Xstream, problemas para manipular XML

Bom dia galera,

Tô em dúvida sobre um problema na minha aplicação, bom e o seguinte:
Tenho uma aplicação utilizando tecnologia EJB, dentro de tal, é chamado um método que realiza uma manipulação de XML com xstream,
mas quando isso acontece tenho o seguinte erro: javax.ejb.EJBException … Caused by: com.thoughtworks.xstream.XStream$InitializationException …

Stacktrace:

WARNING:   EJB5184:A system exception occurred during an invocation on EJB LaudoEJB, method: public void br.ufmg.hc.telessaude.diagnostico.servidor.services.LaudoEJB.salvar(br.ufmg.hc.telessaude.diagnostico.dominio.entity.Laudo) throws br.ufmg.hc.telessaude.diagnostico.dominio.exceptions.ServicesException,br.ufmg.hc.telessaude.diagnostico.dominio.exceptions.PlantaoEncerradoException,br.ufmg.hc.telessaude.diagnostico.dominio.exceptions.ExameLiberadoException
WARNING:   javax.ejb.EJBException
	at com.sun.ejb.containers.EJBContainerTransactionManager.processSystemException(EJBContainerTransactionManager.java:748)
	at com.sun.ejb.containers.EJBContainerTransactionManager.completeNewTx(EJBContainerTransactionManager.java:698)
	at com.sun.ejb.containers.EJBContainerTransactionManager.postInvokeTx(EJBContainerTransactionManager.java:503)
	at com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:4475)
	at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:2009)
	at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1979)
	at com.sun.ejb.containers.EJBObjectInvocationHandler.invoke(EJBObjectInvocationHandler.java:212)
	at com.sun.ejb.containers.EJBObjectInvocationHandlerDelegate.invoke(EJBObjectInvocationHandlerDelegate.java:79)
	at com.sun.proxy.$Proxy318.salvar(Unknown Source)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:601)
	at com.sun.corba.ee.impl.presentation.rmi.ReflectiveTie.dispatchToMethod(ReflectiveTie.java:143)
	at com.sun.corba.ee.impl.presentation.rmi.ReflectiveTie._invoke(ReflectiveTie.java:173)
	at com.sun.corba.ee.impl.protocol.ServerRequestDispatcherImpl.dispatchToServant(ServerRequestDispatcherImpl.java:528)
	at com.sun.corba.ee.impl.protocol.ServerRequestDispatcherImpl.dispatch(ServerRequestDispatcherImpl.java:199)
	at com.sun.corba.ee.impl.protocol.MessageMediatorImpl.handleRequestRequest(MessageMediatorImpl.java:1549)
	at com.sun.corba.ee.impl.protocol.MessageMediatorImpl.handleRequest(MessageMediatorImpl.java:1425)
	at com.sun.corba.ee.impl.protocol.MessageMediatorImpl.handleInput(MessageMediatorImpl.java:930)
	at com.sun.corba.ee.impl.protocol.giopmsgheaders.RequestMessage_1_2.callback(RequestMessage_1_2.java:213)
	at com.sun.corba.ee.impl.protocol.MessageMediatorImpl.handleRequest(MessageMediatorImpl.java:694)
	at com.sun.corba.ee.impl.protocol.MessageMediatorImpl.dispatch(MessageMediatorImpl.java:496)
	at com.sun.corba.ee.impl.protocol.MessageMediatorImpl.doWork(MessageMediatorImpl.java:2222)
	at com.sun.corba.ee.impl.threadpool.ThreadPoolImpl$WorkerThread.performWork(ThreadPoolImpl.java:497)
	at com.sun.corba.ee.impl.threadpool.ThreadPoolImpl$WorkerThread.run(ThreadPoolImpl.java:540)
Caused by: com.thoughtworks.xstream.XStream$InitializationException: Could not instatiate mapper : com.thoughtworks.xstream.mapper.CGLIBMapper : com.thoughtworks.xstream.mapper.CGLIBMapper.<init>(com.thoughtworks.xstream.mapper.Mapper)
	at com.thoughtworks.xstream.XStream.buildMapperDynamically(XStream.java:412)
	at com.thoughtworks.xstream.XStream.buildMapper(XStream.java:387)
	at com.thoughtworks.xstream.XStream.<init>(XStream.java:365)
	at com.thoughtworks.xstream.XStream.<init>(XStream.java:316)
	at br.ufmg.hc.telessaude.telediagnostico.xmlfactory.gerador.XMLFactory.gerarXML(XMLFactory.java:47)
	at br.ufmg.hc.telessaude.diagnostico.servidor.dao.LaudoDAO.gerarConteudo(LaudoDAO.java:150)
	at br.ufmg.hc.telessaude.diagnostico.servidor.dao.LaudoDAO.salvar(LaudoDAO.java:50)
	at br.ufmg.hc.telessaude.diagnostico.servidor.services.LaudoEJB.salvar(LaudoEJB.java:116)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:601)
	at org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1081)
	at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1153)
	at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:4695)
	at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:630)
	at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
	at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:582)
	at org.jboss.weld.ejb.AbstractEJBRequestScopeActivationInterceptor.aroundInvoke(AbstractEJBRequestScopeActivationInterceptor.java:55)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:601)
	at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)
	at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
	at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:582)
	at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doCall(SystemInterceptorProxy.java:163)
	at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke(SystemInterceptorProxy.java:140)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:601)
	at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)
	at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
	at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:369)
	at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:4667)
	at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:4655)
	at com.sun.ejb.containers.EJBObjectInvocationHandler.invoke(EJBObjectInvocationHandler.java:205)
	... 19 more
Caused by: java.lang.NoSuchMethodException: com.thoughtworks.xstream.mapper.CGLIBMapper.<init>(com.thoughtworks.xstream.mapper.Mapper)
	at java.lang.Class.getConstructor0(Class.java:2730)
	at java.lang.Class.getConstructor(Class.java:1676)
	at com.thoughtworks.xstream.XStream.buildMapperDynamically(XStream.java:409)
	... 56 more

Tenho urgência para esse projeto, se tiverem ideias para solucionar, ou outros caminhos, agradeceria muito.

Abraços.