Simples Assim

import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.builder.xml.Namespaces;

public final class SampleRouteBuilder extends RouteBuilder {
  private static final Namespaces NS = new Namespaces("Sample", "http://fernandoribeiro.eti.br/Sample");

  @Override
  public void configure() throws Exception {
    from(...).process(new Processor() {

      public void process(final Exchange exchange) {
        final String str = (String) NS.xpath("/Sample:Element", String.class).evaluate(exchange);

        ...
      }

    });
  }

}

import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.component.http.HttpMethods;
import org.apache.camel.component.http.HttpProducer;

public final class SampleRouteBuilder extends RouteBuilder {

  @Override
  public void configure() throws Exception {
    from(...).setHeader(HttpMethods.HTTP_METHOD, HttpMethods.GET).setHeader(HttpProducer.HTTP_URI, "http://www.fernandoribeiro.eti.br").to("http://host");
  }

}

http://camel.apache.org/http.html

http://old.nabble.com/-DISCUSS–Faults-and-Exceptions-in-Camel-td24398169s22882.html

https://cwiki.apache.org/confluence/display/CAMEL/Composed+Message+Processor

No big issues with aggregation strategies to date.

https://issues.apache.org/activemq/browse/CAMEL-2819 (vote for it!)

http://cid-edc5a8d96d9a227c.office.live.com/self.aspx/Public/FUSE-MTOM-JosDirksen.pdf

http://camel.apache.org/list-of-type-conversions.html

Direct - Synchronous calls to routes in the same context and VM

SEDA - Asynchronous calls to routes in the same context and VM

VM - Asynchronous calls to routes in other contexts in the same VM

http://camel.apache.org/direct.html

http://camel.apache.org/seda.html

http://camel.apache.org/vm.html

Fixed in 4.2.

http://fusesource.com/issues/browse/ESB-658

http://fusesource.com/issues/browse/CAMELEDGE-5 (vote for it!)