I generated a smtp appender with my evaluator. in logBack.xml I have <appender name="Email" class="ch.qos.logback.classic.net.SMTPAppender"> <evaluator class="util.log.LogSMTPEvaluator"/> <smtpHost>${correo.name.direccionSMTP}</smtpHost> <to>${correo.name.to}</to> <from>${correo.name.from}</from> <username>${correo.name.usuario}</username> <password>${correo.name.clave}</password> <layout class="ch.qos.logback.classic.html.HTMLLayout"> <pattern>%d{yyyy-MM-dd HH:mm:ss}==> %m%n</pattern> </layout> </appender> When I deploy in integrated Weblogic Server with Jdeveloper11 it works fine. But, when i generated ear and deploy over my Weblogic Server i get: 12:32:57,830 |-ERROR in ch.qos.logback.core.joran.action.NestedComplexPropertyIA - Could not create component [evaluator] of type [util.log.LogSMTPEvaluator] java.lang.ClassNotFoundException: util.log.LogSMTPEvaluator at java.lang.ClassNotFoundException: util.log.LogSMTPEvaluator My aplication.ear have: - model.jar - logback-access-1.0.0.jar - logback-classic-1.0.0.jar - logback-core-1.0.0.jar - anothers jar libraries - view.war logback.xml is in view.war/WEB-INF/log-back.xml and util.log.LogSMTPEvaluator in model.jar. LogBack is initialize in a servlet init in view.war Any idea? -- View this message in context: http://old.nabble.com/Class-not-found-exception-for-Evaluator-tp33187958p331... Sent from the Logback User mailing list archive at Nabble.com.