java.util.logging

I'm using the PMD plugin for eclipse and it gives me an error when using System.out.println() with the explanation: System.(out|err).print is used, consider using a logger. My question is - What is a Logger? How is it used to print to the screen? Why is it better? matt b See this short introduction to log4j . The issue is in using System.out to print debugging or diagnostic information. It is a bad practice because you cannot easily change log levels, turn it off, customize it, etc. However if you are legitimately using System.out to print information to the user, then you can ignore this

I want to create the log file per request in the format below, using java util logging. YYYYMMDD_HHMMSS.log Anybody please let me know how can I achieve this using java util logging? The FileHandler doesn't support generating file names by date and time from the LogManager. If you want to generate a file name on startup you can subclass the FileHandler and create a static method to generate your file name using a SimpleDateFormat . The LogManager supports a 'config' option that will also allow you to install custom code to setup and install a FileHandler. public class RollingFileHandler

I'm trying to suppress output of the date line durinng logging when using the default logger in java.util.logging. For example, here is a typical output: Jun 1, 2010 10:18:12 AM gamma.utility.application info INFO: ping: db-time=2010-06-01 10:18:12.0, local-time=20100601t101812, duration=180000 Jun 1, 2010 10:21:12 AM gamma.utility.application info INFO: ping: db-time=2010-06-01 10:21:12.0, local-time=20100601t102112, duration=180000 I would like to get rid of the Jun 1, 2010... lines, they just clutter my log output. How can I do this? From Java SE 7 there is a new system property: java.util

I guess I can chnage pattern by adding the line java.util.logging.ConsoleHandler.pattern, however where to check the pattern information like %u %h etc? Edit: The below was written at the time for Java 6. For 7 and later, refer to David's answer below. AFAIK there is no such property. There is a java.util.logging.FileHandler.pattern but this is to set the pattern of the output filename , not of the logging format. The way you configure the output format in the util logging API is by setting the Formatter . By default, a SimpleFormatter is attached to your ConsoleHandler . This formatter simply

I have problem with space so need limit size of catalina.out to 10M and limit number of rolls to 3 previous days. Is it possible with only configure logging.properties? Thanks. As Tomcat internally uses JUL to log , you can use the system property java.util.logging.config.file to specify the file path of the properties file. For the format of this properties file , you can refer to your JRE_HOME/lib/logging.properties (which is the default configuration file used by JUL) However, JUL does not support the daily rotation . If you don't mind , you can use its java.util.logging.FileHandler to

In order to use logging in a small Java desktop application I'm trying to understand in depth the operation of some methods. I use a very stupid and small Java program to test them. In particular, when testing the behaviour of the LogManager.readConfiguration() method I've found something strange. In all tests the LogManager reads its configuration from the properties files located in lib/logging.properties in the JRE directory. At this time, the contents of this file is as follows : handlers=java.util.logging.ConsoleHandler myapp2.handlers=java.util.logging.ConsoleHandler myapp2.MyApp2

I'm using java.util.logging on GlassFish 4. I'm defining my own class to initialize the LogManager by defining the System property: -Djava.util.logging.config.class . My class loads the logging.properties file, merges it with some other property file and does some custom replacement. The following is the relevant part of my logging.properties file: java.util.logging.FileHandler.pattern=C:/Work/server/glassfish/domains/domain1/logs/JMSFileHandler%g.log java.util.logging.FileHandler.limit=2000000 java.util.logging.FileHandler.count=20 java.util.logging.FileHandler.append=true java.util.logging