Use the java_home info exposed by vscode-java to launch debuggee program (#432)

Signed-off-by: Jinbo Wang <[email protected]>

Author: testforstephen

package-lock.json

@@ -391,11 +391,8 @@
     "vscode": "^1.1.21"
   },
   "dependencies": {
-    "expand-home-dir": "0.0.3",
-    "find-java-home": "^0.2.0",
     "lodash": "^4.17.10",
     "opn": "^5.3.0",
-    "path-exists": "^3.0.0",
     "vscode-extension-telemetry": "0.0.18",
     "vscode-extension-telemetry-wrapper": "^0.3.1"
   }

package.json

@@ -1,11 +1,7 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT license.
 
-import * as expandHomeDir from "expand-home-dir";
-import * as findJavaHome from "find-java-home";
 import * as opn from "opn";
-import * as path from "path";
-import * as pathExists from "path-exists";
 import * as vscode from "vscode";
 import { logger, Type } from "./logger";
 
@@ -114,24 +110,15 @@ export function formatErrorProperties(ex: any): IProperties {
     return properties;
 }
 
-export function getJavaHome(): Promise<string> {
-    const EXE_SUFFIX = process.platform.startsWith("win") ? ".exe" : "";
-    return new Promise((resolve, reject) => {
-        let javaHome: string = readJavaConfig() || process.env.JDK_HOME || process.env.JAVA_HOME;
-        if (javaHome) {
-            javaHome = expandHomeDir(javaHome);
-            if (pathExists.sync(javaHome) && pathExists.sync(path.resolve(javaHome, "bin", `javac${EXE_SUFFIX}`))) {
-                return resolve(javaHome);
-            }
+export async function getJavaHome(): Promise<string> {
+    const extension = vscode.extensions.getExtension("redhat.java");
+    try {
+        const extensionApi = await extension.activate();
+        if (extensionApi && extensionApi.javaRequirement) {
+            return extensionApi.javaRequirement.java_home;
         }
+    } catch (ex) {
+    }
 
-        findJavaHome((err, home) => {
-            resolve(err ? "" : expandHomeDir(home));
-        });
-    });
-}
-
-function readJavaConfig(): string {
-    const config = vscode.workspace.getConfiguration();
-    return config.get<string>("java.home", null);
+    return "";
 }