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Compiling Program with Apache Log4j
How to compile my program with Log4j 2.4.1? My program uses Log4j 2 API only and I want to know which JAR file is needed to compile it.
✍: FYIcenter.com
If your program is using Log4j 2 API, you need to compile it with only the Log4j 2 API JAR, like log4j-api-2.14.1.jar.
If you are using older versions of JDK, you may need to use older releases of Log4j 2 API JAR. See the JDK compatibility table below:
Release JDK Date ------- --- ---------- Apache Log4j 2.14.1 8 2021-03-12 Apache Log4j 2.12.1 7 2020-07-03 Apache Log4j 2.3 6 2020-07-03
Here is a compilation session with the HelloLog4j2.java program provided in the last tutorial. You see compilation errors, because Log4j 2 API JAR is not provided.
fyicenter> java -version java version "15" 2020-09-15 fyicenter> javac HelloLog4j2.java HelloLog4j2.java:4: error: cannot find symbol private static final Logger logger = LogManager.getLogger("fyiLogger"); ^ symbol: class Logger location: class HelloLog4j2 HelloLog4j2.java:2: error: package org.apache.logging.log4j does not exist import org.apache.logging.log4j.*; ^ HelloLog4j2.java:4: error: cannot find symbol private static final Logger logger = LogManager.getLogger("fyiLogger"); ^ symbol: variable LogManager location: class HelloLog4j2 3 errors
Compile it again with Log4j 2 API JAR provided. You see bytecode file generated.
fyicenter> javac -cp log4j-api-2.14.1.jar HelloLog4j2.java fyicenter> dir 1584 Jul 4 14:19 HelloLog4j2.class
The above session shows that:
⇒ Running Program with Apache Log4j
⇐ Hello Program with Apache Log4j
2015-11-18, 3267🔥, 0💬
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