Erro com assentuação

import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Connection;
import java.sql.Statement;
import java.util.Properties;
/**
 * @author Rodrigo
 *
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public class FBExample {

	public static void main(String[] args) {
		new FBExample().execute();
	}
	protected Connection getConnection(
		String user,
		String password,
		String database) {
		try{
		Class.forName("org.firebirdsql.jdbc.FBDriver");
		}catch(Exception e){
			e.printStackTrace();
			return null;
		}
		Properties p = new Properties();
		p.put("user",user);
		p.put("password",password);
		p.put("lc_ctype","ISO8859_1");
		try{
			return DriverManager.getConnection("jdbc:firebirdsql:" + database,p);
		}catch(Exception e){
			e.printStackTrace();
			return null;
		}
	}

	protected ResultSet execSQL(Connection con, String sql) {
		try{
			Statement s = con.createStatement();
			s.execute("insert into teste_acento values('ácento')");
			return s.executeQuery(sql);
		}catch(Exception e){
			e.printStackTrace();
			return null;
		}
	}

	protected void execute() {
		Connection c = getConnection("sysdba","masterkey","172.18.4.3/3050:/home/gdb/teste_fb1.gdb");
		ResultSet r = execSQL(c,"select * from teste_acento");
		try{
			while(r.next()){
				System.out.println(r.getString(1));
			}
		}catch(Exception e){
			e.printStackTrace();
		}
	}

}