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Showing content from https://github.com/redhat-developer/vscode-java/wiki/Troubleshooting below:

Troubleshooting · redhat-developer/vscode-java Wiki · GitHub

Here are a few instructions to help troubleshoot vscode-java.

In some occasions, deleting the Java Language Server workspace directory is helpful to go back to a clean slate. Generally speaking, on the different platforms, the VS Code user workspace storage area can be found under these locations :

• Windows : %APPDATA%\Code[ - Variant]\User\workspaceStorage\
• MacOS : $HOME/Library/Application Support/Code[ - Variant]/User/workspaceStorage/
• Linux : $HOME/.config/Code[ - Variant]/User/workspaceStorage/

New in 0.33.0

You can clean the workspace directory in the following way:

• Open the command palette (F1)
• select Java: Clean the Java Language Server Workspace
• select Restart and delete from the confirmation prompt

When the Java extension fails to work as expected, reading the logs is quite often a good way to understand what the problem is. The Java extension for VS Code is composed of 2 main parts, the client (VS Code) and the server (eclipse.jdt.ls), which means important information can be logged on both components.

It can be useful to trace the communications between VS Code and the Java Language Server. This can be achieved by enabling tracing in VS Code settings. The java.trace.server configuration can be set to verbose to provide full message logging in the Output view (select Language support for Java in the view menu). java.trace.server can take 3 values:

• off : no trace
• messages : logs message types exchanged between VS Code and the java server
• verbose : logs JSON messages exchanged between VS Code and the java server

When the Java extension fails to start, the first thing to look at is the VS Code console.

• Open the command palette (F1)
• select Developer: Toggle Developer Tools

The chrome developer tools will open. In the console tab, you will find messages like:

stderr: Mar 30, 2017 3:54:00 PM org.eclipse.lsp4j.jsonrpc.services.GenericEndpoint notify
WARNING: Unsupported notification method: $/setTraceNotification
vscode-icons is active!
Executing /Library/Java/JavaVirtualMachines/jdk-9.jdk/Contents/Home/bin/java -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=1044 --add-modules=ALL-SYSTEM 
--add-opens java.base/java.util=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED 
-Declipse.application=org.eclipse.jdt.ls.core.id1 -Dosgi.bundles.defaultStartLevel=4 
-Declipse.product=org.eclipse.jdt.ls.core.product -Dlog.protocol=true -Dlog.level=ALL 
-noverify -Xmx1G -make.it.crash -jar /Users/fbricon/Dev/projects/vscode-java/server/plugins/org.eclipse.equinox.launcher_1.4.0.v20161219-1356.jar 
-configuration /Users/fbricon/Dev/projects/vscode-java/server/config_mac 
-data /Users/fbricon/Library/Application Support/Code/User/workspaceStorage/bdea6df99b92680f795ba5759e96cfc4/redhat.java/jdt_ws
View server logs at /Users/fbricon/Library/Application Support/Code/User/workspaceStorage/bdea6df99b92680f795ba5759e96cfc4/redhat.java/jdt_ws/.metadata/plugins/.log
stderr: Unrecognized option: -make.it.crash
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

The Java Language Server log file might also contain other informations. To access it:

• Open the command palette (F1)
• select Java: Open Java Language Server log file

It will open the Java Language Server log file in a new tab.

Lombok support is enabled by default so that projects may take advantage of this immediately. However, in some cases, it may interfere with the reporting of some errors. Disabling it temporarily ("java.jdt.ls.lombokSupport.enabled": false) when attempting to uncover failures can help.

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