No default constructor found nested exception is java lang NoSuchMethodException with Spring MVC

Question

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

User · Accepted Answer

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

User · Answer

In my case I forgot to add  RequestBody annotation to the method argument   public TestController  RequestBody KeeperClient testClient            TestController testClient   testClient

User · Answer

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

User · Answer

In my case  spring threw this because i forgot to make an inner class static    When you found that it doesnt help even adding a no-arg constructor  please check your modifier

User · Answer

If your environment is using both Guice and Spring and using the constructor  Inject  for example  with Play Framework  you will also run into this issue if you have mistakenly auto-completed the import with an incorrect choice of   import com google inject Inject    Then you get the same missing default constructor error even though the rest of your source with  Inject looks exactly the same way as other working components in your project and compile without an error   Correct that with   import javax inject Inject    Do not write a default constructor with construction time injection

[java] No default constructor found; nested exception is java.lang.NoSuchMethodException with Spring MVC?

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