I understand this might not logback's issue, but I would like to collect more information so hope to fix my problem. Basically there is no problem to execute unit tests if I removed all logback related dependency. I am just wondering what inside jcl-over-slf4j may collide against dependencies in my project. I notice that when I add jcl-over-slf4j as dependency <dependency> <groupId>org.slf4j</groupId> <artifactId>jcl-over-slf4j</artifactId> <version>1.7.5</version> </dependency> this leads to my test case not being executed with maven result printed "no tests were executed!". My scala test version is 2.10 <dependency> <groupId>org.scalatest</groupId> <artifactId>scalatest_2.10</artifactId> <version>2.0</version> <scope>test</scope> </dependency> and junit version is 4.8.1 <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.8.1</version> </dependency> If I comment out jcl-over-slf4j, maven reports "there are tests failure" Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.6:test (default-test) ...: There are test failures Please refer to.../target/surefire-reports for the individual test results. But surefire-reports folder actually is not created $ ls target/surefire-reports ls: cannot access target/surefire-reports: No such file or directory Environment I use Maven version is 3.0.5 Java version 1.6.x I appreciate any suggestions. Thanks