wrong method was implemented

core/src/main/java/hudson/model/queue/AbstractQueueTask.java

@@ -29,6 +29,7 @@ import hudson.model.Queue.Task;
 import hudson.security.ACL;
 import org.acegisecurity.Authentication;
 
+import javax.annotation.Nonnull;
 import java.util.Collection;
 import java.util.Collections;
 
@@ -62,9 +63,10 @@ public abstract class AbstractQueueTask implements Queue.Task {
 
     /**
      * This default implementation is the historical behaviour, but this is no longer desirable. Please override.
-     * See {@link Task#getIdentity()} for the contract.
+     * See {@link Task#getDefaultAuthentication()} for the contract.
      */
-    public Authentication getIdentity() {
+    @Nonnull
+    public Authentication getDefaultAuthentication() {
         return ACL.SYSTEM;
     }
 }