在slf4j中使用log4j2: java.lang.StackOverflowError[英] Using log4j2 with slf4j: java.lang.StackOverflowError

问题描述

So I have tried following this (non-maven implementation) and requirements in their web site for adding slf4j to log4j. and tried using 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-impl-2.3.jar
• log4j-to-sl4j-2.3.jar
• slf4j-api-1.7.12.jar

when I try running 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 idea where I am going wrong?

推荐答案

You're creating a call-loop with log4j-slf4j-impl-2.3.jar and log4j-to-slf4j-2.3.jar.

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

log4j-to-slf4j-2.3.jar is sending log4j calls right back to slf4j. Remove this one.

其他推荐答案

Just in case, if you have logback in your classpath, it must be removed as well!

其他推荐答案

Idea 1:

The above answer works. Mine was a multi module project and the log4j-to-slf4j-2.3.jar dependency was being by pulled by a different project. I had to scan each project to figure which project was pulling in this. I used the following command to do at a project level.

gradlew common:dependencies --configuration runtime

common is the name of the project configuration runtime - you can change this to suit your need

Idea 2:

If you are using spring which has multi module projects. Then you can simply add the following config in every subproject's build.gradle or dependency.gradle

configurations {
    all*.exclude group: 'org.springframework.boot', module: 'spring-boot-starter-logging'
}