Greetings!
I have been learning about Struts and decided it was the Right Thing
(tm) to use for web application development.
I am using Struts 0.5 on Tomcat 3.1 on Linux 2.2.17.
The servlet engine and struts are installed and work fine.
Basically, I am writing a test app as a prelude to real development.
I wanted simply to get data from a database, display it in a form and
modify it.
So, I have successfully created an OraclePooledConnection and added it
the the servlet context. I can grab a connection and instantiate a
modeled class from the database in the Action for the form to be
populated. Again, that works fine.
Where I run into difficulties is when I forward to the form to
be populated inside the Action. To illustrate, I have attached my
code and included the exception I am getting.
<!-- $Id: action.xml,v 1.3 2000/11/04 00:23:38 leeb Exp $ -->
<!-- Action Mappings for STRUTS based Virtual Trade Show application-->
<action-mappings>
<!-- Global Forward Declarations -->
<forward name="index" path="/index.jsp"/>
<!-- edit test bean form -->
<action path="/editTestForm"
actionClass="com.piperstudiosinc.vts.EditTestFormAction"
formAttribute="testForm"
formClass="com.piperstudiosinc.vts.TestForm">
<forward name="success" path="/test.jsp"/>
</action>
<!-- save test bean form -->
<action path="/saveTestForm"
actionClass="com.piperstudiosinc.vts.SaveTestFormAction"
formAttribute="testForm"
formClass="com.piperstudiosinc.vts.TestForm"
inputForm="/test.jsp">
<forward name="success" path="/test.jsp"/>
</action>
</action-mappings>
<!--
$Id: index.jsp,v 1.3 2000/11/03 01:14:20 leeb Exp $
-->
<%@ page language="java" %>
<%@ taglib uri="/WEB-INF/struts.tld" prefix="struts" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="struts" %>
<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="struts" %>
<html>
<head>
<title><struts:message key="index.title"/></title>
</head>
<body bgcolor="white">
<struts:ifAttributeMissing name="database" scope="application">
<font color="red">
ERROR: User database not loaded -- check servlet container logs
for error messages.
</font>
<hr>
</struts:ifAttributeMissing>
<struts:ifAttributeMissing name="org.apache.struts.action.MESSAGE"
scope="application">
<font color="red">
ERROR: Application resources not loaded -- check servlet container
logs for error messages.
</font>
</struts:ifAttributeMissing>
<h3><struts:message key="index.heading"/></h3>
<struts:link href="editTestForm.do">BEAN TEST FORM</struts:link>
</body>
</html>
<!--
$Id: test.jsp,v 1.1 2000/11/04 00:25:02 leeb Exp $
-->
<%@ page language="java" %>
<%@ taglib uri="/WEB-INF/struts.tld" prefix="struts" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="struts" %>
<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="struts" %>
<html>
<head>
<title><struts:message key="index.title"/></title>
</head>
<body bgcolor="white">
<h3><struts:message key="index.heading"/></h3>
<struts:errors/>
<struts:form action="saveTestForm.do" name="testForm"
type="com.piperstudiosinc.vts.TestForm"/>
<table border="0" width="100%">
<tr>
<th>
<struts:message key="prompt.first"/>
</th>
<td>
<struts:text property="first" size="16"/>
</td>
</tr>
<tr>
<th>
<struts:message key="prompt.last"/>
</th>
<td>
<struts:password property="last" size="16"/>
</td>
</tr>
<tr>
<td>
<struts:submit>
<struts:message key="button.submit"/>
</struts:submit>
</td>
<td>
<struts:reset>
<struts:message key="button.reset"/>
</struts:reset>
</td>
</tr>
</table>
</struts:form>
</body>
</html>
// $Id: EditTestFormAction.java,v 1.1 2000/11/04 00:25:02 leeb Exp $
package com.piperstudiosinc.vts;
import java.io.*;
import java.util.*;
import java.sql.*;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionBase;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionServlet;
import org.apache.struts.util.ErrorMessages;
import org.apache.struts.util.MessageResources;
import oracle.jdbc.driver.*;
import oracle.jdbc.pool.*;
/**
* Implementation of <strong>Action</strong>
*
*/
public final class EditTestFormAction extends ActionBase {
// --- Public Methods
/**
* Process the specified HTTP request, and create the corresponding HTTP
* response (or forward to another web component that will create it).
* Return an <code>ActionForward</code> instance describing where and how
* control should be forwarded, or <code>null</code> if the response has
* already been completed.
*
* @param servlet The ActionServlet making this request
* @param mapping The ActionMapping used to select this instance
* @param actionForm The optional ActionForm bean for this request (if any)
* @param request The HTTP request we are processing
* @param response The HTTP response we are creating
*
* @exception IOException if an input/output error occurs
* @exception ServletException if a servlet exception occurs
*/
public ActionForward perform(ActionServlet servlet,
ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException {
// Extract attributes we will need
Locale locale = getLocale(request);
MessageResources messages = getResources(servlet);
HttpSession session = request.getSession();
VTSTest vtstest = null;
Connection conn = null;
OraclePooledConnection oraclePool = (OraclePooledConnection)
servlet.getServletContext().getAttribute(VTSConstants.DATABASE_KEY);
// test for the database connection
int id = 0;
try {
conn = oraclePool.getConnection();
}
catch (Exception e) {
servlet.log("Problem getting connection from pool " + e.getMessage());
}
vtstest = new VTSTest(conn, id, servlet);
// Populate the user registration form
if (form == null) {
form = new TestForm();
session.setAttribute(mapping.getFormAttribute(), form);
}
servlet.log(mapping.getFormAttribute());
if (form == null) {
form = new TestForm();
session.setAttribute(mapping.getFormAttribute(), form);
}
TestForm testform = (TestForm) form;
testform.setFirst(vtstest.getFirst());
testform.setLast(vtstest.getLast());
/*
HttpSession session = request.getSession();
session.setAttribute(Constants.USER_KEY, user);
if (servlet.getDebug() >= 1)
servlet.log("LogonAction: User '" + user.getUsername() +
"' logged on in session " + session.getId());
*/
// close the connection
try {
conn.close();
}
catch (Exception e) {
servlet.log("Problem returing connection to pool " + e.getMessage());
}
// Forward control to the specified success URI
return (mapping.findForward("success"));
}
}
// $Id: TestForm.java,v 1.1 2000/11/04 00:25:02 leeb Exp $
package com.piperstudiosinc.vts;
import java.util.Vector;
import org.apache.struts.action.ValidatingActionForm;
/**
* TestForm java bean, for testing struts
*/
public final class TestForm implements ValidatingActionForm {
// --- Instance Variables
/**
* The first name.
*/
private String first= null;
/**
* The last name.
*/
private String last = null;
// --- Properties
/**
* Get the first name.
*/
public String getFirst() {
return (this.first);
}
/**
* Set the first name.
*/
public void setFirst(String first) {
if (first == null)
this.first = "";
else
this.first = first;
}
/**
* Get the last name.
*/
public String getLast() {
return (this.last);
}
/**
* Set the last name.
*/
public void setLast(String last) {
if (last == null)
this.last = "";
else
this.last = last;
}
// --- Public Methods
/**
* Validate the properties of this form bean, and return an array of
* message keys for any errors we encounter.
*/
public String[] validate() {
Vector errors = new Vector();
if ((first == null) || (first.length() < 1))
errors.addElement("error.first.required");
if ((last == null) || (last.length() < 1))
errors.addElement("error.last.required");
String[] results = null;
if (errors.size() > 0) {
results = new String[errors.size()];
for (int i = 0; i < results.length; i++)
results[i] = (String) errors.elementAt(i);
}
return results;
}
}
Internal Servlet Error:
javax.servlet.ServletException: Cannot find bean under name
org.apache.struts.taglib.BEAN
at
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:386)
at
_0002ftest_0002ejsptest_jsp_64._jspService(_0002ftest_0002ejsptest_jsp_64.java:421)
at
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:126)
at
javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.jasper.runtime.JspServlet$JspServletWrapper.service(JspServlet.java:174)
at
org.apache.jasper.runtime.JspServlet.serviceJspFile(JspServlet.java:261)
at
org.apache.jasper.runtime.JspServlet.service(JspServlet.java:369)
at
javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:503)
at
org.apache.tomcat.core.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:163)
at
org.apache.struts.action.ActionServlet.processActionInstance(ActionServlet.java:803)
at
org.apache.struts.action.ActionServlet.process(ActionServlet.java:702)
at
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:314)
at
javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at
javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:503)
at
org.apache.tomcat.core.ContextManager.service(ContextManager.java:559)
at
org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:160)
at
org.apache.tomcat.service.TcpConnectionThread.run(SimpleTcpEndpoint.java:338)
at java.lang.Thread.run(Thread.java:475)
Root cause:
javax.servlet.jsp.JspException: Cannot find bean under name
org.apache.struts.taglib.BEAN
at
org.apache.struts.taglib.BaseFieldTag.doStartTag(BaseFieldTag.java:174)
at
_0002ftest_0002ejsptest_jsp_64._jspService(_0002ftest_0002ejsptest_jsp_64.java:204)
at
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:126)
at
javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.jasper.runtime.JspServlet$JspServletWrapper.service(JspServlet.java:174)
at
org.apache.jasper.runtime.JspServlet.serviceJspFile(JspServlet.java:261)
at
org.apache.jasper.runtime.JspServlet.service(JspServlet.java:369)
at
javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:503)
at
org.apache.tomcat.core.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:163)
at
org.apache.struts.action.ActionServlet.processActionInstance(ActionServlet.java:803)
at
org.apache.struts.action.ActionServlet.process(ActionServlet.java:702)
at
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:314)
at
javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at
javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:503)
at
org.apache.tomcat.core.ContextManager.service(ContextManager.java:559)
at
org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:160)
at
org.apache.tomcat.service.TcpConnectionThread.run(SimpleTcpEndpoint.java:338)
at java.lang.Thread.run(Thread.java:475)
--
Lee "Lefty" Burgess <<!>> Manipulate eternity. Power is a symphony:
Web Application Developer <<!>> elaborate, enormous, essential.
PiperStudiosInc <<!>> Dream the moment with a fiddle in summer
[EMAIL PROTECTED] <<!>> and a knife in winter.
