This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
According to the SLF4J JavaDocs that method has existed since the 1.4 version of the API, so you should be good with 1.5.2 - however, you may have an older version of SLF4J on your classpath - make sure it's not included in any libraries you may be using in your application, or in libraries contained in the application server's libs.
Write once, run anywhere, because there's nowhere to hide! - /. A.C.