@EqualsAndHashCode for a Subclass that inherits all identifying Attributes from its Superclass

[gigi.com]

Hello,

I'm currently struggeling on how to comfortably define @EqualsAndHashCode for a subclass that inherits its id attribute from its superclass:

Example:

@EqualsAndHashCode(of = "id", callSuper = false)
public class Site {
    private Integer id;
}

@EqualsAndHashCode(exclude = { "name" }, callSuper = true)
public class SubSite extends Site {
    private String name;
}

The superclass "Site" has an attribute that identifies it, namely "id". The subclass "SubSite" doesn't have any identifying attribute, but it ihnerits it from its superclass.

How can I now define the @EqualsAndHashCode annotation in the subclass in a comfortable way?

I tried the following out:

1. @EqualsAndHashCode(of = "id", callSuper = true)
-> This gives me a compiler warning in Eclipse ("This field does not exist, or would have been excluded anyway."), which I want to avoid. It is the same warning as I would write of = "dummy" or so.

2. @EqualsAndHashCode(exclude = { "name" }, callSuper = true)
-> This is dangerous when the next developer adds an additional attribute, e.g. "street", and forgets to adapt the exclude list.

3. add a dummy attribute to the subclass, and all other subclasses, which are many

-> No professional solution

Does anyone have another idea or is there missing a feature in Lombok?

I would wish to be able to define also super class attributes in the of-statemant in the case where callSuper is equals to true. Would this be a solution for future Lombok versions?

Ciao, Michael

[Martin Grajcar]

See my answer on https://stackoverflow.com/a/45395547/581205. In short of={} is the solution.

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