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I'm trying to use Fileupload.get() to upload an image from a detail-edit section of a web page
generated with the ZETA form builder,
which I have modified, trying to adapt the code found in the Fileupload example of the zkdemo application.
The page manages an "album" table, representing a collection of audio files.
The image is the cover image of the album.
In album.ZUL I have:
<button id="imageUpload" label="Upload" />
In AlbumControllerBase.java:
@Resource
protected Button imageUpload;
@Resource
protected Vbox image;
........
@EventHandler("imageUpload.onClick")
public void doImageUpload(Event event)
{
try
{
Media media = Fileupload.get();
if (media instanceof org.zkoss.image.Image)
{
org.zkoss.zul.Image image = new org.zkoss.zul.Image();
image.setContent((org.zkoss.image.Image)media);
image.setParent(this.image);
}
else if (media != null)
{
Messagebox.show("Not an image: " + media, "Error", Messagebox.OK, Messagebox.ERROR);
}
}
catch (InterruptedException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
When I press the image upload button, i get the following exception:
15-Apr-2009 11:02:50 org.zkoss.zk.ui.impl.UiEngineImpl handleError:1108 SEVERE: >>org.zkoss.zk.ui.SuspendNotAllowedException: Event processing thread is disabled >> at org.zkoss.zul.Window.doModal(Window.java:539) >> at org.zkoss.zul.Fileupload.get(Fileupload.java:335) >> at org.zkoss.zul.Fileupload.get(Fileupload.java:300) >> at org.zkoss.zul.Fileupload.get(Fileupload.java:233) >> at org.zkoss.zul.Fileupload.get(Fileupload.java:187) >>...
Should not be event processing thread enabled by default?
Anyway, I tried to manually enable the event thread by adding the following lines
at the beginning of the try block in the event handler method:
Desktop desktop = Executions.getCurrent().getDesktop(); desktop.getWebApp().getConfiguration().enableEventThread(true);
and i got the following exception instead:
15-Apr-2009 11:21:11 org.zkoss.zk.ui.impl.UiEngineImpl handleError:1108 SEVERE: >>org.zkoss.zk.ui.UiException: This method can be called only in an event listener, not in paging loading. >> at org.zkoss.zk.ui.impl.UiEngineImpl.wait(UiEngineImpl.java:1246) >> at org.zkoss.zk.ui.Executions.wait(Executions.java:347) >> at org.zkoss.zul.Window.enterModal(Window.java:619) >> at org.zkoss.zul.Window.doModal(Window.java:555) >> at org.zkoss.zul.Fileupload.get(Fileupload.java:335) >>...
hi,
The error seems occurred from
else if (media != null)
{
Messagebox.show("Not an image: " + media, "Error", Messagebox.OK, Messagebox.ERROR);
}
from the page,
http://docs.zkoss.org/wiki/Performance_tip#Use_the_Servlet_Thread_to_Process_Events
There are two options to solve this
1.Remove following setting from zk.xml(this will enable event processing threads)
<system-config>
<disable-event-thread/>
</system-config>
2.Overwrite the messagebox (following is just an example from the page)
Messagebox.show("Delete?", "Prompt", Messagebox.YES|Messagebox.NO,
Messagebox.QUESTION,
new EventListener() {
public void onEvent(Event evt) {
switch (((Integer)evt.getData()).intValue()) {
case Messagebox.YES: doYes(); break; //the Yes button is pressed
case Messagebox.NO: doNo(); break; //the No button is pressed
}
}
}
);
Hi hideokidd,
1) as you can see in the stacktrace, the exception occurred
from the doModal() method called by Fileupload.get().
2) I have no disable-event-thread element in my zk.xml file.
The file, automatically created by ZK Studio,
contains only an empty <zk></zk> root element.
So the event thread should be enabed by default.
3) when I enabled the event thread by code (see my previous message),
another exception was thrown, with message
"This method can be called only in an event listener, not in paging loading."
But the method from which I call Fileupload.get(), and indirecly do Modal(),
*is* an event listener, and is called in response to the button click event.
Hi,
Ok, that seems as a bug,
could you post it to zk bug with some description or sample code?
http://sourceforge.net/tracker/?group_id=152762&atid=785191
Thanks.
I've finally found a partially satifying solution.
I don't know if this one could be considered a bug, but surely can be considered something annoying.
The docs say that the doModal() method can only be called from inside an EventListener.
It is called by the FileUpload.get() method, which is called from the controller class.
In this case EventListener means a class registered as eventlistener in ZK configuration
(and this fact IMO should be clearly stated in doModal javadoc,
because the term 'EventListener' can easily lead to misunderstandings)
The Configuration.addListener() javadoc says:
"the listener class must implement at least one of Monitor, PerformanceMeter, EventThreadInit,
EventThreadCleanup, EventThreadSuspend, EventThreadResume, WebAppInit, WebAppCleanup, SessionInit,
SessionCleanup, DesktopInit, DesktopCleanup, ExecutionInit, ExecutionCleanup, URIInterceptor,
RequestInterceptor, UiLifeCycle, and/or EventInterceptor interfaces"
So, I declared an eventlistener in zk.xml:
<listener> <listener-class>artsite.album.AlbumController</listener-class> </listener>
and implemented the EventThreadInit interface (I choosed anyone of the listed interfaces)
in the AlbumController class, with empty interface methods
This way it works, but there is still a little problem (and maybe this is really a bug):
for a reason I can't figure out, the first time I press the 'Upload' button,
and the doModal method is called, the exception is still thrown and I see the message
"This method can be called only in an event listener, not in paging loading."
in a message box.
But the second time I click the button (and for all subsequent clicks),
the modal dialog appears correctly without exceptions.
Hi A,
I has declared an element in zk.xml:
<system-config>
<ui-factory-class>org.zkoss.spring.bean.ZkSpringUiFactory</ui-factory-class>
</system-config>
Servlet.service() for servlet zkLoader threw exception org.zkoss.zk.ui.UiException: Callable only in the event listener at org.zkoss.zk.ui.event.Events.sendEvent(Events.java:289) at org.zkoss.zk.ui.event.Events.sendEvent(Events.java:303) at org.zkoss.spring.config.ZkSpringBeanBindingComposer.bindController(ZkSpringBeanBindingComposer.java:123) at org.zkoss.spring.config.ZkSpringBeanBindingComposer.bindControllers(ZkSpringBeanBindingComposer.java:109) at org.zkoss.spring.config.ZkSpringBeanBindingComposer.bindComponent(ZkSpringBeanBindingComposer.java:92) at org.zkoss.spring.config.ZkSpringBeanBindingComposer.doAfterCompose(ZkSpringBeanBindingComposer.java:68) at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:637) at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:584) at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:528) at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:560) at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:528) at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:495) at org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage0(UiEngineImpl.java:375) at org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage(UiEngineImpl.java:296) at org.zkoss.zk.ui.http.DHtmlLayoutServlet.process(DHtmlLayoutServlet.java:229) at org.zkoss.zk.ui.http.DHtmlLayoutServlet.doGet(DHtmlLayoutServlet.java:166) at javax.servlet.http.HttpServlet.service(HttpServlet.java:617) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:378) at org.springframework.security.intercept.web.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:99) at org.springframework.security.intercept.web.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390) at org.springframework.security.intercept.web.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:109) at org.springframework.security.intercept.web.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390) at org.springframework.security.ui.SessionFixationProtectionFilter.doFilterHttp(SessionFixationProtectionFilter.java:67) at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390) at org.springframework.security.ui.ExceptionTranslationFilter.doFilterHttp(ExceptionTranslationFilter.java:101) at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390) at org.springframework.security.providers.anonymous.AnonymousProcessingFilter.doFilterHttp(AnonymousProcessingFilter.java:105) at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390) at org.springframework.security.ui.rememberme.RememberMeProcessingFilter.doFilterHttp(RememberMeProcessingFilter.java:116) at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390) at org.springframework.security.wrapper.SecurityContextHolderAwareRequestFilter.doFilterHttp(SecurityContextHolderAwareRequestFilter.java:91) at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390) at org.springframework.security.ui.basicauth.BasicProcessingFilter.doFilterHttp(BasicProcessingFilter.java:174) at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390) at org.springframework.security.ui.AbstractProcessingFilter.doFilterHttp(AbstractProcessingFilter.java:277) at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390) at org.springframework.security.ui.logout.LogoutFilter.doFilterHttp(LogoutFilter.java:89) at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390) at org.springframework.security.context.HttpSessionContextIntegrationFilter.doFilterHttp(HttpSessionContextIntegrationFilter.java:235) at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390) at org.springframework.security.util.FilterChainProxy.doFilter(FilterChainProxy.java:175) at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:236) at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Thread.java:619)
@anupriya,
you can upload file of any format using fileupload component. do you have any difficulty?
/robbie
Asked: 2009-04-15 09:36:27 +0800
Seen: 1,743 times
Last updated: Aug 10 '09
