[JAVA] How to define an inner class bean

Development environment

Java 1.8.0
TERASOLUNA Server Framework for Java (5.4.1.RELEASE)
Spring Framework 4.3.14.RELEASE

Introduction

The back of the leaflet.

Try to define the inner class as a bean normally

Suppose you have defined the following class. This is a test of a method that adds two arguments ʻint` and returns.

`InnerTest.java`


@RunWith(SpringRunner.class)
public class InnerTest {

  @Inject
  Inner inner;

  @Test
  public void test() {
    int a = 1;
    int b = 2;
    //Assertion
    assertThat(inner.add(a, b), equalTo(a + b));
  }

  /**
   *Inner class for testing
   *
   */
  public class Inner {
    //Just add the values of the arguments and return
    public int add(int a, int b) {
      return a + b;
    }
  }
}

So, I think that the bean definition is as follows.

`InnerTest-context.xml`


<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
   ">
  <bean class="example.InnerTest.Inner" />
</beans>

When you run ...

`Error log`


Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'example.InnerTest' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1493)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1104)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066)
	at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:835)
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:741)
	... 43 common frames omitted

why! Bean defined!

When I googled, there was a person asking the same question.

How to create a Spring Bean of a Inner class?

--Make the inner class static.

--Connect with $ instead of.

If you do either of

How did you come to post this article?

I don't know if there is demand, but I needed it for the system I'm developing in business, so as a note: stuck_out_tongue :. For example, in a test, if you define the test Controller as a static inner class, the package will be only the test class and it will be easier to see: v :.