[postgis-devel] Possible Bug in isvalid()

[Markus Schaber]

Hi,

(Added X-Post to JTS Developers list.)

Markus Schaber schrieb:
> I just tried to apply my isvalid constraint to our raw data tables, and
> got the following error message on one of them:
> 
> NOTICE:  AssertionFailedException: Unable to find a hole point not a
> vertex of the shell
> ERROR:  GEOS isvalid() threw an error!
> 
> This sounds rather strange to me. IMHO, it should not be possible to
> make isvalid() throw an error by feeding it an invalid geometry.
>
> I'll try to track down which geometries cause this error message...

I now got a simple example:

> gisblau=# select isvalid('MULTIPOLYGON(((0 0, 10 10, 10 0, 0 0),(5 5, 5 0, 10 5, 5 5)))');
> NOTICE:  AssertionFailedException: Unable to find a hole point not a vertex of the shell
> ERROR:  GEOS isvalid() threw an error!

The attached small java program triggers this error on my machine
against jts-1.6.jar.

HTH,
Markus
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