How To Create Error Log File In Java
Contents |
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with
How To Write Into A Log File In Java
us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow how to write log file in java using log4j Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up java filehandler Creating a log file only when an error or exceptions occured without using log4j up vote 1 down vote favorite 1 I want to maintain a log file or txt file ,where I am able to maintain the exception details as well
How To Create A Log File In Java Code
as some other details either in txt or log file.The scenario is like this try { ....... } catch(exception e) { here the file should be created } what will be the best optimize solution for this without using logging frameworks. Could this work for me? try { // something } catch (Exception ex) { ex.printStackTrace(new PrintStream(new File("error.log"))); } java file exception logging error-handling share|improve this question edited Nov 9 '12 at 7:08 assylias 175k23334480 asked Nov 9 '12 at 6:50 arvin_codeHunk 1,12052338 1
Java Logging Configuration File
can you elaborate a bit further why logging frameworks are out of the question? but well, if you insist on going without them, then you'd need to roll your own. There is no one "best optimize solution". –eis Nov 9 '12 at 6:54 what do you mean by elaborate, see I have to just write the exception details into a file when an exception occurs,thats it, is'nt it clear –arvin_codeHunk Nov 9 '12 at 7:00 I like using a simple FileWriter : construct in the constructor of the class, and just call for each write method in the catch exceptions. Might not be the best way, but it is pretty easy to implement. –Vineet Kosaraju Nov 9 '12 at 7:11 add a comment| 4 Answers 4 active oldest votes up vote 1 down vote accepted I don't know why you not like to use logger Framework. Ok so One thing you can do create FileWritter object on the top level and use it in your class where you want. BufferedWriter bw = null; String path = "your//file//path//where u want to save your log"; try { bw = new BufferedWriter(new FileWriter(new File(path))); } And in your code. try { ....... } catch(exception e) { bw.write("here the file should be created"); bw.flush(); } share|improve this answer answered Nov 9 '12 at 7:02 Sumit Singh 15.6k54078 add a comment| Did you find this question interesting? Try our newsletter Sign up for our newsletter and get our top new question
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and how to create log file in java web application policies of this site About Us Learn more about Stack Overflow the
Java Log File Location
company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags java simpleformatter Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only http://stackoverflow.com/questions/13303441/creating-a-log-file-only-when-an-error-or-exceptions-occured-without-using-log4j takes a minute: Sign up (Java) writing events to log text file up vote 5 down vote favorite 3 I am trying to write the events in a log file but no file is being created. I am getting no error at all. Here is the log class: public class Logs { static FileHandler fileTxt; static SimpleFormatter formatterTxt; static public void http://stackoverflow.com/questions/13970595/java-writing-events-to-log-text-file logging() throws IOException { Logger logger = Logger.getLogger(""); logger.setLevel(Level.INFO);//Loget Info, Warning dhe Severe do ruhen fileTxt = new FileHandler("c:/SimleTaskEvents.txt"); formatterTxt = new SimpleFormatter(); fileTxt.setFormatter(formatterTxt); logger.addHandler(fileTxt); } } java logging text-files share|improve this question edited Dec 20 '12 at 10:59 a_horse_with_no_name 186k24234311 asked Dec 20 '12 at 10:55 Han 152229 1 In the future please post your exact error message –Wojtek Dec 20 '12 at 10:58 I am getting no error at all. Only that no file is being created in "c:/" –Han Dec 20 '12 at 11:00 Tested your code and it works fine. The problem is somewhere else. –svz Dec 20 '12 at 11:17 add a comment| 5 Answers 5 active oldest votes up vote 3 down vote accepted fileTxt = new FileHandler("c:/SimleTaskEvents.txt"); This line only creates a handler. It does not create the file. What you need to do is, create the file(SimleTaskEvents.txt) in the directory "C:/". after that when u execute your program, the same program that u have put here, you will see logs being written to it. share|improve this ans
This Site Careers Other all forums Forum: Beginning Java Writing into log file Gopu Akraju Ranch Hand Posts: 242 posted 8 years ago I have finished developing a swing application and I would like to change all my System.out.println https://coderanch.com/t/410260/java/java/Writing-log-file statements into log. I would like to write these lines into a log file for that application. I am planning to concatenate all these strings into one string and finally opening a log file to write http://www.vogella.com/tutorials/Logging/article.html everything in one step before the program exit. B'cos I feel it would be cumbersome to open many times to write the System.out into log file (With as many as try catch.. as many as System.out log file statements). Any other nicer way to do this? [ April 28, 2008: Message edited by: Gopu Akraju ] Gopu Akraju Ranch Hand Posts: 242 posted 8 years ago Hi after googling I came to know about the class Logger. I treid a small example from the web as below. import java.io.IOException; import java.util.logging.FileHandler; import java.util.logging.Level; import java.util.logging.Logger; import java.util.logging.SimpleFormatter; public class MyLogger { public static void main(String[] args) { Logger log file in logger = Logger.getLogger("MyLog"); FileHandler fh; try { // This block configure the logger with handler and formatter fh = new FileHandler("C:/temp/test/MyLogFile.log"); logger.addHandler(fh); //logger.setLevel(Level.ALL); SimpleFormatter formatter = new SimpleFormatter(); fh.setFormatter(formatter); // the following statement is used to log any messages logger.info("My first log"); } catch (SecurityException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } logger.info("Hi How r u?"); } } The output looks like below: Apr 29, 2008 9:57:08 AM testing.MyLogger main INFO: My first log Apr 29, 2008 9:57:08 AM testing.MyLogger main INFO: Hi How r u? Is there any better of doing this? Thanks. Gopu Akraju Ranch Hand Posts: 242 posted 8 years ago logger works fine. How do I limit the size of the log file. After the file size has reached by 51MB, I want to flush the contents and starts writing again in the same file. Thanks in advance. Laxman Guru Greenhorn Posts: 17 posted 8 years ago Refer Here Laxman Gopu Akraju Ranch Hand Posts: 242 posted 8 years ago Thanks and I got it. int limit = 1000000; // 1 Mb fh = new FileHandler("C:/temp/test/MyLogFile.log", limit,1,true); Even though I did go through api, I have a doubt about the third parameter (i.e count=1)DOes it mean, that once the log file size
Best Practices 2. Example 2.1. Create the logger 2.2. Use the logger 3. About this website 4. Links and Literature 4.1. vogella GmbH training and consulting support Appendix A: Copyright and License Java Logging. This article describes how to use the Logging API in Java programs. It includes an example for creating an HTML logger. 1. Overview 1.1. Logging Logging is the process of writing log messages during the execution of a program to a central place. This logging allows you to report and persist error and warning messages as well as info messages (e.g., runtime statistics) so that the messages can later be retrieved and analyzed. The object which performs the logging in applications is typically just called Logger. 1.2. Logging in Java Java contains the Java Logging API. This logging API allows you to configure which message types are written. Individual classes can use this logger to write messages to the configured log files. The java.util.logging package provides the logging capabilities via the Logger class. 1.3. Create a logger To create a logger in your Java code, you can use the following snippet. import java.util.logging.Logger; // assumes the current class is called MyLogger private final static Logger LOGGER = Logger.getLogger(MyLogger.class.getName()); The Logger you create is actually a hierarchy of Loggers, and a . (dot) in the hierarchy indicates a level in the hierarchy. So if you get a Logger for the com.example key, this Logger is a child of the com Logger and the com Logger is child of the Logger for the empty String. You can configure the main logger and this affects all its children. 1.4. Level The log levels define the severity of a message. The Level cla