Hi Vincenzo,

This looks like a classical stack overflow issue (the same would
happen in Java). I am pretty sure it also happened with earlier
releases of BaseX. To fix this, you’ll rewrite your query for tail
recursion [1], use fold-left [2], or increase your Java stack trace
with the -Xss flag [3].

Hope this helps,
Christian

[1] https://en.wikipedia.org/wiki/Tail_call
[2] http://docs.basex.org/wiki/Higher-Order_Functions#fn:fold-left
[3] https://blogs.oracle.com/saas-fusion-app-performance/entry/how_set_stack_size_to

On Fri, Apr 8, 2016 at 2:37 PM, Vincenzo Cestone <v.cestone@gmail.com> wrote:
> Thank you Christian,
>
> I checked the issue of the subject with the latest release and now it is
> working.
> But the BaseX843-20160407 release introduces a different issue (supposedly),
> that is a java.lang.StackOverflowError exception you can reproduce
> implementing a restxq with a recursive function, as in the following
> example:
> ---
> module namespace api = "urn:api";
>
> declare function api:fact($val) {
>   if ($val = 1) then 1
>   else $val * api:fact($val - 1)
> };
>
> declare
>   %rest:path('myapi/{$v}')
>   %rest:GET
> function api:impl_GET($v) {
>     <result>{api:fact($v)}</result>
> };
> ---
> Regards,
> Vincenzo
>
> 2016-04-06 15:48 GMT+02:00 Christian Grün <christian.gruen@gmail.com>:
>>
>> Il problema è risolto [1,2]; grazie di nuovo.
>>
>> [1] https://github.com/BaseXdb/basex/issues/1281
>> [2] http://files.basex.org/releases/latest/
>>
>>
>>
>> On Tue, Apr 5, 2016 at 12:53 PM, Christian Grün
>> <christian.gruen@gmail.com> wrote:
>> > Thanks Vincenzo,
>> >
>> > I could reproduce the problem [1], and we’ll fix it soon.
>> >
>> > Generally, I’d recommend you to avoid declaration of variables that
>> > will never be used. You could rewrite your code as follows:
>> >
>> >    db:add('testdb', <aaa/>, '111.xml'),
>> >    <ok/>
>> >
>> > Hope this helps,
>> > Christian
>> >
>> > [1] https://github.com/BaseXdb/basex/issues/1281
>> >
>> >
>> >
>> > On Mon, Apr 4, 2016 at 10:30 AM, Vincenzo Cestone <v.cestone@gmail.com>
>> > wrote:
>> >> Hi guys,
>> >>
>> >> in the new basex 8.4.2 version I cannot write on the db via restxq.
>> >>
>> >> For example if you create an empty 'testdb',
>> >> set in the .basex conf file the option MIXUPDATES = true,
>> >> and call the '/dbaddtest' restxq implemented as in the following:
>> >> ---
>> >> module namespace o = "test";
>> >>
>> >> declare
>> >>   %rest:path("/dbaddtest")
>> >>   %rest:GET
>> >> function o:dbaddtest() {
>> >>   let $o := db:add('testdb', <aaa/>, '111.xml')
>> >>   return <ok/>
>> >> };
>> >> ---
>> >> it will not work in the basex 8.4.2 i.e. the document is not added to
>> >> the
>> >> db, but it will return <ok/> without errors.
>> >> On the contrary the db:add executed in the BaseX.jar client is working
>> >> well.
>> >>
>> >> And also the above restxq code is working as expected in the basex
>> >> 8.3.1
>> >> version.
>> >>
>> >> Thank you in advance.
>> >>
>> >> Regards,
>> >> Vincenzo
>> >>
>> >>
>
>