Glassfish, JBoss, Websphere, etc. are heavy weight application servers that support the EJB standard and many more advanced features out of the box, GlassFish is a collection of Java EE containers, one of which is a Web container, Tomcat is just a Web container.Compounding the advantages of GlassFish Server and GlassFish Web Container over Tomcat, the GlassFish Community has provided support for well-known features of Tomcat within GlassFish. The table below summarizes the Tomcat features that are provided by GlassFish and the additional GlassFish capabilities not currently provided by Tomcat. Here is a table with ClassFish vs tomcat features.
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