(java) cannot find symbol

Class stemClass = Class.forName("terrier.SnowballStemmer");

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import org.tartarus.snowball.SnowballProgram;
import uk.ac.gla.terrier.terms.SnowballStemmer;


public class lem {
    public static void lem(String s, String s1,String s2) throws Throwable{
    Class stemClass = Class.forName("uk.ac.gla.terrier.terms." +
					s+ "SnowballStemmer");
         SnowballStemmer stemmer = (SnowballStemmer) stemClass.newInstance();
         SnowballProgram stemmer1 = (SnowballProgram) stemClass.newInstance();

	Reader reader;
	reader = new InputStreamReader(new FileInputStream(s1));
	reader = new BufferedReader(reader);

	StringBuffer input = new StringBuffer();

        OutputStream outstream;


                outstream = new FileOutputStream(s2);

	Writer output = new OutputStreamWriter(outstream);
	output = new BufferedWriter(output);

	int repeat = 1;


	Object [] emptyArgs = new Object[0];
	int character;
	while ((character = reader.read()) != -1) {
	    char ch = (char) character;
	    if (Character.isWhitespace((char) ch)) {
		if (input.length() > 0) {
		    stemmer1.setCurrent(input.toString());
		    for (int i = repeat; i != 0; i--) {
			stemmer.stem("");
		    }
		    output.write(stemmer1.getCurrent());
		    output.write('\n');
		    input.delete(0, input.length());
		}
	    } else {
		input.append(Character.toLowerCase(ch));
	    }
	}
	output.flush();
    }




    @SuppressWarnings("static-access")
    public static void main(String[] args) throws Throwable {
        // TODO code application logic here
        lem l=new lem();
        l.lem("French","entree.txt","resultat.txt");
    }

}