I am trying to build a discord bot with the Java Discord API, but when I run this code snippet:
public static void main(String[] args) throws LoginException {
JDABuilder builder = JDABuilder.createDefault(token);
builder.setActivity(Activity.watching("boop"));
builder.build();
}
It throws this exception:
Exception in thread "main" java.lang.NoClassDefFoundError: gnu/trove/map/TLongObjectMap
at net.dv8tion.jda@4.2.0_216/net.dv8tion.jda.api.entities.Activity.watching(Activity.java:204)
at rambot/rambot.discord.MainApp.main(MainApp.java:14)Caused by: java.lang.ClassNotFoundException: gnu.trove.map.TLongObjectMap
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:606)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:168)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
... 2 more
Why is this being thrown, and how can I fix it?
For people who see this, but can't seem to read the comments or figure it out on their own. On the JDA wiki, there is an explanation as well. Credits to @BENRABAH Brahim Zaky
NoClassDefFoundError or ClassNotFoundException on startup
An error like java.lang.NoClassDefFoundError: net/dv8tion/jda/api/JDABuilder or similar means you are not including your dependencies or transitive dependencies in the archive.
Gradle (build.gradle)
With gradle this can be fixed by using the shadow plugin and building your jar with shadowJar instead. The jar will then be present in the build/libs directory with a name like example-1.0-all.jar
Maven (pom.xml)
With maven you need the shade plugin in your pom to add dependencies to your package task. You can see the shade plugin being applied in this example pom.xml
Jar (No build tools)
You need to use the-withDependencies.jarrather than the normal one.
The preferred method depends per programmer, but I suggest using either gradle or maven. Since they do everything from compiling your Jar to adding the dependencies.
I had the same issue too, this error is caused since your compiler didn't found the class path
my solution:
you have to delete the (JDA) from Modulepath and add it to Classpathh inside the (java build path).