When (un)marshalling objects using JAXB make sure to use the (un)marshall object only in one thread. See the following URL for more info about the stack trace.

http://acroyear.blog-city.com/xerces_and_the_dreaded_fwk005.htm

edu.uiuc.ncsa.cyberintegrator.FailedException: Exception during execution.
at edu.uiuc.ncsa.cyberintegrator.ExecuteStep.execute(ExecuteStep.java:115)
at edu.uiuc.ncsa.cyberintegrator.ThreadedEngine$WorkerThread.run(ThreadedEngine.java:572)
Caused by: javax.xml.bind.UnmarshalException

• with linked exception:
  [org.xml.sax.SAXException: FWK005 parse may not be called while parsing.]
  at javax.xml.bind.helpers.AbstractUnmarshallerImpl.createUnmarshalException(Unknown Source)
  at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.createUnmarshalException(Unknown Source)
  at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(Unknown Source)
  at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(Unknown Source)
  at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(Unknown Source)
  at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(Unknown Source)
  at edu.uiuc.ncsa.cyberintegrator.executor.external.ExternalTool.setup(ExternalTool.java:138)
  at edu.uiuc.ncsa.cyberintegrator.ExecuteStep.execute(ExecuteStep.java:85)
  ... 1 more
  Caused by: org.xml.sax.SAXException: FWK005 parse may not be called while parsing.
  at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
  at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
  ... 7 more