Spring Boot - javax Import statements not working correctly

Please refer the docs. https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-2.3-Release-Notes

As of #19550, Web and WebFlux starters do not depend on the validation starter by default anymore. If your application is using validation features, for example you find that javax.validation.* imports are not being resolved, you’ll need to add the starter yourself.

For Maven builds, you can do that with the following:

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

For Gradle, you will need to add something like this:

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

Add spring-boot-starter-data-jpa dependency

If you are using Maven add to pom.xml

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

If you are using Gradle add in build.gradle

compile "org.springframework.boot:spring-boot-starter-data-jpa"

for other refer this.

Perhaps this will help someone: apparently Java persistence api is renamed to Jakarta persistence. So you will have to import Jakarta persistence instead of javax.persistence.