Use project's Java runtime to launch the application (#758)

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

Author: testforstephen

src/commands.ts

@@ -36,6 +36,8 @@ export const JAVA_RESOLVE_BUILD_FILES = "vscode.java.resolveBuildFiles";
 
 export const JAVA_IS_ON_CLASSPATH = "vscode.java.isOnClasspath";
 
+export const JAVA_RESOLVE_JAVAEXECUTABLE = "vscode.java.resolveJavaExecutable";
+
 export function executeJavaLanguageServerCommand(...rest) {
     // TODO: need to handle error and trace telemetry
     if (!utility.isJavaExtEnabled()) {

src/configurationProvider.ts

@@ -181,6 +181,7 @@ export class JavaDebugConfigurationProvider implements vscode.DebugConfiguration
                     });
                 }
 
+                config.javaExec = await lsPlugin.resolveJavaExecutable(config.mainClass, config.projectName);
                 // Add the default launch options to the config.
                 config.cwd = config.cwd || _.get(folder, "uri.fsPath");
             } else if (config.request === "attach") {

src/languageServerPlugin.ts

@@ -96,3 +96,7 @@ export async function isOnClasspath(uri: string): Promise<boolean> {
         return true;
     }
 }
+
+export function resolveJavaExecutable(mainClass, projectName) {
+    return commands.executeJavaLanguageServerCommand(commands.JAVA_RESOLVE_JAVAEXECUTABLE, mainClass, projectName);
+}