Can you use Lombok toBuilder on an Abstract Class?

UpdatedDecember 30, 2022

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Can you use Lombok toBuilder on an Abstract Class?

Joseph Gan

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Setup

To make it simple, we only have an abstract class with 2 subclasses, and a couple of fields.

@SuperBuilder(toBuilder = true) public abstract class AddressDO { private String id; private String street; private String postalCode; private String unit; } @SuperBuilder(toBuilder = true) public class HomeAddressDO extends AddressDO { private boolean isRental; } @SuperBuilder(toBuilder = true) public class OfficeAddressDO extends AddressDO { private String building; }

Now, imagine we have a method that takes in AddressDO as the argument

public AddressDO createAddress(AddressDO addressDO) { // 1 return addressDO; }

We would like to call toBuilder on addressDO to define some fields

Resolution

So how can we resolve this?

public abstract class AddressDO { public abstract AddressDOBuilder<?, ?> toBuilder(); // added this // omitted }

We create an abstract toBuilder method which will ensure that all subclasses also implement this method.

This is what happens if the subclass did not implement toBuilder method

The type HomeAddressDO must implement the inherited abstract method AddressDO.toBuilder()

And now, if we try again

Can you use Lombok toBuilder on an Abstract Class?

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More from this blog

Context

Setup

Problem

Resolution

Limitation

Conclusion

Source Code