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<@U3NCE6L8G> Did you try to map a List? I'm not getting

I haven't tried. Ill see if i can get it to work

Alright, I figured it out. Hibernate doesn't have any handling of Observables so we need to have getters and setters for List&lt;T&gt;. So you need to create those are add the annotations onto the getter function.

```

    @get:Transient
    val customersProperty: ObservableList&lt;Customer&gt; = FXCollections.observableArrayList()

 @OneToMany(fetch = FetchType.EAGER, cascade = [CascadeType.ALL])
    fun getCustomers(): List&lt;Customer&gt; = customersProperty.toList()

    fun setCustomers(customers: List&lt;Customer&gt;) {
        customersProperty.setAll(customers)
    }

```

Also note that you should make all fetchings eager because you don't want to make database calls on the FX Thread.

<@U3NCE6L8G> Hello, The edit function isn't working, error : org.springframework.orm.jpa.JpaSystemException: Exception occurred inside setter of com.github.bkenn.jpafx.model.Vendor.customers; nested exception is org.hibernate.PropertyAccessException: Exception occurred inside setter of com.github.bkenn.jpafx.model.Vendor.customers

Actually yeah. I do. I didn't test for updates. Doing it now.

Strange behavior. When I wrap the `this.customers.setAll(customers)`, inside the `setCustomers`, in a try-catch, I receive a `java.lang.UnsupportedOperationException: Operation is not supported for read-only collection`

Ok I think I have a solution. My update test has passed.

Until I am better acquainted with Hibernate's logic, here is one solution I found a way to update a @OneToMany relationship. We have to remove the `CascadeType.ALL` from `Vendor`'s `customers`. Then we have to save the customer entity before we add the `customer` to the pre-saved `vendor` and then we can save the `vendor`.

<https://github.com/bkenn/JpaBootFX.git> the updated version