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Weblogic Application Server FAQs

61.What is the user of Log Filters in Weblogic?
Log filters:

    • Control the log messages that get published
    • Are based on the values of message attributes
    • Can be applied to different message destinations:
      • Server log file
      • Server memory buffer
      • Server standard out
      • Domain log file

62.What is the user of Network channels in Weblogic?
Adds flexibility to the networking configuration:

    • Multiple NICs for a single WLS server
    • Specific NICs or multiple port numbers on a NIC for specific WLS servers
    • Ability to use multiple IP addresses with each server
    • Ability to use a single IP address with multiple ports
    • Ability to configure the cluster multicast port number independently of the port numbers used by the cluster members
    • Multiple SSL configurations on one server

Network channels:

    • Define the set of basic attributes of a network connection to WLS
    • Can assign multiple channels to a single server (segment network traffic)
    • Can prioritize internal (non-URL) connections
    • Can separate incoming client traffic from internal server to server traffic in a domain
    • A “default” channel gets generated when a server is created.

63.How will you configure a web application in Weblogic?
Web applications are configured using the web.xml and weblogic.xml deployment descriptors, which:

      • Define the run-time environment
      • Map URLs to servlets and JSPs
      • Define application defaults such as welcome and error pages
      • Specify J2EE security constraints
      • Define work managers for applications
      • Set the context root for the application

      64.What information will be available in “web.xml” file?
      The web.xml file is a deployment descriptor that is used to configure the following:

        • Servlets and JSP registration
        • Servlet initialization parameters
        • JSP tag libraries
        • MIME type mappings
        • Welcome file list
        • Error pages
        • Security constraints and roles
        • Resources
        • EJB references

      65.What information will be available in “weblogic.xml” file?
      Using weblogic.xml, you can configure the following:

        • The application’s root context path
        • Application logging
        • Security role mappings
        • Advanced session settings
        • Session clustering
        • References to shared libraries
        • References to server resources (data sources, EJBs, and so on)
        • Work managers and threading
        • Virtual directories
        • JSP compiler options

      66.To configure a “web service” Applications in Weblogic, what are all the files required as a deployment descriptor?
      A Web service application:

        • Responds to HTTP client requests using the Simple Object Access Protocol (SOAP)
        • Uses the same structure as a Java EE Web application
        • Supports two additional deployment descriptors:
          • webservices.xml
          • weblogic-webservices.xml

      67. What is the Virtual directory Mappings? Which file you are going to provide these virtual directory mappings?
      Virtual directories:

        • Can be used to refer to physical directories
        • Enable you to avoid the need to hard code paths to physical directories
        • Allow multiple Web applications to share common physical directories for specific requests such as images
        • Decrease duplication of files across applications
        • Are configured in weblogic.xml

      Example:
      <virtual-directory-mapping>
         <local-path>c:/usr/gifs</local-path>
           <url-pattern>/images/*</url-pattern>
           <url-pattern>*.jpg</url-pattern>
      </virtual-directory-mapping>
      <virtual-directory-mapping>
           <local-path>c:/usr/common_jsps.jar</local-path>
           <url-pattern>*.jsp</url-pattern>
      </virtual-directory-mapping>

      68.What is the deployment descriptor file for ejb applications? What are all the information is going to provide in that file?
      Ejb application deployment descriptor file in Weblogic is “weblogic-ejb-jar.xml”.
      Using weblogic-ejb-jar.xml, you can configure the following:

        • Security role mappings
        • Advanced security settings
        • EJB clustering
        • EJB pooling and caching
        • Work managers and threading

      69.What is an Enterprise Application?

        • An enterprise application is a grouping of several resources into one deployable unit that is packaged in an .ear file.
        • These resources include:
          • Web applications (.war)
          • EJB applications (.jar)
          • Java applications (.jar)
          • Resource adapters (.rar)

      70.What is the user of Enterprise Applications?
      Use enterprise applications to:

        • Avoid namespace clashes
        • Declare application wide security roles
        • Deploy an application as one unit
        • Share application wide EJB resources
        • Configure local JDBC data sources
        • Configure local JMS resources
        • Configure local XML resources