Question

Simple internal constants, that should not be externalized to properties:

object InternalConstant {

  val CONSTANT_ONE: Byte = 21
  val CONSTANT_TWO: Byte = 42

}

Injecting them as I would with Java:

<bean id="daBean" class="my.package.DaClass">
    <constructor-arg>
        <util:constant static-field="my.package.InternalConstant.CONSTANT_TWO"/>
    </constructor-arg>
</bean>

getting a java.lang.NoSuchFieldException: CONSTANT_TWO

( the package path is correct )

Answer 1

That’s because behind the scenes InternalConstant is compiled into a class with static CONSTANT_ONE() method returning 21, not a field. And calling static methods is possible in Spring with SpEL:

<constructor-arg value="#{T(my.package.InternalConstant).CONSTANT_TWO()}"/>

Haven’t tested it though.