Previously initiated loading for a different type with name org/apache/struts/upload/FormFile

Pessoal,
Estou tendo esse erro quando tendo entrar na página pela segunda vez. Alguém sabe o pq?
14:12:24,153 ERROR [ContainerBase] Servlet.service() for servlet upload threw exception

java.lang.LinkageError: loader constraint violation: loader (instance of org/jboss/mx/loading/UnifiedClassLoader3) previously initiated loading for a different type with name “org/apache/struts/upload/FormFile”

at java.lang.Class.getDeclaredMethods0(Native Method)

at java.lang.Class.privateGetDeclaredMethods(Class.java:2427)

at java.lang.Class.getDeclaredMethods(Class.java:1791)

at java.beans.Introspector$1.run(Introspector.java:1287)

at java.security.AccessController.doPrivileged(Native Method)

at java.beans.Introspector.getPublicDeclaredMethods(Introspector.java:1285)

at java.beans.Introspector.getTargetMethodInfo(Introspector.java:1151)

at java.beans.Introspector.getBeanInfo(Introspector.java:402)

at java.beans.Introspector.getBeanInfo(Introspector.java:168)

at org.apache.commons.beanutils.PropertyUtilsBean.getPropertyDescriptors(PropertyUtilsBean.java:896)

at org.apache.commons.beanutils.PropertyUtilsBean.getPropertyDescriptors(PropertyUtilsBean.java:926)

at org.apache.commons.beanutils.PropertyUtilsBean.getPropertyDescriptor(PropertyUtilsBean.java:801)

at org.apache.commons.beanutils.PropertyUtilsBean.getSimpleProperty(PropertyUtilsBean.java:1119)

at org.apache.commons.beanutils.PropertyUtilsBean.getNestedProperty(PropertyUtilsBean.java:686)

at org.apache.commons.beanutils.PropertyUtilsBean.getProperty(PropertyUtilsBean.java:715)

at org.apache.commons.beanutils.PropertyUtils.getProperty(PropertyUtils.java:290)

at org.apache.struts.taglib.TagUtils.lookup(TagUtils.java:950)

at org.apache.struts.taglib.html.BaseFieldTag.prepareValue(BaseFieldTag.java:121)

at org.apache.struts.taglib.html.BaseFieldTag.renderInputElement(BaseFieldTag.java:102)

at org.apache.struts.taglib.html.BaseFieldTag.doStartTag(BaseFieldTag.java:81)

at org.apache.jsp.jsp.importacao.roteiro.index_jsp._jspx_meth_html_005ffile_005f0(index_jsp.java:2361)

at org.apache.jsp.jsp.importacao.roteiro.index_jsp._jspx_meth_html_005fform_005f0(index_jsp.java:2311)

at org.apache.jsp.jsp.importacao.roteiro.index_jsp._jspService(index_jsp.java:627)

at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:387)

at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)

at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:687)

at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:469)

at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:403)

at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)

at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1062)

at org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:386)

at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:229)

at br.com.abril.acl.presentation.action.ACLRequestProcessor.process(ACLRequestProcessor.java:107)

at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)

at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:173)

at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:182)

at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)

at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241)

at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:853)

at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579)

at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1513)

at java.lang.Thread.run(Thread.java:619)
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