HI I would like to write a plugin.
I understand that the plugins will be discovered by the FactoryRegistry. 

So i am trying out the following code to see if i can iterate through the
other providers already there for geotools , but when i get to the second
line of code below i get the a ClassCastException  error.

Set categories = Collections.singleton(new Class[]
{MathTransformProvider.class});
FactoryRegistry registry = new FactoryRegistry(categories);

This is the error message:

Exception in thread "main" java.lang.ClassCastException: [Ljava.lang.Class;
        at
javax.imageio.spi.ServiceRegistry.<init>(ServiceRegistry.java:103)
        at
org.geotools.factory.FactoryRegistry.<init>(FactoryRegistry.java:153)
        at myfactorytest.Main.main(Main.java:38)

Could any body please help.

Thank you
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