I get: Unknown function: fn:stack-trace() when I use stack-trace(). I am not sure if this is meant as the equivalent of the stack trace where the error occured. This is what I got in the next catch block which might be anywhere, in my case in an unrelated module that implements a catch all and report functionality.

Am 11.01.2024 um 12:19 schrieb Martin Honnen:

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Am 11.01.2024 um 12:15 schrieb Omar Siam Omar.Siam@oeaw.ac.at:

Hi,

Until 10.6 one could find the stack trace of an error in $err:additional. This feature is now gone from BaseX and the documentation.

I made my life much easier with reporting stack traces on errors in RestXQ endpoints. Now I don't see how to get that information anymore.

Any advice how to get this functionality back?

It might be that https://qt4cg.org/specifications/xpath-functions-40/Overview.html#func-stack... already supported (but I haven´t checked).

I think stack traces were removed in this commit from basex-core/src/main/java/org/basex/query/expr/Catch.java

Revision: fc2376f6c9c250babfac7a7161b8a61740878b2b Author: Christian Grün cg@basex.org Date: 17.05.2023 11:25:01 Message: [XQ4] try/catch, $err:map

---- Modified: basex-api/src/main/java/org/basex/http/restxq/RestXqFunction.java Modified: basex-core/src/main/java/org/basex/query/QueryParser.java Modified: basex-core/src/main/java/org/basex/query/expr/Catch.java Modified: basex-core/src/test/java/org/basex/query/expr/XQuery4Test.java

line 141 ->  151 qe.getMessage() is now replaced with an Empty.VALUE const.

Am 11.01.2024 um 12:39 schrieb Martin Honnen:

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Am 11.01.2024 um 12:37 schrieb Omar Siam Omar.Siam@oeaw.ac.at:

I get: Unknown function: fn:stack-trace() when I use stack-trace().

Ah, sorry, it looks like it is not yet implemented. Wait for Christian to give you hopefully some better info than my ill guess.

Hi Christian,

So I already forgot about the first few lines of the message (I always cut them away). What I miss is the rest, the stack trace, the list of calls that got me to that line:

I need something like `Stopped at { $err:module }, { $err:line-number }/{ $err:column-number }: { $err:description } { $err:stack-trace }`

I create XML and JSON according to an RFC and I want to be able to have the trace there. I already use { $err:module }, { $err:line-number }, { $err:column-number } and { $err:description } E. g: <problem xmlns="urn:ietf:rfc:7807"> <type>https://tools.ietf.org/html/rfc7807/tests</type>   <title>_:an-error: testError Test1 Test2 Test3</title>   <detail> Test1 Test2 Test3</detail> <instance>https://tools.ietf.org/html/rfc7807/tests/an-error</instance>   <status>500</status>   <trace>/app/tests/api-problem-rest-test.xqm, 38/10 - /app/tests/api-problem-rest-test.xqm, 34/16 - /app/tests/api-problem-rest-test.xqm, 30/15 - /app/tests/api-problem-rest-test.xqm, 26/15 - /app/tests/api-problem-rest-test.xqm, 21/58 - /app/api-problem/api-problem.xqm, 41/26   </trace>   <took>3.55</took> </problem>

While in 10.7+ I only get

<problem xmlns="urn:ietf:rfc:7807"> <type>https://tools.ietf.org/html/rfc7807/tests</type> <title>_:an-error: testError Test1 Test2 Test3</title> <detail> Test1 Test2 Test3</detail> <instance>https://tools.ietf.org/html/rfc7807/tests/an-error</instance> <status>500</status> <trace>/app/tests/api-problem-rest-test.xqm, 38/10</trace> <took>2.15</took> </problem>

See https://github.com/acdh-oeaw/api-problem4restxq/blob/master/tests/api-proble... for details. There is a docker image using 10.6 for quick testing. docker run --rm -it -p 5000:5000 ghcr.io/acdh-oeaw/api-problem4restxq vs docker run --rm -it -p 5000:5000 ghcr.io/acdh-oeaw/api-problem4restxq:27f2a42 Look at to http://localhost:5000

Best regards Omar

Am 12.01.2024 um 14:14 schrieb Christian Grün:

Hi Omar,

Thanks for your observation.

We have removed the BaseX-specific string output, as it was redundant. You should be able to reproduce the old output as follows (using the new XQuery 4 string template syntax):

`Stopped at { $err:module }, { $err:line-number }/{ $err:column-number }: { $err:description }`

As you’ve already discovered the responsible commit, you may have discovered the new XQuery 4 $err:map variable: It bundles all other error values into a single variable.

And @Martin Honnen thanks for mentioning fn:stack-trace. The function is still under discussion and might be dropped again: The specification gives processors much freedom in optimizing its expressions, so it’s hardly possible to define the function in a way that’s not completely implementation-defined.

Hope this helps, Christian