GlassFish is an application server project by Sun Microsystems for the Java Enterprise Edition (Java EE) platform. Sun is selling this as the Sun Java System Application Server 9.x. GlassFish is based on source code donated by Sun and Oracle Corporation's TopLink persistence system. It uses a derivative of Apache Tomcat as the servlet container for serving Web content, with an added component called Grizzly which uses Java NIO for scalability and speed. GlassFish is free software, dual-licensed under two free software licences: the Common Development and Distribution License (CDDL) and the GNU General Public License (GPL) with the classpath exception. [edit]
GlassFish is an application server project by Sun Microsystems for the Java Enterprise Edi...
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Apache Tomcat is a web container, or application server developed at the Apache Software F...
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While there are indeed several advantages to using GlassFish vs. Tomcat, it's probably useful to know that Sun is the original creator of Tomcat and that any application running today on Tomcat should run just fine (no modification whatsoever) on GlassFish.
• GF is an Open Source, Community Based implementation of Java EE 5.
• Java EE 5 is a huge improvement over earlier J2EE versions (J1 Keynotes).
• GF is Production Quality and has very Good Performance.
• GF is delivered in SJS AS 9.0, Java EE 5 SDK, and NetBeans 5.5.
• GF has already affected adoption and is getting analyst attention [1], [2].
• GF is used by other groups like in JEUS 6 Preview from TMaxSoft.
• GF has many goodies, including Java DB and Java Blueprints.
• GF is committed to your favorite framework.
• GF is at the forefront of JPA adoption.
• GF Web Services stack is very good and it is getting better and better.
• GF's Grizzly delivers top Web Tier performance and flexibility.
• GF has Developer Support, Training and more.
• GF supports AJAX and Scripting.
• GF has platform and tool SOA support, including JBI and BPEL.
• GF is used directly for the official Reference Implementation of Java EE 5.
• GF is the code base for the Sun Java System Application Server.
• GF will incorporate the enterprise features available today in SJS AS 8.x.
• Many components are in the Maven Repository; and more soon.
• We are already working on the next releases (more)
This is new and promising player on field of Open Source Application Servers.
It has powerful support from Sun corporation (include paid support) and included in Java EE SDK as default Java EE implementation.
And now upcoming GlassFish 3.0 looks very promising.