Creating a Spring enum bean and passing the value of a method call

Question

I have this Singleton:

   public enum Elvis {
       INSTANCE;
       private int age;

       public int getAge() {
           return age;
       }
   }

I know how to create the enum bean in spring:

   <bean id="elvis" class="com.xyz.Elvis" factory-method="valueOf">
           <constructor-arg>
               <value>INSTANCE</value>
           </constructor-arg>
   </bean> 

How do I pass the int returned by INSTANCE.getAge() into another beans constructor?

Answer 1

You can use Spring Expression Language:

<constructor-arg value = "#{elvis.age}" />

or without elvis bean:

<constructor-arg value = "#{T(com.xyz.Elvis).INSTANCE.age}" />