에러 발생시 StackTrace를 String으로

public static String getStackTrace(Throwable e) {

        java.io.ByteArrayOutputStream bos  =  new java.io.ByteArrayOutputStream();

        java.io.PrintWriter writer = new java.io.PrintWriter(bos);

        e.printStackTrace(writer);

        writer.flush();

        return bos.toString();
}