After a jboss restart and clean deploy, the application is deployed fine.
Below is what I did:

   - javassist.jar is removed from JBOSS_HOME/server/default/lib folder.
   - javassist-3.9.0-GA.jar is put inside JBOSS_HOME/server/default/lib
   folder.
   - javassist-3.9.0-GA.jar is removed from WEB-INF/lib directory.

Thanks for your response.

On Fri, Jul 9, 2010 at 11:12 AM, Halil Karakose <halilkarak...@gmail.com>wrote:

> Actually this is the default Appfuse User class. And the class has no-arg
> constructor.
>
> I've been debuggin jboss now. During jboss startup,
> javassist.util.proxy.ProxyFactory.setField() method throws the exception in
> the following highlighted line.
>
>             private void setField(String fieldName, Object value) {
>         if(thisClass != null && value != null)
>
>             try { Field f = thisClass.getField(fieldName);
>                 SecurityActions.setAccessible(f, true);
>                 *f.set(null, value);*
>                 SecurityActions.setAccessible(f, false);
>                     }
>             catch(Exception e) {
>                 throw new RuntimeException(e);
>                     }
>             }
> *
> Values Of setField() Parameters:*
> value= instance of
> "org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer"
> fieldName="_method_filter"
>
> In the highlighted line, JavassistLazyInitializer cannot be set to null.
>
> If I set a breakpoint to the highlighted line and set the
> JavassistLazyInitializer instance to null, exception does not occur.
>
> On Thu, Jul 8, 2010 at 11:58 AM, Dmitry Gusev <dmitry.gu...@gmail.com>wrote:
>
>> Make sure com.mycompany.model.User has non-args public constructor.
>>
>> On Thu, Jul 8, 2010 at 12:49, Halil Karakose <halilkarak...@gmail.com
>> >wrote:
>>
>> > Changing javassist jar didn't work. I still receive the errors.
>> >
>> > By the way, the exception is thrown by
>> > "org.hibernate.tuple.entity.PojoEntityTuplizer".
>> > Is there a incompatibility with the hibernate jars?
>> >
>> > One more issue is that the logging level of the stack trace is in WARN
>> > level. And I still haven't encountered anything weird in runtime.
>> >
>> > On Thu, Jul 1, 2010 at 9:50 AM, Joachim Van der Auwera <
>> joac...@progs.be
>> > >wrote:
>> >
>> > > I think you should update the javassist in jboss/server/default/lib/
>> > > folder.
>> > >
>> > > Joachim
>> > >
>> > >
>> > > On 07/01/2010 08:08 AM, Halil Karakose wrote:
>> > >
>> > >> Hi,
>> > >> I receive an error in my Tapestry webapp. I use Tapestry 5.1.0.5 and
>> > Jboss
>> > >> 4.2.3-GA.
>> > >>
>> > >>
>> > >> *Scenario 1:*
>> > >> My web application contains javassist 3.9.0.GA in WEB-INF/lib
>> folder.
>> > And
>> > >> there is also another javassist.jar(3.6.0.GA) file inside
>> > >> jboss/server/default/lib folder.
>> > >>
>> > >> During deployment of the web application, I receive such an
>> exception:
>> > >>
>> > >> 22:12:28,373 WARN  buildProxyFactory
>> > >> [org.hibernate.tuple.entity.PojoEntityTuplizer] could not create
>> proxy
>> > >> factory for:com.mycompany.model.User
>> > >> org.hibernate.HibernateException: Javassist Enhancement failed:
>> > >> com.mycompany.model.User
>> > >>     at
>> > >>
>> > >>
>> >
>> org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.getProxyFactory(JavassistLazyInitializer.java:145)
>> > >>     at
>> > >>
>> > >>
>> >
>> org.hibernate.proxy.pojo.javassist.JavassistProxyFactory.postInstantiate(JavassistProxyFactory.java:42)
>> > >>     at
>> > >>
>> > >>
>> >
>> org.hibernate.tuple.entity.PojoEntityTuplizer.buildProxyFactory(PojoEntityTuplizer.java:162)
>> > >>     at
>> > >>
>> > >>
>> >
>> org.hibernate.tuple.entity.AbstractEntityTuplizer.<init>(AbstractEntityTuplizer.java:135)
>> > >>     at
>> > >>
>> > >>
>> >
>> org.hibernate.tuple.entity.PojoEntityTuplizer.<init>(PojoEntityTuplizer.java:55)
>> > >>     at
>> > >>
>> > >>
>> >
>> org.hibernate.tuple.entity.EntityEntityModeToTuplizerMapping.<init>(EntityEntityModeToTuplizerMapping.java:56)
>> > >>     at
>> > >>
>> > >>
>> >
>> org.hibernate.tuple.entity.EntityMetamodel.<init>(EntityMetamodel.java:302)
>> > >> Caused by: java.lang.RuntimeException:
>> > java.lang.IllegalArgumentException:
>> > >> Can not set static javassist.util.proxy.MethodFilter field
>> > >> com.mycompany.model.User_$$_javassist_5._method_filter to
>> > >> org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer$1
>> > >>     at
>> javassist.util.proxy.ProxyFactory.setField(ProxyFactory.java:356)
>> > >>     at
>> > >> javassist.util.proxy.ProxyFactory.createClass3(ProxyFactory.java:339)
>> > >>     at
>> > >> javassist.util.proxy.ProxyFactory.createClass2(ProxyFactory.java:312)
>> > >>     at
>> > >> javassist.util.proxy.ProxyFactory.createClass(ProxyFactory.java:271)
>> > >>     at
>> > >>
>> > >>
>> >
>> org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.getProxyFactory(JavassistLazyInitializer.java:138)
>> > >>     ... 171 more
>> > >>
>> > >>
>> > >> This error doesn't prevent deployment. And I have no idea what the
>> > impact
>> > >> of
>> > >> this error is or will be. I can select, and insert via webapp.
>> > >>
>> > >>
>> > >> *Scenario 2:*
>> > >> If I exclude javassist 3.9.0.GA from my Tapestry webapp and leave
>> > jboss's
>> > >> javassist.jar in place, the application deploys without exception.
>> But,
>> > in
>> > >> this case, I encounter an exception in runtime:
>> > >>
>> > >> org.apache.tapestry5.internal.services.TransformationException:
>> > >> javassist.CannotCompileException: broken method
>> > >>
>> > >> InternalClassTransformation[
>> > >>
>> > >> public com.mycompany.webapp.pages.PasswordHint extends
>> > >> com.mycompany.webapp.pages.BasePage
>> > >>
>> > >>
>> > >>
>> > >> add method: private void _$write_logger_2(org.slf4j.Logger $1)
>> > >>
>> > >> throw new java.lang.RuntimeException("Field
>> > >> com.mycompany.webapp.pages.PasswordHint.logger is read-only.");
>> > >>
>> > >>
>> > >>
>> > >> replace write logger: _$write_logger_2();
>> > >> ..........
>> > >>
>> > >>
>> > >> I am now following scenario 1, and I have not faced anything weird in
>> > >> runtime? Any suggestions are appreciated:),
>> > >>
>> > >>
>> > >> Thanks...
>> > >>
>> > >
>> >
>>
>>
>>
>> --
>> Dmitry Gusev
>>
>> AnjLab Team
>> http://anjlab.com
>>
>
>

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