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java.lang.NullPointerException at UploadServlet.doPost(UploadServlet.java) at javax.servlet.http.HttpServlet.service(HttpServlet.java) at javax.servlet.http.HttpServlet.service(HttpServlet.java) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java) at java.lang.Thread.run(Thread.java)