CAUSEWAY-3075: minor code quality

.gitignore

@@ -66,6 +66,9 @@ component/objectstore/xml/tmp/objects/
 component/objectstore/xml/xml/objects/
 component/objectstore/xml/tmp/tests/
 
+# backup files
+*.bak
+
 # log files
 *.log
 

core/metamodel/src/main/java/org/apache/causeway/core/metamodel/facets/DomainEventFacetAbstract.java

@@ -23,6 +23,7 @@
 import org.apache.causeway.core.metamodel.facetapi.Facet;
 import org.apache.causeway.core.metamodel.facetapi.FacetAbstract;
 import org.apache.causeway.core.metamodel.facetapi.FacetHolder;
+import org.apache.causeway.core.metamodel.spec.ObjectSpecification;
 
 import lombok.NonNull;
 
@@ -70,6 +71,13 @@ protected final void updateEventType(
         this.eventTypeOrigin = eventTypeOrigin;
     }
 
+    /**
+     * Called by meta-model post-processors, to honor domain object annotations on mixees.
+     * (required only, if this facet belongs to a mixed-in member)
+     */
+    public void initWithMixee(final ObjectSpecification mixeeSpec) {}
+
+
     @Override
     public void visitAttributes(final BiConsumer<String, Object> visitor) {
         super.visitAttributes(visitor);

core/metamodel/src/main/java/org/apache/causeway/core/metamodel/facets/actions/action/invocation/ActionDomainEventFacet.java

@@ -73,10 +73,7 @@ public ActionDomainEventFacet(
         domainEventHelper = DomainEventHelper.ofServiceRegistry(getServiceRegistry());
     }
 
-    /**
-     * Called by meta-model post-processors, to honor domain object annotations on mixees.
-     * (required only, if this facet belongs to a mixed-in member)
-     */
+    @Override
     public void initWithMixee(final ObjectSpecification mixeeSpec) {
         mixeeSpec
         .lookupFacet(ActionDomainEventDefaultFacetForDomainObjectAnnotation.class)

core/metamodel/src/main/java/org/apache/causeway/core/metamodel/facets/collections/collection/modify/CollectionDomainEventFacet.java

@@ -48,10 +48,7 @@ public CollectionDomainEventFacet(
         domainEventHelper = DomainEventHelper.ofServiceRegistry(getServiceRegistry());
     }
 
-    /**
-     * Called by meta-model post-processors, to honor domain object annotations on mixees.
-     * (required only, if this facet belongs to a mixed-in member)
-     */
+    @Override
     public void initWithMixee(final ObjectSpecification mixeeSpec) {
         mixeeSpec
         .lookupFacet(CollectionDomainEventDefaultFacetForDomainObjectAnnotation.class)

core/metamodel/src/main/java/org/apache/causeway/core/metamodel/facets/properties/property/modify/PropertyDomainEventFacet.java

@@ -80,10 +80,7 @@ public PropertyDomainEventFacet(
         domainEventHelper = DomainEventHelper.ofServiceRegistry(getServiceRegistry());
     }
 
-    /**
-     * Called by meta-model post-processors, to honor domain object annotations on mixees.
-     * (required only, if this facet belongs to a mixed-in member)
-     */
+    @Override
     public void initWithMixee(final ObjectSpecification mixeeSpec) {
         mixeeSpec
         .lookupFacet(PropertyDomainEventDefaultFacetForDomainObjectAnnotation.class)