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Editorial Team
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Asked: 2026-05-29T14:24:57+00:00

I’m using Tomcat 6.0.33 with Java 6. I have this servlet … public class

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I’m using Tomcat 6.0.33 with Java 6. I have this servlet …

public class SaveXmlServlet extends HttpServlet {

private CacheService cacheService;

public void init(ServletConfig config) throws ServletException {
    cacheService = CacheServiceLocator.cacheService();
}   // init

How can I redesign my servlet to …

  1. Take advantage of dependency injection so that a mocking framework like mockito can inject its own “cacheService” implementation
  2. Guarantee that there is only one instance of cacheservice in my jvm. Right now the line “CacheServiceLocator.cacheService()” guarantees this.

? I’m not using (or allowed to use) frameworks like Spring or Guice. Grateful for any thoughts on refactoring this. Thanks, – Dave

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1 Answer

  1. Editorial Team

    There are a few options, although I recommend smacking someone for not “letting” you use a framework. Two quickies; I’m sure there are others. I’d go the smacking route first.

    You can mock static classes using a combination of EasyMock/Mockito and, say, PowerMock. Technically you don’t need to change anything at all to get the in-test behavior you want.

    A class name provided by a servlet init parameter or JNDI resource could be used to create an instance of the cache locator. Providing a setter for the same allows a unit/etc. test to set it on the class.

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