Log4j2 doesn't work

[renoseven]

Hi there, I found that the log4j2 doesn't work.

Here's the console output: com.mchange.v2.log.MLog 'com.mchange.v2.log.log4j.Log4jMLog' could not be loaded! java.lang.ClassNotFoundException: org.apache.log4j.Logger

My log4j version is 2.10.0, which logger class is changed to org.apache.logging.log4j.Logger

[missedone]

As a workaround, you can add the adapter jar https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-1.2-api

[KorSV]

Hi, how to configure c3p0 to use log4j2? If I call System.setProperty ("com.mchange.v2.log.MLog", "com.mchange.v2.log.log4j.Log4jMLog") then log4j is used

[sfieten]

Hi, to use Log4j2 you need to use either com.mchange.v2.log.log4j2.Log4j2MLog or log4j2 as value for the com.mchange.v2.log.MLog system property. But please note that this is only supported in mchange-commons version 2.15 (see Installation section in documentation) and that the Maven pom for version 0.9.5.2 of c3p0 only references 0.2.11. So if you're using Maven to create you lib add the 0.2.15 as an direct dependency.

[swaldman]

Thanks for addressing this @sfieten!

Using new-ish version of c3p0

com.mchange.v2.log.MLog=log4j2

should take care of this.

See https://www.mchange.com/projects/c3p0/#configuring_logging