ZFS webconsole show (no devices)

ZFS from command line works perfectly. I can work with all my configured pools and file systems. But when I run the webconcole and go to zfs application it shows me
System Summary/Tasks      
     Storage Pools (0)
     File Systems (0)
     Volumes (0)
     Snapshots (0)
Device Hierarchy
     (no devices)
Can somebody help me?

Some additional information.
I found in log the following exception:
javax.xml.transform.TransformerException: Unknown error in XPath.
     at com.sun.org.apache.xpath.internal.XPath.execute(XPath.java:296)
     at com.sun.org.apache.xpath.internal.jaxp.XPathImpl.eval(XPathImpl.java:213)
     at com.sun.org.apache.xpath.internal.jaxp.XPathImpl.evaluate(XPathImpl.java:275)
     at com.sun.zfs.common.model.XMLDataModel.getAvailableDisks(XMLDataModel.java:466)
     at com.sun.zfs.common.model.LockhartDataModel.getAvailableDisks(LockhartDataModel.java:34)
     at com.sun.zfs.web.admin.zfsmodule.model.AvailableDevicesTableModel.<init>(AvailableDevicesTableModel.java:34)
     at com.sun.zfs.web.admin.zfsmodule.model.AvailableDevicesTableModel.<init>(AvailableDevicesTableModel.java:60)
     at com.sun.zfs.web.admin.zfsmodule.view.AvailableDevicesTableViewHelper.createTableModel(AvailableDevicesTableViewHelper.java:111)
     at com.sun.zfs.web.admin.zfsmodule.view.TableViewHelper.createChild(TableViewHelper.java:62)
     at com.sun.zfs.web.admin.zfsmodule.view.AvailableDevicesTableViewHelper.createChild(AvailableDevicesTableViewHelper.java:86)
     at com.sun.zfs.web.admin.zfsmodule.wizard.common.WizardPageView.createChild(WizardPageView.java:159)
     at com.sun.zfs.web.admin.zfsmodule.wizard.appendpool.AppendPoolDevicesPageView.createChild(AppendPoolDevicesPageView.java:83)
     at com.iplanet.jato.view.ContainerViewBase.ensureChild(ContainerViewBase.java:187)
     at com.iplanet.jato.view.ContainerViewBase.getChild(ContainerViewBase.java:541)
     at com.iplanet.jato.view.ContainerViewBase.beginChildDisplay(ContainerViewBase.java:819)
     at com.iplanet.jato.taglib.TagBase.fireBeginDisplayEvent(TagBase.java:133)
     at com.sun.web.ui.taglib.common.CCTagBase.fireBeginDisplayEvent(CCTagBase.java:149)
     at com.sun.web.ui.taglib.common.CCTagBase.doEndTag(CCTagBase.java:108)
     at org.apache.jsp.jsp.zfsmodule.AppendPoolDevicesPageView_jsp._jspx_meth_cc_actiontable_0(AppendPoolDevicesPageView_jsp.java:352)
     at org.apache.jsp.jsp.zfsmodule.AppendPoolDevicesPageView_jsp._jspx_meth_jato_pagelet_0(AppendPoolDevicesPageView_jsp.java:180)
     at org.apache.jsp.jsp.zfsmodule.AppendPoolDevicesPageView_jsp._jspService(AppendPoolDevicesPageView_jsp.java:56)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     at sun.reflect.GeneratedMethodAccessor64.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:243)
     at java.security.AccessController.doPrivileged(Native Method)
     at javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
     at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:272)
     at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:161)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:245)
     at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:50)
     at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:156)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:152)
     at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:696)
     at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:585)
     at org.apache.catalina.core.ApplicationDispatcher.access$100(ApplicationDispatcher.java:71)
     at org.apache.catalina.core.ApplicationDispatcher$PrivilegedInclude.run(ApplicationDispatcher.java:102)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:501)
     at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:966)
     at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:602)
     at com.sun.web.ui.taglib.wizard.CCWizardTag.getWizardPageHTML(CCWizardTag.java:1564)
     at com.sun.web.ui.taglib.wizard.CCWizardTag.appendPageletBodyContentHTML(CCWizardTag.java:668)
     at com.sun.web.ui.taglib.wizard.CCWizardTag.appendWizardBodyHTML(CCWizardTag.java:658)
     at com.sun.web.ui.taglib.wizard.CCWizardTag.getHTMLStringInternal(CCWizardTag.java:469)
     at com.sun.web.ui.taglib.common.CCTagBase.doEndTag(CCTagBase.java:114)
     at org.apache.jsp.com_005fsun_005fweb_005fui.jsp.wizard.WizardWindow_jsp._jspx_meth_cc_wizard_0(WizardWindow_jsp.java:271)
     at org.apache.jsp.com_005fsun_005fweb_005fui.jsp.wizard.WizardWindow_jsp._jspService(WizardWindow_jsp.java:182)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     at sun.reflect.GeneratedMethodAccessor64.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:243)
     at java.security.AccessController.doPrivileged(Native Method)
     at javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
     at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:272)
     at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:161)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:245)
     at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:50)
     at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:156)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:152)
     at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:696)
     at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:474)
     at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:409)
     at org.apache.catalina.core.ApplicationDispatcher.access$000(ApplicationDispatcher.java:71)
     at org.apache.catalina.core.ApplicationDispatcher$PrivilegedForward.run(ApplicationDispatcher.java:86)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:304)
     at com.iplanet.jato.view.ViewBeanBase.forward(ViewBeanBase.java:340)
     at com.iplanet.jato.view.ViewBeanBase.forwardTo(ViewBeanBase.java:261)
     at com.sun.web.ui.view.wizard.CCWizard.handleNextButtonRequest(CCWizard.java:730)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at com.iplanet.jato.view.command.DefaultRequestHandlingCommand.execute(DefaultRequestHandlingCommand.java:183)
     at com.iplanet.jato.view.RequestHandlingViewBase.handleRequest(RequestHandlingViewBase.java:308)
     at com.iplanet.jato.view.ViewBeanBase.dispatchInvocation(ViewBeanBase.java:802)
     at com.iplanet.jato.view.ViewBeanBase.invokeRequestHandlerInternal(ViewBeanBase.java:740)
     at com.iplanet.jato.view.ViewBeanBase.invokeRequestHandlerInternal(ViewBeanBase.java:760)
     at com.iplanet.jato.view.ViewBeanBase.invokeRequestHandler(ViewBeanBase.java:571)
     at com.iplanet.jato.ApplicationServletBase.dispatchRequest(ApplicationServletBase.java:957)
     at com.iplanet.jato.ApplicationServletBase.processRequest(ApplicationServletBase.java:615)
     at com.iplanet.jato.ApplicationServletBase.doPost(ApplicationServletBase.java:473)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     at sun.reflect.GeneratedMethodAccessor64.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:243)
     at java.security.AccessController.doPrivileged(Native Method)
     at javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
     at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:272)
     at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:161)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:245)
     at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:50)
     at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:156)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:152)
     at com.sun.management.services.session.CoreSessionManagerFilter.handleRequest(CoreSessionManagerFilter.java:638)
     at com.sun.management.services.session.CoreSessionManagerFilter.doFilter(CoreSessionManagerFilter.java:401)
     at sun.reflect.GeneratedMethodAccessor63.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:243)
     at java.security.AccessController.doPrivileged(Native Method)
     at javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
     at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:272)
     at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:217)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:197)
     at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:50)
     at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:156)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:152)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
     at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
     at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
     at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
     at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
     at java.lang.Thread.run(Thread.java:595)
Caused by: java.lang.NullPointerException
     at com.sun.org.apache.xpath.internal.axes.AxesWalker.setRoot(AxesWalker.java:218)
     at com.sun.org.apache.xpath.internal.axes.WalkingIterator.setRoot(WalkingIterator.java:153)
     at com.sun.org.apache.xpath.internal.axes.NodeSequence.setRoot(NodeSequence.java:212)
     at com.sun.org.apache.xpath.internal.axes.LocPathIterator.execute(LocPathIterator.java:211)
     at com.sun.org.apache.xpath.internal.XPath.execute(XPath.java:268)
     ... 148 more
java.lang.NullPointerException
     at com.sun.org.apache.xpath.internal.axes.AxesWalker.setRoot(AxesWalker.java:218)
     at com.sun.org.apache.xpath.internal.axes.WalkingIterator.setRoot(WalkingIterator.java:153)
     at com.sun.org.apache.xpath.internal.axes.NodeSequence.setRoot(NodeSequence.java:212)
     at com.sun.org.apache.xpath.internal.axes.LocPathIterator.execute(LocPathIterator.java:211)
     at com.sun.org.apache.xpath.internal.XPath.execute(XPath.java:268)
     at com.sun.org.apache.xpath.internal.jaxp.XPathImpl.eval(XPathImpl.java:213)
     at com.sun.org.apache.xpath.internal.jaxp.XPathImpl.evaluate(XPathImpl.java:275)
     at com.sun.zfs.common.model.XMLDataModel.getAvailableDisks(XMLDataModel.java:466)
     at com.sun.zfs.common.model.LockhartDataModel.getAvailableDisks(LockhartDataModel.java:34)
     at com.sun.zfs.web.admin.zfsmodule.model.AvailableDevicesTableModel.<init>(AvailableDevicesTableModel.java:34)
     at com.sun.zfs.web.admin.zfsmodule.model.AvailableDevicesTableModel.<init>(AvailableDevicesTableModel.java:60)
     at com.sun.zfs.web.admin.zfsmodule.view.AvailableDevicesTableViewHelper.createTableModel(AvailableDevicesTableViewHelper.java:111)
     at com.sun.zfs.web.admin.zfsmodule.view.TableViewHelper.createChild(TableViewHelper.java:62)
     at com.sun.zfs.web.admin.zfsmodule.view.AvailableDevicesTableViewHelper.createChild(AvailableDevicesTableViewHelper.java:86)
     at com.sun.zfs.web.admin.zfsmodule.wizard.common.WizardPageView.createChild(WizardPageView.java:159)
     at com.sun.zfs.web.admin.zfsmodule.wizard.appendpool.AppendPoolDevicesPageView.createChild(AppendPoolDevicesPageView.java:83)
     at com.iplanet.jato.view.ContainerViewBase.ensureChild(ContainerViewBase.java:187)
     at com.iplanet.jato.view.ContainerViewBase.getChild(ContainerViewBase.java:541)
     at com.iplanet.jato.view.ContainerViewBase.beginChildDisplay(ContainerViewBase.java:819)
     at com.iplanet.jato.taglib.TagBase.fireBeginDisplayEvent(TagBase.java:133)
     at com.sun.web.ui.taglib.common.CCTagBase.fireBeginDisplayEvent(CCTagBase.java:149)
     at com.sun.web.ui.taglib.common.CCTagBase.doEndTag(CCTagBase.java:108)
     at org.apache.jsp.jsp.zfsmodule.AppendPoolDevicesPageView_jsp._jspx_meth_cc_actiontable_0(AppendPoolDevicesPageView_jsp.java:352)
     at org.apache.jsp.jsp.zfsmodule.AppendPoolDevicesPageView_jsp._jspx_meth_jato_pagelet_0(AppendPoolDevicesPageView_jsp.java:180)
     at org.apache.jsp.jsp.zfsmodule.AppendPoolDevicesPageView_jsp._jspService(AppendPoolDevicesPageView_jsp.java:56)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     at sun.reflect.GeneratedMethodAccessor64.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:243)
     at java.security.AccessController.doPrivileged(Native Method)
     at javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
     at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:272)
     at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:161)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:245)
     at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:50)
     at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:156)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:152)
     at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:696)
     at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:585)
     at org.apache.catalina.core.ApplicationDispatcher.access$100(ApplicationDispatcher.java:71)
     at org.apache.catalina.core.ApplicationDispatcher$PrivilegedInclude.run(ApplicationDispatcher.java:102)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:501)
     at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:966)
     at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:602)
     at com.sun.web.ui.taglib.wizard.CCWizardTag.getWizardPageHTML(CCWizardTag.java:1564)
     at com.sun.web.ui.taglib.wizard.CCWizardTag.appendPageletBodyContentHTML(CCWizardTag.java:668)
     at com.sun.web.ui.taglib.wizard.CCWizardTag.appendWizardBodyHTML(CCWizardTag.java:658)
     at com.sun.web.ui.taglib.wizard.CCWizardTag.getHTMLStringInternal(CCWizardTag.java:469)
     at com.sun.web.ui.taglib.common.CCTagBase.doEndTag(CCTagBase.java:114)
     at org.apache.jsp.com_005fsun_005fweb_005fui.jsp.wizard.WizardWindow_jsp._jspx_meth_cc_wizard_0(WizardWindow_jsp.java:271)
     at org.apache.jsp.com_005fsun_005fweb_005fui.jsp.wizard.WizardWindow_jsp._jspService(WizardWindow_jsp.java:182)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     at sun.reflect.GeneratedMethodAccessor64.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:243)
     at java.security.AccessController.doPrivileged(Native Method)
     at javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
     at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:272)
     at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:161)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:245)
     at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:50)
     at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:156)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:152)
     at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:696)
     at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:474)
     at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:409)
     at org.apache.catalina.core.ApplicationDispatcher.access$000(ApplicationDispatcher.java:71)
     at org.apache.catalina.core.ApplicationDispatcher$PrivilegedForward.run(ApplicationDispatcher.java:86)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:304)
     at com.iplanet.jato.view.ViewBeanBase.forward(ViewBeanBase.java:340)
     at com.iplanet.jato.view.ViewBeanBase.forwardTo(ViewBeanBase.java:261)
     at com.sun.web.ui.view.wizard.CCWizard.handleNextButtonRequest(CCWizard.java:730)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at com.iplanet.jato.view.command.DefaultRequestHandlingCommand.execute(DefaultRequestHandlingCommand.java:183)
     at com.iplanet.jato.view.RequestHandlingViewBase.handleRequest(RequestHandlingViewBase.java:308)
     at com.iplanet.jato.view.ViewBeanBase.dispatchInvocation(ViewBeanBase.java:802)
     at com.iplanet.jato.view.ViewBeanBase.invokeRequestHandlerInternal(ViewBeanBase.java:740)
     at com.iplanet.jato.view.ViewBeanBase.invokeRequestHandlerInternal(ViewBeanBase.java:760)
     at com.iplanet.jato.view.ViewBeanBase.invokeRequestHandler(ViewBeanBase.java:571)
     at com.iplanet.jato.ApplicationServletBase.dispatchRequest(ApplicationServletBase.java:957)
     at com.iplanet.jato.ApplicationServletBase.processRequest(ApplicationServletBase.java:615)
     at com.iplanet.jato.ApplicationServletBase.doPost(ApplicationServletBase.java:473)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     at sun.reflect.GeneratedMethodAccessor64.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:243)
     at java.security.AccessController.doPrivileged(Native Method)
     at javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
     at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:272)
     at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:161)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:245)
     at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:50)
     at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:156)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:152)
     at com.sun.management.services.session.CoreSessionManagerFilter.handleRequest(CoreSessionManagerFilter.java:638)
     at com.sun.management.services.session.CoreSessionManagerFilter.doFilter(CoreSessionManagerFilter.java:401)
     at sun.reflect.GeneratedMethodAccessor63.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:243)
     at java.security.AccessController.doPrivileged(Native Method)
     at javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
     at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:272)
     at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:217)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:197)
     at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:50)
     at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:156)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:152)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
     at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
     at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
     at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
     at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
     at java.lang.Thread.run(Thread.java:595)
--------------- linked to ------------------
javax.xml.xpath.XPathExpressionException
     at com.sun.org.apache.xpath.internal.jaxp.XPathImpl.evaluate(XPathImpl.java:289)
     at com.sun.zfs.common.model.XMLDataModel.getAvailableDisks(XMLDataModel.java:466)
     at com.sun.zfs.common.model.LockhartDataModel.getAvailableDisks(LockhartDataModel.java:34)
     at com.sun.zfs.web.admin.zfsmodule.model.AvailableDevicesTableModel.<init>(AvailableDevicesTableModel.java:34)
     at com.sun.zfs.web.admin.zfsmodule.model.AvailableDevicesTableModel.<init>(AvailableDevicesTableModel.java:60)
     at com.sun.zfs.web.admin.zfsmodule.view.AvailableDevicesTableViewHelper.createTableModel(AvailableDevicesTableViewHelper.java:111)
     at com.sun.zfs.web.admin.zfsmodule.view.TableViewHelper.createChild(TableViewHelper.java:62)
     at com.sun.zfs.web.admin.zfsmodule.view.AvailableDevicesTableViewHelper.createChild(AvailableDevicesTableViewHelper.java:86)
     at com.sun.zfs.web.admin.zfsmodule.wizard.common.WizardPageView.createChild(WizardPageView.java:159)
     at com.sun.zfs.web.admin.zfsmodule.wizard.appendpool.AppendPoolDevicesPageView.createChild(AppendPoolDevicesPageView.java:83)
     at com.iplanet.jato.view.ContainerViewBase.ensureChild(ContainerViewBase.java:187)
     at com.iplanet.jato.view.ContainerViewBase.getChild(ContainerViewBase.java:541)
     at com.iplanet.jato.view.ContainerViewBase.beginChildDisplay(ContainerViewBase.java:819)
     at com.iplanet.jato.taglib.TagBase.fireBeginDisplayEvent(TagBase.java:133)
     at com.sun.web.ui.taglib.common.CCTagBase.fireBeginDisplayEvent(CCTagBase.java:149)
     at com.sun.web.ui.taglib.common.CCTagBase.doEndTag(CCTagBase.java:108)
     at org.apache.jsp.jsp.zfsmodule.AppendPoolDevicesPageView_jsp._jspx_meth_cc_actiontable_0(AppendPoolDevicesPageView_jsp.java:352)
     at org.apache.jsp.jsp.zfsmodule.AppendPoolDevicesPageView_jsp._jspx_meth_jato_pagelet_0(AppendPoolDevicesPageView_jsp.java:180)
     at org.apache.jsp.jsp.zfsmodule.AppendPoolDevicesPageView_jsp._jspService(AppendPoolDevicesPageView_jsp.java:56)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     at sun.reflect.GeneratedMethodAccessor64.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:243)
     at java.security.AccessController.doPrivileged(Native Method)
     at javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
     at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:272)
     at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:161)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:245)
     at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:50)
     at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:156)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:152)
     at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:696)
     at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:585)
     at org.apache.catalina.core.ApplicationDispatcher.access$100(ApplicationDispatcher.java:71)
     at org.apache.catalina.core.ApplicationDispatcher$PrivilegedInclude.run(ApplicationDispatcher.java:102)
     at java.security.AccessController.doPrivileged(Native Method)
     at or

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