FIX: Json deserialize references

ebean-core/src/main/java/io/ebeaninternal/server/deploy/BeanDescriptor.java

@@ -3038,6 +3038,10 @@ public class BeanDescriptor<T> implements BeanType<T>, STreeType, SpiBeanType {
     return ebi.isReference() || referenceIdPropertyOnly(ebi);
   }
 
+  boolean hasIdPropertyOnly(EntityBeanIntercept ebi) {
+    return propertiesBaseScalar.length > 0 && ebi.hasIdOnly(idPropertyIndex);
+  }
+
   public boolean referenceIdPropertyOnly(EntityBeanIntercept ebi) {
     return idOnlyReference && ebi.hasIdOnly(idPropertyIndex);
   }
@@ -3055,6 +3059,12 @@ public class BeanDescriptor<T> implements BeanType<T>, STreeType, SpiBeanType {
     return versionPropertyIndex > -1 && ebi.isLoadedProperty(versionPropertyIndex);
   }
 
+  void setReferenceIfIdOnly(EntityBeanIntercept ebi) {
+    if (hasIdPropertyOnly(ebi)) {
+      ebi.setReference(idPropertyIndex);
+    }
+  }
+
   /**
    * Set the version value returning it in primitive long form.
    */

ebean-core/src/main/java/io/ebeaninternal/server/deploy/BeanDescriptorJsonHelp.java

@@ -152,6 +152,9 @@ final class BeanDescriptorJsonHelp<T> {
     }
     if (contextBean == null) {
       readJson.beanVisitor(bean, unmappedProperties);
+      if (!isNullOrZero(id)) {
+        desc.setReferenceIfIdOnly(bean._ebean_getIntercept());
+      }
     }
     if (path != null) {
       readJson.popPath();