jsp - java.lang.IllegalStateException: Component javax.faces.component.UIViewRoot@19ded20 not expected type -

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i'm retrieving exception when open jsf page. how caused , how can fix it?

org.apache.jasper.jasperexception: exception occurred processing jsp page /searchresultjsf.jsp @ line 18  15:     <body> 16:         <h1>search result</h1> 17:        18:         <h:datatable id ="abc" value="#{searchbean.dealerlist}" var="dealer"> 19:                           <h:column> 20:                               <f:facet name="header" > 21:                                   <h:outputtext value="dealer name "/>   stacktrace:     org.apache.jasper.servlet.jspservletwrapper.handlejspexception(jspservletwrapper.java:505)     org.apache.jasper.servlet.jspservletwrapper.service(jspservletwrapper.java:398)     org.apache.jasper.servlet.jspservlet.servicejspfile(jspservlet.java:342)     org.apache.jasper.servlet.jspservlet.service(jspservlet.java:267)     javax.servlet.http.httpservlet.service(httpservlet.java:717)     org.netbeans.modules.web.monitor.server.monitorfilter.dofilter(monitorfilter.java:390)     com.sun.faces.context.externalcontextimpl.dispatch(externalcontextimpl.java:408)     com.sun.faces.application.viewhandlerimpl.executepagetobuildview(viewhandlerimpl.java:442)     com.sun.faces.application.viewhandlerimpl.renderview(viewhandlerimpl.java:115)     com.sun.faces.lifecycle.renderresponsephase.execute(renderresponsephase.java:106)     com.sun.faces.lifecycle.lifecycleimpl.phase(lifecycleimpl.java:251)     com.sun.faces.lifecycle.lifecycleimpl.render(lifecycleimpl.java:144)     javax.faces.webapp.facesservlet.service(facesservlet.java:245)     org.netbeans.modules.web.monitor.server.monitorfilter.dofilter(monitorfilter.java:390)  root cause  javax.servlet.servletexception: javax.servlet.jsp.jspexception: java.lang.illegalstateexception: component javax.faces.component.uiviewroot@19ded20 not expected type.  expected: javax.faces.component.uidata.  perhaps you're missing tag?     org.apache.jasper.runtime.pagecontextimpl.dohandlepageexception(pagecontextimpl.java:858)     org.apache.jasper.runtime.pagecontextimpl.handlepageexception(pagecontextimpl.java:791)     org.apache.jsp.searchresultjsf_jsp._jspservice(searchresultjsf_jsp.java:94)     org.apache.jasper.runtime.httpjspbase.service(httpjspbase.java:70)     javax.servlet.http.httpservlet.service(httpservlet.java:717)     org.apache.jasper.servlet.jspservletwrapper.service(jspservletwrapper.java:374)     org.apache.jasper.servlet.jspservlet.servicejspfile(jspservlet.java:342)     org.apache.jasper.servlet.jspservlet.service(jspservlet.java:267)     javax.servlet.http.httpservlet.service(httpservlet.java:717)     org.netbeans.modules.web.monitor.server.monitorfilter.dofilter(monitorfilter.java:390)     com.sun.faces.context.externalcontextimpl.dispatch(externalcontextimpl.java:408)     com.sun.faces.application.viewhandlerimpl.executepagetobuildview(viewhandlerimpl.java:442)     com.sun.faces.application.viewhandlerimpl.renderview(viewhandlerimpl.java:115)     com.sun.faces.lifecycle.renderresponsephase.execute(renderresponsephase.java:106)     com.sun.faces.lifecycle.lifecycleimpl.phase(lifecycleimpl.java:251)     com.sun.faces.lifecycle.lifecycleimpl.render(lifecycleimpl.java:144)     javax.faces.webapp.facesservlet.service(facesservlet.java:245)     org.netbeans.modules.web.monitor.server.monitorfilter.dofilter(monitorfilter.java:390)  root cause  java.lang.illegalstateexception: component javax.faces.component.uiviewroot@19ded20 not expected type.  expected: javax.faces.component.uidata.  perhaps you're missing tag?     com.sun.faces.taglib.html_basic.datatabletag.setproperties(datatabletag.java:265)     javax.faces.webapp.uicomponentclassictagbase.findcomponent(uicomponentclassictagbase.java:604)     javax.faces.webapp.uicomponentclassictagbase.dostarttag(uicomponentclassictagbase.java:1126)     com.sun.faces.taglib.html_basic.datatabletag.dostarttag(datatabletag.java:372)     org.apache.jsp.searchresultjsf_jsp._jspx_meth_h_005fdatatable_005f0(searchresultjsf_jsp.java:117)     org.apache.jsp.searchresultjsf_jsp._jspservice(searchresultjsf_jsp.java:84)     org.apache.jasper.runtime.httpjspbase.service(httpjspbase.java:70)     javax.servlet.http.httpservlet.service(httpservlet.java:717)     org.apache.jasper.servlet.jspservletwrapper.service(jspservletwrapper.java:374)     org.apache.jasper.servlet.jspservlet.servicejspfile(jspservlet.java:342)     org.apache.jasper.servlet.jspservlet.service(jspservlet.java:267)     javax.servlet.http.httpservlet.service(httpservlet.java:717)     org.netbeans.modules.web.monitor.server.monitorfilter.dofilter(monitorfilter.java:390)     com.sun.faces.context.externalcontextimpl.dispatch(externalcontextimpl.java:408)     com.sun.faces.application.viewhandlerimpl.executepagetobuildview(viewhandlerimpl.java:442)     com.sun.faces.application.viewhandlerimpl.renderview(viewhandlerimpl.java:115)     com.sun.faces.lifecycle.renderresponsephase.execute(renderresponsephase.java:106)     com.sun.faces.lifecycle.lifecycleimpl.phase(lifecycleimpl.java:251)     com.sun.faces.lifecycle.lifecycleimpl.render(lifecycleimpl.java:144)     javax.faces.webapp.facesservlet.service(facesservlet.java:245)     org.netbeans.modules.web.monitor.server.monitorfilter.dofilter(monitorfilter.java:390)

this important bit:

javax.servlet.servletexception: javax.servlet.jsp.jspexception: java.lang.illegalstateexception: component javax.faces.component.uiviewroot@19ded20 not expected type. expected: javax.faces.component.uidata. perhaps you're missing tag?

you forgot wrap page jsf tags within <f:view>. page has this:

<%@taglib uri="http://java.sun.com/jsf/core" prefix="f" %> <%@taglib uri="http://java.sun.com/jsf/html" prefix="h" %> <!doctype html> <f:view>     <html lang="en">         <head>             <title>insert title here</title>         </head>         <body>             insert content here         </body>     </html> </f:view>

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