SLF4J Manual.pdf - SLF4J Project Introduction Download Documentation License News Support Mailing Lists Bug Reporting Source Repository Support

SLF4J Manual.pdf - SLF4J Project Introduction Download...

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SLF4J Project Introduction Download Documentation License News Support Mailing Lists Bug Reporting Source Repository Support offerings Training Native implementations Logback Wrapped implementations AVSL JDK14 Log4j Simple Android Sub­projects slf4j­taglib build build passing passing
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; SLF4J user manual The Simple Logging Facade for Java (SLF4J) serves as a simple facade or abstraction for various logging frameworks, such as java.util.logging, logback and log4j. SLF4J allows the end­user to plug in the desired logging framework at deployment time. Note that SLF4J­enabling your library/application implies the addition of only a single mandatory dependency, namely slf4j­api­ 1.7.21.jar . since 1.6.0 If no binding is found on the class path, then SLF4J will default to a no­operation implementation. since 1.7.0 Printing methods in the Logger interface now offer variants accepting varargs instead of Object[] . This change implies that SLF4J requires JDK 1.5 or later. Under the hood the Java compiler transforms the varargs part in methods into Object[] . Thus, the Logger interface generated by the compiler is indistinguishable in 1.7.x from its 1.6.x counterpart. It follows that SLF4J version 1.7.x is totally 100% no­ifs­or­buts compatible with SLF4J version 1.6.x. since 1.7.5 Significant improvement in logger retrieval times. Given the extent of the Brooks Brothers Men's J.W. Hulme Leather Tablet And And Notebook Case $295.00 Shop now!
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improvement, users are highly encouraged to migrate to SLF4J 1.7.5 or later. since 1.7.9 By setting the slf4j.detectLoggerNameMismatch system property to true, SLF4J can automatically spot incorrectly named loggers . Hello World As customary in programming tradition, here is an example illustrating the simplest way to output "Hello world" using SLF4J. It begins by getting a logger with the name "HelloWorld". This logger is in turn used to log the message "Hello World". import org . slf4j . Logger ; import org . slf4j . LoggerFactory ; public class HelloWorld { public static void main ( String [] args ) { Logger logger = LoggerFactory . getLogger ( HelloWorld . class ); logger . info ( "Hello World" ); } } To run this example, you first need to download the slf4j distribution , and then to unpack it. Once that is done, add the file slf4j­api­1.7.21.jar to your class path. Compiling and running HelloWorld will result in the following output being printed on the console. SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". SLF4J: Defaulting to no‐operation (NOP) logger implementation SLF4J: See for further details. This warning is printed because no slf4j binding could be found on your class path. The warning will disappear as soon as you add a binding to your class path. Assuming you add slf4j­simple­1.7.21.jar so that your class path contains: slf4j­api­1.7.21.jar slf4j­simple­1.7.21.jar Compiling and running HelloWorld will now result in the following output on the console.
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  • Fall '19
  • SLF4J, SLF4J user manual

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