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public class ExceptionLog {
    
    private static String logMessage;
    
    public static void main(String[] args) {
        ExceptionLog log = new ExceptionLog();
        FileWriter fw=null;
        BufferedWriter bw=null;
        try {
            fw = new FileWriter("log_file.txt", true);  
            //this This can throw an exception, but the logging of messages is
            // not silently prevented.
            bw = new BufferedWriter(fw);
        }
        catch (IOException e) { 
            // The logging example cannot recover from failure to open
            // the log file.
            throw new RuntimeException(e);
        }
        
        //some security exception occurs here
        try {
            log.logMessage("Security Exception has occurred!");
            log.writeLog(bw);
        }
        catch (IOException e) {
            // Logging of the security exception does not silently fail.
            System.err.println("Logging error failed.");
        }
        
        try {
            bw.close();
        }
        catch (IOException e) {
            System.err.println("Closing log file failed.");
        }
    }
    
    public static void logMessage(String message) {
        logMessage = message;
    }
    
    public void writeLog(BufferedWriter bw) throws IOException {
        bw.write(logMessage + "\n");
        System.err.println(logMessage);    
    }
}