Re: [Geotools-gt2-users] problems with loading referencing module

[Martin D. <mar...@ge...>]

Stefan Steiniger a =E9crit :
> I receive the follwoing error, if i do this:
>  >>>
>             code =3D "EPSG:4979";
>             crs =3D FactoryFinder.getCRSAuthorityFactory(
>                     "EPSG", null).createCoordinateReferenceSystem(code)=
;
>  >>>
> java.lang.NullPointerException
>     at org.geotools.factory.FactoryRegistry.getClassLoaders(FactoryRegi=
stry.java:370)

This error is new to me. I looked in the FactoryRegistry source code, and=
 it may be caused by=20
ClassLoader.getSystemClassLoader() returning null (which is allowed accor=
ding javadoc). Class=20
loaders in Java still an uneasy issue... I will commit a fix on trunk and=
 2.2 branch maybe tomorrow.=20
Is there any chance you can build from trunk?


> i tried to run with the src code from referencing module:
> But here i got a built error for the usage off "assert" in several(!)=20
> classes
>      Syntax error on token "assert", assert expected    Hints.java   =20
> openjumptest/org/geotools/factory    line 301

Make sure you provided the "-source 1.4" command line option to javac.



> i tried to run the provided class CTSTutorial.java
> here i got the following exception:
>=20
> org.opengis.referencing.NoSuchAuthorityCodeException: This factory only=
=20
> understand EPSG codes

Just checked in the epsg-wkt data, and found that epsg-wkt factory doesn'=
t include EPSG:4979.=20
epsg-wkt contains only a subset of the EPSG database. In order to get the=
 full EPSG database, use=20
epsg-hsql instead (or epsg-access or epsg-postgresql if a EPSG database i=
s already installed on your=20
machine). However, doing so, you will fall in the "axis order" issue:

    http://docs.codehaus.org/display/GEOTOOLS/The+axis+order+issue

If you need geographic coordinate reference systems with (longitude,latit=
ude) axis order (at the=20
opposite of what the EPSG database said), then the above page explain how=
 to force that particular=20
order. But this feature is available only with Geotools 2.3.

	Martin.