Using sjsws to host many small servlet/jsp sites on one server

Hello. I visited the web page at http://www.sun.com/software/products/web_srvr/features.xml, which mentions that sjsws supports mass hosting of thousands of domains. Anyone knows more information about this feature? I want to find out whether sjsws is a good choice for hosting many small servlet/jsp sites on one server.
Some time ago, I tried using apache+tomcat to host many small servlet/jsp sites on one server. But the result was not satisfactory. If a private tomcat/jvm is used for each site, too many resources are consumed and as a result, not many sites can be hosted on one server. If a shared tomcat/jvm is used for all sites, the resources consumed are reduced, but it becomes very difficult to isolate the sites. Is it possible to overcome such problems with sjsws?
Thx.

Of course you dont have to use multiple VMs to host multiple applications.
You can either choose to have multiple Virtual Servers, all in one instance of the web server, serving multiple applications. In this case only one java VM is used.
Or you can go in the route posted in the link above, in which there is only one "physical" virtual server, with many dynamic virtual servers.
Whether you chose to have many multiple web applications, or do the server division in a similar way to what is described in the blog, it is up to you.
Many different web applications will give you more fine level control on the application separation, but it will probably also mean greater resource consumption associated to the web application managing.
Less web applications, but with dynamic separation, in a similar way to what is described in the blog, will give a lesser control on the applications, but will save you a good number of resources.
SJS Web Server is known to work in massive web sites, with very high number of JSPs and Servlets. There is some real life examples of this massive hosting. Maybe others can provide some numbers here :P

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     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
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     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
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     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
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     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
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     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
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     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
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     org.apache.jsp.Questions_jsp._jspService(Questions_jsp.java:42)
     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
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     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)My web.xml file is as follows:
<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee/web-app_2_4.xsd"
version="2.4">
<display-name>Jsp_Ex09 - JSP Standard Tag Library</display-name>
<welcome-file-list>
<welcome-file>welcome.jsp</welcome-file>
</welcome-file-list>
<jsp-config>
<taglib>
<taglib-uri>/simplequestions</taglib-uri>
<taglib-location>/WEB-INF/tlds/simplefaq.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>http://java.sun.com/jsp/jstl/core</taglib-uri>
<taglib-location>/WEB-INF/tlds/c.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>http://java.sun.com/jsp/jstl/fmt</taglib-uri>
<taglib-location>/WEB-INF/tlds/fmt.tld</taglib-location>
</taglib>
<jsp-property-group>
<url-pattern>*.jsp</url-pattern>
<el-ignored>false</el-ignored>
<scripting-invalid>true</scripting-invalid>
</jsp-property-group>
</jsp-config>
</web-app>I have the standard and jstl jars in my lib directory and the relevant tlds files int the tlds directory. I am using Tomcat 5.5 and J2EE 5.
The jsp in question is as follows:
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%>
<html>
<head>
<title>JSTL Q2</title>
</head>
<body>
<h1>JSTL Question 2</h1>
<h2>How do I use the JSTL?</h2>
<jsp:useBean id="questions" class="com.apress.faq.Questions"
scope="page">
<jsp:setProperty name="questions" property="topic" value="EL"/>
</jsp:useBean>
<table border="1">


<tr><th>tag</th><th>result</th></tr>

<tr><td><c:out value="${'${'}questions.topic}"/></td>
<td><c:out value="${questions.topic}"/></td>
</tr>

<c:set target="${questions}" property="topic" value="JSTL" />
<tr>
<td><c:set target="${'${'}questions}" property="topic"
value="JSTL"/>
</td>
<td><c:out value="${questions.topic}"/></td>
</tr>

<c:if test="${questions.topic == 'EL'}">
<tr><td>This row will not be created</td>
<td></td>
</tr>
</c:if>
<c:if test="${questions.topic == 'JSTL'}">
<tr><td>This row was created because the c:if tag result was true</td>
<td></td>
</tr>
</c:if>
</table>
<h2>Multiplication table, 1 - 5</h2>
<!-use the forEach tag to create a table -->
<table border="1">
<tr><td></td><td>1</td><td>2</td><td>3</td><td>4</td><td>5</td></tr>
<c:forEach var="i" begin="1" end="5">
<tr><td><c:out value="${i}"/></td>
<c:forEach var="j" begin="1" end="5">
<td><c:out value="${i*j}"/></td>
</c:forEach>
</tr>
</c:forEach>
</table>
<h2>Formatting numbers</h2
<br><fmt:formatNumber value="23.456" type="number" /> results in
<fmt:formatNumber value="23.456" type="number" />
<br><fmt:formatNumber type="currency">23.456
</fmt:formatNumber> results in <fmt:formatNumber
type="currency">23.456</fmt:formatNumber>
<br><fmt:formatNumber value=".23456" type="percent"/> results
in <fmt:formatNumber value=".23456" type="percent"/>
<br><fmt:formatNumber value=".23456" type="percent"
minFractionDigits="2"/> results in <fmt:formatNumber
value=".23456" type="percent" minFractionDigits="2"/>
</body>
</html>Can anyone spot the problem?
Sorry for such a big post!

ava.lang.reflect.InvocationTargetException
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     sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
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Weblogic.servlet.jsp.JspException: (line 1): Error in using tag library uri

Previously my web app was running fine using eclipse 3.1
When I upgraded my eclipse to 3.2 then built the same web app and deployed, upon running the url i got error
weblogic.servlet.jsp.JspException: (line 1): Error in using tag library uri='/tags/css' prefix='css' : cannot find tag class
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Using sjsws to host many small servlet/jsp sites on one server

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