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org.apache.commons.logging.Log System Property
How to use org.apache.commons.logging.Log system property to change the default logger?
✍: FYIcenter.com
If you want to change the default logger, you can specify the system property org.apache.commons.logging.Log=SomeLoggerClass using the "-D" option when launching the JVM.
The following example runs the HelloCommonsLogging code with SimpleLog logger:
C:\fyicenter>java -cp .;C:\local\commons-logging-1.2\commons-logging-1.2.jar "-Dorg.apache.commons.logging.Log=org.apache.commons.logging.impl.SimpleLog" HelloCommonsLogging Log class: org.apache.commons.logging.impl.SimpleLog [FATAL] MyLogging - Hello - fatal [ERROR] MyLogging - Hello - error [WARN] MyLogging - Hello - warn [INFO] MyLogging - Hello - info
The following example runs the HelloCommonsLogging code with Jdk14Logger logger:
C:\fyicenter>java -cp .;C:\local\commons-logging-1.2\commons-logging-1.2.jar "-Dorg.apache.commons.logging.Log=org.apache.commons.logging.impl.Jdk14Logger" HelloCommonsLogging Log class: org.apache.commons.logging.impl.Jdk14Logger Nov 13, 2016 9:44:56 PM MyLogging main SEVERE: Hello - fatal Nov 13, 2016 9:44:56 PM MyLogging main SEVERE: Hello - error Nov 13, 2016 9:44:56 PM MyLogging main WARNING: Hello - warn Nov 13, 2016 9:44:56 PM MyLogging main INFO: Hello - info
The following example runs the HelloCommonsLogging code with Log4JLogger logger:
C:\fyicenter>java -cp .;C:\local\commons-logging-1.2\commons-logging-1.2.jar "-Dorg.apache.commons.logging.Log=org.apache.commons.logging.impl.Log4JLogger" HelloCommonsLogging Exception in thread "main" java.lang.ExceptionInInitializerError Caused by: org.apache.commons.logging.LogConfigurationException: User-specified log class 'org.apache.commons.logging.impl.Log4JLogger' cannot be found or is not useable. at org.apache.commons.logging.impl.LogFactoryImpl .discoverLogImplementation(LogFactoryImpl.java:804) at org.apache.commons.logging.impl.LogFactoryImpl .newInstance(LogFactoryImpl.java:541) at org.apache.commons.logging.impl.LogFactoryImpl .getInstance(LogFactoryImpl.java:292) at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:669) at HelloCommonsLogging.<clinit>(HelloCommonsLogging.java:5)
This exception is expected, because the Log4j JAR file is not specified.
⇒ What Is commons-logging.properties File?
⇐ Example of Default Apache Commons Logging
2017-05-29, 4164🔥, 0💬
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