Can`t create bean of FtpOutboundGateway

[jakub.kettner]

Hi,
I am using SI 2.2.0 now but I had the same problem with 2.1.0. I would like to use int-ftp:outbound-gateway but every time I define it I get the following exception.
So far I just want to define gateway (without use):

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:int-ftp="http://www.springframework.org/schema/integration/ftp"
	xmlns:int="http://www.springframework.org/schema/integration"
	xsi:schemaLocation="
	http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration.xsd 
	http://www.springframework.org/schema/integration/ftp http://www.springframework.org/schema/integration/ftp/spring-integration-ftp.xsd
	http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
	
	<bean id="ftpSessionFactory" class="org.springframework.integration.ftp.session.DefaultFtpSessionFactory">
		<property name="host" value="foo"/>
		<property name="port" value="123"/>
		<property name="username" value="foo"/>
		<property name="password" value="foo"/>
	</bean>

	<int:channel id="ftpTransChannel">
		<int:queue />
	</int:channel>

	<int-ftp:outbound-gateway 
		id="outGateway"
		command="ls"
		expression="/path/"
		session-factory="ftpSessionFactory"
		request-channel="ftpTransChannel"/>
</beans>

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.integration.ftp.gateway.FtpOutboundGateway#0': Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.springframework.integration.ftp.gateway.FtpOutboundGateway]: Constructor threw exception; nested exception is java.lang.NullPointerException

I had of course more complex functionality but once I got this exception I reduced it to this basic form but the exception is still there. Do you have any idea what can cause the problem?


---------------------------------
My second question is - can be int-ftp:outbound-gateway triggered simply via sending Message into ftpTransChannel (lets say in service-activator)?

Message<String> msg = MessageBuilder.withPayload("/").build();
ftpTransChannel.send(msg);

Thank you,
Jakub

[Gary Russell]

The SpEL expression is not well-formed (but it probably should not result in a NPE; I opened a ticket in Spring https://jira.springsource.org/browse/SPR-10146).

If you want to use a literal expression, surround it in single quotes

"'/path/'"

.

Yes, you can send a message to the gateway but you will need something to consume the result.

However, it is better to not expose your application to the messaging infrastructure - take a look at the ftp sample - it used a <gateway/>.

[jakub.kettner]

Thank you Gary.
Surrounding by single quotes helped to solve mentioned exception but next run thrown another exception:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'outGateway': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: No poller has been defined for endpoint 'outGateway', and no default poller is available within the context.

Which is relay strange in outbound-gateway (I would expect it in case of adapter but not gateway).
My actual version is SI 2.1.0. The code is still the same (I will add consumer later).

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:int-ftp="http://www.springframework.org/schema/integration/ftp"
	xmlns:int="http://www.springframework.org/schema/integration"
	xsi:schemaLocation="
	http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration.xsd 
	http://www.springframework.org/schema/integration/ftp http://www.springframework.org/schema/integration/ftp/spring-integration-ftp.xsd
	http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
	
	
	<bean id="ftpSessionFactory" class="org.springframework.integration.ftp.session.DefaultFtpSessionFactory">
		<property name="host" value="foo"/>
		<property name="port" value="123"/>
		<property name="username" value="foo"/>
		<property name="password" value="foo"/>
	</bean>

	<int:channel id="ftpTransChannel">
		<int:queue />
	</int:channel>

	<int-ftp:outbound-gateway 
		id="outGateway"
		command="ls"
		expression="'/path/'"
		session-factory="ftpSessionFactory"
		request-channel="ftpTransChannel"/>
</beans>

Thank you,
Jakub

[Gary Russell]

Right, because ftpTransChannel is a queue channel, message senders simply drop the message into the queue; we need a thread (poller) to poll the queue and send it to the gateway.

You can either add a <poller/> element to the gateway, or simply remove the <queue/> element from the channel and the gateway will be invoked on the calling thread.

[jakub.kettner]

Oh beginner error! It helped -Thank you Garry.

regards,
Jakub