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Posted to users@wicket.apache.org by hillj2 <Hi...@michigan.gov> on 2007/09/20 19:09:48 UTC

Embedding wicket in jsp error

I know this has been discussed before, but none of the previous posts have
helped me solve my problem.  I'm trying to embed a wicket page into a jsp
page (until I have time go back and convert all our jsp's to wicket) using
the <jsp:include> tag.  oc4j throws a ServletException: Error in Servlet,
with no further information specifying the problem, nor any indication from
wicket that it's having a problem.  To isolate the problem I tried to
recreate it in a very small app, so I could rule out any issue with other
app code/configurations.  This time, I get a more informative (but not
necessarily more helpful) error message:

java.lang.IllegalStateException: Response has already been committed, be
sure not to write to the OutputStream or to trigger a commit due to any
other action before calling this method.

I'm hoping it's the same error in both cases, and the former case just has a
more generic error message for some reason; but I was hoping someone might
have a clue why I can't get the embedding to work.  I'm using oc4j 10.1.3.3,
and wicket beta2.  I tried it on Tomcat also.  It didn't throw an error, but
the place where the wicket content should be was just empty.

I'd prefer not to have to do this with embedded IFRAME's as I've seen
suggested.  That's the setup I have now, but when a page loads there's a
delay loading the IFRAME content, which doesn't look very nice, especially
since the embedded content is my app's navigation menu.  Any thoughts,
suggestions, alternate solutions to the embedding issue?

Here's the code from my small test app:

embed.jsp
========
<html>
 <head>
  <title>Embed test</title>
 </head>
 <body>
  <jsp:include page="/wicket/" flush="true">
  </jsp:include>
  <p>Here is my JSP content</p>
 </body>
</html>

EmbedServlet.java
==============
public class EmbedServlet extends HttpServlet {

  public void doGet(HttpServletRequest request, HttpServletResponse
response)
    throws ServletException, IOException {
    doPost(request, response);
  }

  public void doPost(HttpServletRequest request, HttpServletResponse
response)
    throws ServletException, IOException {

    RequestDispatcher rd  =
request.getRequestDispatcher("/WEB-INF/jsp/embed.jsp");
    rd.forward(request, response);

  }

}

EmbedApplication.java
=================
public class EmbedApplication extends WebApplication {

  public EmbedApplication() {
    super();
  }

  public Class getHomePage() {
    return EmbedPage.class;
  }

  protected void init() {
    System.out.println("***** Wicket App initialized *****");
  }

}

EmbedPage.java
============
public class EmbedPage extends WebPage {
  public EmbedPage() {
    super();
  }
}

EmbedPage.html
============
<html>
 <head>
  <title>Embeded Wicket</title>
 </head>
 <body>
  <p>Here is my wicket content.</p>
 </body>
</html>

web.xml
======
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application
2.2//EN" 
  "http://java.sun.com/j2ee/dtds/web-app_2.2.dtd">
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee">
  <servlet>
    <servlet-name>EmbedServlet</servlet-name>
    <servlet-class>EmbedServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>EmbedServlet</servlet-name>
    <url-pattern>/main</url-pattern>
  </servlet-mapping>
  <servlet>
    <servlet-name>EmbedApplication</servlet-name>
   
<servlet-class>org.apache.wicket.protocol.http.WicketServlet</servlet-class>
    <init-param>
      <param-name>applicationClassName</param-name>
      <param-value>EmbedApplication</param-value>
    </init-param>
  </servlet>
  <servlet-mapping>
    <servlet-name>EmbedApplication</servlet-name>
    <url-pattern>/wicket/*</url-pattern>
  </servlet-mapping>
  <session-config>
    <session-timeout>35</session-timeout>
  </session-config>
  <mime-mapping>
    <extension>html</extension>
    <mime-type>text/html</mime-type>
  </mime-mapping>
  <mime-mapping>
    <extension>txt</extension>
    <mime-type>text/plain</mime-type>
  </mime-mapping>
</web-app>



Thanks,
Joel
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