New to Java

Hello all, i'm having problems with this code. The compiler says: The method put(String, BufferedWriter) in type Map<String, BufferedWriter> is not applicable for the arguments(String, FileWriter).

Also there is another error that says: Cannot Cast From BufferedWriter to FileWriter.

i understand that to use a BufferedWriter, you need a FileWriter, i'm not used to deal with maps and bufferedWriters together :/

Thanks in advance!

package pkg.mig;

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

public class Uf_file {
	static Map<String, BufferedWriter> filemap;
	static Map<String, Long> filelenghmap;
	static Map<String, Integer> filesecuence;
	static FileWriter out;
        static BufferedWriter bw;

	public static void writeUF(String ufName, String sys, String uf_row) {

		if (filemap == null) {
			filemap = new HashMap<String, BufferedWriter>();
			if (filelenghmap == null) {
				filelenghmap = new HashMap<String, Long>();
				filesecuence = new HashMap<String, Integer>();
			}

		}

		if (filelenghmap.get(ufName) == null) {

			filelenghmap.put(ufName, new Long(0));
			filesecuence.put(ufName, new Integer(0));

		}

		if (filemap.get(ufName) == null) {

			try {
				filemap.put(ufName, new FileWriter(getFileName(ufName, sys), true));
				Utils.logger.info("Creando nuevo archivo: " + ufName +"-"+filesecuence.get(ufName));
			} catch (IOException e) {
				// TODO Auto-generated catch block
				Utils.logger.severe(e.toString());
				Utils.close_app(1);
			}
		}

		out = (FileWriter) filemap.get(ufName);
		try {
			bw.write(uf_row);
			filelenghmap.put(ufName, filelenghmap.get(ufName) + uf_row.length());
			if (filelenghmap.get(ufName) > Long.parseLong(Utils.app_properties.getProperty("UF_Size"))) {
				closeUF(ufName);
			}

		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	static String getFileName(String ufName, String sys) {
         
         
		filesecuence.put(ufName, filesecuence.get(ufName) + 1);

		return sys + "." + ufName + "." + Utils.getDateSystem()+"EXT-"+Utils.app_properties.getProperty("EXT") +"-"+
		Utils.fNumber(Integer.toString(filesecuence.get(ufName)),3) + ".inp";
	
	}

	static void closeUF(String ufName) {
		bw = (BufferedWriter) filemap.get(ufName);
		try {

			out.close();
			filemap.remove(ufName);
			filelenghmap.put(ufName, (long) 0);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

}