Run Kotlin jar file

Question

I've been trying for some hours to run a generated kotlin jar file but I've been going through an error.

When running java -jar log-reader.jar I get the following exception:

Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: kotlin/coroutines/Continuation
        at java.lang.Class.getDeclaredMethods0(Native Method)
        at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
        at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
        at java.lang.Class.getMethod0(Class.java:3018)
        at java.lang.Class.getMethod(Class.java:1784)
        at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:650)
        at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:632)
Caused by: java.lang.ClassNotFoundException: kotlin.coroutines.Continuation
        at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 7 more

The jar is being generated using mvn package

I have already tried to change kotlin version and my IDEA plugin is already in the 1.3 version. Can anyone help me on this?

Thanks!

It seems the jar you are producing doesn't include the routines library, add the commands you are using to generate the jar so people can backtrack the problem — cutiko, Oct 06 '19 at 23:42
Thanks for the answer @cutiko! I'm generating the jar through mvn package — Victor Augusto, Oct 06 '19 at 23:56

score 2 · Answer 1 · answered Oct 07 '19 at 00:32

mvn package maven goal only packages your code into a jar, so that it doesn't contain the code of your dependencies required to run the jar.

You should either copy all your dependencies beside the entry-point jar or pack their content into your jar, creating a so called fat jar or an uber jar.

The latter can be achieved with the help of various maven plugins, e.g., maven-assembly-plugin, maven-shade-plugin, etc. You can read more about several ways to achieve it here: https://www.baeldung.com/executable-jar-with-maven.

See also this stackoverflow question about creating a fat jar: Building a fat jar using maven

Run Kotlin jar file

1 Answers1