Hi Geert,
Yeah, I tried it with an empty bean; no luck.
Upon further inspection (read it's no longer 2:30AM :) the clonable
errors seem to be happening independent of the instance of the Venue
object but inside the template processing somewhere due to the List<>
I am passing to selectListHelper. The cookbook page(s) don't state
anywhere that you need to implement a cloneable list or Iterator...
so I guess it could be that something changed between the time the
cookbook entry was written and now (I'm using the Rife-1.5.1 jar)...
Is there a better way to implements dynamic SELECTs coming say in 1.6
(hint, hint :) as its really a useful feature and quite common in
forms (wink, wink, nudge, nudge :) ..?
Anyway, here's what I get:
com.uwyn.rife.engine.exceptions.EngineException
com.uwyn.rife.engine.exceptions.ElementLocalVariableUncloneableException
: The implementation 'com.zeitgeist.nela.implementations.AddVenue' of
element uses a local method variable of type 'java.util.AbstractList
$Itr' which is not cloneable.
at com.uwyn.rife.engine.RequestState getContinuationContext
( RequestState.java : 151 )
at com.uwyn.rife.engine.RequestState getElementContext
( RequestState.java : 228 )
at com.uwyn.rife.engine.RequestState service
( RequestState.java : 335 )
at com.uwyn.rife.engine.Gate handleRequest ( Gate.java : 421 )
at sun.reflect.GeneratedMethodAccessor10 invoke ( <unknown> )
at sun.reflect.DelegatingMethodAccessorImpl invoke
( DelegatingMethodAccessorImpl.java : 25 )
at java.lang.reflect.Method invoke ( Method.java : 585 )
at com.uwyn.rife.servlet.RifeFilter doFilter
( RifeFilter.java : 142 )
at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain
doFilter ( WebApplicationHandler.java : 823 )
at org.mortbay.jetty.servlet.WebApplicationHandler dispatch
( WebApplicationHandler.java : 473 )
at org.mortbay.jetty.servlet.ServletHandler handle
( ServletHandler.java : 567 )
at org.mortbay.http.HttpContext handle ( HttpContext.java :
1565 )
at org.mortbay.jetty.servlet.WebApplicationContext handle
( WebApplicationContext.java : 635 )
at org.mortbay.http.HttpContext handle ( HttpContext.java :
1517 )
at org.mortbay.http.HttpServer service ( HttpServer.java : 954
)
at org.mortbay.http.HttpConnection service
( HttpConnection.java : 814 )
at org.mortbay.http.HttpConnection handleNext
( HttpConnection.java : 981 )
4 more ...
com.uwyn.rife.engine.exceptions.ElementLocalVariableUncloneableException
The implementation 'com.zeitgeist.nela.implementations.AddVenue' of
element uses a local method variable of type 'java.util.AbstractList
$Itr' which is not cloneable.
at com.uwyn.rife.engine.ContinuationContext clone
( ContinuationContext.java : 408 )
at com.uwyn.rife.engine.ContinuationManager cloneContext
( ContinuationManager.java : 221 )
at com.uwyn.rife.engine.ContinuationManager createNewContext
( ContinuationManager.java : 161 )
at com.uwyn.rife.engine.RequestState getContinuationContext
( RequestState.java : 147 )
at com.uwyn.rife.engine.RequestState getElementContext
( RequestState.java : 228 )
at com.uwyn.rife.engine.RequestState service
( RequestState.java : 335 )
at com.uwyn.rife.engine.Gate handleRequest ( Gate.java : 421 )
at sun.reflect.GeneratedMethodAccessor10 invoke ( <unknown> )
at sun.reflect.DelegatingMethodAccessorImpl invoke
( DelegatingMethodAccessorImpl.java : 25 )
at java.lang.reflect.Method invoke ( Method.java : 585 )
at com.uwyn.rife.servlet.RifeFilter doFilter
( RifeFilter.java : 142 )
at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain
doFilter ( WebApplicationHandler.java : 823 )
at org.mortbay.jetty.servlet.WebApplicationHandler dispatch
( WebApplicationHandler.java : 473 )
at org.mortbay.jetty.servlet.ServletHandler handle
( ServletHandler.java : 567 )
at org.mortbay.http.HttpContext handle ( HttpContext.java :
1565 )
at org.mortbay.jetty.servlet.WebApplicationContext handle
( WebApplicationContext.java : 635 )
at org.mortbay.http.HttpContext handle ( HttpContext.java :
1517 )
7 more ...
java.lang.CloneNotSupportedException
java.util.AbstractList$Itr
at com.uwyn.rife.tools.ObjectUtils deepClone
( ObjectUtils.java : 233 )
at com.uwyn.rife.engine.ContinuationStack clone
( ContinuationStack.java : 365 )
at com.uwyn.rife.engine.ContinuationContext clone
( ContinuationContext.java : 403 )
at com.uwyn.rife.engine.ContinuationManager cloneContext
( ContinuationManager.java : 221 )
at com.uwyn.rife.engine.ContinuationManager createNewContext
( ContinuationManager.java : 161 )
at com.uwyn.rife.engine.RequestState getContinuationContext
( RequestState.java : 147 )
at com.uwyn.rife.engine.RequestState getElementContext
( RequestState.java : 228 )
at com.uwyn.rife.engine.RequestState service
( RequestState.java : 335 )
at com.uwyn.rife.engine.Gate handleRequest ( Gate.java : 421 )
at sun.reflect.GeneratedMethodAccessor10 invoke ( <unknown> )
at sun.reflect.DelegatingMethodAccessorImpl invoke
( DelegatingMethodAccessorImpl.java : 25 )
at java.lang.reflect.Method invoke ( Method.java : 585 )
at com.uwyn.rife.servlet.RifeFilter doFilter
( RifeFilter.java : 142 )
at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain
doFilter ( WebApplicationHandler.java : 823 )
at org.mortbay.jetty.servlet.WebApplicationHandler dispatch
( WebApplicationHandler.java : 473 )
at org.mortbay.jetty.servlet.ServletHandler handle
( ServletHandler.java : 567 )
at org.mortbay.http.HttpContext handle ( HttpContext.java :
1565 )
9 more ...
On Jan 4, 2007, at 4:35 AM, Geert Bevin wrote:
Hi David,
I never used this helper class, but it seems to me that you can
create a new Venue object when the element is instantiated (private
Venue mVenue = new Venue();). This will be your 'starting state',
ie. an empty bean instance.
Also, I'm wondering which errors you get exactly about non-clonable
objects. I suppose it's for the Venue instances. When using
continuations, RIFE has to be able to clone your state for each
continuation step for the back button to work correctly.
You have several options here:
* you don't care about the back button snapping back to previous state
Then you can just use setCloneContinuations(false) in your element,
or override the cloneContinuations() method to return false.
* you want to carry around some state in between continuation steps
(for example the venue data that they're filling in)
You can then implement the clone() method of your element and
preserve the current venue instance for each clone, you can find an
example of this here: http://rifers.org/08_advanced_continuations/
src/==%20syntax%20highlighted%20==/Order.java.html
Note that you'll then probably use fillSubmissionBean when the data
of each step comes in and not getSubmissionBean. This goes together
well with the empty bean instance suggestion I made at the start of
this message. It's also perfect to use with stepBack continuations.
* you want to clone each individual venue instance for the
corresponding continuations
You'll have to implement the clone method of the Venue class.
Chances are though that you can use the standard Object clone
method that the JDK provides which creates a shallow copy and is
perfect for the immutable basic Java types.
protected Object clone() throws CloneNotSupportedException {
Venue new_venue = (Venue)super.clone();
return new_venue;
}
When you have more complex data structures (collections, maps,
arrays, ...), the ObjectUtils.deepClone method will allow you to
create deep copies of most of the typical types that you use as
bean properties.
Hope this helps.
Geert
I've been trying to follow the recipe for creating the dynamic
select elements (http://tinyurl.com/y4ssym) but there's something
I'm not understanding... the selectListHelper method wants the
bean with the
item to be the select target ("item" in the example) as part of
its argument list ... which would need to be already populated ...
which would mean that the form would already be posted so that
getSubmissionBean() would have to have been called already so as
to have a non-null bean to pass to selectListHelper().
--
Geert Bevin
Uwyn "Use what you need" - http://uwyn.com
RIFE Java application framework - http://rifers.org
Music and words - http://gbevin.com
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------------------------------------------------------------------------
-------------------
David HM Spector
spector (at) zeitgeist.com
http://www.zeitgeist.com/
voice: +1 631.261.5013 fax:
+1 212.656.1443
~ ~ ~
"New and stirring things are belittled because if they are not
belittled, the
humiliating question arises, 'Why then are you not taking part in
them?'"
--H. G. Wells
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