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Browser refresh issue [message #748218]

Mon, 24 October 2011 15:08

DANIEL

Messages: 13
Registered: November 2010

Junior Member

We are trying to get control when the user refresh the browser and not when the session is about to be destroyed but could not find away to accomplish that. Here's what we are doing:

Our initial dialog is a login dialog, where the user types his credentials and then we open a private socket to our server which we communicate with. Don't get confused as this is a non-web server and it has nothing to do with RAP. We want the user to remain connected to our server and not to display the login dialog when the user refresh the browser.

The first step was to keep all session singleton instances in the http session instead of the RAP context session store, in order to keep the data available after refresh was pressed. In brief we changed the RAP code "SessionSingletonBase.getInstance(clazz)" to "RWT.getSessionStore().getHttpSession().setAttribute(clazz.getName(), object)". This change worked successfully and all of our session singleton objects are now available/kept after the refresh.

In addition we set up a listener using org.eclipse.rwt.service.SessionStoreListener and get control in the method "beforeDestroy". We would like to close our private socket that we opened with our private server during login, when the session is destroyed. But unfortunately, the beforeDestroy method gives control also when a refresh was pressed and we don't want to close our socket in this case.

Any idea how we can get control when the session is destroyed and not when a refresh was pressed? Again, we want to close our private socket only during a real destroy.

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Re: Browser refresh issue [message #749448 is a reply to message #748218]

Tue, 25 October 2011 08:17

Ralf Sternberg

Messages: 1313
Registered: July 2009

Senior Member

Hi Daniel,

I don't fully understand your case but couldn't you register an
HttpSessionListener? The HttpSession remains untouched on browser
refresh, so you'd receive a sessionDestroyed only when the servlet
container times out the session. Note that this event occurs *before*
RAP cleans up the session, so you must not do anything that would
interfere with this cleanup.

Regards, Ralf

--
Ralf Sternberg

Twitter: @EclipseRAP
Blog: http://eclipsesource.com/blogs/

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Re: Browser refresh issue [message #753573 is a reply to message #749448]

Thu, 27 October 2011 20:07

DANIEL Missing name

Messages: 12
Registered: July 2011
Location: TORONTO

Junior Member

That is what I initially tried but it did not work. Here is step by step what I did -

I added the following lines to my web.xml in the war file.

<listener>
   <listener-class>my.package.name.UIHttpSessionListener</listener-class>
</listener>

And created the class in one of the plug-ins (not fragment).

public class UIHttpSessionListener implements HttpSessionListener 
{....

When I start Tomcat I get the error message below.

27-Oct-2011 3:56:18 PM org.apache.catalina.core.StandardContext start
SEVERE: Error listenerStart
27-Oct-2011 3:56:18 PM org.apache.catalina.core.StandardContext start
SEVERE: Context [/myappl] startup failed due to previous errors

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Re: Browser refresh issue [message #753574 is a reply to message #749448]

Thu, 27 October 2011 20:07

DANIEL

Messages: 13
Registered: November 2010

Junior Member

That is what I initially tried but it did not work. Here is step by step what I did -

I added the following lines to my web.xml in the war file.

<listener>
<listener-class>my.package.name.UIHttpSessionListener</listener-class>
</listener>

And created the class in one of the plug-ins (not fragment).

public class UIHttpSessionListener implements HttpSessionListener
{....

When I start Tomcat I get the error message below.

27-Oct-2011 3:56:18 PM org.apache.catalina.core.StandardContext start
SEVERE: Error listenerStart
27-Oct-2011 3:56:18 PM org.apache.catalina.core.StandardContext start
SEVERE: Context [/myappl] startup failed due to previous errors

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Re: Browser refresh issue [message #753575 is a reply to message #753573]

Thu, 27 October 2011 20:12

DANIEL Missing name

Messages: 12
Registered: July 2011
Location: TORONTO

Junior Member

Here is the full error message. I guess my http listener class was not found. Any idea why?

SEVERE: Error configuring application listener of class my.package.UIHttpSessionListener
java.lang.ClassNotFoundException: my.package.UIHttpSessionListener
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1647)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1493)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4115)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4671)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:799)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:779)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:546)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:905)
at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:740)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:500)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1277)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:321)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1061)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
at org.apache.catalina.core.StandardService.start(StandardService.java:525)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:701)
at org.apache.catalina.startup.Catalina.start(Catalina.java:585)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)

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