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I'm using JUnit4 and Hibernate3 in my project. Hibernate depends on Slf4j and thus my project includes this library as well. Now I'd like to use Slf4j in unit tests in order to log supplementary testing information. Could you please provide a short example of how my unit test should look like in order to log just one line of text? Preferably without code duplication in multiple tests.
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Conclusion. So essentially, SLF4J does not replace Log4j, Both work together. SLF4j removes the tight coupling between the application and logging frameworks. It makes it easy to replace with any other logging framework in the future with a more capable library.
Comparison SLF4J and Log4j Unlike log4j, SLF4J (Simple Logging Facade for Java) is not an implementation of logging framework, it is an abstraction for all those logging frameworks in Java similar to log4J. Therefore, you cannot compare both. However, it is always difficult to prefer one between the two.
SLF4J based implementation of commons-logging wrapper APIs.
This is the main purpose of SLF4J (Simple Logging Facade for Java) – a logging abstraction which helps to decouple your application from the underlying logger by allowing it to be plugged in – at runtime. Of course, the flexibility that such an abstraction provides is the main reason to use SLF4J.
Why do you want to log things in your unit test? Unit tests should be pass/fail and should use the testing framework to indicate that. You don't want to be reading through output to see if the test passed or failed. And if it's failing, running it in your IDE/debugger is the best way to fix it.
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