Inline WidgetFactory#createWidgetsFor and be a bit more lenient.

core/src/main/java/jenkins/widgets/HasWidgets.java

@@ -27,8 +27,10 @@ package jenkins.widgets;
 import edu.umd.cs.findbugs.annotations.CheckForNull;
 import hudson.widgets.Widget;
 import java.util.ArrayList;
+import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
+import java.util.logging.Level;
 import java.util.logging.Logger;
 import jenkins.security.stapler.StaplerAccessibleType;
 import jenkins.security.stapler.StaplerDispatchable;
@@ -48,13 +50,25 @@ public interface HasWidgets {
         List<Widget> result = new ArrayList<>();
         WidgetFactory
                 .factoriesFor(getClass(), Widget.class)
-                .forEach(wf -> result.addAll(wf.createWidgetsFor(this)));
+                .forEach(wf -> {
+                    try {
+                        Collection<Widget> wfResult = wf.createFor(wf.type().cast(this));
+                        for (Widget w : wfResult) {
+                            if (wf.widgetType().isInstance(w)) {
+                                result.add(w);
+                            } else {
+                                LOGGER.log(Level.WARNING, "Widget from {0} for {1} included {2} not assignable to {3}", new Object[] {wf, this, w, wf.widgetType()});
+                            }
+                        }
+                    } catch (RuntimeException e) {
+                        LOGGER.log(Level.WARNING, "Could not load all widgets from " + wf + " for " + this, e);
+                    }
+                });
         return Collections.unmodifiableList(result);
     }
 
     /**
      * Returns the named widget, or <code>null</code> if it does not exist.
-     *
      * Defaults to iterating on widgets and filtering based on the defined <code>urlName</code>.
      *
      * @param name the name of the widget within the current context.

core/src/main/java/jenkins/widgets/WidgetFactory.java

@@ -30,11 +30,8 @@ import hudson.ExtensionPoint;
 import hudson.widgets.Widget;
 import java.util.ArrayList;
 import java.util.Collection;
-import java.util.Collections;
 import java.util.List;
 import java.util.Set;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 import org.kohsuke.accmod.Restricted;
 import org.kohsuke.accmod.restrictions.NoExternalUse;
 
@@ -45,8 +42,6 @@ import org.kohsuke.accmod.restrictions.NoExternalUse;
  * @since TODO
  */
 public abstract class WidgetFactory<T extends HasWidgets, W extends Widget> implements ExtensionPoint {
-    private static final Logger LOGGER = Logger.getLogger(WidgetFactory.class.getName());
-
     /**
      * The type of object this factory cares about.
      * Declared separately, rather than by having {@link #createFor} do a check-cast,
@@ -84,19 +79,4 @@ public abstract class WidgetFactory<T extends HasWidgets, W extends Widget> impl
         return result;
     }
 
-    public Collection<W> createWidgetsFor(HasWidgets hasWidgets) {
-        try {
-            Collection<W> result = createFor(type().cast(hasWidgets));
-            for (W w : result) {
-                if (!widgetType().isInstance(w)) {
-                    LOGGER.log(Level.WARNING, "Widgets from {0} for {1} included {2} not assignable to {3}", new Object[] {this, hasWidgets, w, widgetType()});
-                    return Collections.emptySet();
-                }
-            }
-            return result;
-        } catch (RuntimeException e) {
-            LOGGER.log(Level.WARNING, "Could not load widgets from " + this + " for " + hasWidgets, e);
-            return Collections.emptySet();
-        }
-    }
 }