Hello,
I'm having some errors while doing a stress testing on my application. If I
make a single request it works fine. Even if I make a single request and after
that do the stress test, it works fine. The problem occurs when doing the
stress test on a just started server.
For the stress test I'm using WebLOAD to make requests to the same URL during 5
minutes, beginning with 5 concurrent users until 500 concurrent users. The
problem is arising at the very beginning of the test.
I have wrapped the Application object in order to do additional processing
when creating a composite component of my own:
public class BKSApplication extends ApplicationWrapper {
/** Component type for views */
private static final String COMPONENT_TYPE_VIEW = "rigel.faces.View";
private volatile Application wrapped;
public BKSApplication(Application application) {
super();
wrapped = application;
}
[...]
@Override
public UIComponent createComponent(FacesContext context, Resource
componentResource) {
UIComponent comp = wrapped.createComponent(context,
componentResource);
// get componentType
BeanInfo info = (BeanInfo)
comp.getAttributes().get(UIComponent.BEANINFO_KEY);
String compType = (String) ((ValueExpression)
info.getBeanDescriptor().getValue(UIComponent.COMPOSITE_COMPONENT_TYPE_KEY)).getValue(context.getELContext());
if (COMPONENT_TYPE_VIEW.equals(compType)) {
UIView uiView = (UIView) comp;
// do some processing with UIView
[...]
}
return comp;
}
}
In my faces-config.xml, I have associated "rigel.faces.View" with my own
component class:
<?xml version="1.0"?>
<faces-config xmlns="http://java.sun.com/xml/ns/javaee";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd";
version="2.0">
<factory>
<application-factory>com.isb.rigel.srvcimpl.presentation.faces.application.BKSApplicationFactoryImpl</application-factory>
</factory>
<component>
<component-type>rigel.faces.View</component-type>
<component-class>com.isb.rigel.srvcimpl.presentation.faces.component.view.UIView</component-class>
</component>
</faces-config>
So the above code should always return an instance of UIView when the component
type is "rigel.faces.View". But when doing stress test I get a
ClassCastException:
java.lang.ClassCastException: javax.faces.component.UINamingContainer
incompatible with
com.isb.rigel.srvcimpl.presentation.faces.component.view.UIView
at
com.isb.rigel.srvcimpl.presentation.faces.application.BKSApplication.createComponent(BKSApplication.java:124)
at
org.apache.myfaces.view.facelets.tag.composite.CompositeComponentResourceTagHandler.createComponent(CompositeComponentResourceTagHandler.java:108)
at
org.apache.myfaces.view.facelets.tag.jsf.ComponentTagHandlerDelegate.createComponent(ComponentTagHandlerDelegate.java:497)
at
org.apache.myfaces.view.facelets.tag.jsf.ComponentTagHandlerDelegate.apply(ComponentTagHandlerDelegate.java:263)
...
This error should never happen, but it is happening only when doing a stress
test.
Just to check if there is a synchronization problem I have synchronized the
call to Application.createComponent, this way:
@Override
public UIComponent createComponent(FacesContext context, Resource
componentResource) {
UIComponent comp = null;
synchronized (this) {
comp = wrapped.createComponent(context, componentResource);
}
// get componentType
BeanInfo info = (BeanInfo)
comp.getAttributes().get(UIComponent.BEANINFO_KEY);
String compType = (String) ((ValueExpression)
info.getBeanDescriptor().getValue(UIComponent.COMPOSITE_COMPONENT_TYPE_KEY)).getValue(context.getELContext());
if (COMPONENT_TYPE_VIEW.equals(compType)) {
UIView uiView = (UIView) comp;
// do some processing with UIView
[...]
}
return comp;
}
When this call is synchronized the error is never happening at all, even doing
a stress test it works fine.
So I think there is a synchronization problem when several threads call, at the
same time, the method Application.createComponent(FacesContext context,
Resource componentResource)
Greetings,
Jesús Pérez Alcaide
Lab. Banksphere - Runtime
Tlf: 91 470 5223
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