Issue when connecting to JAVA LSP

[pawansingh00]

Hi,

I am trying to connect to JAVA LSP - java language server (https://github.com/eclipse/eclipse.jdt.ls)

By changing this line --

monaco-languageclient/example/src/json-server-launcher.ts

Line 19 in 69f41d2

const serverConnection = server.createServerProcess('JSON', 'node', [extJsonServerPath]);

as below

const serverConnection = server.createServerProcess('JSON', 'java', [
            '-Declipse.application=org.eclipse.jdt.ls.core.id1', 
            '-Dosgi.bundles.defaultStartLevel=4',
            '-Declipse.product=org.eclipse.jdt.ls.core.product',
            '-Dlog.level=ALL',
            '-noverify',
            '-Xmx1G',
            '-jar /home/pawansingh/projects/eclipse.jdt.ls/org.eclipse.jdt.ls.product/target/repository/plugins/org.eclipse.equinox.launcher_1.6.400.v20210924-0641.jar',
            '-configuration /home/pawansingh/projects/eclipse.jdt.ls/org.eclipse.jdt.ls.product/target/repository/config_linux',
            '-data /home/pawansingh/projects/monaco-languageclient/example/src/java',        
            '--add-modules=ALL-SYSTEM',
            '--add-opens java.base/java.util=ALL-UNNAMED',
            '--add-opens java.base/java.lang=ALL-UNNAMED',
            '-DCLIENT_PORT=4000'
        ]);

and it seems to give the following error --

Need help with this.
Any example of integrating it with java/python/go LSP will do it too.

[CGNonofr]

Hello,

The error is pretty clear, and is not related to this library

You can't put 2 arguments in a single argument

[pawansingh00]

Hi @CGNonofr Thanks so much for the Quick reply --

The Error is gone after I changed it to --

        const serverConnection = server.createServerProcess('JSON', 'java', [
            '-Declipse.application=org.eclipse.jdt.ls.core.id1', 
            '-Dosgi.bundles.defaultStartLevel=4',
            '-Declipse.product=org.eclipse.jdt.ls.core.product',
            '-Dlog.level=ALL',
            '-noverify',
            '-Xmx1G',
            '-jar',
            '/home/pawansingh/projects/eclipse.jdt.ls/org.eclipse.jdt.ls.product/target/repository/plugins/org.eclipse.equinox.launcher_1.6.400.v20210924-0641.jar',
            '-configuration',
            '/home/pawansingh/projects/eclipse.jdt.ls/org.eclipse.jdt.ls.product/target/repository/config_linux',
            '-data',
            '/home/pawansingh/projects/monaco-languageclient/example/src/java',        
            '--add-modules=ALL-SYSTEM',
            '--add-opens java.base/java.util=ALL-UNNAMED',
            '--add-opens java.base/java.lang=ALL-UNNAMED',
            '-DCLIENT_PORT=4000'
        ]);

But, completion still doesn't show up --

It might not be an issue with this repository, but pretty much new to this LSP stuff, so not so sure on where to add it, adding it here in case anybody has faced similar thing while trying to connect to JAVA LSP with Monaco.

[CGNonofr]

I don't think you can autocomplete an inmemory file, you'll need it to be on the filesystem and probably even need a pom.xml.

Since it's not related to this library, do not hesitate to ask for help in stackoverflow or the jtd.ls project

[pawansingh00]

Thanks @CGNonofr

[pawansingh00]

In case if it is of any help to somebody.
This started to work by changing this line -

monaco-languageclient/example/src/client.ts

Line 28 in 69f41d2

model: monaco.editor.createModel(value, 'json', monaco.Uri.parse('inmemory://model.json')),

as below -

    model: monaco.editor.createModel(value, 'java', monaco.Uri.parse('file:///home/pawansingh/projects/monaco-languageclient/example/demo/java/file.java')),

after creating an empty file as this -- monaco-languageclient/example/demo/java/file.java

[pawansingh00]

Now I want to Use Syntax highlighting and other features provided by monaco editor and for that I want to replace -- monaco-editor-core with monaco-editor package, but ended-up with lot of errors.

Is it the correct way to just replace monaco-editor-core with monaco-editor and all the imports?

or do we have any pointer on how to go about replacing -- monaco-editor-core with monaco-editor

[rvignesh123]

Yes we should add file URI to show suggesions.

But the file loaded as non-project file releated to java. You can see that in your screenshot.
How to tell the JDT LS that this file path is belongs to Java project and how to show suggesions based on that ???

Could you find any ?

[rvignesh123]

I found it ... I did not passed rootUri and the --data path should not directly point to the repository it self, it should point the parent folder. It works

[chaitanya71998]

@rvignesh123

did not passed rootUri and the --data path should not directly point to the repository it self, it should point the parent folder. It works

here can you explain this in detail

[kaisalmen]

@chaitanya71998 Both options "rootUri" and "data" need to be set correctly when you start the Java Language Server.

[chaitanya71998]

Hi @kaisalmen
Had an issue with setting the rootUri and data path. I was maintaining java project in a server and getting paths from server. When i was giving the path came from server i was not getting suggestions. i was using @monaco-editor/react
can you share an example implementation