Re: [Wicket-user] Wicket requiring one of my Spring managed beans to have a default constructor
Not directly related to your question, but you might like to know that
the name property of @SpringBean defaults to your field name, so you
could have written it like this...
@SpringBean
private ContentSettings contentSettings;
@SpringBean
private LearningItemRepository learningItemRepository;
jk
On Wed, May 09, 2007 at 05:36:52PM -0500, Matt Welch wrote:
I am using the @SpringBean annotation to instantiate Spring dependencies in
my wicket pages but I have one page that is giving me a error that I'm
having trouble dealing with. Here's an example.
The Wicket page class:
public class Viewer extends WebPage {
@SpringBean(name = contentSettings)
private ContentSettings contentSettings;
@SpringBean(name = learningItemRepository)
private LearningItemRepository learningItemRepository;
public Viewer() {
//add some simple components to the page
}
}
-
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Re: [Wicket-user] Wicket requiring one of my Spring managed beans to have a default constructor
Thanks. That's great information to have. I now have a couple of clear directions I can go to solve the issue. On 5/9/07, Igor Vaynberg [EMAIL PROTECTED] wrote: if your class is an interface then wicket will create a jdk proxy. if your class is not an interface then we cannot create this proxy, so wicket uses cglib to create a proxy from a concrete class. having this empty constructor must be a cglib requirement. -igor - 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
[Wicket-user] Wicket requiring one of my Spring managed beans to have a default constructor
I am using the @SpringBean annotation to instantiate Spring dependencies in
my wicket pages but I have one page that is giving me a error that I'm
having trouble dealing with. Here's an example.
The Wicket page class:
public class Viewer extends WebPage {
@SpringBean(name = contentSettings)
private ContentSettings contentSettings;
@SpringBean(name = learningItemRepository)
private LearningItemRepository learningItemRepository;
public Viewer() {
//add some simple components to the page
}
}
The vast majority of the time, my Spring managed beans are implementations
of interfaces and not standalone concrete classes, however, in this
particular situation I have about a dozen or so beans that don't need to
follow that pattern.
LearningRepository is an interface with a concrete implementation.
ContentSettings on the other hand is a standalone concrete class. Both
classes are properly setup in my Spring configuration xml files and I have a
suite of unit tests which load the classes using Spring so I know that they
should work. In fact, LearningRepository does work fine, but I'm getting
an error from Wicket with regards to the the ContentSettings class:
-
java.lang.IllegalArgumentException: Superclass has no null constructors but
no arguments were given
at net.sf.cglib.proxy.Enhancer.emitConstructors(Enhancer.java:718)
at net.sf.cglib.proxy.Enhancer.generateClass(Enhancer.java:499)
at net.sf.cglib.core.DefaultGeneratorStrategy.generate(
DefaultGeneratorStrategy.java:25)
at net.sf.cglib.core.AbstractClassGenerator.create(
AbstractClassGenerator.java:216)
at net.sf.cglib.proxy.Enhancer.createHelper(Enhancer.java:377)
at net.sf.cglib.proxy.Enhancer.create(Enhancer.java:285)
at org.apache.wicket.proxy.LazyInitProxyFactory.createProxy(
LazyInitProxyFactory.java:138)
at
org.apache.wicket.spring.injection.annot.AnnotProxyFieldValueFactory.getFieldValue
(AnnotProxyFieldValueFactory.java:102)
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:914)
at org.apache.wicket.Component.init(Component.java:606)
at org.apache.wicket.MarkupContainer.init(MarkupContainer.java:111)
at org.apache.wicket.Page.init(Page.java:195)
at org.apache.wicket.markup.html.WebPage.init(WebPage.java:97)
at com.ptc.fusion.web.pages.FusionBasePage.init(FusionBasePage.java:18)
at com.ptc.fusion.web.pages.viewer.Viewer.init(Viewer.java:41)
at com.ptc.fusion.web.pages.viewer.Viewer$1.getPage(Viewer.java:79)
at org.apache.wicket.markup.html.link.PageLink.onClick(PageLink.java:153)
at org.apache.wicket.markup.html.link.Link.onLinkClicked(Link.java:222)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.apache.wicket.RequestListenerInterface.invoke(
RequestListenerInterface.java:186)
at
org.apache.wicket.request.target.component.listener.ListenerInterfaceRequestTarget.processEvents
(ListenerInterfaceRequestTarget.java:73)
at org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(
AbstractRequestCycleProcessor.java:90)
at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java
:962)
at org.apache.wicket.RequestCycle.step(RequestCycle.java:1035)
at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1114)
at org.apache.wicket.RequestCycle.request(RequestCycle.java:474)
at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:248)
at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java
:122)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(
ServletHandler.java:1065)
at
org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal
(OpenSessionInViewFilter.java:173)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(
OncePerRequestFilter.java:77)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(
ServletHandler.java:1065)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:365)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java
:185)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:689)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:391)
at org.mortbay.jetty.handler.ContextHandlerCollection.handle(
ContextHandlerCollection.java:146)
at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java
:114)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
at org.mortbay.jetty.Server.handle(Server.java:285)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:457)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(
HttpConnection.java:751)
Re: [Wicket-user] Wicket requiring one of my Spring managed beans to have a default constructor
you have to have an empty constructor. afaik it doesnt have to be public.
this is so that cglib can create a proxy, i dont think there is a way around
it.
-igor
On 5/9/07, Matt Welch [EMAIL PROTECTED] wrote:
I am using the @SpringBean annotation to instantiate Spring dependencies
in my wicket pages but I have one page that is giving me a error that I'm
having trouble dealing with. Here's an example.
The Wicket page class:
public class Viewer extends WebPage {
@SpringBean(name = contentSettings)
private ContentSettings contentSettings;
@SpringBean(name = learningItemRepository)
private LearningItemRepository learningItemRepository;
public Viewer() {
//add some simple components to the page
}
}
The vast majority of the time, my Spring managed beans are implementations
of interfaces and not standalone concrete classes, however, in this
particular situation I have about a dozen or so beans that don't need to
follow that pattern.
LearningRepository is an interface with a concrete implementation.
ContentSettings on the other hand is a standalone concrete class. Both
classes are properly setup in my Spring configuration xml files and I have a
suite of unit tests which load the classes using Spring so I know that they
should work. In fact, LearningRepository does work fine, but I'm getting
an error from Wicket with regards to the the ContentSettings class:
-
java.lang.IllegalArgumentException: Superclass has no null constructors
but no arguments were given
at net.sf.cglib.proxy.Enhancer.emitConstructors (Enhancer.java:718)
at net.sf.cglib.proxy.Enhancer.generateClass(Enhancer.java:499)
at net.sf.cglib.core.DefaultGeneratorStrategy.generate(
DefaultGeneratorStrategy.java:25)
at net.sf.cglib.core.AbstractClassGenerator.create (
AbstractClassGenerator.java:216)
at net.sf.cglib.proxy.Enhancer.createHelper(Enhancer.java:377)
at net.sf.cglib.proxy.Enhancer.create(Enhancer.java:285)
at org.apache.wicket.proxy.LazyInitProxyFactory.createProxy (
LazyInitProxyFactory.java:138)
at
org.apache.wicket.spring.injection.annot.AnnotProxyFieldValueFactory.getFieldValue
(AnnotProxyFieldValueFactory.java:102)
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:914)
at org.apache.wicket.Component.init(Component.java:606)
at org.apache.wicket.MarkupContainer.init(MarkupContainer.java:111)
at org.apache.wicket.Page.init( Page.java:195)
at org.apache.wicket.markup.html.WebPage.init(WebPage.java:97)
at com.ptc.fusion.web.pages.FusionBasePage.init(FusionBasePage.java:18)
at com.ptc.fusion.web.pages.viewer.Viewer .init(Viewer.java:41)
at com.ptc.fusion.web.pages.viewer.Viewer$1.getPage(Viewer.java:79)
at org.apache.wicket.markup.html.link.PageLink.onClick(PageLink.java:153)
at org.apache.wicket.markup.html.link.Link.onLinkClicked (Link.java:222)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.apache.wicket.RequestListenerInterface.invoke(
RequestListenerInterface.java:186)
at
org.apache.wicket.request.target.component.listener.ListenerInterfaceRequestTarget.processEvents(
ListenerInterfaceRequestTarget.java:73)
at org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(
AbstractRequestCycleProcessor.java:90)
at org.apache.wicket.RequestCycle.processEventsAndRespond (
RequestCycle.java:962)
at org.apache.wicket.RequestCycle.step(RequestCycle.java:1035)
at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1114)
at org.apache.wicket.RequestCycle.request(RequestCycle.java :474)
at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java
:248)
at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java
:122)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter (
ServletHandler.java:1065)
at
org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal
(OpenSessionInViewFilter.java:173)
at org.springframework.web.filter.OncePerRequestFilter.doFilter (
OncePerRequestFilter.java:77)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(
ServletHandler.java:1065)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java
:365)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java
:185)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java
:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:689)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:391)
at org.mortbay.jetty.handler.ContextHandlerCollection.handle(
ContextHandlerCollection.java:146)
at org.mortbay.jetty.handler.HandlerCollection.handle (
HandlerCollection.java:114)
at
Re: [Wicket-user] Wicket requiring one of my Spring managed beans to have a default constructor
Thanks for that confirmation, Igor. I guess I was just a little surprised because none of my other classes that are instantiated using the same technique have an empty constructor. I guess that there must be something at play there having to do with the fact that those other classes are implementations of interfaces as opposed to being a standalone concrete classes the way ContentSettings is. -Matt On 5/9/07, Igor Vaynberg [EMAIL PROTECTED] wrote: you have to have an empty constructor. afaik it doesnt have to be public. this is so that cglib can create a proxy, i dont think there is a way around it. -igor - 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
Re: [Wicket-user] Wicket requiring one of my Spring managed beans to have a default constructor
if your class is an interface then wicket will create a jdk proxy. if your class is not an interface then we cannot create this proxy, so wicket uses cglib to create a proxy from a concrete class. having this empty constructor must be a cglib requirement. -igor On 5/9/07, Matt Welch [EMAIL PROTECTED] wrote: Thanks for that confirmation, Igor. I guess I was just a little surprised because none of my other classes that are instantiated using the same technique have an empty constructor. I guess that there must be something at play there having to do with the fact that those other classes are implementations of interfaces as opposed to being a standalone concrete classes the way ContentSettings is. -Matt On 5/9/07, Igor Vaynberg [EMAIL PROTECTED] wrote: you have to have an empty constructor. afaik it doesnt have to be public. this is so that cglib can create a proxy, i dont think there is a way around it. -igor - 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
