More tweaks to vscode-boot-java jvm finding.

Look for a sibling JDK if the found java exe belongs to a jre.

vscode-extensions/commons-vscode/src/jvm-util.ts

@@ -1,6 +1,7 @@
 import * as FS from 'fs';
 import * as Path from 'path';
 import * as ChildProcess from 'child_process';
+import { basename } from 'path';
 
 'use strict';
 
@@ -15,6 +16,11 @@ export interface JVM {
      */
     getJavaExecutable() : string
 
+    /**
+     * Path to the corresponding 'java home' for the executable.
+     */
+    getJavaHome() : string
+
     /**
      * Detect whether this JVM is a JDK
      */
@@ -46,6 +52,46 @@ export function findJvm(javaHome?: string) : Promise<JVM | null> {
     return Promise.resolve(null);
 }
 
+/**
+ * Like findJvm, but additionally, if the found JVM is not a JDK tries to
+ * find a companion JDK that may be installed alongside it. 
+ */
+export function findJdk(javaHome?: string) : Promise<JVM | null> {
+    return findJvm(javaHome).then(jvm => {
+        if (!jvm.isJdk()) {
+            console.log("found jvm is not a JDK");
+
+            //Try to find a 'sibling' JDK. 
+            //Mainly for windows where it is common to have side-by-side install of a jre and jdk, instead of a
+            //nested jre install inside of a jdk.
+            
+            //E.g.
+            //C:\ProgramFiles\Java\jdk1.8.0_161
+            //C:\ProgramFiles\Java\jre1.8.0_161
+
+            let javaExe = jvm.getJavaExecutable();
+            console.log("javaExe = ", javaExe);
+            // javaExe example: C:\ProgramFiles\Java\jre1.8.0_161\bin\java.exe
+            let jhome = jvm.getJavaHome();
+            console.log("jhome = ", jhome);
+            let basename : string = Path.basename(jhome);
+            console.log("basename = ", basename);
+            let altBasename : string = basename.replace("jre", "jdk");
+            console.log("altBasename = ", altBasename);
+            if (altBasename!==basename) {
+                let altHome = Path.join(Path.dirname(jhome), altBasename);
+                console.log("altHome = ", altHome);
+                if (FS.existsSync(altHome)) {
+                    let altExe = Path.resolve(altHome, Path.relative(jhome, javaExe));
+                    console.log("altExe = ", altExe);
+                    return new JavaExecutable(altExe, jvm.getMajorVersion());
+                }
+            }
+        }
+        return jvm;
+    });
+}
+
 /**
  * Find a 'java' exe by looking in the JAVA_HOME and PATH environment variables.
  * <p>

vscode-extensions/commons-vscode/src/launch-util.ts

@@ -18,7 +18,7 @@ import {WorkspaceEdit, Position} from 'vscode-languageserver-types';
 import {HighlightService, HighlightParams} from './highlight-service';
 import { log } from 'util';
 import { tmpdir } from 'os';
-import { JVM, findJvm } from './jvm-util';
+import { JVM, findJvm, findJdk } from './jvm-util';
 
 let p2c = P2C.createConverter();
 
@@ -36,6 +36,7 @@ export interface ActivatorOptions {
     jvmHeap?: string;
     workspaceOptions?: VSCode.WorkspaceConfiguration;
     classpath?: (context: VSCode.ExtensionContext, jvm: JVM) => string[];
+    preferJdk?: boolean;
 }
 
 type JavaOptions = {
@@ -73,7 +74,9 @@ export function activate(options: ActivatorOptions, context: VSCode.ExtensionCon
             }
         }
 
-        return findJvm().then(jvm => {
+        let findJRE = options.preferJdk ? findJdk : findJvm;
+
+        return findJRE().then(jvm => {
             if (!jvm) {
                 VSCode.window.showErrorMessage("Couldn't locate java in $JAVA_HOME or $PATH");
                 return;

vscode-extensions/vscode-boot-java/lib/Main.ts

@@ -19,6 +19,7 @@ export function activate(context: VSCode.ExtensionContext) {
         DEBUG: false,
         CONNECT_TO_LS: false,
         extensionId: 'boot-java',
+        preferJdk: true,
         launcher: (context: VSCode.ExtensionContext) => 'org.springframework.boot.loader.JarLauncher',
         classpath: (context: VSCode.ExtensionContext, jvm: commons.JVM) => {
             const classpath = [

vscode-extensions/vscode-boot-java/package.json

@@ -49,7 +49,7 @@
     "vsce-package": "vsce package"
   },
   "dependencies": {
-    "commons-vscode": "0.1.4",
+    "commons-vscode": "file:../commons-vscode/commons-vscode-0.1.4.tgz",
     "vscode-languageclient": "^3.4.5"
   },
   "devDependencies": {