Spring Boot - Validations stopped working after upgrade from 2.2.5 to 2.3.0

Validation starter not included in web starters anymore.

The spring-boot-starter-validation is not a transitive dependency of spring-boot-starter-web and spring-boot-starter-webflux anymore.

Add this dependency for validations work.

<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-validation</artifactId></dependency>

According to spring boot 2.3.1 releasethere is no longer contains spring-boot-starter-validation with spring starter

how to add starter validation on

maven

<dependency>  <groupId>org.springframework.boot</groupId>  <artifactId>spring-boot-starter-validation</artifactId></dependency>

Gradle

dependencies {  ...  implementation 'org.springframework.boot:spring-boot-starter-validation'}

referee the release note

https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-2.3-Release-Notes#validation-starter-no-longer-included-in-web-starters

If your experiencing the issue of for example: not being able to see the validation errors (default-messages) returned back to the client, this is what you could do:

Top Solution 1:Simply add devtools. This should solve the issue. After I did this, all my binding-results were returned back to the client. I recommend you to test this out first:

<dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-devtools</artifactId></dependency>

Solution 2:

I found out that this is due to using Spring Boot 2.3+So if youre using Spring Boot 2.3 or higher, add this dependency in your pom.xml file as its no longer included within the 'web'-dependency itself.

<dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-validation</artifactId></dependency>

Now its necessary to set 'include binding errors' in java/resources/application.properties to "always". Same goes for 'message' as well although I think this is optional.

server.error.include-message=alwaysserver.error.include-binding-errors=always

Solution 3: (before I discovered solution 2 which could be helpful as well)

So I found out that this is due to having Spring boot 2.3+. But I could not find caution-messages on the new updated usage of @Valid in Spring Boot v2.3+.

So I ended up switching back to Spring boot v2.2.10 (latest version of 2.2) by adjusting the release version in the pom.xml file like so:

<parent>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-starter-parent</artifactId>    <version>2.2.10.RELEASE</version>    <relativePath/> <!-- lookup parent from repository --></parent>

This worked perfectly for me by rolling back to an older version. Although id like to update my Spring Boot version some day. (Revisit solution 1 & 2)