Cara, faz o seguinte: pega o projeto do site, coloca no teu eclipse sem
modificação nenhuma e tenta rodar.
Se der erro, posta o stacktrace completo pra gente.
Se não der erro, começa a copiar suas modificações uma por uma pra este
projeto. Entre uma cópia e outra, rode pra ver se ainda está funcionando. Se
der erro, vc sabe que foi a última coisa que vc copiou.

Abraço

Peter P. Lupo
http://craftnicely.blogspot.com - http://sites.google.com/site/pplupo
 <http://sites.google.com/site/pplupo>MPS.BR Authorized Implementation
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 <http://www.blackbeltfactory.com/ui#!User/pplupo>+55 (021) 81742487



2010/7/28 Felipe Costa <[email protected]>

> Voce fez isso no seu pc ou no LCI?
>
>
> --
> Felipe Costa
> Undergraduating in Computer Science at UFRJ
> Black belt <http://www.blackbeltfactory.com/ui#User/fcosta> on
> JavaBlackBelt  <http://www.blackbeltfactory.com/ui#User/fcosta>
>
>
>
> 2010/7/28 Romulo Freires <[email protected]>
>
>> isso.
>>
>> Em 28 de julho de 2010 21:55, Felipe Costa 
>> <[email protected]>escreveu:
>>
>> Como vc rodou o projeto? Voce baixou no site e importou ele pelo eclipse
>>> direto?
>>>
>>> Abs
>>> --
>>> Felipe Costa
>>> Undergraduating in Computer Science at UFRJ
>>> Black belt <http://www.blackbeltfactory.com/ui#User/fcosta> on
>>> JavaBlackBelt  <http://www.blackbeltfactory.com/ui#User/fcosta>
>>>
>>>
>>>
>>> 2010/7/28 Romulo Freires <[email protected]>
>>>
>>>> Eu só achei uma solução, excluir a linha no zk.xml
>>>>
>>>>  <value>comp2web_persistence_unit</value>
>>>>
>>>>  no zk.xml, alguém pode me dizer se isso vai causar alguma complicação
>>>> lá frente?
>>>>
>>>> Em 28 de julho de 2010 21:01, Romulo Freires 
>>>> <[email protected]>escreveu:
>>>>
>>>> Já que eu não consigo fazer um projeto que funcione o zk e JPA Eu peguei
>>>>> aquele projeto com2web, já que ele já tinha os arquivos de zk e JPA e to
>>>>> refazendo meu projeto nele.
>>>>>
>>>>> mas qualquer vista que elaboro dar esse erro aqui quando eu dou run
>>>>>
>>>>> *type* Exception report
>>>>>
>>>>> *message* **
>>>>>
>>>>> *description* *The server encountered an internal error () that
>>>>> prevented it from fulfilling this request.*
>>>>>
>>>>> *exception*
>>>>>
>>>>> javax.servlet.ServletException: Servlet execution threw an exception
>>>>>
>>>>>  *root cause*
>>>>>
>>>>> java.lang.ExceptionInInitializerError
>>>>>   
>>>>> org.zkoss.zkplus.jpa.JpaUtil.createEntityManagerFactory(JpaUtil.java:260)
>>>>>   org.zkoss.zkplus.jpa.JpaUtil.initEntityManagerFactory(JpaUtil.java:213)
>>>>>   org.zkoss.zkplus.jpa.JpaUtil.createEntityManager(JpaUtil.java:272)
>>>>>   org.zkoss.zkplus.jpa.JpaUtil.initEntityManger(JpaUtil.java:232)
>>>>>   org.zkoss.zkplus.jpa.JpaUtil.getEntityManager(JpaUtil.java:142)
>>>>>   
>>>>> org.zkoss.zkplus.jpa.OpenEntityManagerInViewListener.init(OpenEntityManagerInViewListener.java:72)
>>>>>   
>>>>> org.zkoss.zk.ui.util.Configuration.invokeExecutionInits(Configuration.java:817)
>>>>>   org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage0(UiEngineImpl.java:333)
>>>>>   org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage(UiEngineImpl.java:286)
>>>>>   
>>>>> org.zkoss.zk.ui.http.DHtmlLayoutServlet.process(DHtmlLayoutServlet.java:237)
>>>>>   
>>>>> org.zkoss.zk.ui.http.DHtmlLayoutServlet.doGet(DHtmlLayoutServlet.java:159)
>>>>>   javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
>>>>>   javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
>>>>>
>>>>>  *root cause*
>>>>>
>>>>> javax.persistence.PersistenceException: No Persistence provider for 
>>>>> EntityManager named comp2web_persistence_unit
>>>>>   
>>>>> javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:54)
>>>>>   
>>>>> javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:32)
>>>>>   
>>>>> org.zkoss.zkplus.jpa.JpaUtil.createEntityManagerFactory(JpaUtil.java:252)
>>>>>   org.zkoss.zkplus.jpa.JpaUtil.initEntityManagerFactory(JpaUtil.java:213)
>>>>>   org.zkoss.zkplus.jpa.JpaUtil.createEntityManager(JpaUtil.java:272)
>>>>>   org.zkoss.zkplus.jpa.JpaUtil.initEntityManger(JpaUtil.java:232)
>>>>>   org.zkoss.zkplus.jpa.JpaUtil.getEntityManager(JpaUtil.java:142)
>>>>>   
>>>>> org.zkoss.zkplus.jpa.OpenEntityManagerInViewListener.init(OpenEntityManagerInViewListener.java:72)
>>>>>   
>>>>> org.zkoss.zk.ui.util.Configuration.invokeExecutionInits(Configuration.java:817)
>>>>>   org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage0(UiEngineImpl.java:333)
>>>>>   org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage(UiEngineImpl.java:286)
>>>>>   
>>>>> org.zkoss.zk.ui.http.DHtmlLayoutServlet.process(DHtmlLayoutServlet.java:237)
>>>>>   
>>>>> org.zkoss.zk.ui.http.DHtmlLayoutServlet.doGet(DHtmlLayoutServlet.java:159)
>>>>>   javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
>>>>>   javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
>>>>>
>>>>>
>>>>> Alguém sabe resolver?
>>>>>
>>>>> Em 28 de julho de 2010 15:42, Felipe Costa <[email protected]
>>>>> > escreveu:
>>>>>
>>>>> Lembrando que com o ZK, voce pode usar a classe JPAUtil pra pegar o
>>>>>> EntityManager.
>>>>>> Voce não vão precisar pegar o EntityManagerFactory e nem usar
>>>>>> transacation, desde que tudo esteja configurado no zk.xml. ;-)
>>>>>>
>>>>>>
>>>>>> Abs
>>>>>> --
>>>>>> Felipe Costa
>>>>>> Undergraduating in Computer Science at UFRJ
>>>>>> Black belt <http://www.blackbeltfactory.com/ui#User/fcosta> on
>>>>>> JavaBlackBelt  <http://www.blackbeltfactory.com/ui#User/fcosta>
>>>>>>
>>>>>>
>>>>>>
>>>>>> 2010/7/28 Romulo Freires <[email protected]>
>>>>>>
>>>>>>> vlw felipe
>>>>>>>
>>>>>>> Em 28 de julho de 2010 15:17, Felipe Costa <
>>>>>>> [email protected]> escreveu:
>>>>>>>
>>>>>>> Voce vai criar o projeto em ZK normalmente.
>>>>>>>> Na pasta src voce vai colocar o o arquivo persistence.xml na pasta
>>>>>>>> META-INF e log.xml(ou algo assim).
>>>>>>>> Depois disso voce vai ter que configurar zk.xml pra usar o JPA. Dá
>>>>>>>> uma olhada no projeto que tá no site, lá ta tudo configurado!
>>>>>>>>
>>>>>>>> Abs
>>>>>>>> --
>>>>>>>> Felipe Costa
>>>>>>>> Undergraduating in Computer Science at UFRJ
>>>>>>>> Black belt <http://www.blackbeltfactory.com/ui#User/fcosta> on
>>>>>>>> JavaBlackBelt  <http://www.blackbeltfactory.com/ui#User/fcosta>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> 2010/7/28 Peter P. Lupo <[email protected]>
>>>>>>>>
>>>>>>>> Parte do exemplo do Felipe que tem tudo. ;-)
>>>>>>>>>
>>>>>>>>> Depois eu posso explicar como faz pra criar do zero, mas agora não
>>>>>>>>> dá. Tô de saída.
>>>>>>>>>
>>>>>>>>> Abraço
>>>>>>>>>
>>>>>>>>> Peter P. Lupo
>>>>>>>>> http://craftnicely.blogspot.com -
>>>>>>>>> http://sites.google.com/site/pplupo
>>>>>>>>>  <http://sites.google.com/site/pplupo>MPS.BR Authorized
>>>>>>>>> Implementation 
>>>>>>>>> Practitioner<http://www.softex.br/mpsbr/_profissionais/MPS.BR_certificados_de_arovacao_prova_P2-MPS.BR.pdf>-
>>>>>>>>>  Certified
>>>>>>>>> ScrumMaster<http://www.scrumalliance.org/pages/certified_scrummaster>
>>>>>>>>>  <http://www.scrumalliance.org/pages/certified_scrummaster>Sun
>>>>>>>>> Certified Java 
>>>>>>>>> Associate<http://www.sun.com/training/certification/java/scja.xml>- 
>>>>>>>>> Java
>>>>>>>>> Black Belt <http://www.blackbeltfactory.com/ui#%21User/pplupo>
>>>>>>>>>  <http://www.blackbeltfactory.com/ui#%21User/pplupo>+55 (021)
>>>>>>>>> 81742487
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> 2010/7/28 Romulo Freires <[email protected]>
>>>>>>>>>
>>>>>>>>> Agora eu to con dificuldade em ter um projeto zk e que também tenha
>>>>>>>>>> os arquivos do jpa.
>>>>>>>>>>
>>>>>>>>>> O eclipse dar a opção de criar um zk projeto e também JPA projeto,
>>>>>>>>>> mas é um ou outro.
>>>>>>>>>>
>>>>>>>>>> Quando eu levo o modelo e o controlador para o projeto zk, nada de
>>>>>>>>>> JPA é reconhecido.
>>>>>>>>>>
>>>>>>>>>> Alguém tem uma solução?
>>>>>>>>>>
>>>>>>>>>> :) não consegui sair nem desta parte simples ^^
>>>>>>>>>>
>>>>>>>>>> Em 28 de julho de 2010 08:47, Romulo Freires <
>>>>>>>>>> [email protected]> escreveu:
>>>>>>>>>>
>>>>>>>>>> vlw
>>>>>>>>>>>
>>>>>>>>>>> Em 27 de julho de 2010 22:59, Felipe Costa <
>>>>>>>>>>> [email protected]> escreveu:
>>>>>>>>>>>
>>>>>>>>>>> Esse "alguma coisa" é o nome do projeto. Voce pode ver isso no
>>>>>>>>>>>> arquivo web.xml, no começo dele tem o nome do projeto.
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> Abs
>>>>>>>>>>>> --
>>>>>>>>>>>> Felipe Costa
>>>>>>>>>>>> Undergraduating in Computer Science at UFRJ
>>>>>>>>>>>> Black belt <http://www.blackbeltfactory.com/ui#User/fcosta> on
>>>>>>>>>>>> JavaBlackBelt  <http://www.blackbeltfactory.com/ui#User/fcosta>
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> 2010/7/27 Romulo Freires <[email protected]>
>>>>>>>>>>>>
>>>>>>>>>>>>> eu já configurei, agora eu quero ver um projeto(vista) na web
>>>>>>>>>>>>> , acho que tinha algo do tipo
>>>>>>>>>>>>> http://localhost:8080/algumacoisa na aula de zk
>>>>>>>>>>>>>
>>>>>>>>>>>>> to tentado ver aquele "primeiros passos" que você colocou no
>>>>>>>>>>>>> site.
>>>>>>>>>>>>> Em 27 de julho de 2010 19:05, Felipe Costa <
>>>>>>>>>>>>> [email protected]> escreveu:
>>>>>>>>>>>>>
>>>>>>>>>>>>> Dá uma olhada no slide, eu coloquei um passo a passo lá pra
>>>>>>>>>>>>>> essa parte de configuração.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Abs
>>>>>>>>>>>>>> --
>>>>>>>>>>>>>> Felipe Costa
>>>>>>>>>>>>>> Undergraduating in Computer Science at UFRJ
>>>>>>>>>>>>>> Black belt <http://www.blackbeltfactory.com/ui#User/fcosta> on
>>>>>>>>>>>>>> JavaBlackBelt <http://www.blackbeltfactory.com/ui#User/fcosta>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> 2010/7/27 Romulo Freires <[email protected]>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>  Felipe
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Eu já instalei o tomcat 6, agora o que falta fazer?
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> E como eu vejo um projeto na web?
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Estou dando run nos exemplo do site.
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> --
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