A Java Archive, or JAR file, contains all of the various components that make up a self-contained, executable Java application, deployable Java applet or, most commonly, a Java library to which any ...

Like other Java enterprise tools, Tomcat has migrated from the original Java EE specification to Jakarta EE. Tomcat 9 and earlier were based on Java EE; Tomcat 10 and later are based on Jakarta EE.