At first Clicking on Register new user,After that Go to Administration tab on that Click on settings, then that time the following error shows,

Exception during request processing:
Caused by javax.servlet.ServletException with message: "#{addRegister.addRegister}: javax.ejb.EJBTransactionRolledbackException: node to traverse cannot be null!"

javax.faces.webapp.FacesServlet.service(FacesServlet.java:277)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:85)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:44)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:141)
org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:281)
org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:60)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:58)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:68)
org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:182)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:432)
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
java.lang.Thread.run(Unknown Source)




The Code is as follows,


AddRegister.java

package org.jboss.seam.example.projectmanager1;

import javax.ejb.Local;

@Local
public interface AddRegister {
    public void addRegister();
    public void invalid();
    public String getVerify();
    public void setVerify(String verify);
    public boolean isRegistered();
         public void destroy();

}


AddRegisterAction.java
   package org.jboss.seam.example.projectmanager1;

import static org.jboss.seam.ScopeType.EVENT;

import java.util.List;

import javax.ejb.Remove;
import javax.ejb.Stateful;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

import org.jboss.seam.annotations.In;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.Scope;
import org.jboss.seam.faces.FacesMessages;

@Stateful
@Scope(EVENT)
@Name("addRegister")
public class AddRegisterAction implements AddRegister {
   @In
private AddUser add;
   @PersistenceContext
EntityManager em;
   @In
private FacesMessages facesMessages;
   private String verify;
   private boolean registered;
   public void addRegister()
{
  if(add.getPassword().equals(verify))
  {
   List existing=em.createQuery("selecu u.name,u.email from AddUser u where u.name=#{add.name} or u.email=#{add.email}").getResultList();
   if(existing.size()==0)
   {
    em.persist(add);
       facesMessages.add("Successfully registered as #{add.name}");
    registered=true;
   }
   else
   {
    facesMessages.addToControl("name", "Name #{add.name}/Email #{add.email} already exists");
   }
  }
  else
       {
          facesMessages.addToControl("verify", "Re-enter your password");
          verify=null;
       }
}

      public String getVerify() {
     return verify;
}
public void setVerify(String verify) {
   this.verify = verify;
    }

   public void invalid() {
   facesMessages.add("Please try again");
    }

   public boolean isRegistered() {
     return registered;
}

   @Remove
public void destroy() {
       }



}

AddUser.java

package org.jboss.seam.example.projectmanager1;

import java.io.Serializable;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

import org.hibernate.validator.Length;
import org.hibernate.validator.NotNull;
import org.jboss.seam.annotations.In;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.Out;
import org.jboss.seam.annotations.Scope;

import static org.jboss.seam.ScopeType.SESSION;

@Entity
@Name("add")
@Scope(SESSION)
@Table(name="Adduser")

public class AddUser implements Serializable{
         private String name;
  private String password;
  private String email;
  private String hourlyrate;
  private String role;
              @Id
        @Length(min=4,max=10)
  public String getName() {
   return name;
  }

  public void setName(String name) {
   this.name = name;
  }
  @NotNull
  @Length(min=5,max=8)
  public String getPassword() {
   return password;
  }

  public void setPassword(String password) {
   password = password;
  }
  @NotNull
  public String getEmail() {
   return email;
  }

  public void setEmail(String email) {
   this.email = email;
  }
  @NotNull
  public String getHourlyrate() {
   return hourlyrate;
  }
    public void setHourlyrate(String hourlyrate) {
   this.hourlyrate = hourlyrate;
  }
  @NotNull
  public String getRole() {
   return role;
  }

  public void setRole(String role) {
   this.role = role;
  }
             }

adduserform.xhtml


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
   xmlns:ui="http://java.sun.com/jsf/facelets"
   xmlns:h="http://java.sun.com/jsf/html"
   xmlns:f="http://java.sun.com/jsf/core"
      xmlns:s="http://jboss.com/products/seam/taglib"
      xmlns:a="http://richfaces.org/a4j">

<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<link href="stylesheet/bcolor.css" type="text/css" rel="stylesheet"/>
   <title>Project Management</title>
</head>

<body class="bccolor">
      <h:form >
    <ui:include src="projecthome.xhtml" />
         <h:messages globalOnly="true" styleClass="message"/>
    <s:validateAll>
      <f:facet name="aroundInvalidField">
            <s:span styleClass="errors"/>
          </f:facet>
          <f:facet name="afterInvalidField">
            <s:span>&#160;<s:message/></s:span>
          </f:facet>
     <table class="centeralign" border="1px">
      <tr>
       <td style="COLOR: #c0c0c0; FONT-SIZE: large;"> UserName</td>
       <td>
        <s:decorate><h:inputText id="name" value="#{add.name}" required="true"/></s:decorate>
       </td>
      </tr>
      <tr>
       <td style="COLOR: #c0c0c0; FONT-SIZE: large;">E-mail</td>
       <td>
        <s:decorate><h:inputText id="email" value="#{add.email}" required="true"/></s:decorate>
       </td>
      </tr>
             <tr>
      <td style="COLOR: #c0c0c0; FONT-SIZE: large;">Password</td>
      <td>
       <s:decorate><h:inputSecret id="password" value="#{add.password}" required="true"/></s:decorate>
      </td>
      </tr>
      <tr>
      <td style="COLOR: #c0c0c0; FONT-SIZE: large;">Re-Password</td>
      <td>
       <s:decorate><h:inputSecret id="verify" value="#{addRegister.verify}" required="true"/></s:decorate>
      </td>
      </tr>
                    <tr>
       <td style="COLOR: #c0c0c0; FONT-SIZE: large;">Hourly rate</td>
       <td>
        <s:decorate><h:inputText id="hourlyrate" value="#{add.hourlyrate}" required="true"/></s:decorate>
       </td>
      </tr>
      <tr>
       <td style="COLOR: #c0c0c0; FONT-SIZE: large;">Role</td>
       <td>
        <h:selectOneRadio value="#{add.role}" id="role">
         <f:selectItem itemLabel="client" itemValue="1"/>
         <f:selectItem itemLabel="user" itemValue="2"/>
         <f:selectItem itemLabel="Admin" itemValue="3"/>
        </h:selectOneRadio>
                </td>
       </tr>
            </table>
     <div class="buttonBox ">
      <h:commandButton id="addRegister" value="Add" action="#{addRegister.addRegister}"/>
      &#160;
      <s:button id="cancel" value="Close" view="/loginpage.xhtml"/>
           </div>
               </s:validateAll>
                        </h:form>
      </body>

</html>