Quark.jar -

dependencies implementation files('libs/quark.jar')

java -cp quark.jar com.example.MainClass Find the main class by examining the JAR: quark.jar

jar tf quark.jar | grep -E 'Main.*\.class|Application\.class' Means dependencies are missing. Inspect the JAR’s dependencies: dependencies implementation files('libs/quark

Problem 1: No main manifest attribute Fix: Specify main class explicitly: quark.jar

<dependency> <groupId>com.yourcompany</groupId> <artifactId>quark</artifactId> <version>1.0</version> <scope>system</scope> <systemPath>$project.basedir/libs/quark.jar</systemPath> </dependency>