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everyone this is the next video in the series Oh a validation the first video we have covered basic validation the link of the video and the source code are given in the description box of this video go ahead and check out that in this video able to cover about the custom validator I do have our one validated how we can do that let's go ahead and get this time so this is the project user management and this is the user DTO which we validated and this is the input then you are adding this user to the system right and the annotation at the rate value and here at the rate value greater notation and this annotation is there for the path variable if there is any path wherever in your application you want to validate that for which you have to validated annotation rate for others you have to this min max length not null email validation believe this and now the this video we will talk about the custom validator how we can do the so now for the custom agate entry use keys I'm thinking that address should be some specific I have a list of address if it is not in one of those addresses and persist it should present the input side so let's go ahead and see how we can do that so first how we can start writing the custom validator so let's first we should see the structure of this annotation that they already have right so what is there so it is a custom annotation that they have written and this is the target retention repeatable with all these things constrained they have written right message gross payload so we should we should start like this right so first go ahead and create the Java class and pipe on address the one bulimic address validation and should be annotation type annotation so I am marking it so that at the rate interface is right here so for others it had some target retention and documented criteria so same thing I have to write so this comes when you are writing the custom annotations these things that you should use I so target where I want to use it right so for that I want to use it at place right so field field means I want to use it this place not any other so that is why we have target element at field and retention where I want it I want it at runtime all right so mean what was the retention then time right so that is why I have mentioned also that run time right and next I want it to be documented right and then next a notation we have constrained they this and here it takes one validated by you should specify the class so you have used this annotation there should be something to read this adaptation and validate the criteria right so I have to create one class address address validator now go ahead and create this class for it so new Clause this name at this now this class should implements constrained validator right so it is like it's taking two types forced the annotation name and then the type which value it will pick right so not address validate the thing so it should be name of the annotation validation right so now I should implement the methods that are there and so I do not want to implement the initialized is valid it's sufficient for us right so this is a that we need right so this is this thing that is type it is taking here an address validation is the name of the annotation that it has here right so it is the name of the annotation and inside allocation we are done with this one inside address validation in addition if I show you here it has masses groups and payload so I need hold this so this is how you can approach writing your custom validator all right so payload in this you can so here you know they have some default message I should I can have my own message so this is not the valid headless right so this is the customers at the Iman and groups they load their to be read by the validator hearing so that address phonetic that we are writing so this is it and now I have some list of redress and we store that list so I have some list of addresses I own that only so this is just my custom criteria that if address is not EXO addresses dot contains where you so whatever value whatever value of the address that you have given if it is not there in address it will reject those addresses right so ha now our custom validation this annotation custom validator annotation is ready and how to validate that address whatever is entered is also ready for us right so this is here how it will validate it so now let's go ahead and use this one right so I want this to be used here address validation right so yeah this is it we are done so I can give the custom message also right so if I give here I can give the message here cuz the message but if we are not giving that's not an issue it is going to pick the default that we have given anything so this is not the validates so if you are not giving this if you are not giving this default message then you have to provide the message right so now see it is throwing an exception right add missing annotation parameter so this is the case that this is how will you proceed right so this come these are the criteria and the under the know yeah so default message I even this only so you can approach rate so the way they that you want so I have shown you so this is it that we have to do interest validation and restylane it is also ready so start the application and check this if it is working or not so in our case we have taken the system parameter and you can go ahead further and have this address add some custom type and write the custom elector for that right so that's not an issue it's you saw the approach that's how you should proceed so you can all right any custom elected thirty more so if you facing any issue in writing so put that in the comment section I am always here to help you out right sue so application is running down so let me get this out and take this so we already have this to agree way right so from the last video were aware of this what is this all about so add user so I am going and trying to add the user right so name address know Adam one two three we are giving you but valid addresses are no idea n value so if I hit this other parameter sub okay so let me give also here so this is the valid one so if I hit this so I should get the exception right header bad request and this is not the valid address at the address point it is failing and this point you can understand type so how it is you can now understand how is this working so if I enter the valid address it will hit it properly right so this is how you can write the custom validator and you can go ahead and play around with this more about it next video I am going to explain you the pattern evaluate right so there are not null in length and they so there is one more annotation that is pattern annotation which is something related to the X how to do that we'll see in the next video right so take it away and one want to all the source code all the source code that I am explaining here is coming here like so on this repository can just blow on it and download it and play with this I'll see in the next video with the pattern matcher think so take it away