Failing to compile Tomcat's index.jsp example

StackOverflow https://stackoverflow.com/questions/22919854

Question

Whenever I try to run the index.jsp example provide by Tomcat on /jsp/security/protected, I get the following error:

type Exception report

message Unable to compile class for JSP:

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: Unable to compile class for JSP: 

An error occurred at line: 31 in the jsp file: /index.jsp
util.HTMLFilter cannot be resolved to a type
28: <body bgcolor="white">
29: 
30: You are logged in as remote user
31: <b><%= util.HTMLFilter.filter(request.getRemoteUser()) %></b>
32: in session <b><%= session.getId() %></b><br><br>
33: 
34: <%


An error occurred at line: 38 in the jsp file: /index.jsp
util.HTMLFilter cannot be resolved to a type
35:   if (request.getUserPrincipal() != null) {
36: %>
37:     Your user principal name is
38:     <b><%= util.HTMLFilter.filter(request.getUserPrincipal().getName()) %></b>
39:     <br><br>
40: <%
41:   } else {


An error occurred at line: 56 in the jsp file: /index.jsp
util.HTMLFilter cannot be resolved to a type
53:     if (request.isUserInRole(role)) {
54: %>
55:       You have been granted role
56:       <b><%= util.HTMLFilter.filter(role) %></b><br><br>
57: <%
58:     } else {
59: %>


An error occurred at line: 61 in the jsp file: /index.jsp
util.HTMLFilter cannot be resolved to a type
58:     } else {
59: %>
60:       You have <i>not</i> been granted role
61:       <b><%= util.HTMLFilter.filter(role) %></b><br><br>
62: <%
63:     }
64:   }


An error occurred at line: 70 in the jsp file: /index.jsp
util.HTMLFilter cannot be resolved to a type
67: To check whether your username has been granted a particular role,
68: enter it here:
69: <form method="GET" action='<%= response.encodeURL("index.jsp") %>'>
70: <input type="text" name="role" value="<%= util.HTMLFilter.filter(role) %>">
71: </form>
72: <br><br>
73: 


Stacktrace:
    org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:103)
    org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:366)
    org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:476)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:378)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:353)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:340)
    org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:657)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:357)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

The code of the file is 

<%
  if (request.getParameter("logoff") != null) {
    session.invalidate();
    response.sendRedirect("index.jsp");
    return;
  }
%>
<html>
<head>
<title>Protected Page for Examples</title>
</head>
<body bgcolor="white">

You are logged in as remote user
<b><%= util.HTMLFilter.filter(request.getRemoteUser()) %></b>
in session <b><%= session.getId() %></b><br><br>

<%
  if (request.getUserPrincipal() != null) {
%>
    Your user principal name is
    <b><%= util.HTMLFilter.filter(request.getUserPrincipal().getName()) %></b>
    <br><br>
<%
  } else {
%>
    No user principal could be identified.<br><br>
<%
  }
%>

<%
  String role = request.getParameter("role");
  if (role == null)
    role = "";
  if (role.length() > 0) {
    if (request.isUserInRole(role)) {
%>
      You have been granted role
      <b><%= util.HTMLFilter.filter(role) %></b><br><br>
<%
    } else {
%>
      You have <i>not</i> been granted role
      <b><%= util.HTMLFilter.filter(role) %></b><br><br>
<%
    }
  }
%>

To check whether your username has been granted a particular role,
enter it here:
<form method="GET" action='<%= response.encodeURL("index.jsp") %>'>
<input type="text" name="role" value="<%= util.HTMLFilter.filter(role) %>">
</form>
<br><br>

If you have configured this app for form-based authentication, you can log
off by clicking
<a href='<%= response.encodeURL("index.jsp?logoff=true") %>'>here</a>.
This should cause you to be returned to the logon page after the redirect
that is performed.

</body>
</html>

As I assume it's a well tested example, I guess I'm missing something, a library or something. What could be the problem?

The JAAS implementation is OK, because I can login if I point directly at the login.jsp

Était-ce utile?

La solution

Based on the log, the JSP engine was not able to find the class util.HTMLFilter.

If it's a 3rd party then the jar file should be there in WEB-INF/lib, if it's the class that you write then the compiled *.class file should be there in WEB-INF/classes and the package name should be correct.

Autres conseils

The relevant error message says 

util.HTMLFilter cannot be resolved to a type

So you should check if you have a package util, a class HTMLFilter in that package and that all the dependencies that HTMLFilter has are met, e.g. all members of that class are on the classpath as well.

You need to insert it to the JSP page at the top

<%@ page import="util.HTMLFilter" %>

Without it JSP won't compile a class referenced in the underline code.

More precisely, all you need to do is copy the HTMLFilter.java source file from WEB-INF/classes/util/, and place it in your corresponding Eclipse src/util/HTMLFilter.java (creating directories as needed), right-click on project, Build Project, and you're good to go.

If you're not using Eclipse, then just copy the HTMLFilter.class from the same directory into your corresponding WEB-INF/classes/util/ directory.

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