It seems your code can not find the class: Caused by: java.lang.ClassNotFoundException: org.apache.xerces.dom.ElementNSImpl
from ODF Toolkit
Note: ODFDOM requires Apache Xerces. The jar file xercesImpl.jar also must exist in a folder lib next to odfxsltrunner.jar file, or it must be in the classpath. The ODF XSLT Runner NetBeans projects includes a reference to xersesImpl.jar in the runtime classpath which has to be adapted after checking out the project.