Spring Integration w/ DM Server where "new ClassPathXmlApplicationContext()" not work

[jazzmann]

Hi,

our standalone application uses Spring Integration.
It listens to a directory in interval.
New files are read and a bean will create some entities in a database rest upon the content of these files.

There is a main application, where the system is started.

package org.foo.solarintegration.main;

import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class App {
    static AbstractApplicationContext context;

    public static void main(String[] args) {
        context = new ClassPathXmlApplicationContext("beans.xml");
    }

    public static AbstractApplicationContext getContext() {
        return context;
    }
}

Now with OSGI, in the Spring DM Server, the Web bundle should start the work in the Integration bundle.
First try was: the web bundle calls a method in the integration bundle, wich creates the new context like in the upper code.

But this won't work.
I need something like the following.
The web bundle uses a gateway to the integration bundle.
Via this gateway the integration work should be started.
Here is a good example how to use Spring Integration in OSGI with gateways:
http://blog.springsource.com/2009/07...just-add-osgi/
The inbound uses a gateway to the outbound wich offers a file:outbound-gateway to write files containing messages send by the inbound.

Here is the XML configuration file in the META-INF/spring folder which is similar to the configuration in the Spring Integration standalone application:

<?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:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:integration="http://www.springframework.org/schema/integration" xmlns:file="http://www.springframework.org/schema/integration/file"
    xmlns:osgi="http://www.springframework.org/schema/osgi"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
        http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration-1.0.xsd
        http://www.springframework.org/schema/integration/file http://www.springframework.org/schema/integration/file/spring-integration-file-1.0.xsd
        http://www.springframework.org/schema/osgi http://www.springframework.org/schema/osgi/spring-osgi.xsd">

    <!-- 
        SPRING INTEGRATION 
    -->
    <!-- process property placeholders using a property file -->
    <context:property-placeholder location="META-INF/spring/net-env.properties" />

    <file:inbound-channel-adapter directory="file:${incoming.directory}" auto-startup="true"
        filename-pattern="${incoming.pattern}" id="incoming" channel="files" />

    <integration:channel id="files" datatype="java.io.File">
        <integration:queue capacity="10" />
    </integration:channel>

    <!-- Gateway which creates new jobs in the database -->
    <bean id="registerJob" class="org.foo.integration.RegisterSample" />

    <!-- Call the specified bean with message payloads of the input channel -->
    <integration:service-activator input-channel="files" ref="registerJob" method="register" />

    <!-- -->
    <integration:poller id="poller" default="true" max-messages-per-poll="3">
        <integration:interval-trigger interval="2000" />
    </integration:poller>
    
    
    <!--  -->
    <osgi:reference id="hibernateSampleDAOImpl" interface="org.foo.SampleDAO" />
</beans>

Is the application context created automativally by DM Server?
This code snippet --auto-startup="true"-- has no effect.

So, how to solve this? :)

King regards
Alex

[oleg.zhurakousky]

Alex

I would suggest to read up Spring-DM documentation especially the chapter about ApplicationContext creation: http://static.springsource.org/osgi/...e/#bnd-app-ctx
OSGi introduces a radically different programming, class-loading and deployment model (remember no more class-path in a normal sense), which means a lot of things needs to be done differently to accommodate this model, that is why we have Spring-DM as a foundation block for dmServer. It uses its own custom implementation of ApplicationContext interface (OsgiBundleXmlApplicationContext). However, before you venture into creating your own Application Context:

• Yes, ApplicationContext is created automatically by Spring-DM Extender bundle.
• Bundles communicate with one another via OSGi services (as in the example you were mentioning in your post), to accommodate OSGi Service dynamics

So, all you need is two bundles: web and integration.
Integration bundle would export its Gateway as an OSGi service (<osgi:service/>). Such Gateway service would be imported by the web bundle (<osgi:reference/>).
Again, the example from our blogs that you were referring to clearly shows how to accomplish that as it demonstrates two integration bundles communication with one another via OSGi services.

[jazzmann]

Thanks for Your fast reply.
I will read the documentation again and will try your proposal.

Alex