Cann't get Cache Processor working with SQL Processor results

I was trying to cache SQL query results using Cache Processor.
Orbeon Forms version in use - 3.9 CE
As described here
(http://wiki.orbeon.com/forms/doc/developer-guide/processors-cache-processor#TOC-Cache-database-result)
I downloaded and configured Cache Processor and configured it in my service.xpl
as follows:

    <!-- Cache query results -->
    <p:processor name="oxf:cache">
        <p:input name="data" href="#sql-data"/>
        <p:input name="validity"><validity></validity></p:input>
        <p:output name="data" ref="data"/>
    </p:processor>

At runtime an error occures:

java.lang.NoSuchMethodError

Exception Class
java.lang.NoSuchMethodError

Message
org/orbeon/oxf/processor/ProcessorImpl$ProcessorOutputImpl.<init>(Ljava/lang/Class;Ljava/lang/String;)V

SQL processor alone works just fine. Have you got a clue what went wrong?
Or are there other ways to achieve my goal, i.e. to cache data that come from
relational database?


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