fixed bug with null pointer when server invokes shutdown() method

org.eclipse.buildship.gradleprop.ls/src/main/java/org/eclipse/buildship/gradleprop/ls/GradlePropertiesLanguageServer.java

@@ -30,55 +30,55 @@
  */
 public class GradlePropertiesLanguageServer implements LanguageServer, LanguageClientAware {
 
-  private final TextDocumentService textDocumentService;
-  private final GradlePropertiesTextDocumentService gradleTextDocumentService;
-  private final WorkspaceService workspaceService;
-  private LanguageClient languageClient;
+	private final TextDocumentService textDocumentService;
+	private final GradlePropertiesTextDocumentService gradleTextDocumentService;
+	private final WorkspaceService workspaceService;
+	private LanguageClient languageClient;
 
-  public GradlePropertiesLanguageServer() {
-    gradleTextDocumentService = new GradlePropertiesTextDocumentService();
-    this.textDocumentService = gradleTextDocumentService;
-    this.workspaceService = new GradlePropertiesWorkSpaceService();
-  }
+	public GradlePropertiesLanguageServer() {
+		gradleTextDocumentService = new GradlePropertiesTextDocumentService();
+		this.textDocumentService = gradleTextDocumentService;
+		this.workspaceService = new GradlePropertiesWorkSpaceService();
+	}
 
-  @Override
-  public void connect(LanguageClient client) {
-    languageClient = client;
-    gradleTextDocumentService.connect(client);
-  }
+	@Override
+	public void connect(LanguageClient client) {
+		languageClient = client;
+		gradleTextDocumentService.connect(client);
+	}
 
-  @Override
-  public CompletableFuture<InitializeResult> initialize(InitializeParams initializeParams) {
-    ServerCapabilities capabilities = new ServerCapabilities();
-    capabilities.setTextDocumentSync(TextDocumentSyncKind.Full);
+	@Override
+	public CompletableFuture<InitializeResult> initialize(InitializeParams initializeParams) {
+		ServerCapabilities capabilities = new ServerCapabilities();
+		capabilities.setTextDocumentSync(TextDocumentSyncKind.Full);
 
-    List<String> triggerCharacters = new ArrayList<String>();
-    triggerCharacters.add(".");
-    triggerCharacters.add("=");
+		List<String> triggerCharacters = new ArrayList<String>();
+		triggerCharacters.add(".");
+		triggerCharacters.add("=");
 
-    CompletionOptions options = new CompletionOptions(false, triggerCharacters);
-    capabilities.setCompletionProvider(options);
+		CompletionOptions options = new CompletionOptions(false, triggerCharacters);
+		capabilities.setCompletionProvider(options);
 
-    return CompletableFuture.supplyAsync(() -> new InitializeResult(capabilities));
-  }
+		return CompletableFuture.supplyAsync(() -> new InitializeResult(capabilities));
+	}
 
-  @Override
-  public CompletableFuture<Object> shutdown() {
-    return CompletableFuture.supplyAsync(null);
-  }
+	@Override
+	public CompletableFuture<Object> shutdown() {
+		return CompletableFuture.supplyAsync(Object::new);
+	}
 
-  @Override
-  public void exit() {
-  }
+	@Override
+	public void exit() {
+	}
 
-  @Override
-  public TextDocumentService getTextDocumentService() {
-    return textDocumentService;
-  }
+	@Override
+	public TextDocumentService getTextDocumentService() {
+		return textDocumentService;
+	}
 
-  @Override
-  public WorkspaceService getWorkspaceService() {
-    return workspaceService;
-  }
+	@Override
+	public WorkspaceService getWorkspaceService() {
+		return workspaceService;
+	}
 
 }