Where do I configure log4j in a JUnit test class

Question

Looking at the last JUnit test case I wrote  I called log4j s BasicConfigurator configure   method inside the class constructor   That worked fine for running just that single class from Eclipse s  run as JUnit test case  command   But I realize it s incorrect  I m pretty sure our main test suite runs all of these classes from one process  and therefore log4j configuration should be happening higher up somewhere   But I still need to run a test case by itself some times  in which case I want log4j configured   Where should I put the configuration call so that it gets run when the test case runs standalone  but not when the test case is run as part of a larger suite

User · Accepted Answer

The LogManager class determines which log4j config to use in a static block which runs when the class is loaded   There are three options intended for end-users    If you specify log4j defaultInitOverride to false  it will not configure log4j at all  Specify the path to the configuration file manually yourself and override the classpath search  You can specify the location of the configuration file directly by using the following argument to java    -Dlog4j configuration  lt path to properties file gt   in your test runner configuration    Allow log4j to scan the classpath for a log4j config file during your test   the default     See also the online documentation

User · Answer

I use system properties in log4j xml        lt param name  File  value    catalina home  logs root log   gt        and start tests with    lt plugin gt       lt groupId gt org apache maven plugins lt  groupId gt       lt artifactId gt maven-surefire-plugin lt  artifactId gt       lt version gt 2 16 lt  version gt       lt configuration gt           lt systemProperties gt               lt property gt                   lt name gt catalina home lt  name gt                   lt value gt   project build directory  lt  value gt               lt  property gt           lt  systemProperties gt       lt  configuration gt   lt  plugin gt

User · Answer

I generally just put a log4j xml file into src test resources and let log4j find it by itself  no code required  the default log4j initialisation will pick it up   I typically want to set my own loggers to  DEBUG  anyway

User · Answer

You may want to look into to Simple Logging Facade for Java  SLF4J   It is a facade that wraps around Log4j that doesn t require an initial setup call like Log4j  It is also fairly easy to switch out Log4j for Slf4j as the API differences are minimal

[java] Where do I configure log4j in a JUnit test class?

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