Reason: the meta-inf/manifest.mf file in the jar package is missing the key value pair of “main class”

terms of settlement:

<build>
<pluginManagement> 
<plugins>
<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-jar-plugin</artifactId>
    <configuration>
        <archive>
            <manifest>
                <mainClass>com.u1w2.sla.App</mainClass>
            </manifest>
        </archive>
    </configuration>
</plugin>

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