#1816 Fix for OneToMany relation to non-cached target bean.

src/main/java/io/ebeaninternal/server/deploy/BeanPropertyAssocMany.java

@@ -226,6 +226,7 @@ public class BeanPropertyAssocMany<T> extends BeanPropertyAssoc<T> implements ST
       desc.registerTable(targetDescriptor.getBaseTable(), this);
     }
   }
+
   /**
    * Return the underlying collection of beans.
    */
@@ -345,7 +346,7 @@ public class BeanPropertyAssocMany<T> extends BeanPropertyAssoc<T> implements ST
 
   /**
    * Add the loaded current bean to its associated parent.
-   *
+   * <p>
    * Helper method used by Elastic integration when loading with a persistence context.
    */
   @Override
@@ -967,6 +968,13 @@ public class BeanPropertyAssocMany<T> extends BeanPropertyAssoc<T> implements ST
     elementDescriptor.jsonWriteElement(ctx, element);
   }
 
+  /**
+   * Only cache Many Ids if the target bean is also cached.
+   */
+  public boolean isUseCache() {
+    return targetDescriptor.isBeanCaching();
+  }
+
   /**
    * A Many (element collection) property in bean cache to held as JSON.
    */