Fix singleton to be thread safe

nroduit · Feb 25, 2024 · 581b6f7 · 581b6f7
1 parent 39103f5
commit 581b6f7
Showing 1 changed file with 5 additions and 4 deletions.
diff --git a/weasis-core/src/main/java/org/weasis/core/api/service/UICore.java b/weasis-core/src/main/java/org/weasis/core/api/service/UICore.java
@@ -136,11 +136,12 @@ public boolean willGainFocus(CDockable dockable) {
     FileUtil.readProperties(new File(dataFolder, "persistence.properties"), localPersistence);
   }
 
+  private static class Holder {
+    private static final UICore INSTANCE = new UICore();
+  }
+
   public static UICore getInstance() {
-    if (INSTANCE == null) {
-      INSTANCE = new UICore();
-    }
-    return INSTANCE;
+    return Holder.INSTANCE;
   }
 
   private void readSystemPreferences(BundleContext context) {