Error loading a custom request handler in Solr 4.0

[Tom Mortimer]

Hi,

Apologies if this is really basic. I'm trying to learn how to create a
custom request handler, so I wrote the minimal class (attached), compiled
and jar'd it, and placed it in example/lib. I added this to solrconfig.xml:

    <requestHandler name="/flaxtest" class="FlaxTestHandler" />

When I started Solr with java -jar start.jar, I got this:

    ...
    SEVERE: java.lang.NoClassDefFoundError:
org/apache/solr/handler/RequestHandlerBase
at java.lang.ClassLoader.defineClass1(Native Method)
        ...

So I copied all the dist/*.jar files into lib and tried again. This time it
seemed to start ok, but browsing to http://localhost:8983/solr/ displayed
this:

    org.apache.solr.common.SolrException: Error Instantiating Request
Handler, FlaxTestHandler is not a org.apache.solr.request.SolrRequestHandler

        at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:410) ...


Any ideas?

thanks,
Tom