Simplification of a complex jsp page

Hallo everybody,
I'd like to discuss the following issue here:
There is a huge jsp-file, with many struts logic tags, such that there is some business logic on presentation tier. This one jsp contains a large set of UI controls, which are used differently for a wide range of presentation cases: there are many conditions like [if we have the case 1, then this field is read-only; else if we have the case 2, then this and that fields are read-only] or [if we have not the case 3, then show this control, in the case 3 not] and so on.
Any changes in such jsp are impossible, because it will take a month from anyone to understand where should he put a new stuff. I have to simplify this jsp-page. My idea: to separate all possible presentation cases in such a way, that there is a Struts Action and a corresponding separate jsp page for each case (or one Action for a small group of tightly related cases with separate page for each case). An Action contains a business logic, such that there are (almost) no struts logic tags on a jsp page, which defines rather strict appearance of UI controls. Some controls will be duplicated on different pages for different cases (e.g. each page will have the text field "Description"), but it will be clear, how does it all work in any particular case.
Is it correct, what I propose, or may be there is some kind of a pattern, how to refactor in such situation?
Thanks in advance for your comments!
Andrew

Can you not use jsp includes to split the page down into a number of smaller ones, each focussing on a different task, or create a tag library?
Then you would only need to look at the file / tag that fulfilled the function you wanted to edit.

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http://www.dbazine.com/mishra3.shtml
SELECT LEVEL, EMP_NAME , EMP_ID, MGR_ID
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i think you really should have the result page include your search page contents rather than having the user need to click back as you'll end up with all sorts of nightmares in caching & session object management to be honest. if the search page is complex use javascript to hide contents and let the users expand them when they want to re-search.
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I know your not meant to double post but i was told it would be better if i post this message in here so:
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In the above code a Servlet, a JavaBean, JDBC and everything else is combined into just one class. That is not how it is.
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Place the servlet file in a proper folder structure in the Java source folder.
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/WEB-INF/web.xml
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JavaBean example
com.myapp.beans.Person.java
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public class Person{
private int age;
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Thanks,
nmoog.

Sorry, yeah...
I am actually using the UDDI4J package, and it loads various settings with the
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Hi,
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{color}*
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SuneelGoodatJava wrote:
Hi ,
I am doing messenger kind of program using JSP and tomcat server.
When i type message it is showing in the some div. If some other person request for the same page by giving my IP address and jsp page, he should able to see what i have typed on page so far.
how can i do that one . can any one guide me .
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%

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Hi, hueesin
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[Thu Dec 30 13:27:39 2010] [error] [client 172.16.6.144] [ecid: 1293695859:172.16.48.61:25634:0:8748,0] Directory index forbidden by rule: /dev02/KMCTEST/apps/apps_st/comn/java/classes/
[Thu Dec 30 13:27:40 2010] [error] [client 172.16.6.144] [ecid: 1293695860:172.16.48.61:25328:0:8829,0] Directory index forbidden by rule: /dev02/KMCTEST/apps/apps_st/comn/java/classes/
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172.16.6.144 - - [30/Dec/2010:13:32:51 +0530] "GET /OA_HTML/cabo/images/swan/t.gif HTTP/1.1" 304 0 0 "http://kmctapp2.kmc.com:8005/OA_HTML/RF.jsp?function_id=2014&resp_id=50670&resp_appl_id=7000&security_group_id=0&lang_code=US&params=f7B5hnH8rkFfR.idy0MT1JZrquJxVBy3CVpSV.GpXc0&oas=AuZa28Bnhl7glqYyqXbjsg.." "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727)"
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Error while running a jsp page : "jasper run time error"

hii
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HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
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     org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:346)
     org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:414)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:472)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
     org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:511)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:295)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
Unable to find a javac compiler;
com.sun.tools.javac.Main is not on the classpath.
Perhaps JAVA_HOME does not point to the JDK
     org.apache.tools.ant.taskdefs.compilers.CompilerAdapterFactory.getCompiler(CompilerAdapterFactory.java:106)
     org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:935)
     org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:764)
     org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:382)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:472)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
     org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:511)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:295)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.
Apache Tomcat/5.0.28
The set up in my system (path set up is as follows):
Catalina home: C:\ apache software foundation\Tomcat 5.0
Classpath: %java_home%;C:\j2sdk1.4.2_03\bin;
Javahome: C:\ j2sdk1.4.2_03\jre;
path: C:\ j2sdk1.4.2_03\bin
<there are other variables available in path, along with that I have added the j2sdk1.4.2_03\bin in path".
So if u have any way out for it please let me know.

I think you only need to add: c:\j2sdk1.4.2_01
you have specified jre on the end of your path, it is not the jre that is required, but the jdk.
If you are using startup.bat and shutdown.bat (or .sh on Linux) you can amend the files with a text editor (open the startup.bat in notepad), like so:
@echo off
set JAVA_HOME=c:\j2sdk1.4.2_01
if "%OS%" == "Windows_NT" setlocal
I this will start Tomcat with the correct settings, regardless of your environment settings.

Issue in applying SSL selectively to Login JSP Page--Session getting lost.

Hi,
I am facing some issues with SSL configuration on my web site running on tomcat 5.5. I am using jdk 1.5 and form based authentication with JAAS framework.
The SSL configuration is working perfectly when applied to complete web site, but starts giving problem when applied selectively to some JSP pages. At present I am trying to apply SSL just on the login page.
When the login screen loads up, the URL in the browser has a protocol "*https*", as expected, but it doesn't gets changed to "*http*" once the user has successfully logged in. Why is the automatic change from https to http not ocurring?
Also I want to know which is the default page, tomcat will direct the logged in user to, once successfully authenticated using form based login; Is there any way to change this default page to some other page. It looks like that tomcat automatically directs to index.html , once the user has been successfully authenticated, but I am not so sure. My index.html page is having 4 frames; the source of these frames are different JSP pages, which are not under SSL.
My aim is to apply SSL just on login.jsp so that password doesn't travel in clear text. Once the user is authenticated he should see index.html and the address bar's URL should change it's protocol from https to http.
Please, find below the code in my web.xml
<security-constraint>
<web-resource-collection>
<web-resource-name>CWA Application</web-resource-name>
<url-pattern>/about.jsp</url-pattern>
<url-pattern>/admin_listds.jsp</url-pattern>
<http-method>DELETE</http-method>
<http-method>GET</http-method>
<http-method>POST</http-method>
<http-method>PUT</http-method>
</web-resource-collection>
<auth-constraint>
<role-name>*</role-name>
</auth-constraint>
<user-data-constraint>
<transport-guarantee>NONE</transport-guarantee>
</user-data-constraint>
</security-constraint>
<security-constraint>
<web-resource-collection>
<url-pattern>/*login.jsp*</url-pattern>
<http-method>GET</http-method>
<http-method>POST</http-method>
</web-resource-collection>
<auth-constraint>
<role-name>*</role-name>
</auth-constraint>
<user-data-constraint>
<transport-guarantee>CONFIDENTIAL</transport-guarantee>
</user-data-constraint>
</security-constraint>
<login-config>
<auth-method>FORM</auth-method>
<realm-name>CWA Application</realm-name>
<form-login-config>
<form-login-page>/login.jsp</form-login-page>
<form-error-page>/login.jsp?error=true</form-error-page>
</form-login-config>
</login-config>
<welcome-file-list>
<welcome-file>login.jsp</welcome-file>
</welcome-file-list>
My login. jsp has below code:
<form name="login" method="POST" action='<%= response.encodeURL(*"j_security_check*") %>' >
<tr>
<td width="100%">
<table width="260" border="0" cellspacing="0" cellpadding="1">
<tr>
<td align="left" valign="top" rowspan="4"><img src="images/space.gif" width="15" height="5"></td>
<td align="right" class="login-user" nowrap ><p>User name: </p></td>
<td align="left" valign="top"><input maxLength="64" name="j_username" size="20"></td>
</tr>
<tr>
<td align="right" nowrap class="login-user"><p>Password: </p>
</td>
<td align="left" valign="top">
<input maxLength=\"64\" tabindex="2" type="password" name="j_password" size="20">
</td>
</tr>
</form>
The entries in my server.xml are following:
<Connector port="8080" maxHttpHeaderSize="8192"
maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
enableLookups="false" redirectPort="8443" acceptCount="100"
connectionTimeout="20000" disableUploadTimeout="true" />
<Connector port="8443" protocol="HTTP/1.1" SSLEnabled="true"
maxThreads="150" scheme="https" secure="true"
keystoreFile="${java.home}\lib\security\cacerts" keystorePass="changeit"
clientAuth="false" sslProtocol="TLS" />
I have gone through the http://forums.sun.com/thread.jspa?threadID=197150 and tried implementing it; The filter as explained in the thread does gets called but the session values are still lost.
Please note I am using javascript to go from secure "https" to "http" once the user has successfully logged in The javascript code is as below:
top.location.href="http://localhost:8080/qtv/index.html." ;
If I use response.sendRedirect("http://localhost:8080/qtv/index.html") for going to non-secure mode, the index.html page does not gets loaded properly. (Please note that my index.html is made of *4 frames*, as explained earlier. This is a legacy code and frames can't be removed).
The reason for index.html not getting loaded properly is that the Address bar URL does NOT change its URL and protocol from https (https://localhost:8443/qtv/index.html ) to "*http*" (http://localhost:8080/qtv/index.html) when esponse.sendRedirect() is used ;this is the default behaviour of response.sendRedirect(). And because the protocol in address bar is https, index.html is not able to load the other JSP's in it's frames because of cross-frame-scripting security issues (The other JSP's to be loaded in frames are are NOT secure as discussed earlier).
Please let know if any way out.
Thanks,
Masaai

Hi
try to set the maximum interval between requests
eg:
session.setMaxInactiveInterval(6000);
vis

Pls help me writing logic:iterate tag in jsp page

Hey guys , I am struck in retriving string p1,p2,p3 in the jsp page
Pls have a look ata the code
In DAO class:-
StdprdDAO.java
Public arrayList getPFP()
ArrayList a = new ArrayList();
While(rs.next())
     columnsVO colVO = new columnsVO;
     colVO.setProduct(rset.getString(1));//will store in String colProduct
     colVO.setFamily(rset.getString(2));//will store in String colFamily
colVO.setPrice(rset.getString(3));//will store in String colPrice
a.add(colVO);
return a;
In Action Class:-
ArrayList final = null;
StdprdDAO DAO = new stdprdDAO();
final = DAO.getPFP();
For(int i = 0; final !=null && i<final.size() ; i++)
     columnsVO VO = null;
     VO = (columnsVO)final.get(i);
     String p1 = (String) VO.getProduct();
     String p2 = (String) VO.getFamily();
     String p3 = (String) VO.getPrice();
     Request.setAttribute(p1,p1);
     Request.setAttribute(p2,p2);
     Request.setAttribute(p3,p3);
In JSP PAGE:-
id = columnsVO>
<bean:write name = columnsVO property=final id=p1>
but still I am doubting my above sentences in jsp page ,so pls correct them if possible.
Instead of l;ogic:iterate can I use directly getattribute(p1)? <logic:iterate
Still I m doubting I can not utilize columnsVO file in logic:iterate, I can utilize only formbean file.
So pls help me with this.

May I ask why have you done it?
If it is related to printing of the list then it is of no use.But it IS of use. The objects compEmployees is in scope.
It has the list we want to print out.
With logic:iterate:
<table>
     <tr>
       <th>Number</th>
       <th>Employee</th>
     </tr>
     <logic:iterate name="compEmployees" property="totalEmps" id="emp">
          <tr>
            <td>
              <bean:write name="emp" property="empNo"/>
            </td>
            <td>
              <bean:write name="emp" property="empName"/>
            </td>
          </tr>
     </logic:iterate>
</table>or alternatively with JSTL and c:forEach
<table>
     <tr>
       <th>Number</th>
       <th>Employee</th>
     </tr>
     <c:forEach items="${compEmployees.totalEmps}" var="emp">
          <tr>
            <td>
              <c:out value="${emp.empNo}"/>
            </td>
            <td>
              <c:out value="${emp.empName}"/>
            </td>
          </tr>
     </c:forEach>
</table>Cheers,
evnafets

Simplification of a complex jsp page

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