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 $o := db:add('testdb', <aaa/>, '111.xml') return <ok/> };
it will not work in the basex 8.4.2 i.e. the document is not added to
the
db, but it will return <ok/> without errors. On the contrary the db:add executed in the BaseX.jar client is working
well.
And also the above restxq code is working as expected in the basex 8.3.1 version.
Thank you in advance.
Regards, Vincenzo
Hi Vincenzo,
This looks like a classical stack overflow issue (the same would happen in Java). I am pretty sure it also happened with earlier releases of BaseX. To fix this, you’ll rewrite your query for tail recursion [1], use fold-left [2], or increase your Java stack trace with the -Xss flag [3].
Hope this helps, Christian
[1] https://en.wikipedia.org/wiki/Tail_call [2] http://docs.basex.org/wiki/Higher-Order_Functions#fn:fold-left [3] https://blogs.oracle.com/saas-fusion-app-performance/entry/how_set_stack_siz...
On Fri, Apr 8, 2016 at 2:37 PM, Vincenzo Cestone v.cestone@gmail.com wrote:
Thank you Christian,
I checked the issue of the subject with the latest release and now it is working. But the BaseX843-20160407 release introduces a different issue (supposedly), that is a java.lang.StackOverflowError exception you can reproduce implementing a restxq with a recursive function, as in the following example:
module namespace api = "urn:api";
declare function api:fact($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 $o := db:add('testdb', <aaa/>, '111.xml') return <ok/> };
it will not work in the basex 8.4.2 i.e. the document is not added to the db, but it will return <ok/> without errors. On the contrary the db:add executed in the BaseX.jar client is working well.
And also the above restxq code is working as expected in the basex 8.3.1 version.
Thank you in advance.
Regards, Vincenzo
Hi Christian, to give more details, I can tell you that with BaseX 8.4.2 doesn't happens. Moreover in the BaseX843-20160407 release happens even if I call the restxq with the 1 value: no recursion.
2016-04-08 14:42 GMT+02:00 Christian Grün christian.gruen@gmail.com:
Hi Vincenzo,
This looks like a classical stack overflow issue (the same would happen in Java). I am pretty sure it also happened with earlier releases of BaseX. To fix this, you’ll rewrite your query for tail recursion [1], use fold-left [2], or increase your Java stack trace with the -Xss flag [3].
Hope this helps, Christian
[1] https://en.wikipedia.org/wiki/Tail_call [2] http://docs.basex.org/wiki/Higher-Order_Functions#fn:fold-left [3] https://blogs.oracle.com/saas-fusion-app-performance/entry/how_set_stack_siz...
On Fri, Apr 8, 2016 at 2:37 PM, Vincenzo Cestone v.cestone@gmail.com wrote:
Thank you Christian,
I checked the issue of the subject with the latest release and now it is working. But the BaseX843-20160407 release introduces a different issue
(supposedly),
that is a java.lang.StackOverflowError exception you can reproduce implementing a restxq with a recursive function, as in the following example:
module namespace api = "urn:api";
declare function api:fact($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
Please provide me with some code that allows me to reproduce the problem. I have run your RESTXQ sample with the latest snapshot and 8.4.2, and this is what I get:
__ latest snapshot ___
curl "http://localhost:8984/myapi/1 <result>1</result>
curl "http://localhost:8984/myapi/3 <result>6</result>
curl "http://localhost:8984/myapi/300000" <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"/> <title>Error 400 Stopped at F:/webapp/x.xq, 11/10: [bxerr:BASX0005] Stack Overflow: Try tail recursion?</title> </head> ...
___ 8.4.2 ___
curl "http://localhost:8984/myapi/1 <result>1</result>
curl "http://localhost:8984/myapi/3 <result>6</result>
curl "http://localhost:8984/myapi/300000" <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"/> <title>Error 400 Stopped at C:/Users/user/Desktop/basex/webapp/x.xq, 11/10: [bxerr:BASX0005] Stack Overflow: Try tail recursion?</title> </head> ...
…the issue has been resolved, as confirmed by Vincenzo (thanks for the reply).
On Fri, Apr 8, 2016 at 3:09 PM, Christian Grün christian.gruen@gmail.com wrote:
Please provide me with some code that allows me to reproduce the problem. I have run your RESTXQ sample with the latest snapshot and 8.4.2, and this is what I get:
__ latest snapshot ___
curl "http://localhost:8984/myapi/1 <result>1</result>
curl "http://localhost:8984/myapi/3 <result>6</result>
curl "http://localhost:8984/myapi/300000"
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"/> <title>Error 400 Stopped at F:/webapp/x.xq, 11/10: [bxerr:BASX0005] Stack Overflow: Try tail recursion?</title> </head> ...
___ 8.4.2 ___
curl "http://localhost:8984/myapi/1 <result>1</result>
curl "http://localhost:8984/myapi/3 <result>6</result>
curl "http://localhost:8984/myapi/300000"
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"/> <title>Error 400 Stopped at C:/Users/user/Desktop/basex/webapp/x.xq, 11/10: [bxerr:BASX0005] Stack Overflow: Try tail recursion?</title> </head> ...
basex-talk@mailman.uni-konstanz.de
-
Christian Grün -
Vincenzo Cestone