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I would like to start using JEE6 in the next project that I have to work on at my job, but there is also a limitation (sort of): Tomcat 5.5 My question is, what improvements would bring GlassFish to the table (security/speed) vs the existing Tomcat(5.5) or an upgrade to the newer version 7?
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Tomcat is very popular for simple web applications, as compared to Glassfish. By comparison, Tomcat server administration is easier than Glassfish administration, since there are fewer moving parts in Tomcat. Both Tomcat and Glassfish are open sources and free, but they have different licenses.
Is Tomcat sufficient in terms of performance and memory management to use on production environments? Yes, it is.
GlassFish is a Java application server project created by Sun Microsystems that allows many developers to generate enterprise technologies that are convenient and scalable, as well as additional services that can be installed based on preference.
JBoss not only provides support for the Servlet and Java Server Page (JSP) specification, but also support for JAX-RS web services, Contexts and Dependency Injection (CDI), Java Message Service, JavaMail and Java Naming and Directory Interface. In contrast, Tomcat is simply a Servlet engine.
Q: My question is, what improvements would bring GlassFish to the table (security/speed) vs the existing Tomcat(5.5) or an upgrade to the newer version 7?
Tomcat 7 compared to Tomcat 5.5 supports newer version of JSR specifications. Therefore, if you wish to use for example Servlet 3.0 or Websockets, you don't have other choice but to upgrade the Tomcat version. See this link for the full list of Tomcat versions and supported specifications.
However, Tomcat is not Java EE container, but only a servlet container. In other words, if you plan to use full Java EE (which includes security and many other things), you have to switch from Tomcat to some of full Java EE application servers. Glassfish is one of them, others are TomEE (similar to Tomcat, so perhaps a good starting point), WildFly, IBM Websphere, Oracle Weblogic etc. Unfortunately, Oracle recently decided to abandon commercial support for Glassfish, so maybe it would be wise choice to go with some other application server if you would like to use it commercially.
One way or another, move from Tomcat 5.5 because it is a quite old version of Tomcat.
See also:
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