src/java.desktop/unix/classes/sun/awt/X11/XTaskbarPeer.java

@@ -30,10 +30,11 @@
 import java.awt.peer.TaskbarPeer;
 import java.awt.event.ActionEvent;
 
 import sun.awt.UNIXToolkit;
 import java.security.AccessController;
+import java.security.PrivilegedAction;
 import sun.security.action.GetPropertyAction;
 
 final class XTaskbarPeer implements TaskbarPeer {
 
     private static boolean nativeLibraryLoaded = false;

@@ -66,10 +67,16 @@
     XTaskbarPeer() {
         initWithLock();
     }
 
     static boolean isTaskbarSupported() {
+        String de = AccessController.doPrivileged(
+                        (PrivilegedAction<String>) ()
+                                -> System.getenv("XDG_CURRENT_DESKTOP"));
+        if (de == null || !de.equals("Unity")) {
+            return false;
+        }
         initWithLock();
         return nativeLibraryLoaded;
     }
 
     @Override