How does Spring 3 expression language interact with property placeholders?

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To access property placeholder from SpEL expression, the following syntax can be used: #{'${x.y.z}'}. Hovewer, it can’t solve your problem with elvis operator and default values, because it would throw an exception when ${x.y.z} cannot be resolved.

But you don’t need SpEL to declare default values for properties:

<context:property-placeholder location="..." properties-ref="defaultValues"/>

<bean id = "defaultValues" class = "org.springframework.beans.factory.config.PropertiesFactoryBean">
    <property name="properties">
        <props>
            <prop key="x.y.z">ZZZ</prop>
        </props>
    </property>
</bean>

<bean ...>
    <property name = "..." value = "${x.y.z}" />
</bean>

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