You're saying that there is a difference in behavior between an expression to-spec and a query to-spec. The example you provided looks the same semantically and only differs in syntax. My suggestion is to produce a simpler test case that shows this behavior and submit it as a bug if it still fails.
The use of the forEach below (and the expressionLanguage attributes and CDATA nodes) is overly complicated. You may also be running into a subtle issue (possibly still an open bug) with the use of the forEach counter variable within a predicate. I believe you need to wrap the variable usage within a number() function. I'm also assuming that the forEach below was only a portion of your actual process and that you're doing something more than iterating over assigns with a forEach. For example, you probably have an invoke somewhere in the real code. While the snippet below is valid BPEL (at least at a quick glance) it's not a good use case for the forEach. The code below would be better accomplished in an Xquery FLWOR expression. Again - apologies if it's just to illustrate the bug - just mentioning it in case it was the real thing. On 4/13/09 11:33 AM, "Jonathan Coogan" <[email protected]> wrote: I'm still stuck on this. Does anyone have any suggestions? Should I write a bug report? Thank you. -Jon On 4/7/09 10:30 AM, "Jon Coogan" <[email protected]> wrote: > Here is a similar scenario that doesn't work in either 1.2 or 1.X. In > this example I iterate over record set and copy each record to an > intermediate temp variable. Then I assign from the temp variable to the > output variable. The process should return the value from the last > record. > > The problem occurs when copying from the dataset to the temporary > variable. If I use a query on the "to" side it won't work. Expressions > do work. (Look for inline comments below.) > > > <bpws:forEach counterName="Counter" name="ForEach" parallel="no"> > <bpws:startCounterValue > expressionLanguage="urn:oasis:names:tc:wsbpel:2.0:sublang:xpath2.0"><![C > DATA[1]]></bpws:startCounterValue> > <bpws:finalCounterValue > expressionLanguage="urn:oasis:names:tc:wsbpel:2.0:sublang:xpath2.0"><![C > DATA[count($Data/ns0:Record)]]></bpws:finalCounterValue> > <bpws:scope> > <bpws:sequence name="Sequence"> > <bpws:assign name="AssignToTempVariable" validate="no"> > <bpws:copy> > <bpws:from> > <!-- Initialize temp variable. --> > <bpws:literal> > <tns:Record xmlns:tns="recordsnamespace" > xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; > xsi:schemaLocation="recordsnamespace records.xsd "> > <tns:SomeValue/> > <tns:AnotherValue/> > </tns:Record> > </bpws:literal> > </bpws:from> > <bpws:to variable="TempRecord"/> > </bpws:copy> > > > <!-- ********** This does not work. ********** --> > > <bpws:copy> > <bpws:from variable="Data"> > <bpws:query > queryLanguage="urn:oasis:names:tc:wsbpel:2.0:sublang:xpath2.0"><![CDATA[ > ns0:Record[$Counter]/ns0:SomeValue]]></bpws:query> > </bpws:from> > <bpws:to variable="TempRecord"> > <bpws:query > queryLanguage="urn:oasis:names:tc:wsbpel:2.0:sublang:xpath2.0"><![CDATA[ > ns0:SomeValue]]></bpws:query> > </bpws:to> > </bpws:copy> > <bpws:copy> > <bpws:from variable="Data"> > <bpws:query > queryLanguage="urn:oasis:names:tc:wsbpel:2.0:sublang:xpath2.0"><![CDATA[ > ns0:Record[$Counter]/ns0:AnotherValue]]></bpws:query> > </bpws:from> > <bpws:to variable="TempRecord"> > <bpws:query > queryLanguage="urn:oasis:names:tc:wsbpel:2.0:sublang:xpath2.0"><![CDATA[ > ns0:AnotherValue]]></bpws:query> > </bpws:to> > </bpws:copy> > > <!-- ********** This does work. ********** --> > > <bpws:copy> > <bpws:from variable="Data"> > <bpws:query > queryLanguage="urn:oasis:names:tc:wsbpel:2.0:sublang:xpath2.0"><![CDATA[ > ns0:Record[$Counter]/ns0:SomeValue]]></bpws:query> > </bpws:from> > <bpws:to > expressionLanguage="urn:oasis:names:tc:wsbpel:2.0:sublang:xpath2.0"><![C > DATA[$TempRecord/ns0:SomeValue]]></bpws:to> > </bpws:copy> > <bpws:copy> > <bpws:from variable="Data"> > <bpws:query > queryLanguage="urn:oasis:names:tc:wsbpel:2.0:sublang:xpath2.0"><![CDATA[ > ns0:Record[$Counter]/ns0:AnotherValue]]></bpws:query> > </bpws:from> > <bpws:to > expressionLanguage="urn:oasis:names:tc:wsbpel:2.0:sublang:xpath2.0"><![C > DATA[$TempRecord/ns0:AnotherValue]]></bpws:to> > </bpws:copy> > > > </bpws:assign> > <bpws:assign name="AssignToOutput" validate="no"> > <bpws:copy> > <bpws:from variable="TempRecord"> > <bpws:query > queryLanguage="urn:oasis:names:tc:wsbpel:2.0:sublang:xpath2.0"><![CDATA[ > ns0:AnotherValue]]></bpws:query> > </bpws:from> > <bpws:to part="payload" variable="output"/> > </bpws:copy> > </bpws:assign> > </bpws:sequence> > </bpws:scope> > </bpws:forEach> > > -----Original Message----- > From: Jonathan Coogan [mailto:[email protected]] > Sent: Tuesday, April 07, 2009 9:56 AM > To: [email protected]; [email protected] > Subject: RE: Problem with query expressions > > Hello. I have confirmed that using a relative query fixes the problem > in my Ode 1.X build, but this still does not work for me in Ode 1.2. > After switching to a relative query I am no longer getting a selection > failure, but the process is returning erroneous output. It returns the > entire dataset instead of just the element I was trying to query. > > <bpws:forEach counterName="Counter" name="ForEach" parallel="no"> > <bpws:startCounterValue > expressionLanguage="urn:oasis:names:tc:wsbpel:2.0:sublang:xpath2.0"><![C > DATA[1]]></bpws:startCounterValue> > <bpws:finalCounterValue > expressionLanguage="urn:oasis:names:tc:wsbpel:2.0:sublang:xpath2.0"><![C > DATA[count($Data/ns0:Record)]]></bpws:finalCounterValue> > <bpws:scope> > <bpws:assign validate="no"> > > <!-- This does not work in Ode 1.2 but it does work in Ode 1.X --> > <bpws:copy> > <bpws:from variable="Data"> > <bpws:query > queryLanguage="urn:oasis:names:tc:wsbpel:2.0:sublang:xpath2.0"><![CDATA[ > ns0:Record[$Counter]/ns0:AnotherValue]]></bpws:query> > </bpws:from> > <bpws:to part="payload" variable="output"/> > </bpws:copy> > > <!-- This works.. --> > <bpws:copy> > <bpws:from > expressionLanguage="urn:oasis:names:tc:wsbpel:2.0:sublang:xpath2.0"><![C > DATA[$Data/ns0:Record[$Counter]/ns0:AnotherValue]]></bpws:from> > <bpws:to part="payload" variable="output"/> > </bpws:copy> > > </bpws:assign> > </bpws:scope> > </bpws:forEach> > > Is there something else I could be missing? > > Thanks. > -Jon > > -----Original Message----- > From: Matthieu Riou [mailto:[email protected]] > Sent: Friday, April 03, 2009 8:07 AM > To: [email protected] > Subject: Re: Problem with query expressions > > On Thu, Apr 2, 2009 at 2:46 PM, Jonathan Coogan < > [email protected]> wrote: > >> Hi. I'm having a problem when copying data from one variable to >> another within a forEach loop. When I use a query to copy data out of > >> a variable I get a selection failure fault at runtime. This works >> correctly when I copy from an expression instead of a query. >> >> I have attached an example that demonstrates the problem. The >> expected output of the attached BPEL process is the string "five". It > >> works correctly when using an expression, but fails when using a >> query. Here is the relevant snippet: >> > > BPEL assignment doesn't provide any context node to the XPath engine, > everything is always relative to a variable. Which means that your query > should be relative and not absolute. > > Matthieu > > >> >> <bpws:forEach counterName="Counter" name="ForEach" parallel="no"> >> <bpws:startCounterValue >> > expressionLanguage="urn:oasis:names:tc:wsbpel:2.0:sublang:xpath2.0"><![C > DATA[1]]></bpws:startCounterValue> >> <bpws:finalCounterValue >> > expressionLanguage="urn:oasis:names:tc:wsbpel:2.0:sublang:xpath2.0"><![C > DATA[count($Data/ns0:Record)]]></bpws:finalCounterValue> >> <bpws:scope> >> <bpws:assign validate="no"> >> <bpws:copy> >> <!-- >> ---------------------------------------------------------------------- >> ------ >> --> >> <!-- This generates a selection failure at runtime. --> >> <bpws:from variable="Data"> >> <bpws:query >> > queryLanguage="urn:oasis:names:tc:wsbpel:2.0:sublang:xpath2.0"><![CDATA[ > /ns0:Record[$Counter]/ns0:SomeValue]]></bpws:query> >> </bpws:from> >> >> <!-- This works. --> >> <!-- <bpws:from >> expressionLanguage="urn:oasis:names:tc:wsbpel:2.0:sublang:xpath2.0"><! >> [CDATA[$Data/ns0:Record[$Counter]/ns0:SomeValue]]></bpws:from> >> --> >> <!-- >> ---------------------------------------------------------------------- >> ------ >> --> >> >> <bpws:to part="payload" variable="output"/> >> </bpws:copy> >> </bpws:assign> >> </bpws:scope> >> </bpws:forEach> >> >> I have tested this with Ode 1.2 and a recent build of Ode 1.X and both > >> behave the same. Can someone tell me if I am doing something wrong? >> Or should I write a bug report for this? >> >> Thanks for your time. >> -Jon >>
