Error: java.lang.NullPointerException
At:
      com.hof.jsp.pdf_jsp._jspService(pdf_jsp.java:113)
      org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:779)
      org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227)
      org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
      com.hof.servlet.CSSScopingFilter.doFilter(CSSScopingFilter.java:53)
      org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
      org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
      com.hof.servlet.SessionTimeoutFilter.doFilter(SessionTimeoutFilter.java:69)
      org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
      org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
      com.hof.servlet.CORSHeaderFilter.doFilter(CORSHeaderFilter.java:43)
      org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
      org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
      org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
      org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
      org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
      org.apache.logging.log4j.web.Log4jServletFilter.doFilter(Log4jServletFilter.java:64)
      org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
      org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
      org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:711)
      org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:459)
      org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:385)
      org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:313)
      org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:171)
      org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:316)
      org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1401)
      org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1145)
      org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1084)
      org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963)
      org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
      org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:696)
      org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:779)
      org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227)
      org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
      com.hof.servlet.CSSScopingFilter.doFilter(CSSScopingFilter.java:53)
      org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
      org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
      com.hof.servlet.SessionTimeoutFilter.doFilter(SessionTimeoutFilter.java:69)
      org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
      org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
      com.hof.servlet.CORSHeaderFilter.doFilter(CORSHeaderFilter.java:43)
      org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
      org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
      org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
      org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
      org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
      com.hof.servlet.BrowserHeaderFilter.doFilter(BrowserHeaderFilter.java:43)
      org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
      org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
      org.apache.logging.log4j.web.Log4jServletFilter.doFilter(Log4jServletFilter.java:71)
      org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
      org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
      org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)
      org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
      org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
      org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)
      org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
      org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:687)
      org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
      org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:360)
      org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399)
      org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
      org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:893)
      org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1789)
      org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
      org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
      org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
      org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
      java.base/java.lang.Thread.run(Thread.java:829)