[geotk] Concerting Coordinates between custom Transverse Mercator and WGS84 Lon-Lat

Martin Desruisseaux martin.desruisseaux at geomatys.fr
Thu Mar 4 04:41:45 EST 2010

Hello Dan

Thanks for the report. The symptoms that you are facing look like a ClassLoader 
issue. I would be curious to know:

  * Do you have a development cycle where the application is deployed,
    undeployed and redeployed again without restarting the server? Or
    something similar like a JAR file installed, uninstalled and re-

  * If the above is 'yes', do you install / uninstall individual Maven
    JAR files, or the "everything in one big JAR" bundle?

Do be more specific, the services declared in the META-INF/services need to be 
unregistered when Geotk is uninstalled. I have not yet provided a convenience 
method for that.



Le 04/03/10 10:08, dan twining a écrit :
> Hi Martin,
> Thanks for your reply. It turns out that the exception is caused by a
> weird interaction between GTK and the GWT (Google Web Toolkit) "devmode"
> (the coordinate conversion is happening in the back-end of a GWT/Java
> web app). For the record, this is the exception:
> Caused by: java.lang.RuntimeException: java.lang.ClassCastException:
> class org.geotoolkit.referencing.operation.DefaultMathTransformFactory
>       at com.example.LonLatConverter.toLonLat(LonLatConverter.java:47)
> ...
> Caused by: java.lang.ClassCastException: class
> org.geotoolkit.referencing.operation.DefaultMathTransformFactory
>       at java.lang.Class.asSubclass(Class.java:3018)
>       at
> org.geotoolkit.factory.FactoryRegistry.register(FactoryRegistry.java:921)
>      at
> org.geotoolkit.factory.FactoryRegistry.scanForPlugins(FactoryRegistry.java:793)
>      at
> org.geotoolkit.factory.FactoryRegistry.scanForPluginsIfNeeded(FactoryRegistry.java:843)
>      at
> org.geotoolkit.factory.FactoryRegistry.getServiceProviders(FactoryRegistry.java:236)
>      at
> com.example.LonLatConverter.getMathTransformFactory(LonLatConverter.java:71)
>      at com.example.LonLatConverter.toLonLat(LonLatConverter.java:35)
> ...
> My current work-around is to use the GWT Eclipse Plug-in. That doesn't
> throw the exception, nor does building the war and deploying the web-app
> to either Tomcat or Jetty. All very strange, but I'm happy to ignore it
> for now.
> Thanks again for your help,
> dan

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