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javax.servlet.UnavailableException: Clase introuvable !!!!	at Forum_bd2.init(	at javax.servlet.GenericServlet.init(	at com.sun.web.core.ServletWrapper.loadServlet(	at com.sun.web.core.ServletWrapper.handleRequest(	at com.sun.web.core.InvokerServlet.service(	at javax.servlet.http.HttpServlet.service(	at com.sun.web.core.ServletWrapper.handleRequest(	at com.sun.web.core.Context.handleRequest(	at