Unconscious use WebServices session

-
Real life ... programmer copied the definition of service in Service1WS to Service2WS, changed the name of the service, the name of the class and obtained a description of the service:

<service name="Service2WS" provider="java:RPC" use="literal"> <parameter name="className" value="myapp.Service2WS" /> <parameter name="allowedMethods" value="*" /> <parameter name="scope" value="Session" /> </service>
He did not notice, however, that Service1WS contains a parameter that if Service2WS should not appear to have been:

<parameter name="scope" value="Session" />
The result was that when the server traffic appeared to increase there was java.lang.OutOfMemoryError: Java heap space. The increases in traffic were no frequent so error occurred sporadically (sic!).

During the tracking error, no one came up with the idea to look on cardinality of the Tomcat session (there are lots of them in heavy traffic). Only application profiling revealed that there are a lot of objects Axis'a session is indicated clue: enough to look at the number of sessions on Tomcat'cie, look for deploy.wsdd with the description Service2WS parameter, and see this thing was clear.

Why were so many sessions for one client WS and one server WS. The explanation is simple, Service2WS session was so involved sessions for each request to the URL or cookie does not transfer any jsessionid = SES_ID, and that the client Service2WS do not send this parameter (because the intended use of the no session services), each request assumed a new session. Even though each such session expire after 8 hours, it's still under heavy traffic arose so many objects session that could fullfill, or at any rate limited space Heap.

The proposal, still the same, carefully copying the code.

Komentarze

Prześlij komentarz

Popularne posty z tego bloga

Java ESL program for connecting to the FreeSWITCH

-
Next simple Java program using Event Socket interface to control FreeSWITCH. First you should read: Mod event socket on wiki freeswitch Java ESL Client on wiki freeswitch Next you should not forget to change event_socket.conf.xml (to allow connections from any host on the network): Now we can write simple java ESL program for connecting to the FreeSWITCH. MyEslEventListener.java package myeslevent; import java.util.Map; import java.util.Set; import org.freeswitch.esl.client.IEslEventListener; import org.freeswitch.esl.client.transport.event.EslEvent; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class MyEslEventListener implements IEslEventListener { private final Logger log = LoggerFactory.getLogger(this.getClass()); @Override public void eventReceived(EslEvent event) { log.info("eventReceived [{}]\n[{}]\n", event, getEventToLog(event)); } @Override public void backgroundJobResultReceived(EslEve
Czytaj więcej

AngularJS example MotoAds more advanced than the tutorial on angularjs.org

-
Obraz
I have just been learning AngularJS and decided to build demo application that cover more techniques than the tutorial on angularjs.org . This application is only demo so it do not have complete server side, some features have the todos and there is not any test. This demo application is some kind of automotive adverts portal, so I called it MotoAds. It has two main features: List of adverts – includes an advanced filtering and sorting. Add advert – a form with some client side field validations. MotoAds application looks like this: Application folders tree: Root file index.html included external resource: bootstrap.css (2.3.2) angular.js, angular-resource.js (1.0.8) ui-bootstrap-tpls-0.6.0.js (0.6.0) and internal resource: app.css app.js services.js controllers.js Bootstrap angular application, add navigation and route templates In index.html we auto-bootstrap the angular application by defining directive ng-app : In app.js we define new
Czytaj więcej

Java program for connecting to the FreeSWITCH XML-RPC

-
I would like to show simple Java program which use XML-RPC interface to do some freeswitch commands. We should on freeswitch console load mod_xml_rpc: Worth checking out if it works, in web browser type: http://fshost8080/webapi/help If you see "FreeSWITCH help" it works. Next we download Apache XML-RPC library. Now we create Java program (using Apache XML-RPC): package fstest1; import java.net.URL; import java.util.Scanner; import org.apache.xmlrpc.client.XmlRpcClient; import org.apache.xmlrpc.client.XmlRpcClientConfigImpl; public class FsTest1 { public static void main(String[] args) { System.out.println("------ hello freeswitch -------\n"); XmlRpcClientConfigImpl config = new XmlRpcClientConfigImpl(); XmlRpcClient client = new XmlRpcClient(); try { config.setServerURL(new URL("http://fshost:8080/RPC2")); config.setBasicUserName("freeswitch"); config.setBasicPassword("works");
Czytaj więcej