Spring 3.5 设置 xml 属性，使用 PropertyPlaceholderConfigurer 处理默认值

Question

I'm working with an old project using Spring 3.5 and xml config.

In the application context I am setting a property to an externally configured xml file value so something like this -

<bean id="myService" class="com.mypath.MyService">
    <property name="myProperty" value="${myValue}:myDefaultValue" />
</bean>

This all works properly.

In some tests though there is a test-context.xml coming into play which sets the values of the properties like this

<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="properties">
        <util:properties>
            <prop key="myProperty">myValue</prop>
        </util:properties>
    </property>
</bean>

This is failing to 'understand' the default value. If I leave the value blank I get :myDefaultValue returned. If I set myValue like my example shows I get myValue:myDefaultValue.

I had a quick peak at the PropertyPlaceholderConfigurer and it looks very basic without many options. I've not used it before. Does anyone know if there is a simple way for me to handle the defaults ? Or maybe I have to use a different method to set the test context values ?

Answer 1

You have your syntax slightly off. The default value for the expression goes inside the braces, like so: ${myValue:defaultValue} .