Redirecting Printstacktrace to a file

Question

I want to print the stack trace of an exception to a file instead of the standard output. How do I do it? Can anyone paste a small example or pseudo code?

Answer 1

Here's something to get you started...
import java.io.* ;
public class Logger {
    private File logFile ;
    public Logger(File logFile) throws IOException {
        this.logFile = logFile ;
        log("starting log...") ;
    public void log(String msg) throws IOException {
        synchronized (logFile) {
            PrintWriter logWriter = new PrintWriter(new FileWriter(logFile.toString(), true)) ;
            logWriter.println(msg) ;
            logWriter.flush() ;
            logWriter.close() ;
    public void log(String msg, Throwable th) throws IOException  {
        synchronized (logFile) {
            PrintWriter logWriter = new PrintWriter(new FileWriter(logFile.toString(), true)) ;
            logWriter.println(msg) ;
            th.printStackTrace(logWriter) ;      // <<---***
            logWriter.flush() ;
            logWriter.close() ;
}Throwable.printStacktrace() goes to the standard err (System.err) by default incidentally.