在运行 java -jar XXX.jar 报错没有主清单属性问题解决，如下图

解决办法

在打包plugin里添加

<executions>
	<execution>
		<goals>
			<goal>repackage</goal>
		</goals>
	</execution>
</executions>

完整代码如下：

    <build>
        <plugins>
            <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>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <includeSystemScope>true</includeSystemScope>
                    <mainClass>com.example.demo.MyBaasRestDemoApplication</mainClass>
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

注意自己修改 mainClass 内容