Re: 3 days of ValueEncoder-ing, no coercion found

[Thiago H de Paula Figueiredo]

On Tue, 26 Feb 2013 00:45:51 -0300, mvchris ch...@mrvoip.com.au wrote:

Oh maan.  what an idiot.  That's a lesson in reading the stack  
trace carefully. Bad programmer.


It's normal to overlook stuff sometimes . . . :)


On looking back at the last message, line 31 just had a loop

qmEvents.get(i).getClass.getCanonicalName();

funnily enough as you suspected, the class name was not a
LibraryQueueMemberEvent.  It was a String from the database query return,
which is what I was checking for before I came to the list,  
half-gone-mad..


Damn, I forgot about that possibility. You may have a scalar query, so it  
returns a String and not an entity object.



Thiago, I am sorry to have wasted your time in the end as it was not a
tapestry error.


Don't worry. I prefer the feeling of having successfully helped someone. ;)

Noted, re nabble and eating stuff.  I just stopped using a dedicated  
desktop mail user agent


Gmail and Yahoo are nice and stuff but I still prefer an e-mail client.  
The Opera's built-in one is quite good and has an integrated RSS reader.


and nabble seems like a good tool for browsing.  Might have to re-work  
that workflow because I remember reading stripped

posts...frustrating thoughts...ah the karma


Nabble is good for browsing (I use it for reading and searching old  
stuff), not for posting. :)


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Re: 3 days of ValueEncoder-ing, no coercion found

[mvchris]

Oh maan.  what an idiot.  That's a lesson in reading the stack trace
carefully.  Bad programmer.

On looking back at the last message, line 31 just had a loop

qmEvents.get(i).getClass.getCanonicalName();

funnily enough as you suspected, the class name was not a
LibraryQueueMemberEvent.  It was a String from the database query return,
which is what I was checking for before I came to the list, half-gone-mad..

Thiago, I am sorry to have wasted your time in the end as it was not a
tapestry error.


Noted, re nabble and eating stuff.  I just stopped using a dedicated desktop
mail user agent and nabble seems like a good tool for browsing.  Might have
to re-work that workflow because I remember reading stripped
posts...frustrating thoughts...ah the karma

Kind Regards,
Chris



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Re: 3 days of ValueEncoder-ing, no coercion found

[mvchris]

Happy Friday Tapestry Users,

I've been stuck on this all week and really can't move because it's the last
part of my app :(
Then I'm done!!  But tapestry is not making it easy to finish.

My ValueEncoder is not getting recognised.

Here's a good summary of it.

1.  I use similar (if not the exact same) Object - T5 Page - T5 Template 
structure between 3 types of objects.

My objects are
  a)  CTIConfigurator
  b)  RTQProbe
  c)  LibraryQueueMemberEvent

And it works for a list of objects when all values in the DB are fetched
from business layer.  No need for a value encoder for the grid component on
these.

The page class looks like this for all of these types


And template



And this works.

I then use the same thing for a different object.  Using the grid for all
results and it works.


My problem exists when I fetch from the business layer a subset of all
objects of this type, and I get the coercion exception.  I don't know why
because it is still a list of objects.


So I make a ValueEncoder for LibraryQueueMemberEvent




And my AppModule has this added to use my ValueEncoder.


It is my only contributedValueEncoder.

I'm still getting a coercion exception on a subset of all
LibraryQueueMemberEvent objects, which are returned from EJB as a list.

The ValueEncoder is declared in the page and template, but somehow not
recognised.

The template


And the page class



There are no typos, I've gone over it with a fine toothed comb.
Help required :(
Thanks
Chris



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Re: 3 days of ValueEncoder-ing, no coercion found

[Thiago H de Paula Figueiredo]

On Fri, 22 Feb 2013 06:09:42 -0300, mvchris ch...@mrvoip.com.au wrote:


Happy Friday Tapestry Users,


Hi!

I've been stuck on this all week and really can't move because it's the  
last part of my app :(


I don't understand this thread. Really. We've noticed the problem is in a  
Loop. Now you post a template with only a Grid. I've suggested you to  
explicitly pass the ValueEncoder to the Loop's encoder parameter. I said  
it may be a problem with your persistence provider could have been  
returning entity subclasses in some cases. No response from you for both  
questions.


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Re: 3 days of ValueEncoder-ing, no coercion found

[mvchris]

Hi Thiago,

Thanks for the response, I wasn't aware the Loop/Grid thing was a big issue
- with either template it had been the same, passing the ValueEncoder.

However, since tidying up and gaining a better understanding, the no
coercion exception only appears on a grid - I made all my pages as similar
as possible for this problem since the start of the week to nut it out - so
my question is - how do i know my ValueEncoder is registered with tapestry
or is passed to the grid - since it clearly exists and has been contribtued? 
It's as though tapestry can't find it with the gridand I'm passing it.


Now with the loop component:
Same page class as the last message posted, with this template below, yields
cannot cast exception that follows.
So has my ValueEncoder created the coercion between
String-LibraryQueueMemberEvent ?
Yet java can't cast between the two for a weird reason?

In one hand (a grid) my value encoder is not recognised, and in the other (a
loop) the coercion has been recognised but at some other level java can't
cast between the two?









With regards to the persistence provider, in this case EclipseLink in
Glassfish - I have no idea about returning a subclass.

The session bean method is



Are you saying you've seen Hibernate return a subclass of
LibraryQueueMemberEvent - and how do you overcome that sort of behaviour?

Thanks for your frustrated reply. I _really_ appreciate your eyeballs on
this thread despite what appears my chopping and changing between Loop/Grid.

Chris



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Re: 3 days of ValueEncoder-ing, no coercion found

[Thiago H de Paula Figueiredo]

On Fri, 22 Feb 2013 17:17:10 -0300, mvchris ch...@mrvoip.com.au wrote:


Hi Thiago,


Hi!


However, since tidying up and gaining a better understanding, the no
coercion exception only appears on a grid - I made all my pages as  
similar as possible for this problem since the start of the week to nut  
it out - so my question is - how do i know my ValueEncoder is registered  
with tapestry or is passed to the grid - since it clearly exists and has  
been contribtued?


No every component gets a ValueEncoder automatically from  
ValueEncoderSource. Even for the ones who do, there may be situations in  
which ValueEncoderSource isn't enough.


It's as though tapestry can't find it with the gridand I'm passing  
it.


Contributing a ValueEncoder to ValueEncoderSource and passing one through  
a parameter are very different things and maybe you're thinking otherwise.  
When I ask you if you passed a ValueEncoder to a component, I'm asking  
about explicitly using the parameter, not contributing to  
ValueEncoderSource.



Now with the loop component:
Same page class as the last message posted, with this template below,  
yields cannot cast exception that follows.


Where's the exception? It seems Nabble ate it. By the way, guys, please  
avoid using Nabble.


So has my ValueEncoder created the coercion between  
String-LibraryQueueMemberEvent ?


No. ValueEncoderSource returns a TypeCoercer-backed ValueEncoder when no  
contributed one is found for the type.



Yet java can't cast between the two for a weird reason?


Cast anything that isn't a String to a String? This isn't expected in  
Java, a statically typed language, at all.


In one hand (a grid) my value encoder is not recognised, and in the  
other (a loop) the coercion has been recognised but at some other level  
java can't

cast between the two?


For the third or else time, have you checked the actual type of the  
objects returned by your persistence provider? They may be subclasses of  
your entities.



With regards to the persistence provider, in this case EclipseLink in
Glassfish - I have no idea about returning a subclass.

The session bean method is


Nabble ate it again. :( Anyway, it wouldn't help. You need to get the list  
and print the class name.


Please print the result of getClass().getName() for each of the


Are you saying you've seen Hibernate return a subclass of
LibraryQueueMemberEvent -


Yes.


and how do you overcome that sort of behaviour?


Explicitly providing a ValueEncoder (i.e through the encoder parameter  
parameter). I guess you're relying too much on contributions to  
ValueEncoderSource even when it's clearly not working.


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Re: 3 days of ValueEncoder-ing, no coercion found

[Thiago H de Paula Figueiredo]

Oops, now looking again at your post, now in Nabble, I've noticed  
something:


Caused by: java.lang.ClassCastException: java.lang.String cannot be cast  
to  
org.opencsta.ctiserver.library.asterisk.managerevents.model.LibraryQueueMemberEvent
at  
org.opencsta.eventviewer.pages.admin2.AgentStatusList.SetupRender(AgentStatusList.java:31)


What's in line 31 of AgentStatusList.SetupRender()? Full method source,  
please. Without looking at the source yet, it seems this isn't related to  
Tapestry.


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Re: 3 days of ValueEncoder-ing, no coercion found

[Thiago H de Paula Figueiredo]

On Wed, 20 Feb 2013 01:49:36 -0300, Chris Mylonas ch...@mrvoip.com.au  
wrote:



Hi Tapestry List, long time no hear...


Hi! Welcome back!


t:grid source=lmevents encoder=libEventEncoder row=lmevent
rowsPerPage=50 
p:empty
  pThere are no lmevents to display; you can add some
manually when the link is made./p
/p:empty
/t:grid


Have you checked in the Tapestry error page exactly where in your template  
this happens? I guess it's not related to Grid. As Taha said, there are  
some components that need a ValueEncoder but don't get one automatically.


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Re: 3 days of ValueEncoder-ing, no coercion found

[mvchris]

OK - I have some peculiar repeatable behaviour... (no use of value encoder
for testing and my findAll() works but smaller subset of results, still
ListLibraryEvent object used for source)


Whether I use a grid or a loop, my EJB findAll() method which returns all
records - it displays the records without a problem.
If I use my getDistinct() method, I get the no coercion error.

Both EJB  methods return ListLibraryEvent objects.

The findAll() returns 132 in the list, whereas the getDistinct() returns 3.
When calling findAll(), everything works.  getDistinct() though, no
coercion.

Any thoughts?

Thanks a lot
Chris

Here is the top of the stacktrace, but it looks like a normal can't find
coercion message:

[#|2013-02-20T23:47:48.276+1100|SEVERE|glassfish3.1.2|tapestry.render.org.opencsta.eventviewer.pages.AgentStatusList|_ThreadID=112;_ThreadName=Thread-2;|Render
queue error in BeginRender[AgentStatusList:loop]: Failure writing parameter
'value' of component AgentStatusList:loop: Could not find a coercion from
type java.lang.String to type au.com.mrvoip.libt5.model.LibraryEvent. 
   
org.apache.tapestry5.ioc.internal.util.TapestryException: Failure writing
parameter 'value' of component AgentStatusList:loop: Could not find a
coercion from type java.lang.String to type
au.com.mrvoip.libt5.model.LibraryEvent. [at classpath:
au/com/mrvoip/libt5/pages/AgentStatusList.tml, line 15]  



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Re: 3 days of ValueEncoder-ing, no coercion found

[mvchris]

Noted the use of DefaultProvider where grid's is optional.
And yes, I remember reading a million times not to do what I posted - thanks
for highlighting that!



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Re: 3 days of ValueEncoder-ing, no coercion found

[Thiago H de Paula Figueiredo]

On Wed, 20 Feb 2013 09:54:15 -0300, mvchris ch...@mrvoip.com.au wrote:


Whether I use a grid or a loop, my EJB findAll() method which returns all
records - it displays the records without a problem.
If I use my getDistinct() method, I get the no coercion error.


This may be related to the JPA implementation returning runtime-created  
subclasses of entity classes (in this case, LibraryEvent). I've seen  
Hibernate do that.



org.apache.tapestry5.ioc.internal.util.TapestryException: Failure writing
parameter 'value' of component AgentStatusList:loop: Could not find a
coercion from type java.lang.String to type
au.com.mrvoip.libt5.model.LibraryEvent. [at classpath:
au/com/mrvoip/libt5/pages/AgentStatusList.tml, line 15]


You had posted a Grid, but in fact your exception is happening in a Loop.  
Could you post the part of the template that declares this Loop instance?


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Re: 3 days of ValueEncoder-ing, no coercion found

[mvchris]

)
  
Caused by: org.apache.tapestry5.ioc.internal.util.TapestryException: Failure
writing parameter 'value' of component AgentStatusList:loop: Could not find
a coercion from type java.lang.String to type
org.opencsta.ctiserver.library.asterisk.managerevents.model.LibraryQueueMemberEvent.
[at classpath:org/opencsta/eventviewer/pages/AgentStatusList.tml, line 15]  
  
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl$AbstractPhase.invoke(ComponentPageElementImpl.java:153)

 
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl$BeginRenderPhase.render(ComponentPageElementImpl.java:209)

  
at
org.apache.tapestry5.internal.services.RenderQueueImpl.run(RenderQueueImpl.java:72)

... 87 more 
  
Caused by: org.apache.tapestry5.ioc.internal.util.TapestryException: Failure
writing parameter 'value' of component AgentStatusList:loop: Could not find
a coercion from type java.lang.String to type
org.opencsta.ctiserver.library.asterisk.managerevents.model.LibraryQueueMemberEvent.
[at classpath:org/opencsta/eventviewer/pages/AgentStatusList.tml, line 15]  
  
at
org.apache.tapestry5.internal.transform.ParameterWorker$3$1.writeToBinding(ParameterWorker.java:301)
   
at
org.apache.tapestry5.internal.transform.ParameterWorker$3$1.set(ParameterWorker.java:245)
  
at
org.apache.tapestry5.corelib.components.Loop.conduit_set_value(Loop.java)   
   
at org.apache.tapestry5.corelib.components.Loop.begin(Loop.java:386)
  
at
org.apache.tapestry5.corelib.components.Loop.beginRender(Loop.java) 
   
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl$BeginRenderPhase.invokeComponent(ComponentPageElementImpl.java:202)

 
at
org.apache.tapestry5.internal.structure.ComponentPageElementImpl$AbstractPhase.invoke(ComponentPageElementImpl.java:133)

 
... 89 more 
  
Caused by: org.apache.tapestry5.ioc.util.UnknownValueException: Could not
find a coercion from type java.lang.String to type
org.opencsta.ctiserver.library.asterisk.managerevents.model.LibraryQueueMemberEvent.
   
at
org.apache.tapestry5.ioc.internal.services.TypeCoercerImpl.findOrCreateCoercion(TypeCoercerImpl.java:316)
  
at
org.apache.tapestry5.ioc.internal.services.TypeCoercerImpl.access$000(TypeCoercerImpl.java:33)
 
at
org.apache.tapestry5.ioc.internal.services.TypeCoercerImpl$TargetCoercion.getCoercion(TypeCoercerImpl.java:89)
 
at
org.apache.tapestry5.ioc.internal.services.TypeCoercerImpl$TargetCoercion.coerce(TypeCoercerImpl.java:67)
  
at
org.apache.tapestry5.ioc.internal.services.TypeCoercerImpl.coerce(TypeCoercerImpl.java:146)

at $TypeCoercer_2c7f342cb3837.coerce(Unknown Source)
  
at
org.apache.tapestry5.internal.transform.ParameterWorker$3$1.writeToBinding(ParameterWorker.java:296)
   
... 95 more 
  
|



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Re: 3 days of ValueEncoder-ing, no coercion found

[mvchris]

nabble ate my template, hopefully the raw tag works.







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Re: 3 days of ValueEncoder-ing, no coercion found

[Thiago H de Paula Figueiredo]

On Wed, 20 Feb 2013 18:25:28 -0300, mvchris ch...@mrvoip.com.au wrote:


Hi Thiago et al,

Sure can, what follows is the template, page class, session bean,
implementation and entity with named queries.


You didn't explicitly provided a ValueEncoder to your source. Could you  
please try that?


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Re: 3 days of ValueEncoder-ing, no coercion found

[mvchris]

I took it out when doing my side-project testing.

The findAll() works without a ValueEncoder, yet the other query does not.
Here is a ValueEncoder I have used but no luck.

Why does findAll() work without a value encoder and the other one doesn't?
This part seems irregular.



/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package org.opencsta.eventviewer.encoders;

import javax.ejb.EJB;
import org.apache.tapestry5.ValueEncoder;
import org.apache.tapestry5.services.ValueEncoderFactory;
import
org.opencsta.ctiserver.library.asterisk.managerevents.model.LibraryQueueMemberEvent;
import
org.opencsta.ctiserver.library.asterisk.managerevents.session.LibraryQueueMemberEventFacadeLocal;

/**
 *
 * @author chrismylonas
 */
public class LibraryQueueMemberEventEncoder implements
ValueEncoderLibraryQueueMemberEvent,
ValueEncoderFactoryLibraryQueueMemberEvent {

private LibraryQueueMemberEventFacadeLocal _libraryQueueMemberService;

public LibraryQueueMemberEventEncoder(LibraryQueueMemberEventFacadeLocal
qmService) {
this._libraryQueueMemberService = qmService;

}

@Override
public String toClient(LibraryQueueMemberEvent v) {
return String.valueOf(v.getId());
}

@Override
public LibraryQueueMemberEvent toValue(String id) {
return _libraryQueueMemberService.find(Long.valueOf(id));
}

@Override
public ValueEncoderLibraryQueueMemberEvent
create(ClassLibraryQueueMemberEvent type) {
;//
}
}




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3 days of ValueEncoder-ing, no coercion found

[Chris Mylonas]

Hi Tapestry List, long time no hear...

How do you make tapestry spit out what encoder/coercions are supported.  My
encoder doesn't seem to be getting registered

I am writing an app and have had to use a ValueEncoder.  I don't know where
I am going wrong, I've written them before...and for the past 3 days get
the same stupid coercion message.

My understanding is
1.  Write encoder that implements ValueEncoder
2.  Contribute to value encoders
3.  encoder=myNewEncoder in the tapestry component to use where no
coercions come out-of-the-box

I have tried two alternatives and would like to know where I've gone wrong
in either please.

1.  Using Igor's Tapestry 5 book, I wrote a class called
LibraryEventEncoder and placed it in an uncontrolled package, it implements
ValueEncoder.

package au.com.mrvoip.t5app.encoders ;

public class LibraryEventEncoder implements ValueEncoderLibraryEvent {

private LibraryEventFacadeLocal _libraryEventService;

public LibraryEventEncoder(LibraryEventFacadeLocal libraryService) {
this._libraryEventService = libraryService;

}

@Override
public String toClient(LibraryEvent v) {
return String.valueOf(v.getId());
}

@Override
public LibraryEvent toValue(String id) {
return _libraryEventService.find(Long.valueOf(id));
}
}


AppModule receives this addition


@Contribute(ValueEncoderSource.class)
public static void provideEncoders(MappedConfigurationClass,
ValueEncoderFactoryconfiguration, final LibraryEventFacadeLocal lqmefl){
System.out.println(CHRIS THIS HAS BEEN CONTRIBUTED;
ValueEncoderFactoryLibraryEvent factory = new
ValueEncoderFactoryLibraryEvent(){
public ValueEncoderLibraryEvent create(ClassLibraryEvent
clazz){
return new LibraryEventEncoder(lqmefl);
}
};

configuration.add(LibraryEvent.class, factory);
}


My page class uses a simple grid and the template follows

@EJB
private LibraryEventFacadeLocal libraryService;
@Property
private LibraryEvent lmevent;

@Property
private LibraryEventEncoder libeventEncoder = new LibraryEventEncoder();

public ListLibraryEvent getLMEvents() {

return libraryService.getMostRecentDistinct(2720101); //returns a
short list (3-10 results usually)
}

public ValueEncoderLibraryQueueMemberEvent getLibEventEncoder(){
return libEventEncoder  ;
}



t:grid source=lmevents encoder=libEventEncoder row=lmevent
rowsPerPage=50 
p:empty
  pThere are no lmevents to display; you can add some
manually when the link is made./p
/p:empty
/t:grid




And the alternate way which appears to be popular - some private inner
class as a replacement, as well as something like this directly in the get
method.

public LibraryEventEncoder getLibEventEncoder() {
return new LibraryEventEncoder(lmService) {
public String toClient(LibraryEvent value) {
return String.valueOf(value.getId());
}

public LibraryEvent toValue(String clientValue) {
LibraryEvent e =
libEventService.find(Long.valueOf(clientValue));
if (String.valueOf(e.getId()).equals(clientValue)) {
return e;
}
return null;
}
};
}


But all the time I'm getting a problem with coercion of String to
LibraryEvent even with the System.out.println message being spat out of
logs that this encoder is being contributed (or at least i think it is)


Any pointers would be helpful
Chris

Re: 3 days of ValueEncoder-ing, no coercion found

[Taha Siddiqi]

Hi Chris

You have not shared the trace so I can't help you much but there are certain 
things I thought might help in general.

Contributing a ValueEncoder to a ValueEncoderSource only helps in components 
which use the ComponentDefaultProvider#defaultValueEncoder e.g. Select, Palette 
etc. For a Grid component, encoder is an optional parameter and does not use a 
default implementation. Thus in your case it is not in use.

As Thiago has pointed out a million times, NEVER EVER initialize a field inline 
in a component/page use setupRender()/onActivate()

Remember these are not solution to your problem, just suggestions. For a 
solution please share the full stack-trace :)

regards
Taha

On Feb 20, 2013, at 10:19 AM, Chris Mylonas wrote:

 Hi Tapestry List, long time no hear...
 
 How do you make tapestry spit out what encoder/coercions are supported.  My
 encoder doesn't seem to be getting registered
 
 I am writing an app and have had to use a ValueEncoder.  I don't know where
 I am going wrong, I've written them before...and for the past 3 days get
 the same stupid coercion message.
 
 My understanding is
 1.  Write encoder that implements ValueEncoder
 2.  Contribute to value encoders
 3.  encoder=myNewEncoder in the tapestry component to use where no
 coercions come out-of-the-box
 
 I have tried two alternatives and would like to know where I've gone wrong
 in either please.
 
 1.  Using Igor's Tapestry 5 book, I wrote a class called
 LibraryEventEncoder and placed it in an uncontrolled package, it implements
 ValueEncoder.
 
 package au.com.mrvoip.t5app.encoders ;
 
 public class LibraryEventEncoder implements ValueEncoderLibraryEvent {
 
private LibraryEventFacadeLocal _libraryEventService;
 
public LibraryEventEncoder(LibraryEventFacadeLocal libraryService) {
this._libraryEventService = libraryService;
 
}
 
@Override
public String toClient(LibraryEvent v) {
return String.valueOf(v.getId());
}
 
@Override
public LibraryEvent toValue(String id) {
return _libraryEventService.find(Long.valueOf(id));
}
 }
 
 
 AppModule receives this addition
 
 
@Contribute(ValueEncoderSource.class)
public static void provideEncoders(MappedConfigurationClass,
 ValueEncoderFactoryconfiguration, final LibraryEventFacadeLocal lqmefl){
System.out.println(CHRIS THIS HAS BEEN CONTRIBUTED;
ValueEncoderFactoryLibraryEvent factory = new
 ValueEncoderFactoryLibraryEvent(){
public ValueEncoderLibraryEvent create(ClassLibraryEvent
 clazz){
return new LibraryEventEncoder(lqmefl);
}
};
 
configuration.add(LibraryEvent.class, factory);
}
 
 
 My page class uses a simple grid and the template follows
 
@EJB
private LibraryEventFacadeLocal libraryService;
@Property
private LibraryEvent lmevent;
 
@Property
private LibraryEventEncoder libeventEncoder = new LibraryEventEncoder();
 
public ListLibraryEvent getLMEvents() {
 
return libraryService.getMostRecentDistinct(2720101); //returns a
 short list (3-10 results usually)
}
 
public ValueEncoderLibraryQueueMemberEvent getLibEventEncoder(){
return libEventEncoder  ;
}
 
 
 
t:grid source=lmevents encoder=libEventEncoder row=lmevent
 rowsPerPage=50 
p:empty
  pThere are no lmevents to display; you can add some
 manually when the link is made./p
/p:empty
/t:grid
 
 
 
 
 And the alternate way which appears to be popular - some private inner
 class as a replacement, as well as something like this directly in the get
 method.
 
public LibraryEventEncoder getLibEventEncoder() {
return new LibraryEventEncoder(lmService) {
public String toClient(LibraryEvent value) {
return String.valueOf(value.getId());
}
 
public LibraryEvent toValue(String clientValue) {
LibraryEvent e =
 libEventService.find(Long.valueOf(clientValue));
if (String.valueOf(e.getId()).equals(clientValue)) {
return e;
}
return null;
}
};
}
 
 
 But all the time I'm getting a problem with coercion of String to
 LibraryEvent even with the System.out.println message being spat out of
 logs that this encoder is being contributed (or at least i think it is)
 
 
 Any pointers would be helpful
 Chris

Re: 3 days of ValueEncoder-ing, no coercion found

[Chris Mylonas]

Excuse me, the contribute method in the previous email was not the one used
for coercion errors.

It should have looked like this


public static void contributeValueEncoderSource(
MappedConfigurationClassLibraryEvent,
ValueEncoderFactoryLibraryEvent configuration) {
configuration.addInstance(LibraryEvent.class, LibraryEncoder.class);
}


and with this one I just implemented the method required for implementing
the ValueEncoderFactory on my encoder.




On Wed, Feb 20, 2013 at 3:49 PM, Chris Mylonas ch...@mrvoip.com.au wrote:

 Hi Tapestry List, long time no hear...

 How do you make tapestry spit out what encoder/coercions are supported.
 My encoder doesn't seem to be getting registered

 I am writing an app and have had to use a ValueEncoder.  I don't know
 where I am going wrong, I've written them before...and for the past 3 days
 get the same stupid coercion message.

 My understanding is
 1.  Write encoder that implements ValueEncoder
 2.  Contribute to value encoders
 3.  encoder=myNewEncoder in the tapestry component to use where no
 coercions come out-of-the-box

 I have tried two alternatives and would like to know where I've gone wrong
 in either please.

 1.  Using Igor's Tapestry 5 book, I wrote a class called
 LibraryEventEncoder and placed it in an uncontrolled package, it implements
 ValueEncoder.

 package au.com.mrvoip.t5app.encoders ;

 public class LibraryEventEncoder implements ValueEncoderLibraryEvent {

 private LibraryEventFacadeLocal _libraryEventService;

 public LibraryEventEncoder(LibraryEventFacadeLocal libraryService) {
 this._libraryEventService = libraryService;

 }

 @Override
 public String toClient(LibraryEvent v) {
 return String.valueOf(v.getId());
 }

 @Override
 public LibraryEvent toValue(String id) {
 return _libraryEventService.find(Long.valueOf(id));
 }
 }


 AppModule receives this addition


 @Contribute(ValueEncoderSource.class)
 public static void provideEncoders(MappedConfigurationClass,
 ValueEncoderFactoryconfiguration, final LibraryEventFacadeLocal lqmefl){
 System.out.println(CHRIS THIS HAS BEEN CONTRIBUTED;
 ValueEncoderFactoryLibraryEvent factory = new
 ValueEncoderFactoryLibraryEvent(){
 public ValueEncoderLibraryEvent create(ClassLibraryEvent
 clazz){
 return new LibraryEventEncoder(lqmefl);
 }
 };

 configuration.add(LibraryEvent.class, factory);
 }


 My page class uses a simple grid and the template follows

 @EJB
 private LibraryEventFacadeLocal libraryService;
 @Property
 private LibraryEvent lmevent;

 @Property
 private LibraryEventEncoder libeventEncoder = new
 LibraryEventEncoder();

 public ListLibraryEvent getLMEvents() {

 return libraryService.getMostRecentDistinct(2720101); //returns
 a short list (3-10 results usually)
 }

 public ValueEncoderLibraryQueueMemberEvent getLibEventEncoder(){
 return libEventEncoder  ;
 }



 t:grid source=lmevents encoder=libEventEncoder row=lmevent
 rowsPerPage=50 
 p:empty
   pThere are no lmevents to display; you can add some
 manually when the link is made./p
 /p:empty
 /t:grid




 And the alternate way which appears to be popular - some private inner
 class as a replacement, as well as something like this directly in the get
 method.

 public LibraryEventEncoder getLibEventEncoder() {
 return new LibraryEventEncoder(lmService) {
 public String toClient(LibraryEvent value) {
 return String.valueOf(value.getId());
 }

 public LibraryEvent toValue(String clientValue) {
 LibraryEvent e =
 libEventService.find(Long.valueOf(clientValue));
 if (String.valueOf(e.getId()).equals(clientValue)) {
 return e;
 }
 return null;
 }
 };
 }


 But all the time I'm getting a problem with coercion of String to
 LibraryEvent even with the System.out.println message being spat out of
 logs that this encoder is being contributed (or at least i think it is)


 Any pointers would be helpful
 Chris




-- 

-- sent from web mail --

Re: 3 days of ValueEncoder-ing, no coercion found

[mvchris]

Thanks for the pointers Taha - interesting that those ValueEncoders have
slightly different behaviours depending 
Let me get some traces with a smaller sample project to try and help my
cause.

It's my first tapestry project in nearly a year!



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