Pluggable Class Resolvers

Camel provides pluggable class resolvers allowing third party platforms and containers to provide their own resolvers in case the default ones would not fit. For example we provide a WebSpherePackageScanClassResolver out of the box to integrate Camel with IBM WebSphere.

Platform providers should look in the org.apache.camel.spi package for the pluggable resolvers below:

  • PackageScanClassResolver

  • ClassResolver

  • FactoryFinderResolver

In camel-osgi we provide OSGi aware class resolver allowing Camel to run in any OSGi container.

Configuration of a custom class resolver

To instruct Camel to use your own custom class resolver, you set the resolver on the CamelContext using the appropriate setters.

Easy configuration of a custom class resolver in Spring XML

We have provided easy configuration in Spring XML as you just need to declare a spring bean with your custom resolver and Camel will pick it up automatically.

<bean id="jbossresolver" class="com.mycompany.jboss.JBossPackageScanClassResolver"/>

<camelContext id="camel" xmlns="http://camel.apache.org/schema/spring">
  <route>
    <from uri="seda:start"/>
    <to uri="mock:result"/>
  </route>
</camelContext>

In the sample above the CamelContext will automatic detect the jbossresolver bean and use it instead of its default one.

Configuration of a custom factory finder resolver

FactoryFinderResolver is used to get an instance of FactoryFinder that is used for lookup of resource files in the classpath in the META-INF/services. It is used internally by Camel to look in .jars for Camel components. For instance to look for the file component Camel will use the FactoryFinder to look the file named file in META-INF/services/org/apache/camel/component. The CamelContext have methods to inject a custom FactoryFinderResolver.

Easy configuration of a custom factory finder resolver in Spring XML

We have provided easy configuration in Spring XML as you just need to declare a spring bean with your custom factory finder resolver and Camel will pick it up automatically.

<bean id="jbossFactoryFinderResolver" class="com.mycompany.jboss.JBossFactoryFinderResolver"/>

<camelContext id="camel" xmlns="http://camel.apache.org/schema/spring">
  <route>
    <from uri="seda:start"/>
    <to uri="mock:result"/>
  </route>
</camelContext>
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