bug fix

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

@@ -241,8 +241,8 @@ public abstract class AbstractProject<P extends AbstractProject<P,R>,R extends A
      * List of all {@link Trigger}s for this project.
      */
     protected volatile DescribableList<Trigger<?>,TriggerDescriptor> triggers = new DescribableList<Trigger<?>,TriggerDescriptor>(this);
-    private AtomicReferenceFieldUpdater<AbstractProject,List> triggersUpdater
-            = AtomicReferenceFieldUpdater.newUpdater(AbstractProject.class,List.class,"triggers");
+    private AtomicReferenceFieldUpdater<AbstractProject,DescribableList> triggersUpdater
+            = AtomicReferenceFieldUpdater.newUpdater(AbstractProject.class,DescribableList.class,"triggers");
 
     /**
      * {@link Action}s contributed from subsidiary objects associated with