JavaEE-KapilKatyal

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31 Οκτ 2013 (πριν από 3 χρόνια και 9 μήνες)

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Java Enterprise
Edition (Java EE)
Application Servers

Kapil Katyal

WHIM

April 22, 2008

Overview


Introduction


Benefits of Using Java EE


Various Vendors


Other Alternatives


Conclusion


Typical Scenario


Create a web application that is secure, reliable and
can serve large quantities of data to thousands of
concurrent users.


Problem:


It needs to be in production within 6 months.


One Solution:


Hire lots of programmers to implement security,
scalability, database features


Difficult to find skillset


High cost to build and maintain application


Could be error prone

Key Observations
-

Java EE


Key observation made by application server vendors


Most web applications require similar features such as
database access, security, scalability, etc.


Provide these features that are fully tested in a container to
be leveraged by application developers


Similar to Java and C++ libraries


Allows application programmers to focus on business logic
instead of writing all features from scratch


Services Provide by Java EE


Web Services


RMI for distributed applications


Load balancing / clustering


Database integration


System management


Message
-
oriented middleware


Security


Dynamic redeployment


and many others….



Java EE Containers

Source: http://java.sun.com/javaee/5/docs/tutorial/doc/bnaay.html

Vendors


Commercial


IBM WebSphere Application Server


BEA WebLogic


Oracle OC4J


Open Source


JBoss Application Server


Apache Geronimo


Sun Glassfish


Apache Tomcat (only a web container)

Alternatives


Spring / Hibernate solution


New EJB specification is very similar to Hibernate


Spring and Hibernate are not based on specifications


Not as mature as Java EE


Microsoft .Net


Similar functionality


Forced into one platform and one vendor


One of the key features of web services is the
interoperability of .Net and Java EE.


Advantages and
Disadvantages


Advantages


Many, many features provided to the application developer


Shorter development cycle


Low cost of entry, especially when using open source
application servers


Disadvantages


Less flexibility on architecture


Troubleshooting can be very difficult, especially if you
uncover a bug in the vendor’s code


Sometimes your application doesn’t require all the features
available
-

this could hinder performance


Being addressed by open source community

Conclusion


Java EE is an open standard for building web
-
based
enterprise applications


Containers provide several features so that
application developers won’t have to write
everything from scratch


Java EE provides the consumer with several
choices between platform and vendor


Open source application servers are gaining a lot of
momentum due to low cost of entry and improving
quality


Additional Information


Java EE 5 Tutorial
-

http://java.sun.com/javaee/5/docs/tutorial/doc
/index.html


Apache Tomcat (only a servlet engine)
-

http://tomcat.apache.org/


JBoss Application Server
-

http://www.jboss.org/


Apache Geronimo
-

http://geronimo.apache.org/