The official artifact of Jakarta Expression Language is jakarta.el:jakarta.el-api as can be seen in their github project https://github.com/eclipse-ee4j/el-ri

https://github.com/spring-projects/spring-boot/blob/598b7a91376f4a350d617a6f1d9c5acb861a9b42/spring-boot-project/spring-boot-starters/spring-boot-starter-validation/build.gradle#L9

Comment From: leonard84

Nvm, API vs. Implementation