[SOLVED] cmake for Java, how to specify main class and make jar file executable?

Issue

Hello.java:

public class Hello {
    public static void main(String[] args) {
        System.out.println("hello java");
    }
}

CMakeLists.txt:

cmake_minimum_required(VERSION 3.10)
project(Hello)

find_package(Java REQUIRED)
include(UseJava)

set(CMAKE_JAVA_COMPILE_FLAGS "-source" "11" "-target" "11")
set(CMAKE_JAVA_EXECUTABLE Hello)

add_jar(${PROJECT_NAME} Hello.java)

The generated Hello.jar's MANIFESET.MF, don't have the Main-Class option.
Even though I've already add:

set(CMAKE_JAVA_EXECUTABLE Hello)

Any idea how I can make the jar file executable?
I prefer not to write a MANIFEST.MF myself, or edit the one in generated .jar.

Solution

You need to add ENTRY_POIN that points to the main class into the add_jar as:

add_jar(${PROJECT_NAME} Hello.java ENTRY_POINT Hello)

Answered By - kofemann