what do you mean exactly by "trying to define a class in classloader" ?
I didn't do anything special in creating these instances and just follow the
normal route.
The one thing that may have some, I dont'know : "dependency cycle thing"
going on is:
SuperPage referencing component quickNavigation
and quickNavigation referencing Superpage by using componentResources to
travere the component-tree upwards.
No sign of double recreating a base-class twice (in one pass)
please keep the options coming,
I will investigate further,
Geert-Jan
joshcanfield wrote:
>
> That error can be caused by trying to define a class in classloader which
> already contains a class with the same name. I believe that Tapestry does
> some magic with the component base classes when it is extending them...
> maybe there is something causing Tapestry to try and recreate the base
> class
> twice?
>
> On Dec 21, 2007 10:37 AM, Britske <[EMAIL PROTECTED]> wrote:
>
>>
>> As an addition:
>>
>> also pointing out what type of errors are likely to cause these errors
>> would
>> help.
>> I know that mixing injection with components can give loader constraints,
>> which is why i created an interface for SuperPage. Moreover, I can
>> mimagine
>> that cyclic references would cause errors as well. Are there any others
>> that
>> I should track in my code?
>>
>> Thanks again,
>> Geert-Jan
>>
>>
>> Britske wrote:
>> >
>> > I'm going slightly insane on this one..
>> > that's because everything worked fine, and after some slight
>> modifications
>> > (none that could cause such errors I believe) I can't backtrack
>> anymore
>> > where things went wrong.
>> >
>> > The error I'm getting is this:
>> >
>> > Could not convert 'page.quickNavigation' into a component parameter
>> > binding: java.lang.LinkageError: Class
>> > com/wrappt/aroer/base/AbstractNavigationContainer violates loader
>> > constraints.
>> > for full stack-trace see entirely below.
>> >
>> > location
>> > classpath:com/wrappt/aroer/components/BaseLayout.tml, line 122,
>> column
>> > 77
>> > 117 <div class="h plain">
>> > 118 <h2>Verfijn de resultaten</h2>
>> > 119 </div>
>> > 120 <div class="c">
>> > 121 <!-- <t:quickForm t:id="quickForm"/>-->
>> > 122 <t:delegate t:id="quickFormDelegate" t:to="
>> page.quickNavigation"/>
>> > <-- here it happens
>> > 123 </div>
>> > 124 <div class="f"> </div>
>> > 125 </div>
>> > 126 </div>
>> > 127 </div>
>> >
>> > the setup is not that simple, but here it goes anyway:
>> >
>> > - baselayout is a basic layout that wraps all pages as implemented in
>> an
>> > abstract class called superPage.
>> > - all pages extend SuperPage.
>> > - SuperPage implements ISuperPage (for mixing services with components)
>> > - all pages have a quicknavigation component , although their
>> > implementation can be different.
>> > - each quickNavigation-component inherits from
>> AbstractNavigationContainer
>> > (which is where the loader constraint happens)
>> >
>> > the relevant parts:
>> >
>> > BaseLayout
>> > ----------------------
>> > @Parameter(required = true)
>> > private ISuperPage page;
>> > public ISuperPage getPage()
>> > {
>> > return (ISuperPage)page;
>> > }
>> >
>> >
>> > SuperPage (implements ISuperPage)
>> > --------------
>> > @Component(parameters={"page=this"})
>> > private BaseLayout bl;
>> >
>> > public abstract AbstractNavigationContainer getQuickNavigation();
>> >
>> > Aanbiedingen extends SuperPage
>> > ----------------------------------
>> > @Component private QuickFormAllResults quickNavigation;
>> > public QuickFormAllResults getQuickNavigation() {
>> > return this.quickNavigation;
>> > }
>> >
>> > Aanbiedingen.tml
>> > ----------------------
>> > <t:baselayout t:id="bl"
>> > xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd";>
>> > <t:block>
>> > <t:quickformallresults t:id="quickNavigation"/>
>> > </t:block>
>> > ...
>> > </t:baselayout>
>> >
>> > and finally:
>> > QuickFormAllResults extends AbstractNavigationContainer
>> > ---------------------
>> > // nothing intersteing here
>> >
>> >
>> > AbstractNavigationContainer
>> > -------------------------------
>> > public SuperPage getPage()
>> > {
>> > ..... //uses componentresources to recursively traverse the tree
>> upwards
>> > until it finds a componet
>> > of type SuperPage and returns that..
>> > }
>> >
>> >
>> > I'm really out of options, as I can't seem to comment enough lines to
>> make
>> > it work: when i comment quicknavigation in baselayout.tml the error
>> > simply shifts to another component that implements
>> > AbstractNavigationContainer
>> >
>> > Thanks a lot for any help!
>> > Geert-Jan
>> >
>> > p.s: i was on 5.0.7 SNAPSHOT and now back on 5.0.6
>> >
>> > stacktrace:
>> > Caused by: java.lang.LinkageError: Class
>> > com/wrappt/aroer/base/AbstractNavigationContainer violates loader
>> > constraints
>> > at java.lang.ClassLoader.defineClass1(Native Method)
>> > at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
>> > at
>> > java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
>> > at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
>> > at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
>> > at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
>> > at java.security.AccessController.doPrivileged(Native Method)
>> > at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
>> > at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
>> > at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
>> > at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
>> > at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
>> > at java.lang.Class.getDeclaredMethods0(Native Method)
>> > at java.lang.Class.privateGetDeclaredMethods(Class.java:2395)
>> > at java.lang.Class.getDeclaredMethods(Class.java:1763)
>> > at java.beans.Introspector$1.run(Introspector.java:1265)
>> > at java.security.AccessController.doPrivileged(Native Method)
>> > at
>> >
>> java.beans.Introspector.getPublicDeclaredMethods(Introspector.java:1263)
>> > at java.beans.Introspector.getTargetMethodInfo(Introspector.java
>> :1129)
>> > at java.beans.Introspector.getBeanInfo(Introspector.java:387)
>> > at java.beans.Introspector.getBeanInfo(Introspector.java:159)
>> > at
>> >
>> org.apache.tapestry.ioc.internal.services.PropertyAccessImpl.buildAdapter(
>> PropertyAccessImpl.java:85)
>> > ... 72 more
>> >
>>
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