Inject primitive properties to Spring bean when using #Autowired? - spring

Question

try to inject myInt of the following through Spring
public class MyBean {
#Resource (name="myValue")
private int myInt;
Any idea? I have got the following post. But it don't work for me. I still get the following error message.
Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanNotOfRequiredTypeException: Bean named 'myValue' must be of type [int], but was actually of type [java.lang.Integer]
Detail:
The following is the test servlet that I have create for this testing.
#WebServlet("/myTestServlet")
public class myTestServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public myTestServlet() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doProcess(request);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doProcess(request);
}
private void doProcess(HttpServletRequest request)
{
WebApplicationContext applicationContext =
WebApplicationContextUtils.getWebApplicationContext(
((HttpServletRequest) request).getSession().getServletContext());
MyService service = applicationContext.getBean(MyService.class);
service.doPrint();
}
}
The following is service bean that I am using for this test.
public class MyService {
// #Autowired
// #Qualifier("myValue")
#Resource (name="myValue")
private int myInt;
public void doPrint ()
{
System.out.println("myInt is " + myInt);
}
}
The following is the applicationContext.xml that I am using
<context:annotation-config />
<bean id="myService" class="tsttst.MyService" >
</bean>
<!-- Global configuration -->
<bean id="myValue" class="java.lang.Integer" factory-method="valueOf">
<constructor-arg value="1000" />
</bean>
The following is the error that I have got when use #Resource
Caused by: org.springframework.beans.factory.BeanNotOfRequiredTypeException: Bean named 'myValue' must be of type [int], but was actually of type [java.lang.Integer]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:349)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.autowireResource(CommonAnnotationBeanPostProcessor.java:435)
at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.getResource(CommonAnnotationBeanPostProcessor.java:409)
at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor$ResourceElement.getResourceToInject(CommonAnnotationBeanPostProcessor.java:541)
at org.springframework.beans.factory.annotation.InjectionMetadata$InjectedElement.inject(InjectionMetadata.java:147)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:84)
at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessPropertyValues(CommonAnnotationBeanPostProcessor.java:297)
... 21 more
However, if I use #Autowired, the following error will be resulted
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private int tsttst.MyService.myInt; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [int] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {#org.springframework.beans.factory.annotation.Autowired(required=true), #org.springframework.beans.factory.annotation.Qualifier(value=myValue)}
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:507)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:84)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:283)
... 21 more
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [int] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {#org.springframework.beans.factory.annotation.Autowired(required=true), #org.springframework.beans.factory.annotation.Qualifier(value=myValue)}
at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:914)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:783)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:697)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:478)
... 23 more

Answer 1

How is the int defined?
If it is property (with a placeholder configurer for example) you can use #Value.
If it is defined with <bean id="myValue" class="java.lang.Integer">..</bean> with either constructor-arg or a factory-method, then #Autowired / #Resource should work.
As for autounboxing - it seems it does not work, so you'd need an Integer.
You can also try <util:constant .. />