Create a launch configuration for eclipse-jdtls/eclipse.jdt.ls#799

Signed-off-by: Snjezana Peco <snjezana.peco@redhat.com>

Author: snjeza

.vscode/launch.json

@@ -27,6 +27,20 @@
 			},
 			"preLaunchTask": "npm: watch"
 		},
+		{
+			"name": "Launch Extension - JDTLS Client",
+			"type": "extensionHost",
+			"request": "launch",
+			"runtimeExecutable": "${execPath}",
+			"args": ["--extensionDevelopmentPath=${workspaceRoot}" ],
+			"stopOnEntry": false,
+			"sourceMaps": true,
+			"outFiles": [ "${workspaceRoot}/out/src/**" ],
+			"env": {
+				"JDTLS_CLIENT_PORT": "5036"
+			},
+			"preLaunchTask": "npm: watch"
+		},
 		{
 			"name": "Launch Tests",
 			"type": "extensionHost",

src/extension.ts

@@ -4,13 +4,14 @@ import * as path from 'path';
 import * as os from 'os';
 import * as fs from 'fs';
 import { workspace, extensions, ExtensionContext, window, StatusBarAlignment, commands, ViewColumn, Uri, CancellationToken, TextDocumentContentProvider, TextEditor, WorkspaceConfiguration, languages, IndentAction, ProgressLocation, InputBoxOptions, Selection, Position } from 'vscode';
-import { ExecuteCommandParams, ExecuteCommandRequest, LanguageClient, LanguageClientOptions, RevealOutputChannelOn, ServerOptions, Position as LSPosition, Location as LSLocation } from 'vscode-languageclient';
+import { ExecuteCommandParams, ExecuteCommandRequest, LanguageClient, LanguageClientOptions, RevealOutputChannelOn, ServerOptions, Position as LSPosition, Location as LSLocation, StreamInfo } from 'vscode-languageclient';
 import { collectionJavaExtensions } from './plugin';
 import { prepareExecutable, awaitServerConnection } from './javaServerStarter';
 import * as requirements from './requirements';
 import { Commands } from './commands';
 import { StatusNotification, ClassFileContentsRequest, ProjectConfigurationUpdateRequest, MessageType, ActionableNotification, FeatureStatus, ActionableMessage, CompileWorkspaceRequest, CompileWorkspaceStatus, ProgressReportNotification, ExecuteClientCommandRequest, SendNotificationRequest } from './protocol';
 import { ExtensionAPI } from './extension.api';
+import * as net from 'net';
 
 let oldConfig;
 let lastStatus;
@@ -80,7 +81,22 @@ export function activate(context: ExtensionContext): Promise<ExtensionAPI> {
 				let serverOptions;
 				let port = process.env['SERVER_PORT'];
 				if (!port) {
-					serverOptions = prepareExecutable(requirements, workspacePath, getJavaConfiguration());
+					let lsPort = process.env['JDTLS_CLIENT_PORT'];
+					if (!lsPort) {
+						serverOptions = prepareExecutable(requirements, workspacePath, getJavaConfiguration());
+					} else {
+						let connectionInfo = {
+							port: lsPort
+						};
+						serverOptions = () => {
+							let socket = net.connect(connectionInfo);
+							let result: StreamInfo = {
+								writer: socket,
+								reader: socket
+							};
+							return Promise.resolve(result);
+						};
+					}
 				} else {
 					// used during development
 					serverOptions = awaitServerConnection.bind(null, port);