xxx.jar中没有主清单属性

SpringBoot项目

pom.xml添加spring-boot-maven-plugin打包插件

<build>
        <plugins>
            <!--    添加这个插件        -->
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>2.3.6.RELEASE</version>
                <executions>
                    <execution>
                        <!--    这个不能少,亲测      -->
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <source>8</source>
                    <target>8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

如果不是springboot项目

添加maven-shade-plugin插件,需要指定程序入口,其中mainClass是包含main入口函数的class名

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-shade-plugin</artifactId>
                <version>3.2.4</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                        <configuration>
                            <filters>
                                <filter>
                                    <artifact>*:*</artifact>
                                    <excludes>
                                        <exclude>META-INF/*.SF</exclude>
                                        <exclude>META-INF/*.DSA</exclude>
                                        <exclude>META-INF/*.RSA</exclude>
                                        <exclude>META-INF/DEPENDENCIES</exclude>
                                        <exclude>META-INF/LICENSE*</exclude>
                                        <exclude>META-INF/NOTICE*</exclude>
                                        <exclude>META-INF/MANIFEST*</exclude>
                                    </excludes>
                                </filter>
                            </filters>

                            <transformers>
                                <transformer
                                        implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                    <mainClass>com.yalong.HelloWorld</mainClass>
                                </transformer>
                            </transformers>

                            <createDependencyReducedPom>false</createDependencyReducedPom>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>

        </plugins>
    </build>