Use of request.getSession(false) in TagLib of Grails throws exception -

i trying use below code in taglib of grails 2.3.5.

class logintaglib {    def logincontrol = {   if(request.getsession(false) && session.user){     out << "hello ${session.user.login} "     out << """[${link(action:"logout",controller:"user"){"logout"}}]""" }  else {     out << """[${link(action:"login",     controller:"user"){"login"}}]""" } } 

}

i getting following error:

groovy.lang.missingmethodexception: no signature of method: org.apache.catalina.connector.requestfacade.session() applicable argument types: (java.lang.boolean) values: [false] possible solutions: getsession(boolean), getsession()     racetrack.logintaglib$_closure1.docall(logintaglib.groovy:9)     d__java_grails_workspace_racetrack_grails_app_views_layouts__header_gsp.run(_header.gsp:7)     d__java_grails_workspace_racetrack_grails_app_views_layouts_main_gsp$_run_closure2.docall(main.gsp:22)     d__java_grails_workspace_racetrack_grails_app_views_layouts_main_gsp.run(main.gsp:25)     java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1145)     java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:615)     java.lang.thread.run(thread.java:724) 

try instead

def user = session?.user  if (user) {     out << "hello ${session.user.login} "     out << """[${link(action:"logout",controller:"user"){"logout"}}]""" }