I suppose I need to learn more about how Spring support is implemented in
Wicket. My thinking was that the injected property would simply get set to
null. Then the getter for that injected property can perform a null check and
lazily initialize it with a default type if necessary:
@SpringBean(name = "someService")
private Service service;
public Service getService() {
if (service == null) {
service = new DefaultService();
}
return service;
}
This allows for default implementation to be provided that can then be
overridden by declaring the bean in Spring. I've used this type of pattern with
Spring in other settings and thought it might be useful in Wicket too.
________________________________
From: Igor Vaynberg [mailto:[EMAIL PROTECTED]
Sent: Wed 3/19/2008 5:49 PM
To: [email protected]
Subject: Re: Suggested Enhancement To Spring Support
you want to swallow the exception?
then you would return a null into a proxy and cause an npe later...
-igor
On Wed, Mar 19, 2008 at 1:43 PM, Zappaterrini, Larry
<[EMAIL PROTECTED]> wrote:
> It might be a nice improvement to Wicket's Spring support to allow for
> missing bean definitions to be handled gracefully. This would allow for
> the use of a sane default in the absence of explicit declaration in the
> context XML. Right now using the Spring annotations support I get the
> following error when I don't define the object in the XML:
>
> org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean
> named 'beanName' is defined
> at
> org.springframework.beans.factory.support.DefaultListableBeanFactory.get
> BeanDefinition(DefaultListableBeanFactory.java:355)
> at
> org.springframework.beans.factory.support.AbstractBeanFactory.getMergedB
> eanDefinition(AbstractBeanFactory.java:800)
> at
> org.springframework.beans.factory.support.AbstractBeanFactory.isSingleto
> n(AbstractBeanFactory.java:343)
> at
> org.springframework.context.support.AbstractApplicationContext.isSinglet
> on(AbstractApplicationContext.java:654)
> at
> org.apache.wicket.spring.SpringBeanLocator.isSingletonBean(SpringBeanLoc
> ator.java:133)
> at
> org.apache.wicket.spring.injection.annot.AnnotProxyFieldValueFactory.get
> FieldValue(AnnotProxyFieldValueFactory.java:91)
> at org.apache.wicket.injection.Injector.inject(Injector.java:108)
> at
> org.apache.wicket.injection.ConfigurableInjector.inject(ConfigurableInje
> ctor.java:39)
> at
> org.apache.wicket.injection.ComponentInjector.onInstantiation(ComponentI
> njector.java:52)
> at
> org.apache.wicket.Application.notifyComponentInstantiationListeners(Appl
> ication.java:973)
> at org.apache.wicket.Component.<init>(Component.java:866)
>
> ... truncated for brevity
>
> Using getSpringContext().contains(String) either within or as an exposed
> method of SpringBeanLocator would probably be sufficient to avoid
> hitting this exception.
>
> Thanks,
> Larry
>
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