Type Exception Report
Message An exception occurred processing [/index.jsp] at line [3]
Description The server encountered an unexpected condition that prevented it from fulfilling the request.
Exception
org.apache.jasper.JasperException: An exception occurred processing [/index.jsp] at line [3] 1: <%@ include file="header.jsp" %> 2: 3: <b><%=usernames.get(uid - 1)%></b><br/> 4: User ID: <%=uid%><br/><br/> 5: 6: Stacktrace: org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:593) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:482) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330) javax.servlet.http.HttpServlet.service(HttpServlet.java:741) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
Root Cause
java.lang.IndexOutOfBoundsException: Index -2 out of bounds for length 787 java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:64) java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:70) java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:248) java.base/java.util.Objects.checkIndex(Objects.java:372) java.base/java.util.ArrayList.get(ArrayList.java:459) org.apache.jsp.index_jsp._jspService(index_jsp.java:348) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) javax.servlet.http.HttpServlet.service(HttpServlet.java:741) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:444) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330) javax.servlet.http.HttpServlet.service(HttpServlet.java:741) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
Note The full stack trace of the root cause is available in the server logs.