I read on the wiki that serializing spring beans is a problem because
of injected references. So what I want is something from spring which
it probably cannot give me. But I will try to clear this up on the
spring forum.
2007/6/7, Igor Vaynberg <[EMAIL PROTECTED]>:
> hrm. you say you will have a serialization problem if you lookup the bean
> directly and hold on to it. but isnt that exactly what you want? to pull out
> a prototype bean and keep it inside the form's scope? the form is in
> httpsession and so the bean will be serialized. so if that is what you want
> to do you have to make sure the bean is serializable and do the lookup
> yourself.
>
> we can probably add @SpringBean(transient=false) or something like that to
> keep the reference instead of discarding it, but that wont solve your
> serialization problem, it will just save you doing the lookup yourself.
>
> so what exactly do you want?
>
> -igor
>
> On 6/3/07, Rüdiger Schulz <[EMAIL PROTECTED]> wrote:
> >
> > I put a breakpoint in the constructor of my Form, which has the
> > @SpringBean annotation on ia property named logic.
> >
> > Before the super() call, logic is null.
> >
> > After that, it is set to $Proxy39, with a h-attribute to a
> > org.apache.wicket.proxy.LazyInitProxyFactory$JdkHandler. The target
> > property of the handler is null.
> >
> > After the next line, where I call a method from logic, the target
> > property is set to the bean instance.
> >
> > So it seems that the reference gets lost in the first call.
> >
> >
> > But, as you said that the bean is transient anyway, I think that
> > prototype beans could not be used that way for holding state of wicket
> > components, because that state should certainly also be kept when
> > using the back button.
> >
> > I'm not sure what is best then. I could get a reference to the spring
> > bean directly from ApplicationContext, and just keep it. But then I
> > would face the problem of serialization.
> >
> > The best thing would be IMHO if the proxy could somehow do an
> > automatic re-lookup from Spring for prototype beans, so that not a new
> > instance is fetched from the container, but the same as before. But I
> > don't know enough about Spring to say if that is even possible.
> >
> >
> >
> > 2007/6/3, Eelco Hillenius <[EMAIL PROTECTED]>:
> > > I'm not that familiar with the code, but the interesting thing is that
> > > LazyInitProxyFactory$JdkHandler does cache the bean it located:
> > >
> > > if (target == null)
> > > {
> > > target = locator.locateProxyTarget();
> > > }
> > > return proxy.invoke(target, args);
> > >
> > > The target is a transient member of JdkHandler and judging from the
> > > code, once the bean is located it should just be reused until the page
> > > is serialized/ deserialized (for backbutton support or when
> > > clustered).
> > >
> > > Can you use you debugger to find out what exactly happens?
> > >
> > > Eelco
> > >
> > > On 6/1/07, Rüdiger Schulz <[EMAIL PROTECTED]> wrote:
> > > > Right, forgot the Stacktraces:
> > > >
> > > > The first when calling super():
> > > > at KitManagementBean.<init>(KitManagementBean.java:34)
> > > > at
> sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
> > Method)
> > > > at sun.reflect.NativeConstructorAccessorImpl.newInstance(
> > NativeConstructorAccessorImpl.java:39)
> > > > at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(
> > DelegatingConstructorAccessorImpl.java:27)
> > > > at java.lang.reflect.Constructor.newInstance(Constructor.java
> > :513)
> > > > at org.springframework.beans.BeanUtils.instantiateClass(
> > BeanUtils.java:85)
> > > > at
> >
> org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate
> > (SimpleInstantiationStrategy.java:61)
> > > > at
> >
> org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean
> > (AbstractAutowireCapableBeanFactory.java:732)
> > > > at
> >
> org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance
> > (AbstractAutowireCapableBeanFactory.java:720)
> > > > at
> >
> org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean
> > (AbstractAutowireCapableBeanFactory.java:386)
> > > > at
> > org.springframework.beans.factory.support.AbstractBeanFactory.getBean(
> > AbstractBeanFactory.java:270)
> > > > at
> > org.springframework.beans.factory.support.AbstractBeanFactory.getBean(
> > AbstractBeanFactory.java:164)
> > > > at
> > org.springframework.context.support.AbstractApplicationContext.getBean(
> > AbstractApplicationContext.java:707)
> > > > at org.apache.wicket.spring.SpringBeanLocator.lookupSpringBean
> > (SpringBeanLocator.java:240)
> > > > at
> > org.apache.wicket.spring.SpringBeanLocator.locateProxyTarget(
> > SpringBeanLocator.java:163)
> > > > at
> >
> org.apache.wicket.spring.injection.annot.AnnotProxyFieldValueFactory.testLocator
> > (AnnotProxyFieldValueFactory.java:124)
> > > > at
> >
> org.apache.wicket.spring.injection.annot.AnnotProxyFieldValueFactory.getFieldValue
> > (AnnotProxyFieldValueFactory.java:99)
> > > > at org.apache.wicket.injection.Injector.inject(Injector.java
> > :109)
> > > > at org.apache.wicket.injection.ConfigurableInjector.inject(
> > ConfigurableInjector.java:40)
> > > > at
> > org.apache.wicket.injection.ComponentInjector.onInstantiation(
> > ComponentInjector.java:54)
> > > > at
> > org.apache.wicket.Application.notifyComponentInstantiationListeners(
> > Application.java:916)
> > > > at org.apache.wicket.Component.<init>(Component.java:708)
> > > > at org.apache.wicket.MarkupContainer.<init>(
> > MarkupContainer.java:111)
> > > > at org.apache.wicket.markup.html.WebMarkupContainer.<init>(
> > WebMarkupContainer.java:39)
> > > > at org.apache.wicket.markup.html.form.Form.<init>(Form.java
> > :233)
> > > > at KitForm.<init>(KitForm.java:50)
> > > > at KitEditPage.<init>(KitEditPage.java:45)
> > > >
> > > > And from the next line, where I call a method on the bean:
> > > >
> > > > at KitManagementBean.<init>(KitManagementBean.java:34)
> > > > at
> sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
> > Method)
> > > > at sun.reflect.NativeConstructorAccessorImpl.newInstance(
> > NativeConstructorAccessorImpl.java:39)
> > > > at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(
> > DelegatingConstructorAccessorImpl.java:27)
> > > > at java.lang.reflect.Constructor.newInstance(Constructor.java
> > :513)
> > > > at org.springframework.beans.BeanUtils.instantiateClass(
> > BeanUtils.java:85)
> > > > at
> >
> org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate
> > (SimpleInstantiationStrategy.java:61)
> > > > at
> >
> org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean
> > (AbstractAutowireCapableBeanFactory.java:732)
> > > > at
> >
> org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance
> > (AbstractAutowireCapableBeanFactory.java:720)
> > > > at
> >
> org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean
> > (AbstractAutowireCapableBeanFactory.java:386)
> > > > at
> > org.springframework.beans.factory.support.AbstractBeanFactory.getBean(
> > AbstractBeanFactory.java:270)
> > > > at
> > org.springframework.beans.factory.support.AbstractBeanFactory.getBean(
> > AbstractBeanFactory.java:164)
> > > > at
> > org.springframework.context.support.AbstractApplicationContext.getBean(
> > AbstractApplicationContext.java:707)
> > > > at org.apache.wicket.spring.SpringBeanLocator.lookupSpringBean
> > (SpringBeanLocator.java:240)
> > > > at
> > org.apache.wicket.spring.SpringBeanLocator.locateProxyTarget(
> > SpringBeanLocator.java:163)
> > > > at
> > org.apache.wicket.proxy.LazyInitProxyFactory$JdkHandler.invoke(
> > LazyInitProxyFactory.java:389)
> > > > at org.apache.wicket.proxy.$Proxy39.init(Unknown Source)
> > > > at KitForm.<init>(KitForm.java:51)
> > > > at KitEditPage.<init>(KitEditPage.java:45)
> > > >
> > > >
> > > > 2007/6/1, Rüdiger Schulz <[EMAIL PROTECTED]>:
> > > > > Hello everybody,
> > > > >
> > > > > I already tried to chat on ##wicket about this, but it's probably
> > too
> > > > > complex for IRC...
> > > > >
> > > > > I'm using Wicket 1.3.0 snapshot and Spring 2.0 on JDK6 / Jetty. For
> > a
> > > > > more complex form I wanted to use a "stateful" Springbean, to which
> > I
> > > > > applied scope="prototype". The idea is to have one bean instance for
> > > > > every Form instance. I would access the bean with PropertyModels and
> > > > > direct method calls during construction (i.e. setting initial state
> > > > > from input parameters) and during events, which would alter the
> > state.
> > > > > I inject the bean into the Form with @SpringBean annotation.
> > > > >
> > > > > This works somehow, but sometimes, especially after using the
> > > > > backbutton, I had the problem that the internal state was reset. So
> > I
> > > > > analyzed the stack in the constructor of the bean implementation,
> > and
> > > > > found out that it was called twice during construction of the Form.
> > > > > First, during the super() call, and then again in the next line
> > during
> > > > > a method call on that bean. I appended both stacktraces below. The
> > > > > proxy itself does not change.
> > > > >
> > > > > This happens again after going back and e.g. submitting again. This
> > > > > results in a NPE, because the internal state is reset.
> > > > >
> > > > > I understand from reading the mailing list that the Wicket-Proxy
> > does
> > > > > nothing but a lookup in the Application context, and does not know
> > or
> > > > > care about spring scope.
> > > > >
> > > > > And here I'm a little stuck. I am already considering to put the
> > state
> > > > > into the Form, and make the Bean a singleton without any internal
> > > > > state. As that would mean some heavy refactoring, I would prefer a
> > way
> > > > > where the Spring acces would work as I want. Or is this a wrong way
> > > > > altogether?
> > > > >
> > > > > thanks in advance for any comments.
> > > > >
> > > > > --
> > > > > greetings from Berlin,
> > > > >
> > > > > Rüdiger Schulz
> > > > >
> > > > > www.2rue.de
> > > > >
> > > >
> > > >
> > > > --
> > > > greetings from Berlin,
> > > >
> > > > Rüdiger Schulz
> > > >
> > > > www.2rue.de
> > > >
> > > >
> > -------------------------------------------------------------------------
> > > > This SF.net email is sponsored by DB2 Express
> > > > Download DB2 Express C - the FREE version of DB2 express and take
> > > > control of your XML. No limits. Just data. Click to get it now.
> > > > http://sourceforge.net/powerbar/db2/
> > > > _______________________________________________
> > > > Wicket-user mailing list
> > > > Wicket-user@lists.sourceforge.net
> > > > https://lists.sourceforge.net/lists/listinfo/wicket-user
> > > >
> > >
> > >
> > -------------------------------------------------------------------------
> > > This SF.net email is sponsored by DB2 Express
> > > Download DB2 Express C - the FREE version of DB2 express and take
> > > control of your XML. No limits. Just data. Click to get it now.
> > > http://sourceforge.net/powerbar/db2/
> > > _______________________________________________
> > > Wicket-user mailing list
> > > Wicket-user@lists.sourceforge.net
> > > https://lists.sourceforge.net/lists/listinfo/wicket-user
> > >
> >
> >
> > --
> > greetings from Berlin,
> >
> > Rüdiger Schulz
> >
> > www.2rue.de
> >
> > -------------------------------------------------------------------------
> > This SF.net email is sponsored by DB2 Express
> > Download DB2 Express C - the FREE version of DB2 express and take
> > control of your XML. No limits. Just data. Click to get it now.
> > http://sourceforge.net/powerbar/db2/
> > _______________________________________________
> > Wicket-user mailing list
> > Wicket-user@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/wicket-user
> >
>
--
greetings from Berlin,
Rüdiger Schulz
www.2rue.de
-------------------------------------------------------------------------
This SF.net email is sponsored by DB2 Express
Download DB2 Express C - the FREE version of DB2 express and take
control of your XML. No limits. Just data. Click to get it now.
http://sourceforge.net/powerbar/db2/
_______________________________________________
Wicket-user mailing list
Wicket-user@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/wicket-user
