Using log4j2 with slf4j: java.lang.StackOverflowError

Question

So I tried to follow this (not a maven implementation) and the requirements on their website to add slf4j to log4j. and tried to use this code

public static void main(String[] args) {
        Logger logger = LoggerFactory.getLogger(Main.class);
        logger.info("test");
    }

and added the following to my library

• log4j-api-2.3.jar
• log4j-core-2.3.jar
• log4j-sl4j-osusch-2.3.jar
• log4j to sl4j-2.3.jar
• SLF4J-api-1.7.12.jar

when i try to run it i get the following error

Exception in thread "main" java.lang.StackOverflowError
    at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:936)
    at java.util.concurrent.ConcurrentHashMap.containsKey(ConcurrentHashMap.java:964)
    at org.apache.logging.slf4j.SLF4JLoggerContext.getLogger(SLF4JLoggerContext.java:40)
    at org.apache.logging.slf4j.Log4jLoggerFactory.newLogger(Log4jLoggerFactory.java:37)
    at org.apache.logging.slf4j.Log4jLoggerFactory.newLogger(Log4jLoggerFactory.java:29)
    at org.apache.logging.log4j.spi.AbstractLoggerAdapter.getLogger(AbstractLoggerAdapter.java:47)
    at org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:29)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:284)
    at org.apache.logging.slf4j.SLF4JLoggerContext.getLogger(SLF4JLoggerContext.java:41)
    at org.apache.logging.slf4j.Log4jLoggerFactory.newLogger(Log4jLoggerFactory.java:37)
    at org.apache.logging.slf4j.Log4jLoggerFactory.newLogger(Log4jLoggerFactory.java:29)
    at org.apache.logging.log4j.spi.AbstractLoggerAdapter.getLogger(AbstractLoggerAdapter.java:47)
    at org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:29)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:284)...

Any ideas where I am going wrong?

Answer 1

You create a call loop with log4j-slf4j-impl-2.3.jarand log4j-to-slf4j-2.3.jar.

log4j-slf4j-impl-2.3.jar is an implementation of an adapter that sends slf4j calls to log4j.

log4j-to-slf4j-2.3.jar log4j slf4j. .

Answer 2

https://www.slf4j.org/codes.html#multiple_bindings log4j :-)