Fix warnings for Java 21

* use Locale.of
* surround Executor with try-with-resources

Author: akurtakov

e4tools/bundles/org.eclipse.e4.tools.emf.ui/src/org/eclipse/e4/tools/emf/ui/common/ComboViewerAutoComplete.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2014, 2017 TwelveTone LLC and others.
+ * Copyright (c) 2014, 2025 TwelveTone LLC and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -90,12 +90,13 @@ public void focusGained(FocusEvent e) {
 				// text will be unselected after we set the selection, so we
 				// need to delay the call
 				// THIS IS A WORKAROUND
-				final ScheduledThreadPoolExecutor executor = new ScheduledThreadPoolExecutor(1);
-				executor.schedule(
-						() -> dropDown.getCombo().getDisplay()
-						.syncExec(() -> dropDown.getCombo()
-								.setSelection(new Point(0, dropDown.getCombo().getText().length()))),
-						200, TimeUnit.MILLISECONDS);
+				try (ScheduledThreadPoolExecutor executor = new ScheduledThreadPoolExecutor(1)) {
+					executor.schedule(
+							() -> dropDown.getCombo().getDisplay()
+									.syncExec(() -> dropDown.getCombo()
+											.setSelection(new Point(0, dropDown.getCombo().getText().length()))),
+							200, TimeUnit.MILLISECONDS);
+				}
 			}
 		});
 	}

e4tools/bundles/org.eclipse.e4.tools.services/src/org/eclipse/e4/tools/services/impl/ResourceBundleHelper.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2012, 2017 Dirk Fauth and others.
+ * Copyright (c) 2012, 2025 Dirk Fauth and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -347,7 +347,7 @@ else if (localeParts[1].length() == 2) {
 			variant = localeParts[2];
 		}
 
-		return new Locale(language, country, variant);
+		return Locale.of(language, country, variant);
 	}
 
 	/**