使用 maven-assembly-plugin 创建的 Jar 未使用 mvn install 运行

Question

I am creating a jar file using maven assembly plugin. The minimal pom file looks like:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-assembly-plugin</artifactId>
    <version>3.3.0</version>
    <configuration>
        <archive>
            <manifest>
                <addClasspath>true</addClasspath>
                <mainClass>com.org.taptest.tests.TestsRunningAsTAP</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>
        <configuration>
          <outputDirectory>${basedir}/target/</outputDirectory>
        </configuration>
      </execution>
   </executions>
</plugin>

When I run mvn clean install , it creates a jar file but when I run the jar file using java -jar <jarfileName> , it says Error: Could not find or load main class . While if I edit the above pom, to have

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-assembly-plugin</artifactId>
  <version>3.3.0</version>
  <configuration>
    <archive>
      <manifest>
        <addClasspath>true</addClasspath>
                          
       <mainClass>com.org.taptest.tests.TestsRunningAsTAP</mainClass>
      </manifest>
    </archive>
    <descriptorRefs>
       <descriptorRef>jar-with-dependencies</descriptorRef>
    </descriptorRefs>
  </configuration>
</plugin>

and after running mvn clean install , I run mvn compile test-compile assembly-plugin , it generates the same jar file, but this jar file runs as expected. So, my question is why the jar file with the first approach does not runs and what exactly does mvn compile test-compile assembly-plugin command do?

Answer 1

I was facing Same issue,

please check if you have added jar at top you pom.xml inside tag.

like this:

<project>
    <groupId>com.rohan</groupId>
    <artifactId>jmetertester</artifactId>
    **<packaging>jar</packaging>**