Keep getting "Couldn't start client Language Support for Java" when opening a Java file in vscode.

[JLP04]

Whenever I open a .java file in a workspace, I get the errors "Couldn't start client Language Support for Java" and "Couldn't start client Language Support for Java (Syntax Server)". I was previously able to use the Java extension in this same workspace.

Environment

• Operating System: macOS Big Sur 11.2.1
• JDK version: 15.0.2
• Visual Studio Code version: 1.53.2
• Java extension version: 0.75.0

Steps To Reproduce

1. Open a folder with .java files in vscode (one which was created with the "Java: Create Java Project" command.
2. Open a .java file

[Please attach a sample project reproducing the error]
Monday Class.zip
Please attach logs
Logs.zip

Note: In the logs, I replaced some of the parts of the paths to my project location and also my username with ******* for privacy.

Current Result

Errors "Couldn't start client Language Support for Java" and "Couldn't start client Language Support for Java (Syntax Server)".

Expected Result

No error when loading vscode Java extension.

Additional Informations

[JLP04]

I believe that the error is from this part of client.log:

{ message: 'Error data: "java.lang.RuntimeException: java.lang.reflect.InvocationTargetException\\n\\tat org.eclipse.lsp4j.jsonrpc.services.GenericEndpoint.lambda$null$0(GenericEndpoint.java:67)\\n\\tat org.eclipse.lsp4j.jsonrpc.services.GenericEndpoint.request(GenericEndpoint.java:120)\\n\\tat org.eclipse.lsp4j.jsonrpc.RemoteEndpoint.handleRequest(RemoteEndpoint.java:261)\\n\\tat org.eclipse.lsp4j.jsonrpc.RemoteEndpoint.consume(RemoteEndpoint.java:190)\\n\\tat org.eclipse.jdt.ls.core.internal.ParentProcessWatcher.lambda$0(ParentProcessWatcher.java:123)\\n\\tat org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer.handleMessage(StreamMessageProducer.java:194)\\n\\tat org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer.listen(StreamMessageProducer.java:94)\\n\\tat org.eclipse.lsp4j.jsonrpc.json.ConcurrentMessageProcessor.run(ConcurrentMessageProcessor.java:113)\\n\\tat java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)\\n\\tat java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)\\n\\tat java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)\\n\\tat java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)\\n\\tat java.base/java.lang.Thread.run(Thread.java:832)\\nCaused by: java.lang.reflect.InvocationTargetException\\n\\tat jdk.internal.reflect.GeneratedMethodAccessor7.invoke(Unknown Source)\\n\\tat java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)\\n\\tat java.base/java.lang.reflect.Method.invoke(Method.java:564)\\n\\tat org.eclipse.lsp4j.jsonrpc.services.GenericEndpoint.lambda$null$0(GenericEndpoint.java:65)\\n\\t... 12 more\\nCaused by: java.lang.IllegalArgumentException: URI is not absolute\\n\\tat java.base/java.net.URL.fromURI(URL.java:719)\\n\\tat java.base/java.net.URI.toURL(URI.java:1139)\\n\\tat org.eclipse.jdt.ls.core.internal.RuntimeEnvironment.getJavadocURL(RuntimeEnvironment.java:142)\\n\\tat org.eclipse.jdt.ls.core.internal.JVMConfigurator.configureJVMs(JVMConfigurator.java:107)\\n\\tat org.eclipse.jdt.ls.core.internal.JVMConfigurator.configureJVMs(JVMConfigurator.java:96)\\n\\tat org.eclipse.jdt.ls.core.internal.handlers.BaseInitHandler.handleInitializationOptions(BaseInitHandler.java:120)\\n\\tat org.eclipse.jdt.ls.core.internal.handlers.InitHandler.handleInitializationOptions(InitHandler.java:72)\\n\\tat org.eclipse.jdt.ls.core.internal.handlers.BaseInitHandler.initialize(BaseInitHandler.java:64)\\n\\tat org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer.initialize(JDTLanguageServer.java:230)\\n\\t... 16 more\\n"\n' + '\n', level: 'info', timestamp: '2021-02-21 11:53:53.300' }

[testforstephen]

"javadoc": "/Library/Java/JavaVirtualMachines/jdk-15.0.2.jdk/Contents/Home/docs/api"

The exception points out the failure is from invalid javadoc URL. Could you comment out the javadoc config for JDK 15 in your user setting?

@snjeza What's the correct format to configure the javadoc in "java.configuration.runtimes" setting?

[JLP04]

"javadoc": "/Library/Java/JavaVirtualMachines/jdk-15.0.2.jdk/Contents/Home/docs/api"

The exception points out the failure is from invalid javadoc URL. Could you comment out the javadoc config for JDK 15 in your user setting?

@snjeza What's the correct format to configure the javadoc in "java.configuration.runtimes" setting?

Commenting it out seems to fix it for now but I do want to figure out how to fix that javadoc URL.

[JLP04]

I think I managed to get it working by replacing "javadoc": "/Library/Java/JavaVirtualMachines/jdk-15.0.2.jdk/Contents/Home/docs/api" with "javadoc": "file:///Library/Java/JavaVirtualMachines/jdk-15.0.2.jdk/Contents/Home/docs/api". I didn't realize it was supposed to be a URL, I thought it could also be a local path.

[testforstephen]

Good to know you figured it out. Yes, there is room for us to improve this. Considering the peer keys in this setting support a local path, but not for javadoc is a bit confusing. Also the invalid URL should not break the starting of Java tooling itself.

[snjeza]

What's the correct format to configure the javadoc in "java.configuration.runtimes" setting?

You can try https://docs.oracle.com/en/java/javase/15/docs/api/

[JLP04]

Thanks