Monday, 25 October 2010

Deployment : war, ear and jar files

Difference between ear, war and jar files.

Enterprise Application ( .ear )

An Enterprise Application consists of one or more of the following J2EE applications or modules:
  • Web applications
  • Enterprise Java Beans (EJB) modules
  • Resource Adapter modules
An Enterprise Application is packaged as an archive file with an .ear extension
you can say it's a collection of war & jar files

Web Application ( .war )
A Web application always includes the following files:
  • A servlet or JSP page, along with any helper classes.
  • A web.xml deployment descriptor, a J2EE standard XML document that configures the contents of a WAR file.
Web applications may also contain JSP tag libraries, static .html and image files, supporting classes and .jar files, and a weblogic.xml deployment descriptor, which configures WebLogic Server-specific elements for Web applications. 

Enterprise JavaBean ( .jar )

Enterprise JavaBeans (EJBs) are reusable Java components that implement business logic and enable you to develop component-based distributed business applications. EJB modules are packaged as archive files having a .jar extension.


Summary



Deployment units that are packaged using the jar utility have a specific file extension depending on the type:
  • EJBs and client archives are packaged as .jar files.
  • Web applications are packaged as .war files.
  • Resource adapters are packaged as .rar files.
  • Enterprise applications are packaged as .ear files, and can contain other Java EE modules such as EJBs, JDBC, JMS, Web Applications, and Resource Adapters.
  • Web Services can be packaged either as .war files or as .jar files, depending on whether they are implemented using Java classes or EJBs. Typically, the .war or .jar files are then packaged in an Enterprise Application .ear file.
  • Java EE libraries are packaged either as an Enterprise Application (.ear file) or as a standard Java EE module.
  • Client applications and optional packages are packaged as .jar files.
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9 comments:

  1. Anonymous8 March 2011 at 00:56

    Hi Mukesh,

    The information regarding war,ear,jar files cleared my doubts


    thanks a lot
    --------Kumara Guruparan R

    ReplyDelete
  2. Mukesh Negi14 March 2011 at 06:00

    It's my pleasure Kumara!!

    ReplyDelete
  3. Anonymous11 May 2011 at 23:53

    Why should one use multiple ear deployments for different application components? If they all include a set of common libraries, doesn't this introduce unnecessary redundancy?

    ReplyDelete
  4. Mukesh Negi24 May 2011 at 13:26

    this is the only good habit for common component(s), deploy as library.

    ReplyDelete
  5. naresh rayapati20 February 2013 at 03:00

    how to deploy jar,ear/war files in weblogicserver

    ReplyDelete
  6. Rajeev Bajpai6 September 2013 at 03:37

    This comment has been removed by the author.

    ReplyDelete
  7. kothapalli venkateswarlu26 September 2013 at 05:12

    i have 5 domains in my server so how many nodemanagers i need? this is interview question kindly reply asap

    ReplyDelete
    Replies
    1. Mukesh Negi22 October 2013 at 06:49

      node manager should be one. each host should have only one node manager, and all domains can enroll with the same node manager.

      Delete
  8. Neelakantam Gundralla17 January 2015 at 22:13

    hi mukesh,
    how to enroll all the domains with single node manager.if we have multiple domains in a single host.

    ReplyDelete

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