Please carefully read the xml configuration in the file you have pasted

On Sun, Aug 12, 2012 at 12:11 PM, Alaak <[email protected]> wrote:

>
>     <extension id="de.effingo.crawler" name="Some Simple Test Plugin"
> point="org.apache.nutch.indexer.IndexingFilter">
>         <implementation id="page-filter" class="testplugin.SimpleFilter"/>
>     </extension>
> </plugin>

The extension id attribute should equal the package name followed by
your class name. Looking at your Java code this should be

testplugin.SimpleFilter

additionally the implementation id attribute should be SimpleFilter

Do you have the build.xml correctly configured? Have you added the
plugin to plugin.includes property in nutch-site.xml

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