Eclipse GlassFish is a complete application server that implements the Jakarta EE specification. GlassFish includes implementations of all required and optional Jakarta EE APIs, and passes all Jakarta EE TCKs. GlassFish also includes a complete administration console, clustering support, and other developer and production focused tools and features.
Tomcat 服務器是一個免費的開放源代碼的Web 應用服務器。GlassFish 是一款強健copy的商百業兼容應用服務度器.Tomcat 是Apache基金會下的，GlassFish 則不是。
Tomcat 運行時佔用的系統資源小，擴展性好，支持負載平衡與郵件服務等開發應用系統常用的功能知，較爲輕量級。GlassFish 相對來說“大”一些，在功能性能上可能更好一些，一般平時的開發，Tomcat 足矣道