EqualsVerifier can be used in Java unit tests to verify whether the contract for the equals and hashCode methods is met.

Subclass: equals is not final.
Make your class or your equals method final, or supply an instance of a redefined subclass using withRedefinedSubclass if equals cannot be final.

There are three ways to solve this error, in order of decreasing preference:

  • Make the equals method (or even the whole class) final.

  • If you intend your equals method to be overridden, and you also want subclasses to add state that needs to be included in the contract, you have to use withRedefinedSubclass, as seen in the example below. If you decide to go down this path, I recommend reading the manual page about inheritance.

EqualsVerifier.forClass(Foo.class)
    .withRedefinedSubclass(SomeSubclass.class)
    .verify();
  • As a last resort, use .suppress(Warning.STRICT_INHERITANCE) to suppress the error message.

Updated: