Can`t create bean of FtpOutboundGateway

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):

Code:

---

<?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>

---

Code:

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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)?

Code:

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

---

Thank you,
Jakub

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

Code:

---

"'/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/>.

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

Code:

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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).

Code:

---

<?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

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.

Oh beginner error! It helped -Thank you Garry.

regards,
Jakub