Spring retrieving one user by id -

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i have on page list of users retrieved database. along users associated child objects, on same page instead of list of users, 1 user logged in application. restricted viewing of user details , should able view own specific details , child objects.

dao - method getting users

public list<module> getsettermodules(integer userid){        session session = sessionfactory.getcurrentsession();        query query = session.createquery("from userentity u                u.userid="+userid);        userentity userentity = (userentity) query.uniqueresult();        return  new arraylist<module>(userentity.getsmodule());

the dto retrieving list of users , associated objects retrieve 1 user (that authenticated) id , list of objects linked them. i'm attempting implementing this:

@requestmapping(value = "/main", method = requestmethod.get)  public string getrecords(@requestparam("userid") integer userid, modelmap           model) {      //retrieve 1 user      userentity user = userservice.getuserbyid(userid);      userentitydto userdto = new userentitydto();        userentitydto dto = new userentitydto();      dto.setuserid(user.getuserid());      dto.setsmodule(moduleservice.getsettermodules(user.getuserid()));      dto.setcmodule(moduleservice.getcheckermodules(user.getuserid()));       userdto.add(dto);      }      model.addattribute("user", userdto);         return "/main";}

i insight how proceed here or there simpler way of getting user.

new dao

@transactional public userentity getuserbyid(integer userid) {     session session = sessionfactory.getcurrentsession();      userentity userentity = (userentity) session.get(userentity.class, userid);     userentity.getsmodule();              return userentity;}

controller

   @requestmapping(value = "/main/user/testing", method = requestmethod.get)     public string getrecords(@requestparam("userid") integer userid, modelmap           model) {      userentity userentity = userservice.getuserbyid(userid);       model.addattribute("user", userentity);       return "/main/user/testing";  }

error 

     http status 400 - required integer parameter 'userid' not present

edit 2: above implementation url returning error above tried hardcode id url: 

   <c:url value="/main/user/testing/?userid=2" var="url"/><a href="<c:out      value='${url}'/>">test</a>

and changed controller to:

  @requestmapping(value = "/main/user/testing{userid}", method = requestmethod.get)     public string getrecords(@requestparam("userid") integer userid, modelmap           model) {      userentity userentity = userservice.getuserbyid(userid);       model.addattribute("user", userentity);       return "/main/user/testing";  }

but error now:

    javax.servlet.jsp.jsptagexception: don't know how iterate on supplied "items" in &lt;foreach&gt; org.apache.taglibs.standard.tag.common.core.foreachsupport.toforeachiterator(foreachsupport.java:274) org.apache.taglibs.standard.tag.common.core.foreachsupport.supportedtypeforeachiterator(foreachsupport.java:238) org.apache.taglibs.standard.tag.common.core.foreachsupport.prepare(foreachsupport.java:155) javax.servlet.jsp.jstl.core.looptagsupport.dostarttag(looptagsupport.java:256) org.apache.jsp.web_002dinf.views.main.user.testing_jsp._jspx_meth_c_005fforeach_005f0(testing_jsp.java:181) org.apache.jsp.web_002dinf.views.main.user.testing_jsp._jspservice(testing_jsp.java:125) org.apache.jasper.runtime.httpjspbase.service(httpjspbase.java:70) javax.servlet.http.httpservlet.service(httpservlet.java:728) org.apache.jasper.servlet.jspservletwrapper.service(jspservletwrapper.java:432) org.apache.jasper.servlet.jspservlet.servicejspfile(jspservlet.java:390) org.apache.jasper.servlet.jspservlet.service(jspservlet.java:334) javax.servlet.http.httpservlet.service(httpservlet.java:728) org.springframework.web.servlet.view.internalresourceview.rendermergedoutputmodel(internalresourceview.java:238) org.springframework.web.servlet.view.abstractview.render(abstractview.java:264) org.springframework.web.servlet.dispatcherservlet.render(dispatcherservlet.java:1208) org.springframework.web.servlet.dispatcherservlet.processdispatchresult(dispatcherservlet.java:992) org.springframework.web.servlet.dispatcherservlet.dodispatch(dispatcherservlet.java:939) org.springframework.web.servlet.dispatcherservlet.doservice(dispatcherservlet.java:856) org.springframework.web.servlet.frameworkservlet.processrequest(frameworkservlet.java:915) org.springframework.web.servlet.frameworkservlet.doget(frameworkservlet.java:811) javax.servlet.http.httpservlet.service(httpservlet.java:621) org.springframework.web.servlet.frameworkservlet.service(frameworkservlet.java:796) javax.servlet.http.httpservlet.service(httpservlet.java:728) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:330) org.springframework.security.web.access.intercept.filtersecurityinterceptor.invoke(filtersecurityinterceptor.java:118) org.springframework.security.web.access.intercept.filtersecurityinterceptor.dofilter(filtersecurityinterceptor.java:84) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:342) org.springframework.security.web.access.exceptiontranslationfilter.dofilter(exceptiontranslationfilter.java:113) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:342) org.springframework.security.web.session.sessionmanagementfilter.dofilter(sessionmanagementfilter.java:103) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:342) org.springframework.security.web.authentication.anonymousauthenticationfilter.dofilter(anonymousauthenticationfilter.java:113) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:342) org.springframework.security.web.servletapi.securitycontextholderawarerequestfilter.dofilter(securitycontextholderawarerequestfilter.java:54) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:342) org.springframework.security.web.savedrequest.requestcacheawarefilter.dofilter(requestcacheawarefilter.java:45) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:342) org.springframework.security.web.authentication.www.basicauthenticationfilter.dofilter(basicauthenticationfilter.java:150) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:342) org.springframework.security.web.authentication.abstractauthenticationprocessingfilter.dofilter(abstractauthenticationprocessingfilter.java:183) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:342) org.springframework.security.web.authentication.logout.logoutfilter.dofilter(logoutfilter.java:105) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:342) org.springframework.security.web.context.securitycontextpersistencefilter.dofilter(securitycontextpersistencefilter.java:87) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:342) org.springframework.security.web.access.channel.channelprocessingfilter.dofilter(channelprocessingfilter.java:144) org.springframework.security.web.filterchainproxy$virtualfilterchain.dofilter(filterchainproxy.java:342) org.springframework.security.web.filterchainproxy.dofilterinternal(filterchainproxy.java:192) org.springframework.security.web.filterchainproxy.dofilter(filterchainproxy.java:160) org.springframework.web.filter.delegatingfilterproxy.invokedelegate(delegatingfilterproxy.java:346) org.springframework.web.filter.delegatingfilterproxy.dofilter(delegatingfilterproxy.java:259)

this jsp want get:

   <table>         <tr>                     <th>user id</th>                     <th>module code</th>                     <th>module name</th>               </tr>          <c:foreach items="${setter}" var="obj" >         <c:foreach items="${obj.smodule}" var="module" >               <tr>                 <td><c:out value="${obj.userid}" escapexml="true" /></td>                   <td><c:out value="${module.modulecode}" escapexml="true" /></td>                 <td><c:out value="${module.modulename}" escapexml="true" /></td>                </tr>             </c:foreach>         </c:foreach>     </table>

i know how user , associated modules , without having hard code userid url. great.

checkout get method on session (documentation)

session.get(userentity.class, userid);

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