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Thread: Loading different version of jar lib from servlet

  1. #1
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    Default Loading different version of jar lib from servlet

    I have several third party JARs which will be used by my webapps. These JAR files are actually available in different versions.

    E.g.
    Version 1.0 JARs
    /opt/lib/third-party-jars/1.0/3rdparty1.jar
    /opt/lib/third-party-jars/1.0/3rdparty2.jar

    Version 2.0 JARs
    /opt/lib/third-party-jars/2.0/3rdparty1.jar
    /opt/lib/third-party-jars/2.0/3rdparty2.jar

    Is it possible to load a different version of library dynamically before the servlet get loaded? Is any framework able to do this without changing my existing code?

    public class Servlet1 extends HttpServlet {

    protected void doPost(....) {
    MyBusinessLogic businessLogic = new MyBusinessLogic();
    businessLogic.run() // My business logic spawns here which will start involving third-party classes
    }
    }

    Or is it possible to load version 1.0 or 2.0 library dynamically in the code before my business logic get invoked? One approach I can come up is using custom classloader and "setContextClassLoader" but this requires to refactor all my business logic using reflection. This will be a huge effort. I am trying not to change my existing business logic code.


  2. #2
    Super Moderator Sean4u's Avatar
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    Default Re: Loading different version of jar lib from servlet

    How do you determine which client gets which version of the software?

  3. #3
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    Default Re: Loading different version of jar lib from servlet

    Hi,
    I ll suggest better you use maven project for such requirement.

    bean factory
    Last edited by abani; December 18th, 2011 at 02:04 AM.

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