Add required field only for OneToOne and ManyToOne field types.

This ensures that the 'required' is not present for OneToMany
and ManyToMany fields, since they do not have any optional
semantics.

javaee/impl/src/main/java/org/jboss/forge/addon/javaee/jpa/ui/NewFieldRelationshipWizardStep.java

@@ -62,6 +62,7 @@ public void initializeUI(UIBuilder builder) throws Exception
       Map<Object, Object> attributeMap = context.getAttributeMap();
       RelationshipType relationship = RelationshipType.valueOf(attributeMap.get(RelationshipType.class).toString());
       cascadeType.setValueChoices(EnumSet.range(CascadeType.PERSIST, CascadeType.DETACH));
+      boolean shouldAddRequired = false;
       switch (relationship)
       {
       case MANY_TO_MANY:
@@ -71,11 +72,17 @@ public void initializeUI(UIBuilder builder) throws Exception
       case MANY_TO_ONE:
       case ONE_TO_ONE:
          fetchType.setDefaultValue(FetchType.EAGER);
+         shouldAddRequired = true;
          break;
       default:
          throw new UnsupportedOperationException("Relationship " + relationship + " is not supported");
       }
-      builder.add(fetchType).add(inverseFieldName).add(required).add(cascadeType);
+      builder.add(fetchType).add(inverseFieldName);
+      if (shouldAddRequired)
+      {
+         builder.add(required);
+      }
+      builder.add(cascadeType);
    }
 
    @Override