expireMessagesPeriod for activemq broker

In our activemq.xml file, simplified a little bit:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:amq="http://activemq.apache.org/sch
ema/core" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.sprin
gframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd http://
activemq.apache.org/schema/core
http://activemq.apache.org/schema/core/activemq-core.xsd">
<bean
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
</bean>
<bean id="logQuery" class="org.fusesource.insight.log.log4j.Log4jLogQuery"
lazy-init="false" scope
="singleton" init-method="start" destroy-method="stop">
</bean>
<broker xmlns="http://activemq.apache.org/schema/core"
brokerName="testname" dataDirectory="${activemq.data}">
<managementContext>
<managementContext createConnector="false"/>
</managementContext>
<persistenceAdapter>
<kahaDB directory="${activemq.data}/kahadb"/>
</persistenceAdapter>
<systemUsage>
<systemUsage>
<memoryUsage>
<memoryUsage percentOfJvmHeap="70"/>
</memoryUsage>
<storeUsage>
<storeUsage limit="1 gb"/>
</storeUsage>
<tempUsage>
<tempUsage limit="500 mb"/>
</tempUsage>
</systemUsage>
</systemUsage>
<sslContext>
<sslContext keyStore="/etc/BROKER.jks" keyStorePassword="xxx"
trustStore="/etc/BROKERTRUST.jks" trustStorePassword="xxx"/>
</sslContext>
<transportConnectors>
<transportConnector name="ssl"
uri="ssl://hostname:61616?needClientAuth=true橪;maximumConnections=1000橪;wireFormat.maxFrameSize=104857600"/>
</transportConnectors>
<shutdownHooks>
<bean xmlns="http://www.springframework.org/schema/beans"
class="org.apache.activemq.hooks.SpringContextHook"/>
</shutdownHooks>
<plugins>
<jaasCertificateAuthenticationPlugin configuration="CertLogin"/>
<authorizationPlugin>
<map>
<authorizationMap>
<authorizationEntries>
<authorizationEntry topic="ActiveMQ.Advisory.;" read="*"
write="*" admin="*"/>
<authorizationEntry queue="events" reader="read"
admin="writer" write="writer"/>
</authorizationEntries>
</authorizationMap>
</map>
</authorizationPlugin>
</plugins>
<destinationPolicy>
<policyMap>
<policyEntries>
<policyEntry queue="events" expireMessagesPeriod="10000"/>
</policyEntries>
</policyMap>
</destinationPolicy>
</broker>
</beans>

At the bottom, we have this expireMessagesPeriod, which I assume should be
in milliseconds, I cannot find this properly stated anywhere.
But I am writing to this queue, and if no one receives the message within 10
seconds, I am expecting it to expire and be deleted from the broker. This
functionality does not seem to be working at all, even reducing the time to
1 has no effect. When the receiver program reconnects, it receives all the
messages that should have expired.

Is there something I am missing in the xml to enable this feature, or
something I could be doing in my sending client to cause this? I am using
ActiveMQ 5.9, both Java and C++ APIs. But in this scenario I am sending with
Java and receiving with C++.

Thanks