spring-integration is losing headers when sent to a subscriber - spring-integration

Question

I am using spring-integration with hornetQ. The problem is that I have put a custom header in the message (Method), but when it hits the subscriber the header is no longer available. I there some sort of configuration property I need to setup to preserve headers?
An application receives the message (I can see the Method header in the console log so I know it is actually getting the correct message). It basically just routes the message onto the outbound queue so that client can subscribe to it (if there is a cleaner way to do this please let me know)
<int:channel id="partsChannel" />
<int-jms:message-driven-channel-adapter
id="jmsPartsInbound"
acknowledge="transacted"
destination-name="parts.in"
channel="partsChannel"
connection-factory="jmsConnectionFactory"
/> <!-- error-channel="partsInboundFailedChannel" -->
<int-jms:outbound-channel-adapter
id="jmsPartsOutbound"
destination-name="parts.out"
channel="partsChannel"
connection-factory="jmsConnectionFactory"
pub-sub-domain="true"
>
<int-jms:request-handler-advice-chain>
<int:retry-advice max-attempts="3">
<int:exponential-back-off initial="2000" multiplier="2" />
</int:retry-advice>
</int-jms:request-handler-advice-chain>
</int-jms:outbound-channel-adapter>
Applications subscribe like so:
<int:channel id="partsInboundChannel" />
<int-jms:message-driven-channel-adapter
id="jmsPartsInbound"
acknowledge="transacted"
destination-name="parts.out"
channel="partsInboundChannel"
pub-sub-domain="true"
connection-factory="jmsConnectionFactory"/>
And this is the part that gets the message in the subscriber.
#ServiceActivator(inputChannel = "partsInboundChannel")
public void processPart(final Message message) {
...message.getHeaders does not contain the "Method" header
}

Answer 1

Isn't your issue here in the DefaultJmsHeaderMapper.fromHeaders:
if (value != null && SUPPORTED_PROPERTY_TYPES.contains(value.getClass())) {
try {
String propertyName = this.fromHeaderName(headerName);
jmsMessage.setObjectProperty(propertyName, value);
}
where SUPPORTED_PROPERTY_TYPESare:
private static List<Class<?>> SUPPORTED_PROPERTY_TYPES = Arrays.asList(new Class<?>[] {
Boolean.class, Byte.class, Double.class, Float.class, Integer.class, Long.class, Short.class, String.class });
So, if your method is really of Method type, it will be skipped.
Consider to use its name instead.