When a Maven project generates a jar file, it prompts "no main list attribute", mavenjar

When a Maven project generates a jar file, it prompts "no main list attribute", mavenjar

A Maven project is created,mvn compileAndmvn packageGenerate a jar file and then directly gotargetDirectory to executejava -jar xxx.jarWhen running the jar package, the error message "xxx. jar has no main list attribute" is displayed.

Modifypom.xmlFile, add the following configuration items:

<build>  <plugins>    <plugin>        <groupId>org.apache.maven.plugins</groupId>        <artifactId>maven-shade-plugin</artifactId>        <version>1.2.1</version>        <executions>            <execution>                <phase>package</phase>                <goals>                        <goal>shade</goal>                </goals>                    <configuration>                        <transformers>                            <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">                                <mainClass>com.package.project.App</mainClass>                            </transformer>                        </transformers>                    </configuration>            </execution>        </executions>     </plugin>  </plugins></build>

Com. package. project is the package name of the entry class.