Use default implementation for this interface

core/src/main/java/hudson/model/AbstractItem.java

@@ -523,10 +523,6 @@ public abstract class AbstractItem extends Actionable implements Item, HttpDelet
         }
     }
 
-    public Descriptor getDescriptorByName(String className) {
-        return Jenkins.getInstance().getDescriptorByName(className);
-    }
-
     /**
      * Accepts the new description.
      */

core/src/main/java/hudson/model/Computer.java

@@ -1624,11 +1624,6 @@ public /*transient*/ abstract class Computer extends Actionable implements Acces
         }
     }
 
-    @Override
-    public Descriptor getDescriptorByName(String className) {
-        return Jenkins.getInstance().getDescriptorByName(className);
-    }
-
     /**
      * A value class to provide a consistent snapshot view of the state of an executor to avoid race conditions
      * during rendering of the executors list.

core/src/main/java/hudson/model/DescriptorByNameOwner.java

@@ -23,6 +23,8 @@
  */
 package hudson.model;
 
+import jenkins.model.Jenkins;
+
 /**
  * Adds {@link #getDescriptorByName(String)} to bind {@link Descriptor}s to URL.
  * Binding them at some specific object (instead of {@link jenkins.model.Jenkins}), allows
@@ -46,5 +48,7 @@ public interface DescriptorByNameOwner extends ModelObject {
      * @param id
      *      Either {@link Descriptor#getId()} (recommended) or the short name.
      */
-    Descriptor getDescriptorByName(String id);    
+    default Descriptor getDescriptorByName(String id) {
+        return Jenkins.getInstance().getDescriptorByName(id);
+    }
 }

core/src/main/java/hudson/model/Run.java

@@ -1015,11 +1015,6 @@ public abstract class Run <JobT extends Job<JobT,RunT>,RunT extends Run<JobT,Run
         return id != null ? id : Integer.toString(number);
     }
     
-    @Override
-    public @CheckForNull Descriptor getDescriptorByName(String className) {
-        return Jenkins.getInstance().getDescriptorByName(className);
-    }
-
     /**
      * Get the root directory of this {@link Run} on the master.
      * Files related to this {@link Run} should be stored below this directory.

core/src/main/java/hudson/model/User.java

@@ -935,10 +935,6 @@ public class User extends AbstractModelObject implements AccessControlled, Descr
         return r;
     }
 
-    public Descriptor getDescriptorByName(String className) {
-        return Jenkins.getInstance().getDescriptorByName(className);
-    }
-    
     public Object getDynamic(String token) {
         for(Action action: getTransientActions()){
             if(Objects.equals(action.getUrlName(), token))