执行java -jar filename.jar提示没有主清单属性

<build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <id>repackage</id>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
                <!--<configuration>
                    <mainClass>${start-class}</mainClass>
                </configuration>-->
            </plugin>
        </plugins>
    </build>