Hi, I upgraded SLF4J to 1.5.3 to 1.5.4 and a message appears when launch my program : SLF4J: The version of your slf4j-binding is probably older than 1.5.4, and differs from 1.5.4, the expected version. SLF4J: See http://www.slf4j.org/codes.html#version_mismatch for further details. I red version_mismatch error but I do not found error in my configuration. I tried to unzip again the lib 1.5.4 and check the files and it seems all ok. This is the poperties from Eclipse launch with 1.5.4 C:\jdk160\bin\javaw.exe -Xmx512M -classpath C:\dnsvmware25\testvmware;D:\install\libExplode\axis1-4\wsdl4j-1.5.1.jar;D:\install\libExplode\axis1-4\activation.jar;D:\install\libExplode\axis1-4\jaxen-core.jar;D:\install\libExplode\axis1-4\jaxen-jdom.jar;D:\install\libExplode\axis1-4\jdom.jar;D:\install\libExplode\axis1-4\mailapi.jar;D:\install\libExplode\axis1-4\saxpath.jar;D:\install\libExplode\axis1-4\smtp.jar;D:\install\libExplode\axis1-4\wbem.jar;D:\install\libExplode\axis1-4\xalan.jar;D:\install\libExplode\axis1-4\xerces.jar;D:\install\libExplode\axis1-4\xml-apis.jar;D:\install\libExplode\axis1-4\axis.jar;D:\install\libExplode\axis1-4\axis-ant.jar;D:\install\libExplode\axis1-4\commons-discovery-0.2.jar;D:\install\libExplode\axis1-4\jaxrpc.jar;D:\install\libExplode\axis1-4\saaj.jar;D:\install\libExplode\logback\logback-access-0.9.9.jar;D:\install\libExplode\logback\logback-classic-0.9.9.jar;D:\install\libExplode\logback\logback-core-0.9.9.jar;D:\install\libExplode\logback\janino2_5_15.jar;D:\install\libExplode\vmware25\vim25.jar;D:\install\libExplode\vmware25\vim.jar;D:\install\libExplode\slf4j_154\jul-to-slf4j-1.5.4.jar;D:\install\libExplode\slf4j_154\log4j-over-slf4j-1.5.4.jar;D:\install\libExplode\slf4j_154\slf4j-api-1.5.4.jar;D:\install\libExplode\slf4j_154\jcl-over-slf4j-1.5.4.jar -agentlib:jdwp=transport=dt_socket,suspend=y,address=localhost:3903 test.ListPort This is the poperties from Eclipse launch with 1.5.3 C:\jdk160\bin\javaw.exe -Xmx512M -classpath C:\dnsvmware25\testvmware;D:\install\libExplode\axis1-4\wsdl4j-1.5.1.jar;D:\install\libExplode\axis1-4\activation.jar;D:\install\libExplode\axis1-4\jaxen-core.jar;D:\install\libExplode\axis1-4\jaxen-jdom.jar;D:\install\libExplode\axis1-4\jdom.jar;D:\install\libExplode\axis1-4\mailapi.jar;D:\install\libExplode\axis1-4\saxpath.jar;D:\install\libExplode\axis1-4\smtp.jar;D:\install\libExplode\axis1-4\wbem.jar;D:\install\libExplode\axis1-4\xalan.jar;D:\install\libExplode\axis1-4\xerces.jar;D:\install\libExplode\axis1-4\xml-apis.jar;D:\install\libExplode\axis1-4\axis.jar;D:\install\libExplode\axis1-4\axis-ant.jar;D:\install\libExplode\axis1-4\commons-discovery-0.2.jar;D:\install\libExplode\axis1-4\jaxrpc.jar;D:\install\libExplode\axis1-4\saaj.jar;D:\install\libExplode\logback\logback-access-0.9.9.jar;D:\install\libExplode\logback\logback-classic-0.9.9.jar;D:\install\libExplode\logback\logback-core-0.9.9.jar;D:\install\libExplode\logback\janino2_5_15.jar;D:\install\libExplode\vmware25\vim25.jar;D:\install\libExplode\vmware25\vim.jar;D:\install\libExplode\slf4j_153\slf4j-api-1.5.3.jar;D:\install\libExplode\slf4j_153\jcl-over-slf4j-1.5.3.jar;D:\install\libExplode\slf4j_153\jul-to-slf4j-1.5.3.jar;D:\install\libExplode\slf4j_153\log4j-over-slf4j-1.5.3.jar -agentlib:jdwp=transport=dt_socket,suspend=y,address=localhost:3891 test.ListPort Any Hint ? Thanks a lot for all