java - spring singleton object state -


here have 1 doubt spring singleton object.

spring create atleast 1 object per bean definition depending on scope. singleton scope, 1 object per bean definiton.

as spring context provide singleton instance why not able share same session of it.

the below code give error:

throw null pointer error. org.hibernate.transactionexception: transaction not started

while trying access same instance session. session instance null.

in main method

public static void main(string[] args) {   testdao dao =  (testdao) applicationcontext.getinstance().getbean(daotype.testdao.tostring());   dao.startoperation();   for(test test:testlist)   {      saveisbean(test,true)   }   dao.endoperation(); }

this method save data if session open reuse it. 

private void saveisbean(isbean isbean,boolean issessionalreadyopen) throws ntexception  {  testdao dao =  (testdao) applicationcontext.getinstance().getbean(daotype.testdao.tostring());   if(issessionalreadyopen)  {  //dao.startoperation(); if start session again works.  dao.getsession().saveorupdate(isbean); //throw null pointer error. org.hibernate.transactionexception: transaction not started   }  else  {  dao.saveorupdate(isbean);   }  }  public void startoperation() throws hibernateexception {  session = hibernatefactory.opensession();  transaction = session.begintransaction();  }

if start session again or pass same session instance in method works fine not understand why not work. singleton instance not have same state in spring context!!

thanks in advance

to use spring must bootstrap depenedency injection container. container can point xml file defining beans or class using springs java configuration. once container bootstrapped manages of beans singletons. code provided uses static method on applicationcontext class never has actual handle instance of applicationcontext meaning no beans defined within it.

here example of bootstrapping via xml:

// create , configure beans applicationcontext context =     new classpathxmlapplicationcontext(new string[] {"services.xml", "daos.xml"});

Comments

Post a Comment

Popular posts from this blog

curl - PHP fsockopen help required -

i trying work on cloudflare api , have found in documentation. unfortunately have no idea how can use in fsockopen or through curl. here example of post request. need know how can make request below data post using curl or fsockopen curl https://www.cloudflare.com/api_json.html -d 'a=cache_lvl' \ -d 'tkn=8afbe6dea02407989af4dd4c97bb6e25' \ -d 'email=sample@example.com' \ -d 'z=example.com' \ -d 'v=agg' here link cloudflare https://www.cloudflare.com/docs/client-api.html#s4.2 try one: $ch = curl_init("https://www.cloudflare.com/api_json.html"); curl_setopt($ch, curlopt_returntransfer,1); curl_setopt($ch, curlopt_followlocation, 1); curl_setopt($ch, curlopt_ssl_verifypeer,false); // handling of -d curl parameter here. $param = array( 'a' => 'cache_lvl', 'tkn' => '8afbe6dea02407989af4dd4c97bb6e25', 'email' => 'sample@example.com', 'z' =...
Read more

HTTP/1.0 407 Proxy Authentication Required PHP -

i working in restricted network/limited access internet. since have use proxy make web service call. here php code calling web service , response . $client = new soapclient("http: //www.xyz.com/abc/wsdls/login.wsdl", array("trace" => 1, "exceptions" => 1, 'proxy_host' => $proxy_host, 'proxy_port' => $proxy_port, 'proxy_login' => $proxy_login, 'proxy_password' => $proxy_password)); response is fatal error: uncaught soapfault exception: [wsdl] soap-error: parsing wsdl: couldn't load ' http://www.xyz.com/abc/wsdls/login.wsdl ' : failed load external entity if copy url error message , paste in browser(with same proxy settings) works. 2nd scenario is, if pass values instead of variables giving me diffarant response $client = new soapclient("http: //www.xyz.com/abc/wsdls/login.wsdl", array("trace" => 1, "exceptions" => 1, 'proxy_host' ...
Read more

c# - Resource not found error -

i have problem accessing method on homecontroller. show code of method : [httpget] public actionresult decriptidentifiantetredirige(string login_crypter, string mdp_crypter) { string loginacrypter = _globalmanager.protegemotdepasse(login_crypter); string mdpacrypter = _globalmanager.protegemotdepasse(mdp_crypter); user userapp = new models.user(login_crypter, mdp_crypter); if (userapp.authentificationvalidee(userapp.userlogin, userapp.password)) { session["name"] = userapp.userlogin; return redirecttoaction("accueil", "home"); } else { return redirecttoaction("validerauthentification", "home"); } } then in routeconfig.cs wrote route : routes.maproute( name: "authentificationapresdecryptage", url: "{controller}/{action}/{login_crypter}/{mdp_crypter}", defaults: new...
Read more