[ 
https://issues.apache.org/jira/browse/TAP5-1796?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Jochen Kemnade updated TAP5-1796:
---------------------------------
    Description: 
In Tapestry 5.3, I have a page PageA  which is  a parameterized page of a 
generic base page.
PageA has a form with a zone. Somehow no result is rendered  on the client side 
if the zone is updated, and then follow by a form  submit. 

Attached is a maven project to reproduce  my error.

Steps to reproduce error :  pageA -> choose Audi -> click submit
                                    (then Audi, A4 are displayed on the bottom 
of the page)
                                       --> choose BMW
                                       -- > click submit
                                    This time, make and model are both blank  
at the bottom of the page.                                        
                                     I was expecting BMW and 3 series to be 
displayed.
          
                                   
{code}                                     
public abstract class BasePage<T extends BaseBean>{
    private Logger log = Logger.getLogger(BasePage.class);
        
        @Persist(PersistenceConstants.FLASH)
        private T bean;
        
        @Persist(PersistenceConstants.FLASH)
        @Property
        private boolean showOutput;
        
        
        void onSubmitFromForm(){
                showOutput = true;
        }
        
        public T getBean(){
                 
                if (bean == null){
                    bean = createBean();
                        
                }
                return bean;
        }
        
        
        protected T createBean(){
                T newInstance = null;
                
                    try {
                        Class<T> clazz = getBeanClass();
                                newInstance =clazz.newInstance();
                        } catch (InstantiationException e) {
                                log.info(e);
                                
                        } catch (IllegalAccessException e) {
                                log.info(e);
                        }
                
            return newInstance;
        }
        
        
        protected abstract Class<T> getBeanClass();
}
{code}
------------



{code}
public class PageA extends BasePage<PageABean> {

        @InjectComponent
        private Zone modelZone;

        @Property
        @Persist
        private List<String> availableModels;

        
        public Object onValueChanged(CarMaker maker) 
    {
       availableModels = findAvailableModels(maker);
       
       return modelZone.getBody();
    }
    
    public List<String> findAvailableModels(final CarMaker maker) 
    {
      switch (maker) 
      {
         case AUDI:
            return Arrays.asList("A4", "A6", "A8");
         case BMW:
            return Arrays.asList("3 Series", "5 Series", "7 Series");
         case MERCEDES:
            return Arrays.asList("C-Class", "E-Class", "S-Class");
         default:
            return Arrays.asList();
       }
    }
    
    
        @Override
        protected Class<PageABean> getBeanClass() {
                return PageABean.class;
        }

        
}
{code}
----------------
PageA.tml


{code}
     <t:form>
      <p>
         <t:errors />
      </p>
      <p>
         Car Marker : <t:select t:id="carMaker" validate="required" 
value="bean.carMaker"
                   zone="modelZone" />
      </p>
      
      <t:zone t:id="modelZone" id="modelZone">
         <t:if test="bean.carMaker">
           <p>
              Model : <t:select t:id="carModel" model="availableModels" 
validate="required" value="bean.model"/>
           </p>
         </t:if>
      </t:zone>
      
      <p>
         <t:submit value="literal:Submit" />
      </p>
   </t:form>
     
     <t:if test="showOutput">
           Make = ${bean.carMaker} <br/>
           model = ${bean.model}
 
     </t:if>
    </body>
{code}
----------------
{code}
public class PageABean extends BaseBean {

        public enum CarMaker {
                MERCEDES, AUDI, BMW;
        }
        
        
        private CarMaker carMaker;
        
        private String model;

        
        public String getModel() {              
                return model;
        }

        public void setModel(String model) {
                this.model = model;
        }

        public CarMaker getCarMaker() {
                return carMaker;
        }

        public void setCarMaker(CarMaker carMaker) {
                this.carMaker = carMaker;
        }

}
{code}

  was:
In Tapestry 5.3, I have a page PageA  which is  a parameterized page of a 
generic base page.
PageA has a form with a zone. Somehow no result is rendered  on the client side 
if the zone is updated, and then follow by a form  submit. 

Attached is a maven project to reproduce  my error.

Steps to reproduce error :  pageA -> choose Audi -> click submit
                                    (then Audi, A4 are displayed on the bottom 
of the page)
                                       --> choose BMW
                                       -- > click submit
                                    This time, make and model are both blank  
at the bottom of the page.                                        
                                     I was expecting BMW and 3 series to be 
displayed.
          
                                   
                                     
public abstract class BasePage<T extends BaseBean>{
    private Logger log = Logger.getLogger(BasePage.class);
        
        @Persist(PersistenceConstants.FLASH)
        private T bean;
        
        @Persist(PersistenceConstants.FLASH)
        @Property
        private boolean showOutput;
        
        
        void onSubmitFromForm(){
                showOutput = true;
        }
        
        public T getBean(){
                 
                if (bean == null){
                    bean = createBean();
                        
                }
                return bean;
        }
        
        
        protected T createBean(){
                T newInstance = null;
                
                    try {
                        Class<T> clazz = getBeanClass();
                                newInstance =clazz.newInstance();
                        } catch (InstantiationException e) {
                                log.info(e);
                                
                        } catch (IllegalAccessException e) {
                                log.info(e);
                        }
                
            return newInstance;
        }
        
        
        protected abstract Class<T> getBeanClass();
}

------------




public class PageA extends BasePage<PageABean> {

        @InjectComponent
        private Zone modelZone;

        @Property
        @Persist
        private List<String> availableModels;

        
        public Object onValueChanged(CarMaker maker) 
    {
       availableModels = findAvailableModels(maker);
       
       return modelZone.getBody();
    }
    
    public List<String> findAvailableModels(final CarMaker maker) 
    {
      switch (maker) 
      {
         case AUDI:
            return Arrays.asList("A4", "A6", "A8");
         case BMW:
            return Arrays.asList("3 Series", "5 Series", "7 Series");
         case MERCEDES:
            return Arrays.asList("C-Class", "E-Class", "S-Class");
         default:
            return Arrays.asList();
       }
    }
    
    
        @Override
        protected Class<PageABean> getBeanClass() {
                return PageABean.class;
        }

        
}

----------------
PageA.tml



     <t:form>
      <p>
         <t:errors />
      </p>
      <p>
         Car Marker : <t:select t:id="carMaker" validate="required" 
value="bean.carMaker"
                   zone="modelZone" />
      </p>
      
      <t:zone t:id="modelZone" id="modelZone">
         <t:if test="bean.carMaker">
           <p>
              Model : <t:select t:id="carModel" model="availableModels" 
validate="required" value="bean.model"/>
           </p>
         </t:if>
      </t:zone>
      
      <p>
         <t:submit value="literal:Submit" />
      </p>
   </t:form>
     
     <t:if test="showOutput">
           Make = ${bean.carMaker} <br/>
           model = ${bean.model}
 
     </t:if>
    </body>

----------------
public class PageABean extends BaseBean {

        public enum CarMaker {
                MERCEDES, AUDI, BMW;
        }
        
        
        private CarMaker carMaker;
        
        private String model;

        
        public String getModel() {              
                return model;
        }

        public void setModel(String model) {
                this.model = model;
        }

        public CarMaker getCarMaker() {
                return carMaker;
        }

        public void setCarMaker(CarMaker carMaker) {
                this.carMaker = carMaker;
        }

}


> Flash persistence not  working after a zone within a form  is updated in a 
> parameterized page 
> ----------------------------------------------------------------------------------------------
>
>                 Key: TAP5-1796
>                 URL: https://issues.apache.org/jira/browse/TAP5-1796
>             Project: Tapestry 5
>          Issue Type: Bug
>          Components: tapestry-core
>    Affects Versions: 5.3
>            Reporter: Shing Hing Man
>            Priority: Minor
>         Attachments: testgeneric-src.jar
>
>
> In Tapestry 5.3, I have a page PageA  which is  a parameterized page of a 
> generic base page.
> PageA has a form with a zone. Somehow no result is rendered  on the client 
> side if the zone is updated, and then follow by a form  submit. 
> Attached is a maven project to reproduce  my error.
> Steps to reproduce error :  pageA -> choose Audi -> click submit
>                                     (then Audi, A4 are displayed on the 
> bottom of the page)
>                                        --> choose BMW
>                                        -- > click submit
>                                     This time, make and model are both blank  
> at the bottom of the page.                                        
>                                      I was expecting BMW and 3 series to be 
> displayed.
>           
>                                    
> {code}                                     
> public abstract class BasePage<T extends BaseBean>{
>     private Logger log = Logger.getLogger(BasePage.class);
>       
>       @Persist(PersistenceConstants.FLASH)
>       private T bean;
>       
>       @Persist(PersistenceConstants.FLASH)
>       @Property
>       private boolean showOutput;
>       
>       
>       void onSubmitFromForm(){
>               showOutput = true;
>       }
>       
>       public T getBean(){
>                
>               if (bean == null){
>                   bean = createBean();
>                       
>               }
>               return bean;
>       }
>       
>       
>       protected T createBean(){
>               T newInstance = null;
>               
>                   try {
>                       Class<T> clazz = getBeanClass();
>                               newInstance =clazz.newInstance();
>                       } catch (InstantiationException e) {
>                               log.info(e);
>                               
>                       } catch (IllegalAccessException e) {
>                               log.info(e);
>                       }
>               
>           return newInstance;
>       }
>       
>       
>       protected abstract Class<T> getBeanClass();
> }
> {code}
> ------------
> {code}
> public class PageA extends BasePage<PageABean> {
>       @InjectComponent
>       private Zone modelZone;
>       @Property
>       @Persist
>       private List<String> availableModels;
>       
>       public Object onValueChanged(CarMaker maker) 
>     {
>        availableModels = findAvailableModels(maker);
>        
>        return modelZone.getBody();
>     }
>     
>     public List<String> findAvailableModels(final CarMaker maker) 
>     {
>       switch (maker) 
>       {
>          case AUDI:
>             return Arrays.asList("A4", "A6", "A8");
>          case BMW:
>             return Arrays.asList("3 Series", "5 Series", "7 Series");
>          case MERCEDES:
>             return Arrays.asList("C-Class", "E-Class", "S-Class");
>          default:
>             return Arrays.asList();
>        }
>     }
>     
>     
>       @Override
>       protected Class<PageABean> getBeanClass() {
>               return PageABean.class;
>       }
>       
> }
> {code}
> ----------------
> PageA.tml
> {code}
>      <t:form>
>       <p>
>          <t:errors />
>       </p>
>       <p>
>          Car Marker : <t:select t:id="carMaker" validate="required" 
> value="bean.carMaker"
>                    zone="modelZone" />
>       </p>
>       
>       <t:zone t:id="modelZone" id="modelZone">
>          <t:if test="bean.carMaker">
>            <p>
>               Model : <t:select t:id="carModel" model="availableModels" 
> validate="required" value="bean.model"/>
>            </p>
>          </t:if>
>       </t:zone>
>       
>       <p>
>          <t:submit value="literal:Submit" />
>       </p>
>    </t:form>
>      
>      <t:if test="showOutput">
>            Make = ${bean.carMaker} <br/>
>            model = ${bean.model}
>  
>      </t:if>
>     </body>
> {code}
> ----------------
> {code}
> public class PageABean extends BaseBean {
>       public enum CarMaker {
>               MERCEDES, AUDI, BMW;
>       }
>       
>       
>       private CarMaker carMaker;
>       
>       private String model;
>       
>       public String getModel() {              
>               return model;
>       }
>       public void setModel(String model) {
>               this.model = model;
>       }
>       public CarMaker getCarMaker() {
>               return carMaker;
>       }
>       public void setCarMaker(CarMaker carMaker) {
>               this.carMaker = carMaker;
>       }
> }
> {code}



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