[JAVA] How to define an inner class bean

Development environment


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.


public class InnerTest {

  Inner inner;

  public void test() {
    int a = 1;
    int b = 2;
    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.


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

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 :.

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