jar中没有主清单属性【解决办法】

解决
修改pom文件，引入spring-boot-maven-plugin 【亲测有效】

        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>2.3.1.RELEASE</version>
                <configuration>
                    <mainClass>
                        com.providerticket.ProviderTicketApplication
                    </mainClass>
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>