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org.apache.jasper.JasperException: javax.servlet.ServletException: javax.servlet.jsp.JspException: ServletException in '/layouts/_layout_details.jsp': javax.servlet.jsp.JspException: ServletException in '/board/HitBoard.jsp': java.lang.NullPointerException at org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:506) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:412) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:321) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267) at javax.servlet.http.HttpServlet.service(HttpServlet.java:723) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302) at com.hit.board.HitBoard.doGet(HitBoard.java:351) at javax.servlet.http.HttpServlet.service(HttpServlet.java:617) at javax.servlet.http.HttpServlet.service(HttpServlet.java:723) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.valves.RequestFilterValve.process(RequestFilterValve.java:338) at org.apache.catalina.valves.RemoteAddrValve.invoke(RemoteAddrValve.java:118) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:617) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:610) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:503) at java.lang.Thread.run(Thread.java:745) Caused by: javax.servlet.ServletException: javax.servlet.jsp.JspException: ServletException in '/layouts/_layout_details.jsp': javax.servlet.jsp.JspException: ServletException in '/board/HitBoard.jsp': java.lang.NullPointerException at org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:868) at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:797) at org.apache.jsp.company.invest_jsp._jspService(invest_jsp.java:77) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:723) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:388) ... 27 more Caused by: javax.servlet.jsp.JspException: ServletException in '/layouts/_layout_details.jsp': javax.servlet.jsp.JspException: ServletException in '/board/HitBoard.jsp': java.lang.NullPointerException at org.apache.struts.taglib.tiles.InsertTag$InsertHandler.doEndTag(InsertTag.java:921) at org.apache.struts.taglib.tiles.InsertTag.doEndTag(InsertTag.java:460) at org.apache.jsp.company.invest_jsp._jspx_meth_tiles_005finsert_005f0(invest_jsp.java:121) at org.apache.jsp.company.invest_jsp._jspService(invest_jsp.java:70) ... 30 more ----------------- :