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This exception has no message.
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java.lang.NullPointerException at<init>( at Renamer1.Renamer( at 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