java:log4j
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java:log4j [2009/10/20 14:43] Alexander Rind log4j.properties |
java:log4j [2012/01/04 10:30] (current) Alexander Rind link newer logging packes |
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| log4j.logger.gui.MainFrame=INFO | log4j.logger.gui.MainFrame=INFO | ||
| </file> | </file> | ||
| + | |||
| + | <code java> | ||
| + | try { | ||
| + | if ((new File("log4j.properties")).canRead()) | ||
| + | PropertyConfigurator.configure("log4j.properties"); | ||
| + | } | ||
| + | catch (SecurityException e) { | ||
| + | } | ||
| + | </code> | ||
| ===== Rationale ===== | ===== Rationale ===== | ||
| Line 46: | Line 55: | ||
| Read more opinions [[http://www.google.at/search?q=log4j+java.util.logging]] | Read more opinions [[http://www.google.at/search?q=log4j+java.util.logging]] | ||
| + | |||
| + | Integrate JUL into log4j: | ||
| + | * http://shrubbery.mynetgear.net/c/display/W/Routing%2Bjava.util.logging%2Bmessages%2Bto%2BLog4J | ||
| + | * http://people.apache.org/~psmith/logging.apache.org/sandbox/jul-log4j-bridge/examples.html | ||
| + | * use SLF4J | ||
| === log4j vs. Commons Logging === | === log4j vs. Commons Logging === | ||
| [[http://commons.apache.org/logging/ | Commons Logging]] seems to be a compatibility layer so that a library can work with different logging implementations. | [[http://commons.apache.org/logging/ | Commons Logging]] seems to be a compatibility layer so that a library can work with different logging implementations. | ||
| + | |||
| + | === newer logging packages === | ||
| + | |||
| + | * [[http://www.slf4j.org/ | Simple Logging Facade for Java (SLF4J)]] | ||
| + | * [[http://www.slf4j.org/nlog4j/ | NLOG4J]] --- discontinued | ||
| + | * [[http://logback.qos.ch/ | Logback]] --- planned as successor of log4j and nlog4j | ||
| Line 57: | Line 77: | ||
| If the program reads a ''log4.properties'' file from the file system, | If the program reads a ''log4.properties'' file from the file system, | ||
| the file will likely get lost and users will be confronted with a ''FileNotFoundException'' | the file will likely get lost and users will be confronted with a ''FileNotFoundException'' | ||
| - | and might not be able to run the program. | + | or might not be able to run the program. |
| Here is a solution that works well for me: | Here is a solution that works well for me: | ||
| Line 65: | Line 85: | ||
| * if you create a jar-file, this will be the root directory of the jar-file | * if you create a jar-file, this will be the root directory of the jar-file | ||
| * for the default settings use minimal logging (e.g., ConsoleAppender, WARN level) | * for the default settings use minimal logging (e.g., ConsoleAppender, WARN level) | ||
| - | - a customized ''log4j.properties'' file is located in the working directory | + | - a customized ''log4j.properties'' file can be located in the working directory |
| * if you work with Eclipse, this will be the project directory | * if you work with Eclipse, this will be the project directory | ||
| - in the main method **check, whether ''log4j.properties'' exists** in the working directory | - in the main method **check, whether ''log4j.properties'' exists** in the working directory | ||
| - | * if it exist, then load this file | + | * if it exist and is readable, then load this file |
| + | * handle SecurityException (e.g., for Java Web Start) | ||
| * if it does not exist, log4j will load the file from the classpath by default | * if it does not exist, log4j will load the file from the classpath by default | ||
| - if users want to override this behavior, they can | - if users want to override this behavior, they can | ||
java/log4j.1256042637.txt · Last modified: 2009/10/20 14:43 by Alexander Rind
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