Additional Tomcat excludes needed when using Jetty

[hban]

When using Jetty, excluding only spring-boot-starter-tomcat module is not enough since JDBC and WebSocket starters directly depend on certain Tomcat modules:

• spring-boot-starter-jdbc depends on org.apache.tomcat:tomcat-jdbc
• spring-boot-starter-websocket depends on org.apache.tomcat.embed:tomcat-embed-websocket

At the very least, documentation should be updated to mention excluding those Tomcat modules (either those exact modules, or whole tomcat and tomcat.embed groups).

[wilkinsona]

spring-boot-starter-jdbc depends on org.apache.tomcat:tomcat-jdbc

This one isn't a problem. This is Tomcat's connection pool that can be used in Jetty.

spring-boot-starter-websocket depends on org.apache.tomcat.embed:tomcat-embed-websocket

Thanks. We should do something about this one.

[philwebb]

Should we just include tomcat-embed-websocket in spring-boot-starter-tomcat? It's only 225k.