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execute process is meant to execute other RapidMiner processes.
The easiest way to integrate Java code into RapidMiner is to implement the new functionality as an operator in a custom extension. That requires knowledge of java programming and is described in our whitepaper How To Extend RapidMiner. It is freely available at http://rapid-i.com/content/view/306/233/lang,en/ .
You can probably use one of the stemming operators from the text mining extension as a base.
Best regards,
Marius
thx