Re: how to look up java:comp/env

[Mark R. Diggory]

I was thinking about this last weekend. I did finally work through some 
of the examples with the JNDI taglibrary. There are examples in the 
usage of that jndi taglibrary that show both the resources and the env 
available to a webapplications under:

java:comp/...

The simplest example of navigating this hierarchy using the jndi taglib 
is this:

<%@ page errorPage="/Error/ErrorPage.jsp" %>
<%@ taglib uri="http://jakarta.apache.org/taglibs/jndi-1.0"; prefix="jndi" %>
<%
String name = request.getParameter("name") != null ? 
request.getParameter("name") : "";
String url = request.getParameter("url") != null ? 
request.getParameter("url") : "java:comp";
%>

<jndi:useContext id="test" url='<%=url%>'/>
The Context is <%=test.toString()%>"<BR/>
			
<table border="true">
<th>name</th><th>full name</th><th>class</th><th>toString of Object</th>
  <jndi:list
    contextRef='test'
    name='<%=name%>'
    nameId="aName"
    classId="aClass"
    objId="anObj"
    bindings="false"
  >
<%
    String nextContext, dn;
    if (anObj instanceof javax.naming.Context) {
        nextContext = ((javax.naming.Context)anObj).composeName(aName, 
request.getParameter("name"));
        dn = ((javax.naming.Context)anObj).getNameInNamespace();
%>
	<tr>
      <td><%=aName%><BR/>
      	  <A href='?url=<%=url%>&name=<%=nextContext%>'>[list]</a>
      <td><%=dn%></td>
      <td><%=aClass%></td>
      <td><%=anObj%></td>
    </tr>
<%    } else {
        nextContext=test.composeName(aName, name);
        dn = "N/A";
%>
	<tr>
      <td><%=aName%><BR/>
      	  <A href='?url=<%=url%>&name=<%=nextContext%>'>[list]</a>
      <td><%=dn%></td>
      <td><%=aClass%></td>
      <td><%=anObj%></td>
    </tr>

<%}%>
  </jndi:list>
</table>
This thread in archive:
http://www.mail-archive.com/[EMAIL PROTECTED]/msg05920.html
--
Mark Diggory
Software Developer
Harvard MIT Data Center
http://osprey.hmdc.harvard.edu
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