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EqualsAndHashCode annotation enables you to avoid having to manually write equals and hashcode methods in Java classes. Dev Environment: Apache maven v3. In there, you should be able to play around with all the source code used in this blog post. Don't be scared. For basic use cases, your IDE will implement these methods for you. Let's create a Person class with equals and hashcode implementation. Full code here. With lombok, most of this boilerplate code could easily be eliminated by adding a few annotations here and there. As you can notice, we only needed to add the annotation just above the class definition. This will automatically generate equals and hashcode methods based on the fields of your object. NOTE: Non-transient and non-static fields will be the ones used by default. Though we have the ability to specify which fields are used to generate equals and hashcode methods. Steve is currently a software developer at Vogue Book Consultancy Services Ltd and a technology author. He holds a Dip. He founded Read More. Project Lombok Tutorial. About The Author. Twitter LinkedIn Github. Steven Mwesigwa. You will start receiving notifications about our latest blog posts. Newsletter Join the weekly newsletter and never miss out on new tips, tutorials, and more.

@EqualsAndHashCode

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Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. One problem we have is that we are using EqualsAndHashCode because we need to have the equals method, but we don't use hashCode. Because of this multiple times we don't reach the limit for the coverage. In the Javadoc for the java. Object equals method we have this description:. This means hashCode is not really always necessary. On the other hand if we are using hashCode then we should have equals. The text was updated successfully, but these errors were encountered:. Not really That's no good idea. The proper solution for your coverage problem is to configure the coverage tool to ignore Lombok-generated methods. Configure Lombok to add an annotation and use it. Sorry, something went wrong. Adding 'lombok. I think that in this case ideally the annotation EqualsAndHashCode should have a onMethod attribute where I could specify that only those two methods would be annotated. Don't try to fit a square peg in a round hole you too! In this case you should either support 'onMethod' on all annotations instead of having it only on some of them. I agree with randakar and Maaartinus that adding this would be a bad idea. Allowing lombok users breaking the equals-hashcode contract let it be on purpose or by accident will contradict almost everything lombok aims for. If you need a special-purpose solution, then implement it. And if you don't want to write lengthy equals implementations, use EqualsBuilder from Apache Commons or similar helpers. It is not required that if two objects are unequal according to the equals java. Object method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables. This way, I can guarantee that hash codes never change when entities are persisted. IOW, you'd get a serious slowdown pretty everywhere. Some people claim that equality of entities should be content based, i. Other claim that nothing but the id and the class should be used. I followed the latter and added assert id! This way, my IDs never change when it matters as I test with assertion on. I obviously can't use transient entities as hash keys, but that's an acceptable price. If only 42 was a prime That's why I would make this option opt-in. When you write your equals and hashCode yourself, there is obviously no issue to discuss here. It'd be enough when it wasn't even. As all used hash tables I've ever seen in Java use power of two sizes, all you need is co-primality to two, i. Primality itself is irrelevant, 33 about as good as 31 and a bigger number would be somewhat better. Nothing is save with mutable keys. Anyway, you have to choose whether you want to use the ID or the 'business keys' in your equals IMHO using both would be crazy. When there are multiple transient entities, then I use a mapping like from itemNo to item , so there's no problem. There's pretty always a simple workaround. The persistent entities are more common. Note that with a constant hashCode , you could use a HashSet only as efficiently as List , and that'd be a problem with hundreds or thousands of entities. Did you test having a hand-written hashcode, annotated with Tolerate , and EqualsAndHashcode on the type? Should it? Given 52 comment , I'd say no. While I agree with all of you on both the usefulness and the necessity of generating both equals and hashCode at the same time, and ensuring uniformity across all test cases, I have to agree with ccronemberger too. The lombok frameworks main purpose is to add syntax in a configurable way. This should be consistent in itself too, and features should be as general as possible even if we don't see the usefulness, or would decide against using it. To be adaptable to different project requirements is the reason lombok has as many users as it does. Lombok hash implementation runs quickly into hashmap collisions when working with key-value in memory caches like Ignite, Redis, Memcached. The solution is to use apache HashCodeBuilder. So you still want lombok to cover the equals, but let developer customize hash implementation with HashCodeBuilder. Skip to content. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. You switched accounts on another tab or window. Dismiss alert. Notifications You must be signed in to change notification settings Fork 2. New issue. Sign up for GitHub. Jump to bottom. Copy link. All reactions. Maaartinus commented Jun 29, Actually, ignoring the method is a cop out too, I think. That way you can never be sure you have covered everything that needs covering. And ToStringVerifier on the tostring method. Unit test for each individual class is really really small - one line of actual code for standard value objects - and you get good coverage for it in return. Don't try to fit a square peg in a round hole. Either don't cover generated methods, or do. But be consistent about it. And seriously - testing those methods is not hard. If you do and Lombok ever breaks them you will immediately have test failures to warn you about it. It does have benefits. Especially since equalsverifier teaches you a lot about what this thing called 'equals' actually means.. Op vr 29 jun. For the record, I am not a member of the lombok team at all ;-. Maaartinus commented Dec 6, Maaartinus commented Dec 11, TreffnonX commented Dec 11, The purpose of Lombok is to kill boilerplate. Being adaptable is a side effect ;. Or change lombok to use directly EqualsAndHashCode behind the scenes, anyway it's apache license. Rawi01 commented Jul 9, Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment.

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