DesktopUnavailableException

answered 2009-05-19 03:13:02 +0800

henrichen
3869 ● 2

Are you using server push? The most possible reason is that the desktop is already destroyed while the working thread still trying to activate it.

answered 2009-06-01 01:48:10 +0800

henrichen
3869 ● 2

No. That would jump too fast. Can you provide more information?

answered 2009-06-02 05:31:28 +0800

henrichen
3869 ● 2

Then, can you provide your zk.xml and web.xml? Will your application "invalidate" session without ZK's attention (asychronously)? Do you have timer in your zul?

answered 2009-06-03 01:22:32 +0800

henrichen
3869 ● 2

updated 2009-06-03 01:29:46 +0800

Per the stack trace:

1. A ZK event fired from browser, DhtmlUpdateServlet take over.
2. Get the desktop from the session
3. Then tried to lock the desktop and found it was already destroyed.

We suspect that between 2 and 3, the session is invalidate or the desktop is destroyed and
removed from the session asynchronously.

A possible scenario might be
a. A ZK event is handled and runs to step 2
b. Your framework logout function invalidate the session.

Since the possibility is low, "exactly wrong timing between 2 and 3" so it is rarely seen?

Regarding web.xml/zk.xml, I simply hope that might give some hints if I read them.

/henri

answered 2011-06-20 03:49:14 +0800

satya
9

updated 2011-06-20 03:49:38 +0800

Hi,

I am also facing the same issue in our production environment and it is happening frequently, can some one help me out in fixing the below issue:

[6/6/11 19:37:36:818 EST] 0000003b WebApp E [Servlet Error]-:
org.zkoss.zk.ui.DesktopUnavailableException: Unable to activate destroyed desktop, [Desktop
gpp9]
at org.zkoss.zk.ui.impl.UiEngineImpl.doActivate(UiEngineImpl.java:1534)
at org.zkoss.zk.ui.impl.UiEngineImpl.execUpdate(UiEngineImpl.java:968)
at org.zkoss.zk.au.http.DHtmlUpdateServlet.process(DHtmlUpdateServlet.java:480)
at org.zkoss.zk.au.http.DHtmlUpdateServlet.doGet(DHtmlUpdateServlet.java:370)
at org.zkoss.zk.au.http.DHtmlUpdateServlet.doPost(DHtmlUpdateServlet.java:379)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1146)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:593)
at com.ibm.ws.wswebcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:534)

please let me know the reason why the issue comes?

Thanks,
Satya.

answered 2012-02-16 20:04:31 +0800

mone855
3

Hi Henri,

org.zkoss.zk.ui.DesktopUnavailableException: Unable to activate destroyed desktop, [Desktop gqe91]

I am getting this error once in a while in the production. Our Web application developed on ZK and is deployed in WAS 6.1.0.33.

I read ur previous answere

1. A ZK event fired from browser, DhtmlUpdateServlet take over.
2. Get the desktop from the session
3. Then tried to lock the desktop and found it was already destroyed.

We suspect that between 2 and 3, the session is invalidate or the desktop is destroyed and
removed from the session asynchronously.

Can u please explain bit regarding this
wht does it mean locking the desktop and is destroyed and is removed from the session asynchronously.
And wht might be causing this desktop destroy :-
communication issue/delay in server response/multiple browsers opened by the same user/browser settings (IE7)/DNS-firewall settings etc..

we are getting this now in production, expecting answer ASAP.

Thanks
Mone