what's wrong with getting a standardTokenizer from a standardAnalyzer?

[Alain Lauzon]

When I run code that includes this :

StandardAnalyzer analyzer = new StandardAnalyzer();
StandardTokenizer tokenizer = 
(StandardTokenizer)analyzer.tokenStream("someFieldName", someReader);

I get that:
 caught a class java.lang.ClassCastException
 with message: org.apache.lucene.analysis.StopFilter
java.lang.ClassCastException: org.apache.lucene.analysis.StopFilter
        at SearchCompanies.search(SearchCompanies.java:432)
        at SearchCompanies.main(SearchCompanies.java:134)
Any clue on what's wrong with getting a standardTokenizer from a 
standardAnalyzer ?

Alain Lauzon