I am working with Spring MVC controller project. Below is my Controller and I have a constructor declared which I am specifically using for testing purpose.
@Controller public class TestController { private static KeeperClient testClient = null; static { // some code here } /** * Added specifically for unit testing purpose. * * @param testClient */ public TestController(KeeperClient testClient) { TestController.testClient = testClient; } // some method here }
Whenever I am starting the server, I am getting below exception -
No default constructor found; nested exception is java.lang.NoSuchMethodException:
But if I remove TestController
constructor then it works fine without any problem. What wrong I am doing here?
But if I add this default constructor then it starts working fine -
public TestController() { }
Spring cannot instantiate your TestController because its only constructor requires a parameter. You can add a no-arg constructor or you add @Autowired annotation to the constructor:
@Autowired public TestController(KeeperClient testClient) { TestController.testClient = testClient; }
In this case, you are explicitly telling Spring to search the application context for a KeeperClient bean and inject it when instantiating the TestControlller.
You must have to define no-args or default constructor if you are creating your own constructor.
You can read why default or no argument constructor is required.
why-default-or-no-argument-constructor-java-class.html
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