Sending amqp message to ibm mq - spring-integration

Question

Trying to transfer messages form RabbitMQ <int-amqp:inbound-channel-adapter to MQSeries <int-jms:outbound-channel-adapter. This works fine.
Actually some producers on MQSeries use IBM JMS classes like that :
MQMessage messageMQ = new MQMessage();
messageMQ.format = " ";
messageMQ.persistence = 1;
messageMQ.correlationId = MQ_MESSAGE_CORRELATION_ID;
messageMQ.write(message.getMessageData());
MQPutMessageOptions putMessageOption = new MQPutMessageOptions();
putMessageOption.options = 8194;
MQQueue queue = openQueue(destinataire, 8208);
queue.put(messageMQ, putMessageOption);
I tried using transformer between amqp and jms like this :
<int:transformer id="testTransformer" ref="testTransformerBean" input-channel="fromRabbit"
method="transform" output-channel="toJms"/>
public MQMessage transform(Message<?> msg) throws Exception {
MQMessage result = new MQMessage();
result.format = " ";
result.persistence = 1;
result.correlationId = MQC.MQCI_NONE;
String test = "message to send ";
result.write(test.getBytes());
return result;
}
What is the type of Object storing in msg.getPayload()? How can i convert it into a String object?
Implementing this method, i have an exception because the outbound need a JMS message and not a com.ibm.mq.MQMessage!
Cannot convert object of type [com.ibm.mq.MQMessage] to JMS message
Is this way correct?
Or should i remove the outbound-channel and use a service activator instead with specific code for IBM?
Thanks for your help
Regards
Edit following Artem's answer
Following the jms outbound configuration:
<bean id="jmsConnectionFactory" class="com.ibm.mq.jms.MQConnectionFactory">
<property name="queueManager" value="${queueManager}" />
<property name="hostName" value="${hostName}" />
<property name="port" value="${port}" />
<property name="channel" value="${channelName}" />
<property name="transportType" value="1" />
</bean>
<bean id="jmsQueue" class="com.ibm.mq.jms.MQQueue" depends-on="jmsConnectionFactory">
<property name="baseQueueManagerName" value="${queueManager}" />
<property name="baseQueueName" value="${queueName}" />
<property name="targetClient" value="1" />
</bean>
<bean id="jmsConnectionFactory_cred"
class="org.springframework.jms.connection.UserCredentialsConnectionFactoryAdapter">
<property name="targetConnectionFactory" ref="jmsConnectionFactory" />
<property name="username" value="${user}"/>
<property name="password" value="${password}"/>
</bean>
<bean id="connectionFactoryCaching"
class="org.springframework.jms.connection.CachingConnectionFactory">
<property name="targetConnectionFactory" ref="jmsConnectionFactory_cred" />
<property name="sessionCacheSize" value="${BRIDGE_MQ_OUTBOUND_SESSION_CACHE}" />
</bean>
<bean class="org.springframework.integration.handler.advice.ExpressionEvaluatingRequestHandlerAdvice" id="requestHandler">
<property name="trapException" value="false"/>
<property name="onFailureExpressionString" value="#this"/>
<property name="failureChannel" ref="processChannel1"/>
</bean>
<int-jms:outbound-channel-adapter channel="channelRmqMQ"
id="jmsOut" destination="jmsQueue" connection-factory="connectionFactoryCaching" delivery-persistent="true"
explicit-qos-enabled="true" session-transacted="true" >
<int-jms:request-handler-advice-chain>
<ref bean="requestHandler" />
</int-jms:request-handler-advice-chain>
</int-jms:outbound-channel-adapter>

Answer 1

If your AMQP message comes with the text/* contentType, then its body is converted to string automatically by the out-of-the-box SimpleMessageConverter in the AmqpInboundChannelAdapter:
if (contentType != null && contentType.startsWith("text")) {
String encoding = properties.getContentEncoding();
if (encoding == null) {
encoding = this.defaultCharset;
}
try {
content = new String(message.getBody(), encoding);
} catch (UnsupportedEncodingException var8) {
throw new MessageConversionException("failed to convert text-based Message content", var8);
}
Otherwise you need to place a simple transformer in between to convert a byte[] to string:
<object-to-string-transformer>
The <int-jms:outbound-channel-adapter> is exactly for JMS protocol interaction, so, your MQMessage is not going to be accepted there. That's why you get that Cannot convert object of type [com.ibm.mq.MQMessage] to JMS message exception.
Yes, you can use IBM MP API directly in some custom service-activator, however I would suggest to take a look into JMS to MQ bridge on IBM WebSphere. Then you need only to configure an appropriate connection factory and use it from the <int-jms:outbound-channel-adapter>:
<jee:jndi-lookup id="jndiMqConnectionFactory" jndi-name="${mqConnectionFactory}"/>
<bean id="jmsQueueConnectionFactory"
class="org.springframework.jms.connection.UserCredentialsConnectionFactoryAdapter">
<property name="targetConnectionFactory" ref="jndiMqConnectionFactory"/>
<property name="username" value="${mqLogin}"/>
<property name="password" value="${mqPassword}"/>
</bean>
<jee:jndi-lookup id="myMqQueue" jndi-name="queue/myMqQueue"/>
<bean id="mqQueueJmsTemplate" class="org.springframework.jms.core.JmsTemplate">
<property name="connectionFactory" ref="jmsQueueConnectionFactory"/>
<property name="defaultDestination" ref="myMqQueue"/>
</bean>
<jms:outbound-channel-adapter channel="myMqChannel" jms-template="mqQueueJmsTemplate"/>