Splunk & Spring Integration

Today's headache is integrating the two!

Me, having limited Spring experience, embarked on a wild journey of bean definitions and namespace resolutions, it got really frustrating before enjoyable...

Referencing http://docs.spring.io/autorepo/docs/spring-integration-splunk/0.5.x-SNAPSHOT/reference/htmlsingle/, it seems easy. Add this and you're set, or are you?

<?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="http://www.springframework.org/schema/integration"
 xmlns:int-splunk="http://www.springframework.org/schema/integration/splunk"
 xsi:schemaLocation="http://www.springframework.org/schema/integration/splunk
  http://www.springframework.org/schema/integration/splunk/spring-integration-splunk.xsd
  http://www.springframework.org/schema/integration
  http://www.springframework.org/schema/integration/spring-integration.xsd
  http://www.springframework.org/schema/beans
  http://www.springframework.org/schema/beans/spring-beans.xsd">

</beans>

Well no, because going to http://www.springframework.org/schema/integration/splunk yields nothing. I'd wish Spring mentions that!

You must add this to your dependencies:
http://maven-repository.com/artifact/org.springframework.integration/spring-integration-splunk/1.1.0.RELEASE
Cool so for me, I'm using IntelliJ, and Ivy for my dependency management. Keep in mind IntelliJ Community Edition has no Spring support, thought I'd mention that because my Intellij was complaining about Spring being an "unknown facet". Also, I'm running my application on Jetty.

It should just work, but I continually got this:
Caused by: org.springframework.beans.FatalBeanException: Class [org.springframework.integration.splunk.config.xml.SplunkNamespaceHandler] for namespace [http://www.springframework.org/schema/integration/splunk] does not implement the [org.springframework.beans.factory.xml.NamespaceHandler] interface
What does this even mean? After lots of googling, I was led to believe I had a classloader issue. Do I add an entry to my web.xml, or my project classpath? Do I add my JAR to my WEB-INF/lib folder (worst suggestion ever)? But everything in my IntelliJ lib folder is already on the classpath!! Then I thought, hm maybe the error means something and it's because SplunkNamespaceHandler is extending AbstractIntegrationNamespaceHandler...

Nope, none of the above. The problem is the Splunk JAR (1.1.0) has a dependency on 4.0.2-RELEASE of Spring, whereas my Spring context.xml looked like the below:

<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:task="http://www.springframework.org/schema/task"
       xmlns:util="http://www.springframework.org/schema/util"
       xmlns:int-splunk="http://www.springframework.org/schema/integration/splunk"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
       http://www.springframework.org/schema/integration/splunk
       http://www.springframework.org/schema/integration/splunk/spring-integration-splunk.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context-3.1.xsd
       http://www.springframework.org/schema/task
       http://www.springframework.org/schema/task/spring-task-3.0.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd">

Changing all the Ivy dependencies to 4.0.2 and making sure IntelliJ's default Spring libraries aren't being used did the trick.

Also, my perfect girlfriend asked for a shoutout, so here it is! :)