1 Reply Latest reply on Nov 29, 2006 7:23 AM by Gavin King

    Seam throws exception while working with DataModel

    Alexander Filipchik Newbie

      Hello.
      I'm new to seam and i want to integrate seam capability with AndroMDA product.
      I use AndroMDA for generating EJB3 and DAOs.
      I made a simple application that allows users login and see userlist.

      There are some strangeness:
      After user login he able to see userslist. There are an link to CreateNewUser from that page. When user created it's rediercts toViewAllUsers. All work's fine, but:
      When i add capability to delete User (delete button in userlist according to seam examples) i got an error:

      12:07:22,138 ERROR [[Faces Servlet]] Servlet.service() for servlet Faces Servlet threw exception
      javax.faces.FacesException: Error calling action method of component with id _id0:_id2_4:_id13
       at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:7
      4)
       at javax.faces.component.UICommand.broadcast(UICommand.java:106)
       at javax.faces.component.UIData.broadcast(UIData.java:338)
       at javax.faces.component.UIViewRoot._broadcastForPhase(UIViewRoot.java:90)
       at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:164)
       at org.apache.myfaces.lifecycle.LifecycleImpl.invokeApplication(LifecycleImpl.java:316)
       at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:86)
       at javax.faces.webapp.FacesServlet.service(FacesServlet.java:106)
       at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.j
      ava:252)
       at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
      
       at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
       at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.j
      ava:202)
       at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
      
       at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
       at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
       at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.ja
      va:175)
       at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
       at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
       at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
       at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
       at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
       at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
       at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Htt
      p11BaseProtocol.java:664)
       at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
       at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
       at java.lang.Thread.run(Thread.java:595)
      Caused by: javax.faces.el.EvaluationException: Exception while invoking expression #{userService.del
      eteUser}
       at org.apache.myfaces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:153)
       at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:6
      3)
       ... 25 more
      Caused by: javax.ejb.EJBException: java.lang.IllegalArgumentException: could not set field value: us
      erService.userDataModel
       at org.jboss.ejb3.tx.Ejb3TxPolicy.handleExceptionInOurTx(Ejb3TxPolicy.java:69)
       at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:83)
       at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:197)
       at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
       at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76)
       at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
       at org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor
      .java:62)
       at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
       at org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.jav
      a:78)
       at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
       at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:47)
       at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
       at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:1
      06)
       at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
       at org.jboss.ejb3.stateless.StatelessContainer.localInvoke(StatelessContainer.java:181)
       at org.jboss.ejb3.stateless.StatelessLocalProxy.invoke(StatelessLocalProxy.java:79)
       at $Proxy871.deleteUser(Unknown Source)
       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 org.apache.myfaces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:129)
       ... 26 more
      Caused by: java.lang.IllegalArgumentException: could not set field value: userService.userDataModel
       at org.jboss.seam.Component.setFieldValue(Component.java:1214)
       at org.jboss.seam.Component.injectDataModelSelection(Component.java:909)
       at org.jboss.seam.Component.injectDataModelSelection(Component.java:874)
       at org.jboss.seam.Component.inject(Component.java:796)
       at org.jboss.seam.interceptors.BijectionInterceptor.bijectTargetComponent(BijectionIntercept
      or.java:30)
       at sun.reflect.GeneratedMethodAccessor594.invoke(Unknown Source)
       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
       at java.lang.reflect.Method.invoke(Method.java:585)
       at org.jboss.seam.util.Reflections.invoke(Reflections.java:13)
       at org.jboss.seam.interceptors.Interceptor.aroundInvoke(Interceptor.java:90)
       at org.jboss.seam.interceptors.SeamInvocationContext.proceed(SeamInvocationContext.java:60)
       at org.jboss.seam.interceptors.ConversationInterceptor.endOrBeginLongRunningConversation(Con
      versationInterceptor.java:82)
       at sun.reflect.GeneratedMethodAccessor593.invoke(Unknown Source)
       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
       at java.lang.reflect.Method.invoke(Method.java:585)
       at org.jboss.seam.util.Reflections.invoke(Reflections.java:13)
       at org.jboss.seam.interceptors.Interceptor.aroundInvoke(Interceptor.java:90)
       at org.jboss.seam.interceptors.SeamInvocationContext.proceed(SeamInvocationContext.java:60)
       at org.jboss.seam.interceptors.BusinessProcessInterceptor.manageBusinessProcessContext(Busin
      essProcessInterceptor.java:60)
       at sun.reflect.GeneratedMethodAccessor592.invoke(Unknown Source)
       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
       at java.lang.reflect.Method.invoke(Method.java:585)
       at org.jboss.seam.util.Reflections.invoke(Reflections.java:13)
       at org.jboss.seam.interceptors.Interceptor.aroundInvoke(Interceptor.java:90)
       at org.jboss.seam.interceptors.SeamInvocationContext.proceed(SeamInvocationContext.java:60)
       at org.jboss.seam.interceptors.RemoveInterceptor.removeIfNecessary(RemoveInterceptor.java:39
      )
       at sun.reflect.GeneratedMethodAccessor591.invoke(Unknown Source)
       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
       at java.lang.reflect.Method.invoke(Method.java:585)
       at org.jboss.seam.util.Reflections.invoke(Reflections.java:13)
       at org.jboss.seam.interceptors.Interceptor.aroundInvoke(Interceptor.java:90)
       at org.jboss.seam.interceptors.SeamInvocationContext.proceed(SeamInvocationContext.java:60)
       at org.jboss.seam.ejb.SeamInterceptor.aroundInvokeInContexts(SeamInterceptor.java:73)
       at org.jboss.seam.ejb.SeamInterceptor.aroundInvoke(SeamInterceptor.java:45)
       at sun.reflect.GeneratedMethodAccessor656.invoke(Unknown Source)
       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
       at java.lang.reflect.Method.invoke(Method.java:585)
       at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:118)
       at org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor
      .java:63)
       at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
       at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedE
      ntityManagerInterceptor.java:54)
       at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
       at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)
       at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
       at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:79)
       ... 46 more
      Caused by: java.lang.IllegalArgumentException
       at sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:63)
       at java.lang.reflect.Field.set(Field.java:656)
       at org.jboss.seam.Component.setFieldValue(Component.java:1210)
       ... 90 more
      


      I try many wariants and now i'm going mad

      There are code of my userService class:
      @Name("userService")
      @Stateless
      @Scope(SESSION)
      
      @javax.ejb.Local({com.accarda.manobobs.service.UsersServiceLocal.class})
      @javax.ejb.Remote({com.accarda.manobobs.service.UsersServiceRemote.class})
      @Interceptors(SeamInterceptor.class)
      public class UsersServiceBean extends
       com.accarda.manobobs.service.UsersServiceBase {
      
       //seam injections
       @In(required=false)
       private UserVO2Seam userVO2Seam;
      
       @Logger
       private Log log;
      
       @DataModel
       private List<UserVO2Seam> userDataModel;
       @DataModelSelection
       @In(required=false)
       @Out(required=false)
       private UserVO2Seam selectionUser;
       // --------------- Constructors ---------------
      
       public UsersServiceBean() {
       super();
       }
      
      
       public List<UserVO2Seam> getUserDataModel() {
       return userDataModel;
       }
      
      
       public void setUserDataModel(List<UserVO2Seam> userDataModel) {
       this.userDataModel = userDataModel;
       }
      
      
       // -------- Business Methods Impl --------------
       protected void handleSelect() throws Exception {
       // TODO Auto-generated method stub
       }
       /**
       * @see com.accarda.manobobs.service.UsersServiceBase#createUser(com.accarda.manobobs.model.vo.UsersVO[])
       */
       protected String handleCreateUserFromSeam() throws Exception {
       String result = "userlist";
       try{
       updateUser(userVO2Seam);
       userDataModel = new ArrayList(getUsersDao().loadAll(UsersDao.TRANSFORM_USERSVO));
       } catch (Exception e) {
       log.error(e.getMessage());
       result = "creatingerror";
       FacesMessages.instance().add("Nick name must be unique");
       }
      
       return result;
       }
      
      
      
       /**
       * @see com.accarda.manobobs.service.UsersServiceBase#updateUser(UsersVO)
       */
       protected void handleUpdateUser(UsersVO userVO) throws Exception {
       getUsersDao().update(getUsersDao().usersVOToEntity(userVO));
       }
      
      
       /**
       * @see com.accarda.manobobs.service.UsersServiceBase#deleteUser()
       */
       protected void handleDeleteUser() throws Exception {
       if(selectionUser != null){
       getUsersDao().remove(selectionUser.getId());
       userDataModel.remove(selectionUser);
       }
       }
      
       /**
       * @see com.accarda.manobobs.service.UsersServiceBase#createUser(com.accarda.manobobs.model.vo.UsersVO[])
       */
       protected void handleCreateUser(com.accarda.manobobs.model.vo.UsersVO userVO)
       throws java.lang.Exception {
       getUsersDao().create(userVO.getFirstName(), userVO.getLastName(),
       userVO.getPassword(), userVO.getNickname());
       log.info("User Created");
       }
      
       /**
       * @see com.accarda.manobobs.service.UsersServiceBase#populateUsers()
       */
      
       protected void handlePopulateUsers() throws Exception {
      
       }
      
       @Factory("userDataModel")
       public void findUsers() {
       log.info("-------POPULATING-----USERS-------");
       try{
       userDataModel = new ArrayList(getUsersDao().loadAll(UsersDao.TRANSFORM_USERSVO));
       } catch (Throwable th) {
       log.error(th);
       }
      
       }
       /**
       * @see com.accarda.manobobs.service.UsersServiceBase#deleteUser(java.lang.Long)
       */
       protected void handleDeleteUser(java.lang.Long id)
       throws java.lang.Exception {
       // TODO: put your implementation here.
       throw new java.lang.UnsupportedOperationException(
       "com.accarda.manobobs.service.UsersServiceBean.handleDeleteUser(java.lang.Long id) Not implemented!");
       }
      
       /**
       * @see com.accarda.manobobs.service.UsersServiceBase#getUser(java.lang.Long)
       */
       protected com.accarda.manobobs.model.vo.UsersVO handleGetUser(
       java.lang.Long id) throws java.lang.Exception {
       // TODO: put your implementation here.
       // Dummy return value, just that the file compiles
       return null;
       }
      
       /**
       * @see com.accarda.manobobs.service.UsersServiceBase#getAllUsers()
       */
       protected com.accarda.manobobs.model.vo.UsersVO[] handleGetAllUsers()
       throws java.lang.Exception {
       // TODO: put your implementation here.
       // Dummy return value, just that the file compiles
       return null;
       }
      
      
       // -------- Lifecycle Callback Impl --------------
      
      }
      


      UserServiceBase code:
      @javax.ejb.TransactionAttribute(javax.ejb.TransactionAttributeType.REQUIRED)
      @javax.ejb.Remote({com.accarda.manobobs.service.UsersServiceRemote.class})
      public abstract class UsersServiceBase
       implements com.accarda.manobobs.service.UsersServiceRemote
      {
       // ------ Session Context Injection ------
      
       @javax.annotation.Resource
       protected javax.ejb.SessionContext context;
      
       // ------ Persistence Context Definitions --------
      
       /**
       * Inject persistence context manobonsweb
       */
       @javax.persistence.PersistenceContext(unitName = "manobonsweb")
       protected javax.persistence.EntityManager emanager;
      
       // ------ DAO Injection Definitions --------
      
       /**
       * Inject DAO UsersDao
       */
       @javax.ejb.EJB
       private com.accarda.manobobs.model.domain.UsersDao usersDao;
      
       // --------------- Constructors ---------------
      
       public UsersServiceBase()
       {
       super();
       }
      
       // ------ DAO Getters --------
      
       /**
       * Get the injected DAO UsersDao
       */
       protected com.accarda.manobobs.model.domain.UsersDao getUsersDao()
       {
       return this.usersDao;
       }
      
       // -------- Business Methods --------------
      
       /**
       *
       */
       @javax.ejb.TransactionAttribute(javax.ejb.TransactionAttributeType.REQUIRED)
       public void createUser(com.accarda.manobobs.model.vo.UsersVO userVO)
       {
       if (userVO == null)
       {
       throw new IllegalArgumentException(
       "com.accarda.manobobs.service.UsersServiceBean.createUser(com.accarda.manobobs.model.vo.UsersVO userVO) - 'userVO' can not be null");
       }
       try
       {
       this.handleCreateUser(userVO);
       }
       catch (Throwable th)
       {
       throw new com.accarda.manobobs.service.UsersServiceException(
       "Error performing 'com.accarda.manobobs.service.UsersService.createUser(com.accarda.manobobs.model.vo.UsersVO userVO)' --> " + th,
       th);
       }
       }
      
       /**
       * Performs the core logic for {@link #createUser(com.accarda.manobobs.model.vo.UsersVO)}
       */
       protected abstract void handleCreateUser(com.accarda.manobobs.model.vo.UsersVO userVO)
       throws java.lang.Exception;
      
       /**
       *
       */
       @javax.ejb.TransactionAttribute(javax.ejb.TransactionAttributeType.REQUIRED)
       public void deleteUser(java.lang.Long id)
       {
       if (id == null)
       {
       throw new IllegalArgumentException(
       "com.accarda.manobobs.service.UsersServiceBean.deleteUser(java.lang.Long id) - 'id' can not be null");
       }
       try
       {
       this.handleDeleteUser(id);
       }
       catch (Throwable th)
       {
       throw new com.accarda.manobobs.service.UsersServiceException(
       "Error performing 'com.accarda.manobobs.service.UsersService.deleteUser(java.lang.Long id)' --> " + th,
       th);
       }
       }
      
       /**
       * Performs the core logic for {@link #deleteUser(java.lang.Long)}
       */
       protected abstract void handleDeleteUser(java.lang.Long id)
       throws java.lang.Exception;
      
       /**
       *
       */
       @javax.ejb.TransactionAttribute(javax.ejb.TransactionAttributeType.REQUIRED)
       public com.accarda.manobobs.model.vo.UsersVO getUser(java.lang.Long id)
       {
       if (id == null)
       {
       throw new IllegalArgumentException(
       "com.accarda.manobobs.service.UsersServiceBean.getUser(java.lang.Long id) - 'id' can not be null");
       }
       try
       {
       return this.handleGetUser(id);
       }
       catch (Throwable th)
       {
       throw new com.accarda.manobobs.service.UsersServiceException(
       "Error performing 'com.accarda.manobobs.service.UsersService.getUser(java.lang.Long id)' --> " + th,
       th);
       }
       }
      
       /**
       * Performs the core logic for {@link #getUser(java.lang.Long)}
       */
       protected abstract com.accarda.manobobs.model.vo.UsersVO handleGetUser(java.lang.Long id)
       throws java.lang.Exception;
      
       /**
       *
       */
       @javax.ejb.TransactionAttribute(javax.ejb.TransactionAttributeType.REQUIRED)
       public com.accarda.manobobs.model.vo.UsersVO[] getAllUsers()
       {
       try
       {
       return this.handleGetAllUsers();
       }
       catch (Throwable th)
       {
       throw new com.accarda.manobobs.service.UsersServiceException(
       "Error performing 'com.accarda.manobobs.service.UsersService.getAllUsers()' --> " + th,
       th);
       }
       }
      
       /**
       * Performs the core logic for {@link #getAllUsers()}
       */
       protected abstract com.accarda.manobobs.model.vo.UsersVO[] handleGetAllUsers()
       throws java.lang.Exception;
      
       /**
       *
       */
       @javax.ejb.TransactionAttribute(javax.ejb.TransactionAttributeType.REQUIRED)
       public java.lang.String createUserFromSeam()
       {
       try
       {
       return this.handleCreateUserFromSeam();
       }
       catch (Throwable th)
       {
       throw new com.accarda.manobobs.service.UsersServiceException(
       "Error performing 'com.accarda.manobobs.service.UsersService.createUserFromSeam()' --> " + th,
       th);
       }
       }
      
       /**
       * Performs the core logic for {@link #createUserFromSeam()}
       */
       protected abstract java.lang.String handleCreateUserFromSeam()
       throws java.lang.Exception;
      
       /**
       *
       */
       @javax.ejb.TransactionAttribute(javax.ejb.TransactionAttributeType.REQUIRED)
       public void populateUsers()
       {
       try
       {
       this.handlePopulateUsers();
       }
       catch (Throwable th)
       {
       throw new com.accarda.manobobs.service.UsersServiceException(
       "Error performing 'com.accarda.manobobs.service.UsersService.populateUsers()' --> " + th,
       th);
       }
       }
      
       /**
       * Performs the core logic for {@link #populateUsers()}
       */
       protected abstract void handlePopulateUsers()
       throws java.lang.Exception;
      
       /**
       *
       */
       @javax.ejb.TransactionAttribute(javax.ejb.TransactionAttributeType.REQUIRED)
       public void updateUser(com.accarda.manobobs.model.vo.UsersVO userVO)
       {
       if (userVO == null)
       {
       throw new IllegalArgumentException(
       "com.accarda.manobobs.service.UsersServiceBean.updateUser(com.accarda.manobobs.model.vo.UsersVO userVO) - 'userVO' can not be null");
       }
       try
       {
       this.handleUpdateUser(userVO);
       }
       catch (Throwable th)
       {
       throw new com.accarda.manobobs.service.UsersServiceException(
       "Error performing 'com.accarda.manobobs.service.UsersService.updateUser(com.accarda.manobobs.model.vo.UsersVO userVO)' --> " + th,
       th);
       }
       }
      
       /**
       * Performs the core logic for {@link #updateUser(com.accarda.manobobs.model.vo.UsersVO)}
       */
       protected abstract void handleUpdateUser(com.accarda.manobobs.model.vo.UsersVO userVO)
       throws java.lang.Exception;
      
       /**
       *
       */
       @javax.ejb.TransactionAttribute(javax.ejb.TransactionAttributeType.REQUIRED)
       public void deleteUser()
       {
       try
       {
       this.handleDeleteUser();
       }
       catch (Throwable th)
       {
       throw new com.accarda.manobobs.service.UsersServiceException(
       "Error performing 'com.accarda.manobobs.service.UsersService.deleteUser()' --> " + th,
       th);
       }
       }
      
       /**
       * Performs the core logic for {@link #deleteUser()}
       */
       protected abstract void handleDeleteUser()
       throws java.lang.Exception;
      
       /**
       *
       */
       @javax.ejb.TransactionAttribute(javax.ejb.TransactionAttributeType.REQUIRED)
       public void select()
       {
       try
       {
       this.handleSelect();
       }
       catch (Throwable th)
       {
       throw new com.accarda.manobobs.service.UsersServiceException(
       "Error performing 'com.accarda.manobobs.service.UsersService.select()' --> " + th,
       th);
       }
       }
      
       /**
       * Performs the core logic for {@link #select()}
       */
       protected abstract void handleSelect()
       throws java.lang.Exception;
      
      
       // -------- Lifecycle Callbacks --------------
      
      }
      


      And finally JSP code:
      <%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>
      <%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>
      <%@ taglib uri="http://jboss.com/products/seam/taglib" prefix="s"%>
      <html>
      <head>
      <title>Users</title>
      </head>
      <body>
      <f:view>
       <h:form>
       <h2>User List</h2>
       <h:outputText value="No users to display"
       rendered="#{userDataModel.rowCount==0}" />
       <h:dataTable var="user" value="#{userDataModel}"
       rendered="#{userDataModel.rowCount>0}">
       <h:column>
       <f:facet name="header">
       <h:outputText value="Nickname" />
       </f:facet>
       <h:commandLink value="#{user.nickname}" action="#{userService.select}"/>
       </h:column>
       <h:column>
       <f:facet name="header">
       <h:outputText value="First Name" />
       </f:facet>
       <h:outputText value="#{user.firstName}" />
       </h:column>
       <h:column>
       <f:facet name="header">
       <h:outputText value="Last Name" />
       </f:facet>
       <h:outputText value="#{user.lastName}" />
       </h:column>
       <h:column>
       <h:commandButton value="Delete" action="#{userService.deleteUser}" />
       </h:column>
       </h:dataTable>
      
       <h3><h:outputText value="#{selectionUser.firstName}" /></h3>
       <div><h:outputText value="#{selectionUser.lastName}" /></div>
      
       <s:link view="/user/CreateUser.jsp" value="Create User" />
       </h:form>
      </f:view>
      </body>
      </html>