We are using Spring-Boot (2.7.x) with Jetty. Our dependency scanner told us, that we still have Tomcat dependencies in our dependency tree.

When looking at the POM for spring-boot-starter-jetty 2.7.1 I found out that spring-boot-starter-jetty depends on tomcat-embed-el. The tomcat-embed-el contains classes from the javax.el and org.apache.el package, so I thinks this is an/the Expression-Language-Parser implementation for Tomcat?

Anybody knows why? I downloaded the same version of Standalone-Jetty and it doesn't have this tomcat library.

See here for the dependencies https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-jetty/2.7.1

CodePudding user response：

In Spring Boot 2.5 the decision has been made to unify the EL implementation to the Apache one (See this issue).

Hence all containers now depend on the tomcat-embed-el as that is the Apache implementation (and regular API) for the Javax EL. Hence Jetty (and Undertow as well) have this small dependency on a Tomcat jar.