The error messages now look like this:

Mapping_en:Infobox_monarch: Couldn't load property mapping on page
Mapping en:Infobox monarch. Details: property
http://dbpedia.org/ontology/activeYearsEndYear has range
http://www.w3.org/2004/02/skos/core#Concept, which is not a datatype

On 9 July 2013 15:13, Jona Christopher Sahnwaldt <[email protected]> wrote:
> That's correct. We should throw a more useful exception in 
> DateIntervalMapping.
>
> What confused me was the "Details: null" on the validation page, but
> after I restarted the server and reloaded the page, I saw proper
> exeption messages. When I reloaded the page again, the messages
> disappeared and all I saw was "Details: null". Must be caused by this:
>
> http://www.oracle.com/technetwork/java/javase/relnotes-139183.html#hotspot
> The compiler in the server VM now provides correct stack backtraces
> for all "cold" built-in exceptions. For performance purposes, when
> such an exception is thrown a few times, the method may be recompiled.
> After recompilation, the compiler may choose a faster tactic using
> preallocated exceptions that do not provide a stack trace. To disable
> completely the use of preallocated exceptions, use this new flag:
> -XX:-OmitStackTraceInFastThrow.
>
>
> I just added -XX:-OmitStackTraceInFastThrow and restarted the server.
> It looks like we always get a more useful message now.
>
> JC
>
> On 9 July 2013 14:45, Andrea Di Menna <[email protected]> wrote:
>> I don't think this is a bug.
>> That property is used in the DateIntervalMapping and it is trying to cast
>> the range of the property to a DataType while skos:Concept is a class.
>>
>> Does it make sense?
>>
>>
>> 2013/7/9 Jona Christopher Sahnwaldt <[email protected]>
>>>
>>> All right, after this change:
>>>
>>>
>>> http://mappings.dbpedia.org/index.php?title=OntologyProperty:ActiveYearsEndYear&diff=27217&oldid=27207
>>>
>>> there are 34 errors again:
>>>
>>> http://mappings.dbpedia.org/server/mappings/en/validate/*
>>>
>>> Looks like a bug in mappings loader or somewhere. I'll investigate.
>>>
>>>
>>> On 9 July 2013 14:37, Jona Christopher Sahnwaldt <[email protected]> wrote:
>>> > Strange. Now all the errors are gone. Maybe there were only a few
>>> > genuine errors, but somehow they caused other exceptions in the
>>> > mappings loader. I guess we will never know.
>>> >
>>> > JC
>>> >
>>> > On 9 July 2013 12:32, Andrea Di Menna <[email protected]> wrote:
>>> >> Hi all,
>>> >>
>>> >> do you know where those errors are coming from?
>>> >>
>>> >> http://mappings.dbpedia.org/server/mappings/en/validate/*
>>> >>
>>> >> Thanks
>>> >> Andrea
>>> >>
>>> >>
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>>
>>

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