>
      </plugin>
    </plugins>
  </build>

Like this.

When I run the jar, it says "there is no main manifest attribute"

If you don't specify configuration-> ʻarchive- manifest-> mainClass` (at least in my trial), the title will say" No main manifest attribute "when running the jar. I did.

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