http://bugzilla.slf4j.org/show_bug.cgi?id=182 Summary: slf4j-ext requires JDK version higher than 1.4 Product: SLF4J Version: 1.5.x Platform: All OS/Version: All Status: NEW Severity: blocker Priority: P1 Component: slf4j-ext AssignedTo: slf4j-dev@qos.ch ReportedBy: victor.ott@googlemail.com I looked at the docs and mailing lists, and as far as I can see JDK 1.3 is the main target version for SLF4J. Nevertheles, I didn't find any statement for SLF4J-EXT: http://slf4j.org/faq.html#requirements Plain proof of concept: C:\java\libs\logging\slf4j\slf4j-1.5.11>java -version java version "1.4.2_18" [...] C:\java\libs\logging\slf4j\slf4j-1.5.11>java -cp slf4j-ext-1.5.11.jar org.slf4j.profiler.Profiler Exception in thread "main" java.lang.UnsupportedClassVersionError: org/slf4j/profiler/Profiler (Unsupported major.minor version 49.0) [...] -- Configure bugmail: http://bugzilla.slf4j.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug.