public class NumberAndTimeUnitBean {
    public void setNumber(int number) {}
    public void setTimeUnit(TimeUnit timeUnit) {}
}

<bean class="foo.bar.NumberAndTimeUnitBean">                                       
  <property name="number">                                                    
    <util:constant static-field="java.util.concurrent.TimeUnit.MILLISECONDS"/>
  </property>                                                                 
  <property name="timeUnit">                                                  
    <util:constant static-field="javax.jms.Session.DUPS_OK_ACKNOWLEDGE"/>     
  </property>                                                                 
</bean>

Note that retrieved static fields are not compatible with used properties.

Attached patch adds a resolver for <util:constant>.
Since Spring is reflection-based, primitives are treated as wrapped values.

Issue was resolved