UnsupportedOperationException in the output tabs for language servers.

[turkeylurkey]

lsp4jakarta and lcls output tabs included this exception
Dec. 12, 2022 3:58:14 P.M. org.eclipse.lsp4j.jsonrpc.RemoteEndpoint handleNotification
WARNING: Notification threw an exception: {
"jsonrpc": "2.0",
"method": "$/setTrace",
"params": {
"value": "off"
}
}
java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at org.eclipse.lsp4j.jsonrpc.services.GenericEndpoint.lambda$null$0(GenericEndpoint.java:67)
at org.eclipse.lsp4j.jsonrpc.services.GenericEndpoint.notify(GenericEndpoint.java:152)
at org.eclipse.lsp4j.jsonrpc.RemoteEndpoint.handleNotification(RemoteEndpoint.java:220)
at org.eclipse.lsp4j.jsonrpc.RemoteEndpoint.consume(RemoteEndpoint.java:187)
at io.openliberty.tools.langserver.common.ParentProcessWatcher.lambda$apply$0(ParentProcessWatcher.java:154)
at org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer.handleMessage(StreamMessageProducer.java:194)
at org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer.listen(StreamMessageProducer.java:94)
at org.eclipse.lsp4j.jsonrpc.json.ConcurrentMessageProcessor.run(ConcurrentMessageProcessor.java:113)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)
Caused by: java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.lsp4j.jsonrpc.services.GenericEndpoint.lambda$null$0(GenericEndpoint.java:65)
... 12 more
Caused by: java.lang.UnsupportedOperationException
at org.eclipse.lsp4j.services.LanguageServer.setTrace(LanguageServer.java:125)
... 17 more

[TrevCraw]

Hit this issue again while trying to recreate #247

[yeekangc]

Unsure how we can recreate this issue.

Need to determine how pervasive this issue is.

[rumanaHaque]

In my testing with VSCode using the latest driver dated May 29th, liberty-dev-vscode-ext-23.0.6-SNAPSHOT.vsix, I was not able to recreate this exception.

[TrevCraw]

@gilbysunil14 ran into this issue again and opened a duplicate here: #346

[gilbysunil14]

Found similar issue in eclipse-jdtls repo (eclipse-jdtls/eclipse.jdt.ls#2891) where an UnsupportedOperationException is thrown at org.eclipse.lsp4j.services.LanguageServer.setTrace. A proposed solution can be found at eclipse-jdtls/eclipse.jdt.ls#2893 to make the '$/setTrace' as empty to avoid throwing UnsupportedOperationException.

A similar change for setTrace() as was done in eclipse-lsp4j repo for getNotebookDocumentService() here: eclipse-lsp4j/lsp4j@04b0c61#diff-c253172d13cae9e4a8c919ba451df40be7096aad30d01638383c6ed0497e7f19R92

Raised this issue in lsp4j repo here: eclipse-lsp4j/lsp4j#853

[gilbysunil14]

Closing this issue since the solution has been provided in the lsp4jakarta PR eclipse/lsp4jakarta#531 as well as liberty language server OpenLiberty/liberty-language-server#321