Failed to start Java language server: Message could not be parsed

[tsiyona]

Description

Hi, I am trying to add java language server extension to Theia version 0.11.0
Yet, it seems that the language server is not started/connected-to properly.
It looks like Theia is not recognizing the used language.

Can anyone help please?

Reproduction Steps

I added in theia/examples/browser/package.json an entry for the Java lang server:
"dependencies": {
...
"@theia/java": "^0.11.0"
}, ...

and re-built.

When I restart Theia, I get the following error:
Failed to start Java language server: Message could not be parsed.
See also attached image.

OS and Theia version:
Linux

Diagnostics:

[akosyakov]

Please use vscode java extension, Theia extension is deprecated and will be removed next months.

[tsiyona]

redhat.java ?

[akosyakov]

@tsiyona yes, look at root package how plugins can be installed

[akosyakov]

Also this image can help: https://github.com/theia-ide/theia-apps/tree/master/theia-java-docker

[tsiyona]

Do you mean I should add to theia/examples/browser/package.json, after "dependencies" section, the following?

"theiaPluginsDir": "plugins",
"theiaPlugins": {
"vscode-java-redhat": "https://github.com/redhat-developer/vscode-java/releases/download/v0.54.2/redhat.java-0.54.2.vsix"
},

and Theia, upon restart, will download the plugin to the 'theiaPluginsDir' ?

I did that, and it does not work.

[vince-fugnitto]

@tsiyona have you called the script download:plugins?

For example:

theia/package.json

Line 45 in 5034fbe

"prepare": "yarn prepare:travis && yarn prepare:build && yarn prepare:hoisting && yarn download:plugins",

[tsiyona]

For now, I downloaded an older version of redhat.java and put it manually undet the 'plugins' folder, and it works.

[vince-fugnitto]

The issue is no longer valid as @theia/java has been deprecated for some time now: #6933.