Fix 52: "EEXIST:file already exists" raises during creating java project (#61)

* Fix bug 52: "EEXIST:file already exists" raises during creating java project, using Promise.all will cause the racing of creating the target folder.

Author: andxu

src/controllers/projectController.ts

@@ -50,14 +50,17 @@ export class ProjectController {
     }
 
     private async scaffoldJavaProject(basePath: string, projectName: string, javaVersion: number): Promise<boolean> {
-        const projectFile: string = path.join(basePath, projectName, ".project");
-        const extensionPath: string = this.context.extensionPath;
+        const projectRoot: string = path.join(basePath, projectName);
+        const templateRoot: string = path.join(this.context.extensionPath, "templates");
+        const projectFile: string = path.join(projectRoot, ".project");
         try {
+            await fse.ensureDir(projectRoot);
+
             await Promise.all([
-                fse.copy(path.join(extensionPath, "templates", "App.java.sample"), path.join(basePath, projectName, "src", "app", "App.java")),
-                fse.copy(path.join(extensionPath, "templates", `Java${javaVersion}`), path.join(basePath, projectName)),
-                fse.copy(path.join(extensionPath, "templates", ".project"), projectFile),
-                fse.ensureDir(path.join(basePath, projectName, "bin")),
+                fse.copy(path.join(templateRoot, "App.java.sample"), path.join(projectRoot, "src", "app", "App.java")),
+                fse.copy(path.join(templateRoot, `Java${javaVersion}`), projectRoot),
+                fse.copy(path.join(templateRoot, ".project"), path.join(projectRoot, ".project")),
+                fse.ensureDir(path.join(projectRoot, "bin")),
             ]);
 
             // replace the project name with user input project name

templates/App.java.sample

@@ -1,8 +1,7 @@
 package app;
 
 public class App {
-	public static void main(String[] args) throws Exception {
-		System.out.println("Hello Java");
-	}
-
+    public static void main(String[] args) throws Exception {
+        System.out.println("Hello Java");
+    }
 }