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

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() {

    }
javaspringspring-mvcmodel-view-controller


Solution 1:[1]

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.

Solution 2:[2]

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.

Solution 3:[3]

In my case I forgot to add @RequestBody annotation to the method argument:

public TestController(@RequestBody KeeperClient testClient) {
        TestController.testClient = testClient;
    }

Solution 4:[4]

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.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Ricardo Veguilla
Solution 2 MK Yung
Solution 3 IKo
Solution 4 Manabu Tokunaga

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