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java.lang.NullPointerException: 	at	at undefined.Renamer1.Renamer(	at undefined.UpFileToServ6.doPost(	at javax.servlet.http.HttpServlet.service(	at javax.servlet.http.HttpServlet.service(	at com.caucho.server.http.FilterChainServlet.doFilter(	at com.caucho.server.http.Invocation.service(	at com.caucho.server.http.CacheInvocation.service(	at com.caucho.server.http.HttpRequest.handleRequest(	at com.caucho.server.http.HttpRequest.handleConnection(	at	at