Simple Logger

A simple but useful Java logger to use everywhere.

Current version v1.3.1

Download

simplelogger-1.3.1.jar

How to use

Initialization :

Logger.init("logging.properties", Level.WARNING);
// or
Logger.init("logging.properties");
Logger.setLevel(Level.WARNING);

Configuration file as follow (example) :

# Parameters for good behavior
handlers=java.util.logging.ConsoleHandler
.level=WARNING
java.util.logging.ConsoleHandler.formatter=java.util.logging.SimpleFormatter

# Customize date/time shown with this line
java.util.logging.SimpleFormatter.format=[%1$tF %1$tT][%4$s]%5$s %n

# Specify your app name here
app_name=YourApp
# (Optional, specify your app package)
default_package=com.your.app
# (Optional, specify an output file pattern)
output_file=output.log

The default package works as follow : When logging stack trace of an error, it will stop when the package doesnt't match your app anymore. It helps having small and relevant stack trace in logs.

Usage :

//general logging
Logger.log("my message"); //INFO log
Logger.log("my message : {0}", 123); //INFO log with parameters
Logger.log(Level.WARNING, "my message"); //custom level log
Logger.log(Level.SEVERE, "my message : {0}-{1}", 123, 456); //custom level log with parameters
//exception logging
Logger.log(exception1); //SEVERE logging with stack trace
Logger.log(exception2, "exception when doing task"); //SEVERE logging with stack trace and message
Logger.log(Level.WARNING, exception3); //custom level logging without stack trace
Logger.log(Level.INFO, exception4, "exception when doing task"); //custom level logging with message

This will show the following :

[INFO][MyApp-CallingClass] my message
[INFO][MyApp-CallingClass] my message : 123
[WARNING][MyApp-CallingClass] my message
[SEVERE][MyApp-CallingClass] my message : 123-456
[SEVERE][MyApp-CallingClass] (exception1.toString)
[SEVERE][MyApp-CallingClass]    (exception1.stackTrace)
[SEVERE][MyApp-CallingClass]    (exception1.stackTrace)
[SEVERE][MyApp-CallingClass]    ...
[SEVERE][MyApp-CallingClass] exception when doing task : (exception2.toString)
[SEVERE][MyApp-CallingClass]    (exception2.stackTrace)
[SEVERE][MyApp-CallingClass]    (exception2.stackTrace)
[SEVERE][MyApp-CallingClass]    ...
[WARNING][MyApp-CallingClass] (exception3.toString)
[INFO][MyApp-CallingClass] exception when doing task : (exception4.toString)

Maven

You can use this project as a maven dependency with this :

<dependency>
    <groupId>com.github.klemek</groupId>
    <artifactId>simple-logger</artifactId>
    <version>1.3.1</version>
</dependency>