3:21 a.m.
Hi,
While I really like Seam, sometimes it feels like I've just traded one set of problems
for another, that being conversation propagation. Almost every non-trivial web page
interaction causes some sort of problem for me.
Anyway, here's my current problem, and while I have found a workaround (which I'll
show at the end), I simply cannot understand WHY I need to do that. The problem is that I
get a "IllegalStateException: long-running conversation already active".
The application has a user type named Bidder. A bidder may submit one and only one bid to
the system. A bid consists of one or more bid items, which are price/volume pairs. Bidders
can always view their bid, and based on some business rules, the bidder may be able to
edit the bid or request a bid correction (which is an edit with approval).
From the bidder's home page, he can choose ViewBid, and from
ViewBid he can choose a link which directs him to ReqCorr (request correction). While in
ReqCorr he can edit a DataTable and, most importantly for this discussion, he can CANCEL
his edit.
ViewBid is managed by bidderViewBidManager (Stateful, CONVERSATION) but (in this use case)
does not start or end any conversations. ReqCof is managed by bidderBidCorrectionManager
(also Stateful, CONVERSATION). This conversation is started by an "s:link
propagation=begin" link on the ViewBid page, and ended either with a save() action or
the cancel() action.
This is the series of actions that cause the exception: ViewBid--link to
-->ReqCorr--action cancel()-->ViewBid--link to -->ReqCorr (boom!)
I have tried to provide this a simple ascii flowchart :) :
| Page View ConversationType CID
| ========= ================ ===
| Home New tmp 2
| |
| V
| ViewBid tmp 2
| |
| begin (via s:link)
| |
| V
| ReqCorr tmp prom. to long 4
| |
| end (cancel())
| |
| V
| ViewBid long dem. to tmp 4
| |
| begin (via s:link)
| |
| V
| ReqCorr IllegalStateEx. long-running conversation already active
|
The cid is taken from Live HTTP Headers in FireFox. This is the comlplete interaction
captured by Live HTTP Headers:
| http://localhost:8080/MyApp/home.jsf?cid=2
|
| GET /MyApp/home.jsf?cid=2 HTTP/1.1
| Host: localhost:8080
| User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.3) Gecko/20070309
Firefox/2.0.0.3
| Accept:
text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
| Accept-Language: en-us,en;q=0.8,sv;q=0.5,ar;q=0.3
| Accept-Encoding: gzip,deflate
| Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
| Keep-Alive: 300
| Connection: keep-alive
| Referer: http://localhost:8080/MyApp/home.jsf
| Cookie: redirectViewNumber=1,; JSESSIONID=349D78AD4B524645E6CD3F62500FBD21
|
| HTTP/1.x 200 OK
| Server: Apache-Coyote/1.1
| Cache-Control: must-revalidate
| Pragma: no-cache
| Expires: Thu, 01 Jan 1970 00:00:00 GMT
| Content-Type: text/html;charset=UTF-8
| Transfer-Encoding: chunked
| Date: Sat, 07 Apr 2007 07:20:00 GMT
| ----------------------------------------------------------
| http://localhost:8080/MyApp/restricted/bidderViewBid.jsf
|
| GET /MyApp/restricted/bidderViewBid.jsf HTTP/1.1
| Host: localhost:8080
| User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.3) Gecko/20070309
Firefox/2.0.0.3
| Accept:
text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
| Accept-Language: en-us,en;q=0.8,sv;q=0.5,ar;q=0.3
| Accept-Encoding: gzip,deflate
| Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
| Keep-Alive: 300
| Connection: keep-alive
| Referer: http://localhost:8080/MyApp/home.jsf?cid=2
| Cookie: redirectViewNumber=1,; JSESSIONID=349D78AD4B524645E6CD3F62500FBD21
|
| HTTP/1.x 200 OK
| Server: Apache-Coyote/1.1
| Cache-Control: must-revalidate
| Pragma: no-cache
| Expires: Thu, 01 Jan 1970 00:00:00 GMT
| Content-Type: text/html;charset=UTF-8
| Transfer-Encoding: chunked
| Date: Sat, 07 Apr 2007 07:20:05 GMT
| ----------------------------------------------------------
|
http://localhost:8080/MyApp/restricted/reqBidCorrection.jsf?bidId=950272&...
|
| GET
/MyApp/restricted/reqBidCorrection.jsf?bidId=950272&conversationPropagation=begin
HTTP/1.1
| Host: localhost:8080
| User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.3) Gecko/20070309
Firefox/2.0.0.3
| Accept:
text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
| Accept-Language: en-us,en;q=0.8,sv;q=0.5,ar;q=0.3
| Accept-Encoding: gzip,deflate
| Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
| Keep-Alive: 300
| Connection: keep-alive
| Referer: http://localhost:8080/MyApp/restricted/bidderViewBid.jsf
| Cookie: redirectViewNumber=1,; JSESSIONID=349D78AD4B524645E6CD3F62500FBD21
|
| HTTP/1.x 200 OK
| Server: Apache-Coyote/1.1
| Cache-Control: must-revalidate
| Pragma: no-cache
| Expires: Thu, 01 Jan 1970 00:00:00 GMT
| Content-Type: text/html;charset=UTF-8
| Transfer-Encoding: chunked
| Date: Sat, 07 Apr 2007 07:20:07 GMT
| ----------------------------------------------------------
| http://localhost:8080/MyApp/block/receive-send-updates
|
| POST /MyApp/block/receive-send-updates HTTP/1.1
| Host: localhost:8080
| User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.3) Gecko/20070309
Firefox/2.0.0.3
| Accept:
text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
| Accept-Language: en-us,en;q=0.8,sv;q=0.5,ar;q=0.3
| Accept-Encoding: gzip,deflate
| Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
| Keep-Alive: 300
| Connection: keep-alive
| Content-Type: application/x-www-form-urlencoded; charset=UTF-8
| Referer:
http://localhost:8080/MyApp/restricted/reqBidCorrection.jsf?bidId=950272&...
| Content-Length: 733
| Cookie: redirectViewNumber=1,; JSESSIONID=349D78AD4B524645E6CD3F62500FBD21
| Pragma: no-cache
| Cache-Control: no-cache
|
partial=false&ice.event.target=bidderReqCorrForm%3AbidItemsTable%3A0%3A_id52&ice.event.captured=bidderReqCorrForm%3AbidItemsTable%3A0%3A_id52&ice.event.type=onclick&ice.event.alt=false&ice.event.ctrl=false&ice.event.shift=false&ice.event.meta=false&ice.event.x=159&ice.event.y=363&ice.event.left=true&ice.event.right=false&=&bidderReqCorrForm=bidderReqCorrForm&icefacesCssUpdates=&viewNumber=1&icefacesID=moKDNfCx_bC5P8I-kPXRgA&cid=4&bidderReqCorrForm%3AreqBidCorrReason=dddd&focus_hidden_field=&bidderReqCorrForm%3A_ideventModel=&bidderReqCorrForm%3A_idcl=bidderReqCorrForm%3AbidItemsTable%3A0%3A_id52&focus=bidderReqCorrForm%3AbidItemsTable%3A0%3A_id52&icefacesID=moKDNfCx_bC5P8I-kPXRgA%2C&viewNumber=1%2C&rand=0.5697510197840187
|
|
| HTTP/1.x 200 OK
| Server: Apache-Coyote/1.1
| Content-Type: text/xml;charset=UTF-8
| Content-Length: 2396
| Date: Sat, 07 Apr 2007 07:20:10 GMT
| ----------------------------------------------------------
| http://localhost:8080/MyApp/block/receive-send-updates
|
| POST /MyApp/block/receive-send-updates HTTP/1.1
| Host: localhost:8080
| User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.3) Gecko/20070309
Firefox/2.0.0.3
| Accept:
text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
| Accept-Language: en-us,en;q=0.8,sv;q=0.5,ar;q=0.3
| Accept-Encoding: gzip,deflate
| Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
| Keep-Alive: 300
| Connection: keep-alive
| Content-Type: application/x-www-form-urlencoded; charset=UTF-8
| Referer:
http://localhost:8080/MyApp/restricted/reqBidCorrection.jsf?bidId=950272&...
| Content-Length: 824
| Cookie: redirectViewNumber=1,; JSESSIONID=349D78AD4B524645E6CD3F62500FBD21
| Pragma: no-cache
| Cache-Control: no-cache
|
partial=false&ice.event.target=bidderReqCorrForm%3AbidItemsTable%3A0%3A_id53&ice.event.captured=bidderReqCorrForm%3AbidItemsTable%3A0%3A_id53&ice.event.type=onclick&ice.event.alt=false&ice.event.ctrl=false&ice.event.shift=false&ice.event.meta=false&ice.event.x=330&ice.event.y=370&ice.event.left=true&ice.event.right=false&=&bidderReqCorrForm=&icefacesCssUpdates=&viewNumber=1&icefacesID=moKDNfCx_bC5P8I-kPXRgA&cid=&bidderReqCorrForm%3AreqBidCorrReason=dddd&bidderReqCorrForm%3AbidItemsTable%3A0%3A_id43=1000&bidderReqCorrForm%3AbidItemsTable%3A0%3A_id50=1000000000&focus_hidden_field=&bidderReqCorrForm%3A_ideventModel=&bidderReqCorrForm%3A_idcl=bidderReqCorrForm%3AbidItemsTable%3A0%3A_id53&focus=bidderReqCorrForm%3AbidItemsTable%3A0%3A_id53&icefacesID=moKDNfCx_bC5P8I-kPXRgA%2C&viewNumber=1%2C&rand=0.31415903347128993
|
|
| HTTP/1.x 200 OK
| Server: Apache-Coyote/1.1
| Content-Type: text/xml;charset=UTF-8
| Content-Length: 3058
| Date: Sat, 07 Apr 2007 07:20:17 GMT
| ----------------------------------------------------------
| http://localhost:8080/MyApp/block/receive-send-updates
|
| POST /MyApp/block/receive-send-updates HTTP/1.1
| Host: localhost:8080
| User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.3) Gecko/20070309
Firefox/2.0.0.3
| Accept:
text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
| Accept-Language: en-us,en;q=0.8,sv;q=0.5,ar;q=0.3
| Accept-Encoding: gzip,deflate
| Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
| Keep-Alive: 300
| Connection: keep-alive
| Content-Type: application/x-www-form-urlencoded; charset=UTF-8
| Referer:
http://localhost:8080/MyApp/restricted/reqBidCorrection.jsf?bidId=950272&...
| Content-Length: 659
| Cookie: redirectViewNumber=1,; JSESSIONID=349D78AD4B524645E6CD3F62500FBD21
| Pragma: no-cache
| Cache-Control: no-cache
|
partial=false&ice.event.target=bidderReqCorrForm%3AcancelBtn&ice.event.captured=bidderReqCorrForm%3AcancelBtn&ice.event.type=onclick&ice.event.alt=false&ice.event.ctrl=false&ice.event.shift=false&ice.event.meta=false&ice.event.x=114&ice.event.y=419&ice.event.left=true&ice.event.right=false&bidderReqCorrForm%3AcancelBtn=Cancel&bidderReqCorrForm=&icefacesCssUpdates=&viewNumber=1&icefacesID=moKDNfCx_bC5P8I-kPXRgA&cid=&bidderReqCorrForm%3AreqBidCorrReason=dddd&focus_hidden_field=&bidderReqCorrForm%3A_ideventModel=&bidderReqCorrForm%3A_idcl=&focus=bidderReqCorrForm%3AcancelBtn&icefacesID=moKDNfCx_bC5P8I-kPXRgA%2C&viewNumber=1%2C&rand=0.006728861660381558
|
|
| HTTP/1.x 200 OK
| Server: Apache-Coyote/1.1
| X-REDIRECT: /MyApp/restricted/bidderViewBid.jsf?bidId=950272&cid=4
| Content-Length: 1
| Date: Sat, 07 Apr 2007 07:20:19 GMT
| ----------------------------------------------------------
| http://localhost:8080/MyApp/restricted/bidderViewBid.jsf?bidId=950272&...
|
| GET /MyApp/restricted/bidderViewBid.jsf?bidId=950272&cid=4 HTTP/1.1
| Host: localhost:8080
| User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.3) Gecko/20070309
Firefox/2.0.0.3
| Accept:
text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
| Accept-Language: en-us,en;q=0.8,sv;q=0.5,ar;q=0.3
| Accept-Encoding: gzip,deflate
| Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
| Keep-Alive: 300
| Connection: keep-alive
| Referer:
http://localhost:8080/MyApp/restricted/reqBidCorrection.jsf?bidId=950272&...
| Cookie: redirectViewNumber=1,; redirectViewNumber=1,;
JSESSIONID=349D78AD4B524645E6CD3F62500FBD21
|
| HTTP/1.x 200 OK
| Server: Apache-Coyote/1.1
| Cache-Control: must-revalidate
| Pragma: no-cache
| Expires: Thu, 01 Jan 1970 00:00:00 GMT
| Content-Type: text/html;charset=UTF-8
| Transfer-Encoding: chunked
| Date: Sat, 07 Apr 2007 07:20:19 GMT
| ----------------------------------------------------------
|
http://localhost:8080/MyApp/restricted/reqBidCorrection.jsf?bidId=950272&...
|
| GET
/MyApp/restricted/reqBidCorrection.jsf?bidId=950272&conversationPropagation=begin
HTTP/1.1
| Host: localhost:8080
| User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.3) Gecko/20070309
Firefox/2.0.0.3
| Accept:
text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
| Accept-Language: en-us,en;q=0.8,sv;q=0.5,ar;q=0.3
| Accept-Encoding: gzip,deflate
| Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
| Keep-Alive: 300
| Connection: keep-alive
| Referer:
http://localhost:8080/MyApp/restricted/bidderViewBid.jsf?bidId=950272&...
| Cookie: redirectViewNumber=1,; redirectViewNumber=1,;
JSESSIONID=349D78AD4B524645E6CD3F62500FBD21
|
| HTTP/1.x 302 Moved Temporarily
| Server: Apache-Coyote/1.1
| Cache-Control: must-revalidate
| Pragma: no-cache
| Expires: Thu, 01 Jan 1970 00:00:00 GMT
| Location: http://localhost:8080/MyApp/debug.jsf?cid=4&clr=true
| Content-Length: 0
| Date: Sat, 07 Apr 2007 07:20:24 GMT
| ----------------------------------------------------------
| http://localhost:8080/MyApp/debug.jsf?cid=4&clr=true
|
| GET /MyApp/debug.jsf?cid=4&clr=true HTTP/1.1
| Host: localhost:8080
| User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.3) Gecko/20070309
Firefox/2.0.0.3
| Accept:
text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
| Accept-Language: en-us,en;q=0.8,sv;q=0.5,ar;q=0.3
| Accept-Encoding: gzip,deflate
| Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
| Keep-Alive: 300
| Connection: keep-alive
| Referer:
http://localhost:8080/MyApp/restricted/bidderViewBid.jsf?bidId=950272&...
| Cookie: redirectViewNumber=1,; JSESSIONID=349D78AD4B524645E6CD3F62500FBD21
|
| HTTP/1.x 200 OK
| Server: Apache-Coyote/1.1
| Cache-Control: must-revalidate
| Pragma: no-cache
| Expires: Thu, 01 Jan 1970 00:00:00 GMT
| Content-Type: text/html;charset=ISO-8859-1
| Transfer-Encoding: chunked
| Date: Sat, 07 Apr 2007 07:20:24 GMT
| ----------------------------------------------------------
|
pages.xml:
| <page view-id="/restricted/bidderViewBid.xhtml">
| <restrict>#{s:hasRole('Bidder')}</restrict>
| <param name="bidId" value="#{bidHome.id}"
converterId="javax.faces.Long"/>
|
| <navigation from-action="#{bidderViewBidManager.createBid}">
| <redirect view-id="/restricted/createBid.xhtml"/>
| </navigation>
|
| ...
| </page>
|
| <page view-id="/restricted/reqBidCorrection.xhtml">
| <restrict>#{s:hasPermission('bbrules', 'bidderRules',
'canReqCorrection')}</restrict>
| <param name="bidId" value="#{bidHome.id}"
converterId="javax.faces.Long"/>
| <navigation from-action="#{bidderBidCorrectionManager.save}">
| <redirect view-id="/restricted/bidderViewBid.xhtml"/>
| </navigation>
|
| <navigation
from-action="#{bidderBidCorrectionManager.cancel}">
| <redirect view-id="/restricted/bidderViewBid.xhtml"/>
| </navigation>
| </page>
|
|
Link in ViewBid:
| <s:link
value="#{messages.label_ReqBidCorrection}"
view="/restricted/reqBidCorrection.xhtml" propagation="begin">
| <f:param name="bidId"
value="#{bidHome.id}"/>
| </s:link>
|
And code in bidderBidCorrectionManager:
| @End
| public void cancel(){
| initCorrections();
| reason = null;
| dirty = false;
| }
|
Now, I ran this scenario with debug level logging and I see that in the restore view phase
when it is trying to display the second ReqCorr view (after the cancel), a cid parameter
is passed along:
[2007-04-07 10:44:19,296] DEBUG org.jboss.seam.core.Manager Found conversation id in
request parameter: 4
[2007-04-07 10:44:19,296] DEBUG org.jboss.seam.core.Manager Restoring conversation with
id: 4
However, reading through the Live HTTP Header log, I cannot see when or where this is
happening, and why should it? This conversation was ended two requests ago! Also, when a
temp. conv. is promoted to long running, does it get a new id? That would explain the
change in cid the first time I go into ReqCorr (cid 2 to 4).
Two workarounds I found. One is to @End(beforeRedirect=true) on the cancel method. Problem
with that is that when I go back again, I get that message "Conversation
ended...". If I want to, I can convince myself that this message makes sense, but to
a user? The other option is to change propagation=begin to propagation=join on the s:link.
This works, with no side effects. But I do not understand WHY I have to do that?
There must be something I'm missing here :)
P.S. Sorry about the formatting, cant figure that one out either, LOL
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