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No Xtext languages have been registered [message #1844253]

Tue, 07 September 2021 08:25

Hung Nguyen

Messages: 2
Registered: September 2021

Junior Member

Hi, I'm trying to add XText LSP to an existing XText language. What I did is I create a fresh project with the same language name and copy the ide module from the fresh XText project to the existing one.

The existing project has another class, where all the CLI operation's entry points are (let call it CLI.java). So I create a class called RunLSP inside the ide module, which contains a simple entry to ServerLauncher like this:

public class RunLSP {
	public static void run() {
		ServerLauncher.main(null);
	}
}

And then, in the CLI.java, I import RunLSP to headless and use RunLSP.run(). When the language server starts. It prints out a stack trace and complains that there is no language registered and I should put the setup class inside 'src-gen/META-INF/services/org.eclipse.xtext.ISetup'. The problem is the file is already there so I really don't know what to do.

SEVERE: Internal error: java.lang.reflect.InvocationTargetException
java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
        at org.eclipse.lsp4j.jsonrpc.services.GenericEndpoint.lambda$null$0(GenericEndpoint.java:67)
        at org.eclipse.lsp4j.jsonrpc.services.GenericEndpoint.request(GenericEndpoint.java:120)
        at org.eclipse.lsp4j.jsonrpc.RemoteEndpoint.handleRequest(RemoteEndpoint.java:261)
        at org.eclipse.lsp4j.jsonrpc.RemoteEndpoint.consume(RemoteEndpoint.java:190)
        at org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer.handleMessage(StreamMessageProducer.java:194)
        at org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer.listen(StreamMessageProducer.java:94)
        at org.eclipse.lsp4j.jsonrpc.json.ConcurrentMessageProcessor.run(ConcurrentMessageProcessor.java:113)
        at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base/java.lang.Thread.run(Thread.java:832)
Caused by: java.lang.reflect.InvocationTargetException
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:564)
        at org.eclipse.lsp4j.jsonrpc.services.GenericEndpoint.lambda$null$0(GenericEndpoint.java:65)
        ... 11 more
Caused by: java.lang.IllegalStateException: No Xtext languages have been registered. Please make sure you have added the languages's setup class in '/META-INF/services/org.eclipse.xtext.ISetup'
        at org.eclipse.xtext.ide.server.LanguageServerImpl.initialize(LanguageServerImpl.java:210)
        ... 16 more

Does anyone know how to solve this? Thank you very much.

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Re: No Xtext languages have been registered [message #1844272 is a reply to message #1844253]

Tue, 07 September 2021 16:16

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Does your project use the new workflow and project setup as the wizard creates them for new projects
? Is there a meta-und/services generated in Sri-gen of ide project ?

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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