jsf - Update form on h:commandButton action -

i have button per row in h:datatable deletes record. action works deletes record. table doesn't update, i'm not sure what's wrong? here's jsf

    <h:form id="usersform" rendered="#{not empty usercontroller.users}">         <h:datatable id="userstable" value="#{usercontroller.users}" var="user">             <h:column>#{user.name}</h:column>             <h:column>#{user.location.location}</h:column>             <h:column>                 <h:commandbutton value="delete" action="#{usercontroller.delete(user)}">                     <f:ajax render="usersform userstable"/>                 </h:commandbutton>             </h:column>         </h:datatable>     </h:form> 

edit: don't believe answer pointed quite same, after @ answer found generated html had table defined <table id="usersform:userstable"> modified jsf follows

    <h:form id="usersform" rendered="#{not empty usercontroller.users}">         <h:datatable id="userstable" value="#{usercontroller.users}" var="user">             <h:column>#{user.name}</h:column>             <h:column>#{user.location.location}</h:column>             <h:column>                 <h:commandbutton value="delete" action="#{usercontroller.delete(user)}">                     <f:ajax render=":usersform:userstable"/>                 </h:commandbutton>             </h:column>         </h:datatable>     </h:form> 

it still doesn't update. bit of additional detail outside of form have filter form update table when actioned, here complete jsf

    <h:form id="filterform">         <h:selectbooleancheckbox id="selectall" value="#{usercontroller.userfilter.allusers}" title="allusers">             <f:ajax render="filtergrid usersform" listener="#{usercontroller.listallusers}"/>         </h:selectbooleancheckbox><h:outputtext value ="all users"/>         <h:panelgrid id="filtergrid" columns="3">             <h:inputtext id="username" value="#{usercontroller.userfilter.username}" disabled="#{usercontroller.userfilter.allusers}"/>             <h:selectonemenu id="selectlocation" value="#{usercontroller.userfilter.location}" disabled="#{usercontroller.userfilter.allusers}">                 <f:selectitems value="#{usercontroller.locations}" var="location" itemvalue="#{location.location}" itemlabel="#{location.location}"/>             </h:selectonemenu>             <h:commandbutton id="filterbutton" value="filter" disabled="#{usercontroller.userfilter.allusers}" action="#{usercontroller.findusers()}"/>         </h:panelgrid>     </h:form>     <h:form id="usersform" rendered="#{not empty usercontroller.users}">         <h:datatable id="userstable" value="#{usercontroller.users}" var="user">             <h:column>#{user.name}</h:column>             <h:column>#{user.location.location}</h:column>             <h:column>                 <h:commandbutton value="delete" action="#{usercontroller.delete(user)}">                     <f:ajax render=":usersform:userstable"/>                 </h:commandbutton>             </h:column>         </h:datatable>     </h:form> 

and controller bean

@named @viewscoped public class usercontroller implements serializable {      @inject     private userservice userservice;          private list<user> users;          private user user;      /**      * init method used initialise users list      */     @postconstruct     public void init()     {         users = userservice.listall();     }      /**      * delete specified user      *      * @param user user deleted      */     public void delete(user user)     {         userservice.deleteuser(user);     }          } 

and service

@stateless public class userservice {      @persistencecontext(unitname = "usersjsfapplicationpu")     private entitymanager em;      /**      * deletes specified user database      *      * @param user delete      */     public void deleteuser(user user)     {         user usr = em.find(user.class, user.getid());         em.remove(usr);     }      /**      * returns list of users      *      * @return user list      */     public list<user> listall()     {         return em.createquery("select u user u").getresultlist();     }  } 

argh school boy error, controller delete method wrong, needs be

/**  * delete specified user  *  * @param user user deleted  */ public void delete(user user) {     userservice.deleteuser(user);     users = userservice.listall(); }