Jar build for Gradle Hello World project can not be run

[agap]

I've imported the Gradle's hello-world project in Intellij Idea 15. Whenever I run the jar command from the 'Gradle Projects' command, the resulting jar does not have the 'Main-Class' entry in the manifest, so when I try to run "java -jar hello-world.jar", I see the following error: no main manifest attribute, in build/libs/hello-world.jar.

[politedog]

Adding the following to the end of the build.gradle will allow you to run it with that command line:
jar { manifest { attributes 'Main-Class': 'demo.HelloWorldKt' } from { configurations.compile.collect { it.isDirectory() ? it : zipTree(it) } } }

[artemyarulin]

The issue still exists after 3 years, not a very nice first experience from official hello world example. Workaround works though, wonder why wasn't that merged already?

[thosakwe]

Even the workaround doesn't work for me, haha.

[artemyarulin]

It should work though. I've just made a git clone of this repo, then went to gradle/hello-world directory and added those lines to build.gradle:

jar {
    manifest { attributes "Main-Class": mainClassName }
    from { configurations.compile.collect { it.isDirectory() ? it : zipTree(it) } }
}

Then compile and run it:

$ gradle jar
$ java -jar build/libs/hello-world.jar
Hello, world!

[thosakwe]

Not 100% sure why it didn't work for me; I probably just don't understand Gradle/Groovy yet.

I ended up just using apply: 'application', and then pointing to my ApplicationKt class and it all worked fine.

EDIT: I should have pointed out that I was using the Spring Boot example. Guess I was just commenting on the wrong issue.