javax.servlet.UnavailableException: Clase introuvable !!!!

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javax.servlet.UnavailableException: Clase introuvable !!!!
at undefined.Forum_bd2.init(Forum_bd2.java:23)
at javax.servlet.GenericServlet.init(GenericServlet.java:266)
at com.sun.web.core.ServletWrapper.loadServlet(ServletWrapper.java:101)
at com.sun.web.core.ServletWrapper.handleRequest(ServletWrapper.java:119)
at com.sun.web.core.InvokerServlet.service(InvokerServlet.java:168)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:840)
at com.sun.web.core.ServletWrapper.handleRequest(ServletWrapper.java:155)
at com.sun.web.core.Context.handleRequest(Context.java:414)
at com.sun.web.server.ConnectionHandler.run(ConnectionHandler.java:139)

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