With Immutables you can generate state of the art immutable objects and builders. Type-safe, null-safe and thread-safe, with no boilerplate. Generate builders for immutable objects and even plain static factory methods...
To reap the benefits of immutability in Java, we created an annotation processor to easily create simple and consistent value objects. You can think of it as Guava's Immutable Collections but for regular objects...
Java toolkit based around usage of immutable objects and fluent interfaces