Categories:
Audio (13)
Biotech (29)
Bytecode (36)
Database (77)
Framework (7)
Game (7)
General (507)
Graphics (53)
I/O (35)
IDE (2)
JAR Tools (102)
JavaBeans (21)
JDBC (121)
JDK (426)
JSP (20)
Logging (108)
Mail (58)
Messaging (8)
Network (84)
PDF (97)
Report (7)
Scripting (84)
Security (32)
Server (121)
Servlet (26)
SOAP (24)
Testing (54)
Web (15)
XML (322)
Collections:
Other Resources:
SLF4J Binding to Log4J Loger Example
How to use SLF4J API with Log4J Logger?
✍: Guest
If you want to use SLF4J API with JDK Logger,
you need specify slf4j-api-*.jar, slf4j-log4j*.jar and log4j-*.jar
in Java classpath as shown in this tutorial.
1. Write a simple Java program, Hello.java, to use SLF4J API:
// Copyright (c) FYIcenter.com import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class Hello { private static final Logger log = LoggerFactory.getLogger("fyiLog"); public static void main(String[] args) { System.out.println("Log class: "+log.getClass().getName()); log.error("Hello - error"); log.warn("Hello - warn"); log.info("Hello - info"); log.debug("Hello - debug"); log.trace("Hello - trace"); } }
2. Write a Log4J configuration file, log4j.properties, and keep it in the Java classpath.
# Root logger option log4j.rootLogger=INFO, file, stdout # Direct log messages to stdout log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target=System.out log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} [%t] %-5p:: %m%n # Direct log messages to a log file log4j.appender.file=org.apache.log4j.RollingFileAppender log4j.appender.file.File=Hello.log log4j.appender.file.layout=org.apache.log4j.PatternLayout log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} [%t] %-5p:: %m%n
3. Download a Log4J version that matches the SLF4J bridge version.
SLF4J bridge to Log4J 1.2: slf4j-log4j12-1.7.31.jar Log4J 1.2: slf4j-log4j12-1.7.31.jar
4. Run Hello.java with slf4j-api-1.7.31.jar, slf4j-log4j12-1.7.31.jar, slf4j-log4j12-1.7.31.jar and log4j.properties in the Java class path:
$ java -version java version "15" 2020-09-15 $ java -cp .:slf4j-api-1.7.31.jar:slf4j-log4j12-1.7.31.jar:log4j-1.2.17.jar Hello.java Log class: org.slf4j.impl.Log4jLoggerAdapter 07-04 19:46:58 [main] ERROR:: Hello - error 07-04 19:46:58 [main] WARN :: Hello - warn 07-04 19:46:58 [main] INFO :: Hello - info
5. Review the output:
⇒ SLF4J - Simple Logging Facade for Java
⇐ SLF4J Binding to JDK Loger Example
2021-12-23, ∼944🔥, 0💬
Popular Posts:
What Is poi-examples-5.2.3.jar? poi-examples-5.2.3.jar is one of the JAR files for Apache POI 5.2.3,...
What Is activation.jar? I heard it's related to JAF (JavaBeans Activation Framework) 1.0.2? The if y...
JDK 11 java.sql.jmod is the JMOD file for JDK 11 SQL (Structured Query Language) module. JDK 11 SQL ...
JDK 11 jdk.dynalink.jmod is the JMOD file for JDK 11 Dynamic Linking module. JDK 11 Dynamic Linking ...
kernel.jar is a component in iText Java library to provide low-level functionalities. iText Java lib...