anchor.diff:  send the Exchange when the `maximumRedeliveries` was
   hit.
   
  -You can see some examples in the unit tests of camel-hawtdb, for example
  -https://svn.apache.org/repos/asf/camel/trunk/components/camel-hawtdb/src/test/java/org/apache/camel/component/hawtdb/HawtDBAggregateRecoverTest.java[this
  -test].
  -
  -[[HawtDB-UsingHawtDBAggregationRepositoryinJavaDSL]]
  -Using HawtDBAggregationRepository in Java DSL
  -+++++++++++++++++++++++++++++++++++++++++++++
  -
  -In this example we want to persist aggregated messages in the
  -`target/data/hawtdb.dat` file.
  -
  -[[HawtDB-UsingHawtDBAggregationRepositoryinSpringXML]]
  -Using HawtDBAggregationRepository in Spring XML
  -+++++++++++++++++++++++++++++++++++++++++++++++
  -
  -The same example but using Spring XML instead:
  -
  -[[HawtDB-Dependencies]]
  -Dependencies
  -^^^^^^^^^^^^
  -
  -To use HawtDB in your camel routes you need to add the
  -a dependency on *camel-hawtdb*.
  -
  -If you use maven you could just add the following to your pom.xml,
  -substituting the version number for the latest & greatest release (see
  -the download page for the latest versions).
  -
  -[source,xml]
  ----------------------------------------
  -<dependency>
  -  <groupId>org.apache.camel</groupId>
  -  <artifactId>camel-hawtdb</artifactId>
  -  <version>2.3.0</version>
  -</dependency>
  ----------------------------------------
  -
  -[[HawtDB-SeeAlso]]
  -See Also
  -^^^^^^^^
  -
  -* Configuring Camel
  -* Component
  -* Endpoint
  -* Getting Started
  -
  -* Aggregator
  -* Components
  -
  +You can see some examples in the unit tests of camel-hawtdb
positive.code: `Message` headers. The `Exchange` properties are *not* persisted.
  
  [[HawtDB-Recovery]]
  Recovery
  ^^^^^^^^
  
  The `HawtDBAggregationRepository` will by default recover any failed
  Exchange. It does this by having a background tasks
  
negative.code: [[HawtDB-HawtDB]]
  == HawtDB (deprecated)
  
  *Available as of Camel 2.3*
  
  