When using Marshal or Unmarhsal there is a lot of warnings in eclipse error log

When I use Marshal in a route (using JAXB) I see a lot of warnings in the eclipse log like these

eclipse.buildId=M20110210-1200
java.version=1.6.0_24
java.vendor=Apple Inc.
BootLoader constants: OS=macosx, ARCH=x86_64, WS=cocoa, NL=en_US
Framework arguments: -product org.eclipse.epp.package.java.product -keyring /Users/davsclaus/.eclipse_keyring -showlocation
Command-line arguments: -os macosx -ws cocoa -arch x86_64 -product org.eclipse.epp.package.java.product -keyring /Users/davsclaus/.eclipse_keyring -showlocation

Warning
Wed Apr 27 15:32:47 CEST 2011
Failed to find field: dataFormatName on org.apache.camel.model.dataformat.FlatpackDataFormat