Graph/7df8210a-0cfd-4c0a-8dbf-c7724946a9d7

Domainunvalidated

Inheritance

7df8210a-0cfd-4c0a-8dbf-c7724946a9d7

Inheritance

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Updated4/30/2026

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PERTAIN_TOSolution

This is done using the `payment_intent_data[setup_future_usage]` parameter — When you create the Checkout Session for the first payment. Outcome: the resulting Customer will have a PaymentMethod (pm_1234) attached automatically.

PERTAIN_TOProblem

if I create a checkoutSession with `mode = 'subscription'` then I do NOT find the `metadata` fields inside the `payment` Metadata. — Using the Stripe API, I realized that the checkoutSession creation is not consistent. Tension: the metadata can be found under `Subscriptions` Console. Outcome: for a subscription you want to use the `subscription_data[metadata]` parameter instead.

PERTAIN_TOProblem

I get a duplicate ID error — If I create a Person first and then try to create a PersonExtra with an existing Person's ID. Tension: it tries to persist both Person and PersonExtra.

PERTAIN_TORootCause

An object can have only one class, and JPA persistence identity is tied to that class rather than being shared across sibling subclasses

PERTAIN_TOSolution

Use separate entities with one-to-one relations instead of trying to create PersonExtra and PersonBasic with the same primary key

PERTAIN_TOAnswer

so-79797164

PERTAIN_TORootCause

The `Manager` class's `salary` member is hiding the member from the `Employee` class. — For the variable `m`, you initialize the `Manager.salary` member, but the `compareTo` method refers to the `Employee.salary` member. Tension: which is `null`. Outcome: the `compareTo` method refers to the `Employee.salary` member, which is `null`.

PERTAIN_TOProblem

I am getting this error. Tension: which should set the instance fields in each Manager and Employee object to 0 and 1, respectively. Outcome: There is no such thing as "variable overriding" in Java.

PERTAIN_TOSolution

In short, drop the `Manager.salary` member, and you should be fine:. Tension: since Java 5, the `Comparable` interface has been made generic. Outcome: You can save some casting boilerplate (and gain some compile-time safety) by defining your `Employee` as `Comparable`:.

PERTAIN_TOAnswer

so-79763948

PERTAIN_TOProblem

I would like to use an existent Parent instance to create a child instance — with lombok Annotations. Tension: with all parent fields filled, and be able to complement with child properties. Outcome: instead of a parent's "field by field" solution.

PERTAIN_TOSolution

Then you can write a `fromParent` in `Child` like this. Outcome: public static void fillValuesFromInstanceIntoBuilder(Parent instance, ParentBuilder b) { $fillValuesFromInstanceIntoBuilder(instance, b); }.

PERTAIN_TOAnswer

so-79514855

PERTAIN_TOProblem

From simply looking at the code, `get` giving an error is obvious to me. — raw type is used in `Sub extends Super`. Tension: For backward compatibility, Java allows a non-generic method in subclass to override a generic method in superclass as long as they have the same erasure. Outcome: `get` giving an error is obvious to me.

PERTAIN_TORootCause

having a subsignature is not sufficient for overriding — The signature of a method includes its name, type parameters, and formal parameter types. Outcome: `Object` is not a subtype of `T`.

PERTAIN_TOSolution

if `m1` overrides `m2`, the signature of `m1` must be a subsignature of the signature of `m2` — For `R1` and `R2` that are reference types. Tension: `Object get()` is not return-type-substitutable for `T get()`.

PERTAIN_TOAnswer

so-79404144

PERTAIN_TOSolution

Create a forwarding Iterator<SuperClass> wrapper that delegates hasNext() and next() to the underlying Iterator<SubClass>

PERTAIN_TOSolution

Cast to raw Iterator if you accept unchecked warnings

PERTAIN_TOAnswer

so-79390722

PERTAIN_TORootCause

the compiler will prevent you from forgetting to implement a pure virtual method in a subclass — require a user of my abstract base class.

PERTAIN_TOProblem

what if I want to require a user of my abstract base class to implement at least one out of several possible virtual methods? — sub-classing the `http_resource` object. Tension: the compiler enforce such a rule.

PERTAIN_TOSolution

you can instead template that function , and get access to `T` that way — If the user is supposed to construct those objects directly. Tension: there's a hack that makes it possible, but I doubt it's worth it.

PERTAIN_TOAnswer

so-79843830

PERTAIN_TOSolution

One way to achieve what you need, would be to remove the default empty implementations from `http_resource` — classes derived from it, that allow the user to implement only what they are interested in. Tension: implement only what they are interested in.

PERTAIN_TOAnswer

so-79843248

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