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java.lang.NullPointerException at java.io.File.<init>(File.java:220) at Renamer1.Renamer(Renamer1.java:21) at UpFileToServ6.doPost(UpFileToServ6.java:52) at javax.servlet.http.HttpServlet.service(HttpServlet.java:760) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at com.caucho.server.http.FilterChainServlet.doFilter(FilterChainServlet.java:96) at com.caucho.server.http.Invocation.service(Invocation.java:312) at com.caucho.server.http.CacheInvocation.service(CacheInvocation.java:135) at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:244) at com.caucho.server.http.HttpRequest.handleConnection(HttpRequest.java:163) at com.caucho.server.TcpConnection.run(TcpConnection.java:137) at java.lang.Thread.run(Thread.java:536)