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Glassfish Powered By Docstoc
					    The Glassfish
Application Server
       Carlton Northern
                CS775
                4/22/08
Overview
   Introduction
   Application Servers 101
   Web Application Demo
   Glassfish Features
   Netbeans and Glassfish Integration Demo
   Glassfish Web GUI Administration Demo
   Questions
   References
Introduction
   Glassfish is an open-source, Java Enterprise
    Edition (EE) compliant application server.
   The Sun Java System Application Server is
    Sun’s commercial offering of Glassfish.
   Glassfish V1 is the reference implementation
    of J2EE 1.4.
   Glassfish V2 is the reference implementation
    of Java EE 5 (in other words J2EE 1.5).
   But what is an application server?
Application Servers 101
   Application servers deliver applications to
    client-computers through HTTP.
   They differ from web servers in their
    extensive use of server-side dynamic content
    and integration with databases.
   Typically, application servers perform the
    business logic and data access for web
    applications.
   Example: Apache Tomcat, JBOSS
Three-Tier Architecture




    •http://en.wikipedia.org/wiki/Image:Overview_of_a_three-tier_application.png
Why Use an Application
Server?
   Question: Web servers can perform all the
    functionality of a an application server through
    extensions like Apache Axis, so why are application
    servers necessary?
   Answer: Application servers provide the necessary
    abstraction and decoupling from web servers to
    allow for greater interoperability and portability.
   App servers have standard ways to communicate to
    web servers, called servlets.
   App servers use containers to deploy applications.
Web App Deployment Demo
   http://localhost:8080/LastFlickrGWT/
Glassfish Features
   Support for:
     Java EE
     Ruby on Rails
     PHP
     AJAX
     Metro (a web services stack)
     CORBA
     Many many different frameworks
   Multiple levels of use.
   Clustering
     Grouping
     Load-Balancing
     Data Replication
   Complete Web GUI Administration
   Integration with NetBeans and Eclipse
Metro Web Services Stack
Web Services Interoperability
Technologies (WSIT)
Multiple Level Use
   Glassfish separates functionality so that the
    user only uses what is needed.
   Each profile builds upon the functionality of
    the previous.
       Developer profile used for development of
        applications.
       Enterprise profile used for deployment and high
        availability of applications without cluster support.
       Cluster profile used for clustering support.
Clustering
   Glassfish allows for the clustering of application
    server instances.
   Instances can be on the same or different machines.
   A cluster provides a runtime environment in which
    one or more Java EE applications can be run.
   Clusters provide high availability by using failover
    and load-balancing.
   Server instances can be added to a cluster, even
    while the application is running making clustering
    extremely scalable.
High Availability
   The High Availability feature in Glassfish
    provides 99.999% availability for applications.
   High Availability is offered through:
       High Availability Session Persistence
       High Availability Message Service
       RMI-IIOP Load-Balancing and Failover
High Availability Session
Persistence
   Provides high availability of HTTP requests
    and session data.
   Useful for mission critical web applications
    like shopping carts.
   Provides this through:
       In-memory replication of state data on other
        servers in the cluster
       Using High Availability Database (HADB) (outside
        of scope of this presentation)
In-memory Replication of
Session Data
   Replicates HTTP session data and stateful
    session beans (SFSBs) in the memory of
    server instances on other machines.
   Allows for preserving the state of an
    application over server failures.
   This requires the Group Management Service
    (GMS)
       GMS allows for notification of failures in a group
        and can take action.
High Availability Java Message
Service (JMS)
   JMS is an API that allow Java EE applications to
    create, send, receive and read messages.
   JMS allows message delivery semantics like once and
    only once delivery and also message ordering.
   JMS is made highly available through connection
    pooling, failover and clustering.
   Connection pooling is the act of caching frequently used
    connections to a service rather than discarding them
    after each use.
   JMS instances are clustered in a peer-to-peer
    relationship utilizing a common data store (HADB).
   These clusters utilize GMS and therefore can take
    advantage of failover.
Netbeans Glassfish Integration
   Demonstration in Netbeans
Web GUI Administration Demo
   http://localhost:4848/
Questions
   Q&A
References
   http://docs.sun.com/app/docs/coll/1343.5
   http://en.wikipedia.org/wiki/Three-
    tier_(computing)
   https://glassfish.dev.java.net/
   http://www.netbeans.org/

				
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