Force Java Compilation returns error

[baladreams]

Environment

• Operating System: MacOS
• JDK version: OpenJDK 11.0.7
• Visual Studio Code version: 1.55
• Java extension version: 0.79.1

Steps To Reproduce

1. Import a Java project (for example https://github.com/jitpack/gradle-simple )
2. Preform Java: Force Java Compilation (Incremental or Full)

Current Result

Error window showing operation failed

Expected Result

Java source is compiled

Additional Informations

enabling java.trace.server verbose logging shows this error

Trace - 9:01:59 PM] Sending request 'java/buildWorkspace - (33)'.
Params: [
    true
]


[Trace - 9:01:59 PM] Received response 'java/buildWorkspace - (33)' in 1ms. Request failed: Message could not be parsed. (-32700).
Error data: {
    "message": "java.lang.IllegalStateException: Expected a boolean but was BEGIN_ARRAY at line 1 column 67 path $.params"
}

Dev console does not have any detailed errors

This error seems have started occurring only recently.

[CarlPer]

I have the same issue, and I can not have autobuild set to true since it fails my maven builds

[fbricon]

I can reproduce the issue too. Independent of the build system (Gradle, Maven).

My gut feeling tells me this is caused by a change in either the LSP4J dependency on the server side, or, most likely, caused by the new vscode-languageclient 7.0.0 dependency in vscode-java

[testforstephen]

yes, looks like a breaking change in language client 7.0.0.

It adopts the Parameter Structures concept of jsonrpc, which requires the parameter of requests and notifications MUST be an array or an object.

If you're sending a request with a primitive type parameter such as boolean, then language client will automatically convert it as an array to the language server. That's why the server reports incompatible parameter type. See JSON_RPC implementation.

Fix:
We have to change the eclipse.jdt.ls code and make the parameter of buildWorkspace request to be Either<Boolean, boolean[]> instead of boolean. This can make it compatible with both old language client and new language client.

[fbricon]

@testforstephen should we open a ticket with lsp4j? Could this be an issue in other places

[rubensa]

Same error here. This is the relevant part from Remote Extension Host log:

[2021-05-06 14:35:31.260] [exthost] [error] Error: Message could not be parsed.
	at /home/user/.vscode-server/extensions/redhat.java-0.79.1/dist/extension.js:2:851523
	at /home/user/.vscode-server/extensions/redhat.java-0.79.1/dist/extension.js:2:851817
	at Immediate.<anonymous> (/home/user/.vscode-server/extensions/redhat.java-0.79.1/dist/extension.js:2:852182)
	at processImmediate (internal/timers.js:461:21) java.workspace.compile

[testforstephen]

@testforstephen should we open a ticket with lsp4j? Could this be an issue in other places

@fbricon, I opened an issue to ask lsp4j jsonrpc to destructure the wrapped byPosition array parameter. See eclipse-lsp4j/lsp4j#553.