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Posted to users@tomcat.apache.org by Peiqiang Han <pe...@videotron.ca> on 2001/08/23 16:52:11 UTC
custom error page not working in TC40-b7
> I have some problems to make custome error pages working. I have done my test with TC40-b7
> on Linux Redhat 7.1 Kernel 2.4.2.
1) The servlet ErrorHandlingServlet.java is in $CATALINA_HOME/webapps/test/WEB-INF/classes:
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.IOException;
public class ErrorHandlingServlet extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
String param = req.getParameter("code");
if(param.equals("Servlet"))
throw new ServletException("ServletException thrown!!!");
else if(param.equals("Unavailable"))
throw new UnavailableException("UnavailableException");
else
res.sendError(404, "404 is returned");
}
}
2) The custom error pages are in $CATALINA_HOME/webapps/test/jsp/errorpage, an example is
errorpage.jsp:
<%@ page isErrorPage="true" %>
<html>
<body bgcolor="red">
<h1> The exception msg is <%= exception.getMessage() %> </h1>
</body>
</html>
3) The Deployment descriptor $CATALINA_HOME/webapps/test/WEB-INF/web.xml is configured as
follow:
<servlet>
<servlet-name>errorHandling</servlet-name>
<servlet-class>ErrorHandlingServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>errorHandling</servlet-name>
<url-pattern>/eHandling</url-pattern>
</servlet-mapping>
...
<error-page>
<exception-type>javax.servlet.ServletException</exception-type>
<location>/jsp/errorpage/errorpage.jsp</location>
</error-page>
<error-page>
<exception-type>java.lang.NullPointerException</exception-type>
<location>/jsp/errorpage/errorpageUn.jsp</location>
</error-page>
<error-page>
<error-code>404</error-code>
<location>/jsp/errorpage/errorpage404.jsp</location>
</error-page>
When I accessed the ErrorHandlingServlet with the URL:
http://localhost:8080/test/servlet/ErrorHandlingServlet?code=Servlet, I expected the TC to
return the custom error page /jsp/errorpage/errorpage.jsp. But it was the following page
returned:
A Servlet Exception Has Occurred
javax.servlet.ServletException: ServletException thrown!!!
at ErrorHandlingServlet.doGet(ErrorHandlingServlet.java:13)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
...
It is interesting to note that when I put the error-page tags just bellow the taglib tag, as
specified by the DTD, there was the following error message in the localhost_log.txt when TC
was startedup:
2001-08-23 19:48:47 ContextConfig[/test] Parse error in application web.xml
org.xml.sax.SAXParseException: Element "web-app" does not allow "error-page" here.
at org.apache.crimson.parser.Parser2.error(Parser2.java:3013)
at
org.apache.crimson.parser.ValidatingParser$ChildrenValidator.consume(ValidatingParser.java:349)
at org.apache.crimson.parser.Parser2.maybeElement(Parser2.java:1303)
...
So I have had to put error-page tags before the taglib tag, but the custom error page could
still not be shown. Have I missed somethings?
Regards
Peiqiang Han
Re: custom error page not working in TC40-b7
Posted by "Craig R. McClanahan" <cr...@apache.org>.
See intermixed.
On Thu, 23 Aug 2001, Peiqiang Han wrote:
> Date: Thu, 23 Aug 2001 19:52:11 +0500
> From: Peiqiang Han <pe...@videotron.ca>
> Reply-To: tomcat-user@jakarta.apache.org
> To: tomcat-user@jakarta.apache.org
> Subject: custom error page not working in TC40-b7
>
> > I have some problems to make custome error pages working. I have
> done my test with TC40-b7 > on Linux Redhat 7.1 Kernel 2.4.2.
>
> 1) The servlet ErrorHandlingServlet.java is in
> $CATALINA_HOME/webapps/test/WEB-INF/classes:
>
> import javax.servlet.*;
> import javax.servlet.http.*;
> import java.io.IOException;
>
> public class ErrorHandlingServlet extends HttpServlet {
>
> public void doGet(HttpServletRequest req, HttpServletResponse res)
> throws ServletException, IOException {
>
> String param = req.getParameter("code");
>
> if(param.equals("Servlet"))
> throw new ServletException("ServletException thrown!!!");
> else if(param.equals("Unavailable"))
> throw new UnavailableException("UnavailableException");
> else
> res.sendError(404, "404 is returned");
> }
>
> }
>
> 2) The custom error pages are in
> $CATALINA_HOME/webapps/test/jsp/errorpage, an example is
> errorpage.jsp:
>
> <%@ page isErrorPage="true" %>
>
> <html>
> <body bgcolor="red">
>
> <h1> The exception msg is <%= exception.getMessage() %> </h1>
> </body>
> </html>
>
Note that the "exception" variable will be set correctly only if the error
happened on a JSP page that used:
<%@ page errorPage="/errorpage.jsp" %>
at the top.
For exceptions thrown by a servlet, the details of the exception are
passed as request attributes that you can access from within the error
displaying page, as outlined in Section 9.9 of the Servlet 2.3 PFD2 spec
<http://java.sun.com/products/servlet/download.html>.
In particular, the actual exception thrown is passed under request
attribute "javax.servlet.error.exception" (of type Throwable).
> 3) The Deployment descriptor
> $CATALINA_HOME/webapps/test/WEB-INF/web.xml is configured as follow:
>
> <servlet>
> <servlet-name>errorHandling</servlet-name>
> <servlet-class>ErrorHandlingServlet</servlet-class>
> </servlet>
>
> <servlet-mapping>
> <servlet-name>errorHandling</servlet-name>
> <url-pattern>/eHandling</url-pattern>
> </servlet-mapping>
> ...
>
> <error-page>
> <exception-type>javax.servlet.ServletException</exception-type>
> <location>/jsp/errorpage/errorpage.jsp</location>
> </error-page>
> <error-page>
> <exception-type>java.lang.NullPointerException</exception-type>
> <location>/jsp/errorpage/errorpageUn.jsp</location>
> </error-page>
> <error-page>
> <error-code>404</error-code>
> <location>/jsp/errorpage/errorpage404.jsp</location>
> </error-page>
>
> When I accessed the ErrorHandlingServlet with the URL:
> http://localhost:8080/test/servlet/ErrorHandlingServlet?code=Servlet,
> I expected the TC to return the custom error page
> /jsp/errorpage/errorpage.jsp. But it was the following page returned:
>
> A Servlet Exception Has Occurred
>
> javax.servlet.ServletException: ServletException thrown!!!
> at ErrorHandlingServlet.doGet(ErrorHandlingServlet.java:13)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
> at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
>
> at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
> ...
>
I will look at this ... it should have gone to your errorpage.jsp page,
which would itself have thrown a null pointer exception (because
"exception" would not have been set). And error pages seem to work for
all of my unit test cases ...
> It is interesting to note that when I put the error-page tags just
> bellow the taglib tag, as specified by the DTD, there was the
> following error message in the localhost_log.txt when TC was
> startedup:
>
> 2001-08-23 19:48:47 ContextConfig[/test] Parse error in application web.xml
> org.xml.sax.SAXParseException: Element "web-app" does not allow "error-page" here.
> at org.apache.crimson.parser.Parser2.error(Parser2.java:3013)
> at
> org.apache.crimson.parser.ValidatingParser$ChildrenValidator.consume(ValidatingParser.java:349)
>
> at org.apache.crimson.parser.Parser2.maybeElement(Parser2.java:1303)
> ...
>
> So I have had to put error-page tags before the taglib tag, but the custom error page could
> still not be shown. Have I missed somethings?
According to the DTD I am looking at (in the PFD2 spec), <error-page> has
to come *before* <taglib> tags, not *after*.
>
>
> Regards
> Peiqiang Han
>
>
>
Craig McClanahan