What is Java Application Server & IBM WebSphere application server?
Application Server provides the entire necessary infrastructure to host enterprise application. It handles application operation between user request to backend business application like a database, messaging, etc.
Enterprise application, which is usually transactional based or heavily used, must have an application server with built-in redundancy, high availability, and performance oriented like WebSphere Application Server.
Application Server usually sits between Web Server and Database or another backend like messaging, etc.
Below is the typical diagram indicates application server located in the user requests.
WebSphere Application Server is supported on following platforms.
WebSphere provides configuration flexibility that can fit in any requirement in production or non-production environment within budget. Considering vast options, there could be various topologies, however; following three are most widely used.
1. Standalone topology
It’s basic topology where you install WebSphere on a single server. By implementing this, you will have Cell, Node, and Server (JVM) on a single machine, which has some of the following limitations.
Won’t be able to start server from admin console
No high availability
No load balancing
All administrative tasks by connecting to JVM
Probably this would be good for development or no critical non-production environment. Below is the typical server diagram for standalone topology.
2. Network Deployment topology
Probably the most used and advanced topology, which can have multiple JVM running on the same server or different server.
This is supported only with WebSphere Application Server Network Deployment edition.
The good thing about this topology is you can have all administrative tasks done including starting the JVM through DMGR console.
In this topology – DMGR and Node agent run as a separate process and it supports clustering for high-availability. Below is the basic diagram of ND topology.
3. Administrative Agent topology
In this topology, an additional process called administrative agent is created which helps to manage multiple standalone servers registered to administrative agent.
This allows an administrator to manage all registered nodes using administrative agent console.
This becomes very useful when you have multiple standalone servers, and you wish to perform administrative tasks including starting JVM through a console. Below diagram illustrates a basic administrative agent topology.
What’s new in WebSphere 8.5.5?
IBM released WebSphere Application Server 8.5 in June 2012 and 8.5.5 in June 2013 with some of the great features listed below.
HPEL – Binary logging which is faster than text logging. This helps in runtime performance.
Monitored directory support for faster edit-deploy-test cycles
JAVA SE7 – WAS 8.5 have the option to support Java 7 SE
Application Resiliency – WAS 8.5 ND is integrated with WebSphere virtual enterprise.
Health Management – Monitor the application server health and respond to the potential issues before an outage occurs.
SIP – Serviceability and troubleshooting enhancements to Session Initiation Protocol support more resilient processing of SIP sessions.