import java.util.List; import lombok.Builder; @Builder(toBuilder = true) @lombok.experimental.Accessors(prefix = "m") class BuilderWithToBuilder<T> { private String mOne, mTwo; @Builder.ObtainVia(method = "rrr", isStatic = true) private T foo; @lombok.Singular private List<T> bars; public static <K> K rrr(BuilderWithToBuilder<K> x) { return x.foo; } } @lombok.experimental.Accessors(prefix = "m") class ConstructorWithToBuilder<T> { private String mOne, mTwo; private T foo; @lombok.Singular private com.google.common.collect.ImmutableList<T> bars; @Builder(toBuilder = true) public ConstructorWithToBuilder(String mOne, @Builder.ObtainVia(field = "foo") T baz, com.google.common.collect.ImmutableList<T> bars) { } }