Camel 2.4.0 release

New and Noteworthy

Welcome to the 2.4.0 release which approx 182 issues resolved (new features, improvements and bug fixes such as...)

• Spring 3.0.3 is now the default Spring version used by Camel.
• Fully non blocking Asynchronous Routing Engine which all EIPs and some Camel Components supported.
• New feature to use scheduled delayed redelivery attempts (they are fully asynchronous and non blocking). You need to enable this using the option asyncDelayedRedelivery.
• Fixed a potential dead-lock when using Aggregator with timeout completion set.
• The camel-spring module now supports OSGi out of box, which renders camel-osgi as @deprecated.
• OSGi blueprint is now supported
• Added new <contextScan> to scan the Registry for RouteBuilder instances, just as scanning the classpath etc.
• Manually started routes is now also Graceful Shutdown by Camel
• Fixed issue using RouteContextRef with multiple CamelContext from the same Spring ApplicationContext.
• Bindy now supports Fixed-Length format message with padding, alignment (Left or Right)
• Improved and fixes some issues with the FTP component.
• Improved and fixed some issues using MultiPartForm with Jetty.
• Add ability to configure Bindy to remove whitespace when binding Numeric positions
• Added option useOriginalBody to OnCompletion
• Fixed issue when using mockito for testing when it uses CGLib proxies
• Fixed issue with @Consume not running in an unit of work to ensure callbacks is invoked when its done
• Routing Slip now uses Expression to define the slip. This is similar to the Recipient List pattern
• The security context can be passed from CXF to other camel Components.
• ManagementAgent settings can now be set using setters from Java, instead of having to use JVM system properties. See tip in Camel JMX wiki page.
• Resequencer in batch mode has two new options allowDuplicates and reverse which allows you to use it for re-ordering messages from JMS queues based on JMSPriority
• Tighten up the ProducerTemplate API a bit, see more details in the section Important changes to consider when upgrading.
• HTTP now better supports sending binary files.
• Fixed problem with using Quartz in OSGi and having Camel applications being hot-deployed which potentially could cause Quartz to stop scheduling in applications which haven't been stopped.
• Fixed issue with pausing and resuming jobs when running Quartz in clustered mode
• Added options on Quartz component to specify location of custom quartz.properties file to load from classpath.
• Upgraded to latest Quartz release 1.8.3.
• Introduced StartupListener to allow components/endpoints/producers/consumers etc. as a listener to be notified when CamelContext have just been started. This allows any custom logic to be executed as a late starter. This ensures Quartz scheduler is only started when all the routes and so forth is started and running.
• Fixed issue with FTP configuring starting directory from uri not accepting an absolute path. In the endpoint uri just define two leading / to indicate absolute, eg "ftp:admin:secret@someserver//absolutepath/foo/bar".
• Added fromRoute to NotifyBuilder.
• Improved the CSV component.
• Fixed issue with Direct endpoint having no consumers if endpoint have been evicted from CamelContext internal LRUCache.
• The RouteBuilder now have simple and xpath expression builder methods out of the box.
• Upgraded to latest release of Scala 2.8.0RC7 in Scala DSL
• camel-hawtdb updated to HawtDB 1.1 picks up several bug fixes that improves stability and performance.
• Fixed issue with splitting files using tokenizer not being able to delete/move file after processing is done on Windows platform.
• maxMessagesPerPoll is now applied eagerly to limit intaking files earlier for the File and FTP components, Thus avoid excessive memory consumption if you poll directories which contains 100.000+ files.
• Added connectTimeout, soTimeout and timeout to FTP so its easier to configure timeouts.
• Consolidated support for per platform disabling of tests across the entire test suite.
• Introduced ProcessorFactory to be able to use a custom factory to be able to manipulate Processor creation process. For example to add additional outputs or manipulate the route model.
• camel-jms now supports Oracle AQ
• Added a Debugger API to be leveraged by 3rd party tooling.
• The beanRef and methodCall DSLs will eager check on startup, the bean reference exists in Registry and the provided method name is a valid method name on the bean as well. This helps to fail fast if end users have a typo in their routes.
• JMX now exposes notifications which listeners can receive.
• Added ExchangeRedeliveryEvent event being emitted when Camel Error Handler attempts a redelivery.
• Properties component can lookup java.util.Properties from the Registry using the ref: prefix.
• Spring Security is upgrade to spring security 3.0.3.RELEASE.

New Enterprise Integration Patterns

New Components

• EJB to access EJB beans in a similar way as with the Bean component
• Class to invoke beans defined using the fully qualified class name
• OSGi Blueprint to use Camel with OSGi blueprint

New DSL

New Annotations

• @RoutingSlip

New Data Formats

New Languages

New Examples

New Tutorials

API breaking

The ToAsync has been removed and replaced with a better asynchronous routing engine.

Routing Slip now requires using Expression to specify the routing slip header, the XML DSL of Routing Slip is broken.

    <route>
       <from uri="direct:a"/>
       <!--NOTE from Camel 2.4.0, you need to specify the expression element inside of the routingSlip element -->
       <routingSlip ignoreInvalidEndpoints="true">
           <header>myHeader</header>
       </routingSlip>
    </route>

The retryUntil method on onException have been renamed to retryWhile to better match what it does. It keeps retrying while the predicate returns true.

org.apache.camel.spi.Policy now has an additional method beforeWrap which means you need to implement this method in your implementations. Just add a empty method to adapt.

The class org.apache.camel.management.event.ExchangeFailureEvent has been renamed to org.apache.camel.management.event.ExchangeFailedEvent.

Known Issues

The Tracer may not output all details for some situations such as when using onCompletion or intercept etc.

Not all Examples have ANT build.xml files to run the example using ANT.

The read timeout in Netty is causing it to spawn threads and you end up with out of memory error. You have to disable using timeout by setting the timeout=0 in the endpoint configuration. This issue has been fixed in the next release.

The LoggingErrorHandler does not work when also using onException. It may go into an endless loop. So refrain from using logging error handler.

The JMX statistics for type=processors is being counted double. The stats on the type=routes is correct though.

The Jetty component sends back HTTP headers with lower-case keys.

HawtDB does not work in OSGi

HawtDB has a bug in version 1.4 or older which prevents the filestore to free unused space. Version 1.5 fixes this.

There is a concurrency issue when using predicates using binary operators such as isEqualTo. See CAMEL-3188.

The FTP consumer may stop continue polling. You can start the consumer from eg. a management console and it will start again.

Important changes to consider when upgrading

Camel now uses Spring 3.0.3 as the default Spring version. Spring 2.5 is still supported.
Spring 2.0.x support is now @deprecated and will in future releases not be supported.

IntrospectionSupport has been improved to be consistent for getProperty and getProperties. Also getProperties now find all relevant properties. This will often only be relevant for Camel end users who build their own components any may use IntrospectionSupport.

The ProducerTemplate have been tighten up a bit. All send/request -body methods will now throw a CamelExecutionException with the cause wrapped. This ensures its consistent.

The ftps is now using secure data channel also when transferring files. There has been added some options which you can use to control the behavior and turn it off if you want the old behavior (only secure login).

The FTP starting directory can now be set using absolute paths as well. In the endpoint uri just define two leading / to indicate absolute, eg "ftp:admin:secret@someserver//absolutepath/foo/bar".

The default port from ftps has been changed from 2222 to 21.

The FTP is now using a default of 10 sec connect timeout (ALL), and 30 sec data timeout (FTP/FTPS only).

The RouteBuilder now have simple and xpath expression builder methods out of the box, which means you don't have to use static imports to use those two Languages. The compiler may complain if you have a static import, which you simply fix by removing the static import.

Getting the Distributions

Binary Distributions

Source Distributions

Getting the Binaries using Maven 2

To use this release in your maven project, the proper dependency configuration that you should use in your Maven POM is:

<dependency>
  <groupId>org.apache.camel</groupId>
  <artifactId>camel-core</artifactId>
  <version>2.4.0</version>
</dependency>

SVN Tag Checkout

svn co http://svn.apache.org/repos/asf/camel/tags/camel-2.4.0

Changelog

For a more detailed view of new features and bug fixes, see:

• JIRA Release notes for 2.4.0