Maven: JAR will be empty - no content was marked for inclusion

Question

I have a minor problem with maven. When I run the command mvn package I get the following warning:

[WARNING] JAR will be empty - no content was marked for in

Answer 1

I hope you have good reason not to follow the standard directory layout, otherwise consider to rearrange the folders: it will make your life a lot easier (as well as for your co-workers). My guess is that nothing has been compiled. In that case: removing the configuration of the maven-compiler-plugin should be enough.

Answer 2

Please try this one:

<build>
  <finalName>${project.artifactId}-${project.version}</finalName>
  <sourceDirectory>src</sourceDirectory>
  <testSourceDirectory>test</testSourceDirectory>
  <resources>
    <resource>
      <directory>src</directory>
      <excludes>
        <exclude>**/*.java</exclude>
      </excludes>
    </resource>
  </resources>
  <testResources>
    <testResource>
      <directory>test</directory>
      <excludes>
        <exclude>**/*.java</exclude>
      </excludes>
    </testResource>
  </testResources>
  <plugins>
    <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-compiler-plugin</artifactId>
      <version>${maven-compiler-plugin.version}</version>
      <configuration>
        <source>${maven.compiler.source}</source>
        <target>${maven.compiler.target}</target>
      </configuration>
    </plugin>
  </plugins>

</build>

If you want to convert an existing Eclipse Java Project just right click on Java Project and click Configure/Convert to Maven Project.