JSF 2.2 java.lang.IllegalStateException: Cannot create a session after the response has been committed -

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i've developed web apps using jsf 2.0 , decided write app using myfaces 2.2 , tomcat 7.0.35. exceptions , can't understand reason of this. khow stacktrace similar mojara bug use myfaces.

java.lang.illegalstateexception: cannot create session after response has been committed     org.apache.catalina.connector.request.dogetsession(request.java:2881)     org.apache.catalina.connector.request.getsession(request.java:2316)     org.apache.catalina.connector.requestfacade.getsession(requestfacade.java:898)     org.apache.myfaces.context.servlet.servletexternalcontextimpl.getsession(servletexternalcontextimpl.java:150)     org.apache.myfaces.view.impl.defaultviewscopehandler.generateviewscopeid(defaultviewscopehandler.java:128)     org.apache.myfaces.view.viewscopeproxymap.getwrapped(viewscopeproxymap.java:76)     org.apache.myfaces.view.viewscopeproxymap.isempty(viewscopeproxymap.java:94)     org.apache.myfaces.renderkit.errorpagewriter._writevariables(errorpagewriter.java:787)     org.apache.myfaces.renderkit.errorpagewriter._writevariables(errorpagewriter.java:769)     org.apache.myfaces.renderkit.errorpagewriter.debughtml(errorpagewriter.java:356)     org.apache.myfaces.renderkit.errorpagewriter.handle(errorpagewriter.java:470)     org.apache.myfaces.context.myfacesexceptionhandlerwrapperimpl.handle(myfacesexceptionhandlerwrapperimpl.java:301)     javax.faces.context.exceptionhandlerwrapper.handle(exceptionhandlerwrapper.java:61)     org.apache.myfaces.lifecycle.lifecycleimpl.render(lifecycleimpl.java:287)     javax.faces.webapp.facesservlet.service(facesservlet.java:200)

it's page

<h:body>     <h:inputtext value="#{loginbean.username}"/>     <h:inputsecret value="#{loginbean.password}"/>     <h:commandbutton value="login"/>         <!-- jquery (necessary bootstrap's javascript plugins) -->     <script src="http://code.jquery.com/jquery-latest.min.js" type="text/javascript"></script>     <h:outputscript name="lib/bootstrap.min.js" library="js" target="body"/> </h:body>  @managedbean(name = "loginbean") @requestscoped public class loginbean implements serializable{      private string username;     private string password;      @postconstruct     public void init(){         username = "";         password = "";     }      public void validatecredentials(){      }      public string getusername() {         return username;     }      public void setusername(string username) {         this.username = username;     }      public string getpassword() {         return password;     }      public void setpassword(string password) {         this.password = password;     } }

what can reason of problem?

try add:

<h:form rendered="#{loginbean.initok}">    <h:inputtext value="#{loginbean.username}"/>    <h:inputsecret value="#{loginbean.password}"/>    <h:commandbutton value="login"/>       ............   <h:from>  @managedbean(name = "loginbean") @requestscoped public class loginbean implements serializable{   private string username;  private string password;  private boolean initok;   @postconstruct public void init(){     username = "";     password = "";     initok =true; }  getter setter...

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