500错误 javax.servlet.ServletException: javax.naming.NameNotFoundException: Name [happy] is not bound in this Context. Unable to find [happy].

HTTP Status 500 – Internal Server Error

Type Exception Report

Message An exception occurred processing JSP page [/index.jsp] at line [29]

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

org.apache.jasper.JasperException: An exception occurred processing JSP page [/index.jsp] at line [29]

26: <hr />
27: <%
28:    Context ctx=new InitialContext();
29:    String value=(String)ctx.lookup("java:comp/env/happy");
30:    
31: %>
32: <%=value %>


Stacktrace:
    org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:584)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:466)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
Root Cause

javax.servlet.ServletException: javax.naming.NameNotFoundException: Name [happy] is not bound in this Context. Unable to find [happy].
    org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:909)
    org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:838)
    org.apache.jsp.index_jsp._jspService(index_jsp.java:303)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:443)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
Root Cause

javax.naming.NameNotFoundException: Name [happy] is not bound in this Context. Unable to find [happy].
    org.apache.naming.NamingContext.lookup(NamingContext.java:816)
    org.apache.naming.NamingContext.lookup(NamingContext.java:159)
    org.apache.naming.NamingContext.lookup(NamingContext.java:827)
    org.apache.naming.NamingContext.lookup(NamingContext.java:159)
    org.apache.naming.NamingContext.lookup(NamingContext.java:827)
    org.apache.naming.NamingContext.lookup(NamingContext.java:173)
    org.apache.naming.SelectorContext.lookup(SelectorContext.java:163)
    javax.naming.InitialContext.lookup(InitialContext.java:417)
    org.apache.jsp.index_jsp._jspService(index_jsp.java:151)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:443)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
Note The full stack trace of the root cause is available in the server logs.

Apache Tomcat/8.5.20

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