Spring Beans - how to wire null as a constructor arg?

You can use Spring's <null> tag:

<bean id="myBean" class="com.me.myapp.Widget">
    <constructor-arg name="fizz">
            <null />
    </constructor-arg>
    <constructor-arg name="buzz" ref="someOtherBean" />
</bean>

At times spring fails to inject the values in the ordered you have mentioned into a constructor. It's better if you try with explicit ordering, i.e.

<constructor-arg index="0" name="fizz"><null/></constructor-arg> 
<constructor-arg index="1" name="buzz"><ref bean="someOtherBean"/></constructor-arg>

Spring Beans - how to wire null as a constructor arg?

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