Apparently this happens when overriding an interface method.

For example:

public interface Dao<T> extends JpaRepository<T, Long> {
...
@Transactional(propagation = Propagation.MANDATORY, rollbackFor = Throwable.class)
@Override
@NotNull
<S extends T> S save(@NotNull S entity);
...
}

@Validated
public interface MyDao extends Dao<My> { @Transactional(propagation = Propagation.MANDATORY, rollbackFor = Throwable.class) @Override @NotNull <S extends Project> S save(@NotNull S entity); }

A call to the save() method will cause a null pointer exception.

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