logger « log4j « Java Enterprise Q&A

1. Should a Log4J logger be declared as transient?    stackoverflow.com

I am using Java 1.4 with Log4J. Some of my code involves serializing and deserializing value objects (POJOs). Each of my POJOs declares a logger with

private final Logger log = Logger.getLogger(getClass());

2. Log4j: Why is the root logger collecting all log types regardless the configuration?    stackoverflow.com

I am having problem that even though I specify the level to ERROR in the root tag, the specified appender logs all levels (debug, info, warn) to the file regardless the ...

3. Whats the overhead of creating a Log4j Logger    stackoverflow.com

I have some webservices in my application and i want to log them to diferent files, based on the webservice name. For that i am creating loggers with

myLogger = Logger.getLogger(logKey);

4. Compare log4j and Logger    stackoverflow.com

How does The JDK's Logger compare to Apache log4j? Which one is better for new projects that target Java 6? How do they compare in terms of ...

5. log4j rootlogger turn off logger for some classes    stackoverflow.com

how can i configure a log4j.properties with a rootlogger = debug, stdout, logfile
and org.apache.httpclient = debug which goes into the logfile but not the stdout? raising the rootlogger to info ...

6. java wrapper around log4j logger and java.util.logging    stackoverflow.com

I am writing a library. The library can be used by applications that use log4j loggers and java.util.logging loggers. So, I wrote a quick wrapper class, that encapsulates both loggers. I allow ...

7. Log4J: Strategies for creating Logger instances    stackoverflow.com

I decided to use Log4J logging framework for a new Java project. I am wondering what strategy should I use for creating/managing Logger instances and why?

• one instance of Logger per class e.g. class ...

8. How to configure log4j to log different log levels to different files for the same logger    stackoverflow.com

I have a normal INFO level log for application. What I need is to additionally log all ERROR level events to separate error log. I am using configuration like this:

<logger name="com.acme">
 ...

9. How to set javax logger handle to be refactor sensitive    stackoverflow.com

Someone might yell at me to read the faqqing faq, but I'm in a hurry ... Does anyone have a way to make javax or log4j logger refactor-sensitive? Say, that currently utils.Something has ...

10. slf4j with log4j. Get logger to reset/restart    stackoverflow.com

I am trying to switch System.out on a button action, which works but the logger is still writing to the old PrintStream.

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

private final static Logger logger = LoggerFactory.getLogger(ActionButtons.class);

PrintStream mStartingOut ...

11. Difference in using java.util.logging and Log4j Loggers    stackoverflow.com

I am developing a java application for which i have to use a logging mechanism. And now i am confused to choose either java libraries logger or to go for Log4j ...

12. Category VS logger tags in jboss-log4j.xml    stackoverflow.com

What should we use in jboss-log4j.xml in order to turn on/off traces for our product - "category" or "logger" tag? By default JBoss uses "category" in jboss-log4j.xml.
But as far as ...

13. Using same log4j logger in standalone java application    stackoverflow.com

I have some code which is a standalone java application comprising of 30+ classes. Most of these inherit from some other base classes. Each and every class has this method to get and ...

14. log4j or java.util's logger which is the best to use     stackoverflow.com

log4j or java.util's logger which is the best to use .. already this question is thr but i did get clear idea.. can any one help me out ...

15. Is there a way to trigger a stacktrace whenever a particular logger is used?    stackoverflow.com

I'm currently trying to track down the source of some lazy loading calls in hibernate, and the easiest way to do so would be to turn on hibernate SQL logging whenever ...

16. How to initialize slf4j (using log4j) logger properly in abstract classes / for inheritance    stackoverflow.com

In my project I've got a top-level abstract class FrameProducer. I added a slf4j logger at this level, so that every inheriting class already has it. Here the code:

public abstract class ...

17. Can a log4j (or other Java logger) Appender accept or access request context objects?    stackoverflow.com

I am currently writing a web service using Restlet, and logging with slf4j in front of log4j. Currently I have standard log4j Appenders in place for logging to files. ...

18. Why is Logger.isInfoEnabled deprecated for org.jboss.logging.Logger?    stackoverflow.com

I have been away from using Log4J for a few years. I'm now working on an application under JBoss 5, using the org.jboss.logging package. Back when I used to ...

19. Different Logger in the same class using Log4J    stackoverflow.com

I want specific messages generated from within the same class to be logged separately. So, how can I create 2 different types of loggers within the same class. Currently, the Properties ...

20. Using getSimpleName() vs getName() for acquiring logger    stackoverflow.com

I've seen code that uses log4j, which acquires logger for a given Logger using

static public Logger getLogger(String name)

static public Logger getLogger(Class clazz)

21. Java logging best practices about logger name    stackoverflow.com

I just ask about the logger name... It it possible to give a custom name for a logger, or to use class name. But what to use in which case? -> Using a custom ...

22. Logger.setLevel() doesn't enable logging correctly    stackoverflow.com

Situation: I have this log4j logger:

private static final Logger logger = Logger.getLogger(ThisClassName.class);

Logger.getLogger(ThisClassName.class).setLevel(Level.DEBUG);

23. Logging of multiple appenders to same logger    stackoverflow.com

I want to implement same logfile for different appenders ..Is it possible to do so?or should i have to use different log files?

24. How to exclude a single Class from a Log4j Logger / Appender?    stackoverflow.com

I have a package "com.example". This package has five classes. I want to log four of these classes to a file, but exclude the fifth class. I could write four loggers, e.g. ...

25. Can we have different prefix(layout) for different loggers    stackoverflow.com

Can we have different layouts i.e prefix for different loggers? e.g Date [PrefixString A] for loggers com.foo.A Date [Prefixstring B] for loggers com.foo.B

26. Log4j Logger Hijack?    stackoverflow.com

Greetings-- Is it possible for Log4j to get "hijacked" by another process? I've just inherited a Struts2 application; we'll call that App-A. It runs on Tomcat 6. Supporting it is another Java application ...

27. log4j.Logger maximum String length    stackoverflow.com

Is there any maximum String length with can be passed to the Logger.info(String)? I had this problem when a generated String was passed to Logger.info(String):

at java.io.FileOutputStream.writeBytes(Native Method)
at java.io.FileOutputStream.write(FileOutputStream.java:260)
at java.io.BufferedOutputStream.write(BufferedOutputStream.java:105)
- locked <4988e6e9> (a ...

28. Wrap log4j or create custom logger?    stackoverflow.com

I have an application that needs to log two different types of messages: application log messages and audit messages. Application log messages match the standard lo4j Logger perfectly, but there are ...

29. How to avoid root appender to appended to sub loggers    stackoverflow.com

I have implement a log4j.xml file having two loggers. Both EventLogger and ErrorLogger logged in to textfile. Also I create console appender and appended it to the root. My problem is when ...

30. Subclassing org.apache.log4j.Logger without altering %C?    stackoverflow.com

To enable things like

logger.info("This is a formatted number: %.2f", number)

31. Global logger — How to implement?    stackoverflow.com

In my application there's a certain global logger. It's configured in log4j like this

<logger name="org.remover.protocol">
   <level value="debug"/>
</logger>

32. how to use log4j logger declared in Java side from a dll    stackoverflow.com

We are using a dll with JNA in our java project. We would like the C code to also log to our log4j log files, is there an easy way of ...

33. JDK Logger Vs Log4j    stackoverflow.com

I have used Log4j and JDK Logger both for logging purpose, so i find it same as implementation. But now, i have to write a logging framework, which will help ...

34. How to use less logger.isDebugEnabled()    stackoverflow.com

Here i will add logger.isDebugEnabled() conditional statement for logger.debug(). But sometime there are many logger.debug() in loop. For example:

Logger log = Logger.getLogger(Test.class);

for(int i = 0; i < 1000; i++) {
   ...

35. Log4J: How do I redirect an OutputStream or Writer to logger's writer(s)?    stackoverflow.com

I have a method which runs asynchronously after start, using OutputStream or Writer as parameter. It acts as a recording adapter for an OutputStream or Writer (it's a third party API I ...

36. Log4j deadlock occuring between Logger and Appender    stackoverflow.com

I am using a LogAppender class which extends a Console Appender and internally uses a Sendmail function to send mails if the log level is ERROR. (I know I could have used ...

37. Is it efficient to obtain a Logger from a static final variable initializer?    stackoverflow.com

We have a lot of class code which has some boilerplate like the following:

private static Logger logger = null;

private static Logger getLogger() {
  if (logger == null) {
   ...

38. log4j logger locale problem    stackoverflow.com

I am using Log4j Logger for my application.My application is supporting japanese language also,In japanese locale it is printing log date time in japanese but I want it should print in ...

39. Log4j mapping all loggers to a single logger    stackoverflow.com

Our middleware team assignes logger names to each application and that is how they know where to direct our socket appenders to. I would like to use the standard Logger.getLogger(Clazz.class) paradigm but ...

40. LOG4J Multiple Loggers in same class    stackoverflow.com

I have a java project that has a log4j logging. It uses a rolling file appender and multiple loggers to log to a file. I want to add a DBappender and ...

41. Putting Log4j loggers into an number of classes    stackoverflow.com

I want to add logging to quite few classes in my program. Do I need to add lines to define a logger to each class that needs a logger (I want ...

42. Not getting INFO logs in log file using log4j logger    stackoverflow.com

I am starting on java and log4j. I need help with my test program.

$pwd

$ls

$cat Log4jTest.java 
  import org.apache.log4j.Logger;
import org.apache.log4j.xml.DOMConfigurator;

public class Log4jTest
{
public static ...

43. Buffered Loggers (Java)    stackoverflow.com

I'm toying around with the idea of building a logging system that pushes log statements to an internal buffer until it reaches a pre-defined capacity, and then dumps (flushes) the whole ...

44. Number of loggers used    stackoverflow.com

I'm working on a very large java application with log4j, and I was wondering if there is a way to extract in runtime the number of active loggers? Or what are ...

45. How to create custom Logger component with log4j so that it can be useful in different projects?    stackoverflow.com

I want to create a custom logging component using log4j, which can be used in different projects. What all point I need to address while developing the component. Any supporting code link for ...

46. User defined logger    stackoverflow.com

I am quite new to the Log4j . I am having a few questions on root logger and user defined logger.

1. On what basis should we create user defined logger (Project ...

47. How to configure the java plugins/packages like org.apache.log4j.Logger ?    coderanch.com

My application uses many such packages which are not inborn sun packages and need to download and configure them for application to import properly. like import org.apache.commons.lang.StringUtils; or like import org.apache.log4j.Logger; etc. and also the java advanced packages like group of javax 's packages, I dont wanna to download the entire jdk for this and reconfigure it again,just the javax packages ...

48. log4j problem - global logger?    coderanch.com

Hi guys. I hope this is the right place to post a question about log4j. if not please redirect me to the appropriate thread. So...what i want to do is to write a logging implementation that uses log4j to log to a database. i use an the jdbc appender from http://www.mannhaupt.com/danko/projects/index.html it all goes well when i use it to log ...

49. Get the Line number in log with Log4j Logger.    java-forums.org

50. Log4j logger    forums.oracle.com

Hello. Last days i was using for logging my meassage. there i added a Filehandler with the loger to get the logging message in a defined file. but there was a problem of .lck file. now i want to use for same work. can someone give me an example of use org.apache.log4j.Logge. I want to log the message ...

51. customised logger using log4j    forums.oracle.com

I have 3 projects defined: web , shared and ejb. i defined my customised logger in shared project and added this shared project to both web and ejb so that both web and ejb can use this customised logger. I unit tested in my shared project and it works but problem i am facing is inspite of adding log4j.jar to shared ...

52. Logger DWR with LOG4J.    forums.oracle.com

Hello, I was looking for forums the way to use Log4J Logger with DWR. We added the following lines in the log4j.properties file: log4j.category.uk.ltd.getahead.dwr=warn,my_appender log4j.additivity.uk.ltd.getahead.dwr=false We want to get logging the DWR traces into the application's logs because it is logging into the System's log by the moment and it causes us filesystems space problems. Thank you.

53. log4j static vs non-static loggers    forums.oracle.com

public static void myLog(String s) { logA.info("in myLog, " + s); } } public class B extends A{ protected static Logger logB = Logger.getLogger(B.class); . . . . myLog("Log Statement Number 1"); //This statement does not get printed all the time logB.info("Log Statment Number 2"); //This statement always get printed } Any help is appreciated. Thanks Anoop

54. Logger.getAnonymousLogger and log4j    forums.oracle.com

55. Log4j / Way to use any appender to get log4j logs into java logger logs?    forums.oracle.com

Thanks a lot, but this is not what i ment. I use glassfish. Glassfish uses for all log the Java Logger. My problem ist, that I have a library, that uses Log4J for logging. My current workaround is, to log all Log4J logs to console. Glassfish collect all "sysouts" and write them into the jave logger log file. But I wonder, ...

56. log4j - creating 2 loggers    forums.oracle.com

57. Problem with log4j logger implementation    forums.oracle.com

58. Log4j Logging Strategy: Using multiple Loggers in same Class file    forums.oracle.com

Hi, In my application, I wanted to use logging this way: 1. Use general log4j logging statement which goes to a project log file (It works fine). For e.g logger.getLogger( "ToolCli.class" ); 2. A special log which needs to be written to a separate file. Here we are not concerned about the log levels. We need only one level. Basically we ...

59. Problem working with Logger. org.apache.log4j    forums.oracle.com

What all configurations do i need to do to use this in a sample java application and in servlets. i'm totally confused. I was able to work with the logger class that comes with jdk1.4. but i'm asked to use this. because i want to use the recycling of file. pls give a step by step instruction.