How to ignore missing Spring properties and not call setter method

Anyone knows a way to make PropertyPlaceholderConfigurer ignore missing properties and not call the setter method at all?
for example:

<bean id="webAppContext" class="org.eclipse.jetty.webapp.WebAppContext" scope="prototype">
<property name="maxFormContentSize" value="${maxFormContentSize}"/>

I can use a default value for the placeholder, but in some cases I want to let jetty use whatever it defaults to, so I will not supply the maxFormContentSize property and I would expect the container to not call the setter method. but it does call the setter method with the placeholder's literal value and ignoreUnresolvablePlaceholders does not help here.

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