如何找到jar文件的清单类？

Question

I have an application bundled in a jar file which I need to launch on Linux environment, but I am unable to figure out which class within this JAR file is the application's entry point.

I tried to run it on Windows CMD as below:

java -jar build21-jdk13.jar

It raised the following error:

no main manifest attribute, in build21-jdk13.jar

Any help would be highly appreciated.

Answer 1

For a jar to be able to run with java -jar command, the YourJar.jar/META-INF/MANIFEST.MF file should be like:

Manifest-Version: 1.0
Class-Path: .
Main-Class: the.package.ClassWithMainMethod

In your case, the Main-Class property is missing.
An alternative is to run the jar passing the main class as argument:

java -jar build21-jdk13.jar the.package.ClassWithMainMethod