Using struts - jsp design question

Using struts. Have a JSP cust.jsp
In it half of it is very specific to that page only. rest half is shown in this cust.jsp and another report.jsp too.
want to implement this so that code can be re-used in the other one too.
The way I have designed is for a jsp have a prepare action and dispatch action.
But not sure how to design this page so that I can re-use the code in another too.
any suggesions are appreciated.
Thanks.

have a look at frameworks like Struts

Similar Messages

How to "Performing an Action on Multiple Selected Records" using Struts-JSP

Hi all:
How to do "Performing an Action on Multiple Selected Records" through using Struts/JSP solution that is original MVC/UIX customizing example by Jheadstart.
I know how to reason by analogy through tutorial guide on
Model and Control layer of MVC , but for View layer that is torment to me !
have any idea ?
thanks a lot .

Ting Rung,
In the table in the JSP page you add a checkbox like this:
<td class="fixed">
<input type="checkbox" name="multiselect" value="<%=index%>"/>
</td>
This will render a checkbox in each row, with index number of that row as value.
When you submit the page the request contains the multiselect parameter when at least one row has the checkbox checked.
You can get the value of the multiselect parameter by calling sessionData.getRequestParameterValues("multiselect") in your action. The value is a string array containing the index numbers of the rows that have the checkboc checked.
Steven Davelaar,
JHeadstart Team.

Where can find JHeadstart customizing using Struts & JSP

We can found the Tutorial-Customizing JHeadstart Applications , using MVC-Framework and UIX,
but where we can find the tutorial-Customizing on Struts & JSP solution ?

Dear Steven:
As you mentioned in early:
we will make a new version of this tutorial available through the supplement option which will then contains the same customizations as the MVC-UIX one.Whether this new version of Sruts-JSP tutorial is released now ? and whether have any supplement option for Jhs10g have been released ?
thanks a lot !

Problem with html:select or html:options tags using struts,jsp and tomcat

Hi
I'm updating a Struts-Project to a new layout and therefore rework all jsp Sites.
I'm also using a new Folder-Structure and update therefore my struts-config file.
My Problem now is:
Till now, we had a select-field with a code like this:
< html:form action="/timetableAction" method="POST">
< table width="53%" border="0">
< tr>
< td>< html:radio property="dauer" value="semester"
/></ td>
< html:select property="semester" size="1">
< htmlptions name="semesterList" />
</ html:select>
</ html:form>
The problem now is, that whenever I use any <html:xy> tag, the tomcat server I use can not show the page, he shows just the headers of the template, but not the
content.-jsp-File where the form would be in. He stops right in the middle of the html page, when he notices the <html:xy> tags.
And the funny thing is, that he has no problem to show a page when there is a <html:errors> within it? Why could this be? the struts-html.tld File is well included and teh Tomcat Server shows no exceptions.
Waiting for you answers and thanks

Thank you, I already got the answer in another forum

Basic jsp design question

I did this with a servlet and now I'm trying to figure out how to do this with a jsp.
I have a screen that displays data
If there is no data you get a message saying no data
So I think that would be 2 jsps.
If you hit the edit or save button you get a new screen that allows you to input data. If you hit save or cancel you go back to the 'display data' screen. I also need the ability to do next and previous on the display data screen.
I have this done in servlets, I am having trouble figuring out how to design this for servlets. I am figure the following.
1. jsp for display data screen
2. jsp for the display data screen with no data
3. jsp for the add/cancel screen
Ok that is the html part. How do I manage the logic? can I do an 'action=''> and pass this to a javabean? then have the java bean act as a dispatcher with all my logic in it? I can't figure out how I write a class to manage all my logic for the jsps. How do I call the dispatcher class? how do i have the dispatcher class then call a jsp page?

have a look at frameworks like Struts

How to use javascript functions in struts jsp page

hi
iam using struts jsp pages. here iam calling one javascript function. but iam not able to access the form in javascript.
wat i have to give as form name to get the elements of the form.
please reply me soon
it is urgent
vamsi

your form has no name liek this one:
<html:form action="/userRegistration.do" >so you cannot access the elements inside your form?
accessing the elements inside the form will be like this:
document.forms[0].propertyName.value;

Alternative to HTML Frame in struts/jsp

I am using Struts/JSP for my application..
I have 3 panels(3 jsp's) each with a table of information.. each jsp has a summary part to it.. the data & information in the summary is the same across all panels.. Currently I've copy pasted the code for the summary in all 3 jsp's & Actions & ActionForms... I would like to change this to using a 4th panel sort of for the summary information... not sure what would be the best way to do this.. html frames or anything better maybe.. ?
Thanks

did u consider using struts tiles?
http://struts.apache.org/userGuide/dev_tiles.html

BC4J + Struts: Design questions!

OK, I'm wanting to use Struts with BC4J and have a design question for you BC4J users and gurus.
Here's how I think things would work:
1. User requests page
2. Struts ActionServlet calls perform() on Struts ActionForm
3. Struts ActionForm instantiates BC4J AppModule and calls business method
4. BC4J AppModule instantiates necessary BC4J ViewObjects and performs business operations which return data
5. Struts ActionForm receives value objects from BC4J AppModule
6. Struts ActionForm populates Struts FormBean
7. Struts ActionForm forwards to Struts JSP which displays Struts FormBean
I prefixed the components with Struts/BC4J to keep things clear where things belong.
Now, here are my questions:
In step 3, what's the best method of doing this? Do I need to do JNDI lookups every time? What's the performance overhead of this? Anyone have any best-practice code that does this?
Is this the accepted way of doing things? Is there a better way of designing this system?
Thanks!

In Step3 you should use the ApplicationModule pooling framework, especially if you are trying to work in stateful mode because the pooling automatically handle the AM activation/passivation.
There are different way to go at it.
If you are using the BC4J custom tag library and have an ApplicationModule tag in your jsp, the pooling is already initialize. By the time your action is trigger you just need to retrieve the am using the application id:
in your jsp:
<jbo:ApplicationModule id="myAM" ... />
in your Action implementation:
HttpContainer container = HttpContainer.getInstanceFromSession(request.getSession());
SessionCookie cookie = container.getSessionCookie("myAM");
ApplicationModule am = null;
if (cookie != null)
am cookie.useApplicationModule();
This AM id can be passed as URL parameter...
If you do have a JSP with an AM tag you need to create the pool with findSessionCookie call.
For more info about AM pooling look at the end of this thread for Steve resources:
http://forums.oracle.com/forums/message.jsp?id=912431&gid=513211
This is what we are currently doing for to provide support for BC4J in Struts for our next release.
Charles.

Approaches for Prepopulating dropdowns in Jsp using struts.

Hi,
I'm having a functionality working of pre-populating dropdowns using struts like:
ArrayList list = getRoles(); //This method will return list of roles
request.setAttribute("roles", list);
By setting this collection in the request it will be availbel to <html:select and <html:options> tags for pre-populating. My question here is do we need to set the list (that is to be displayed in the JSP) in request scope deliberately, or there are other better approaches as well to do the same, like using expression language and accessing the method directly.
Thanks,
Prashant.

Why dont you use ActionForm.
declare a private variable
//variable
private List roles=null;
//methods
public List getRoles();
public void setRoles(List roles);and in ActionClass
ArrayList list = getRoles(); //This method will return list of roles
form.setRoles(list);This collection object will be available in the jsp forwarded from that action in the scope specified in the struts-config.
then use
<html:select>
<html:options collection="roles" labelProperty="name" property="id" />
</html:select>

How to make a Struts message null after used in JSP?

Hi,
In the context of Struts/JSP,
An action class might write error messages by
ActionError msg = new ActionError("msg.request.something");
ActionErrors msgs = new ActionErrors();
msgs.add(ActionErrors.GLOBAL_ERROR,msg);
saveErrors(request,msgs);
This message will produce a popup modal window by the following JSP code:
<logic:messagesPresent>
<html:messages id="error">

<script>javascript:alert('<%=error%>')</script>
</html:messages>
</logic:messagesPresent>
The problem is that this JSP page is shared by serveral actions: when another action invoke this page again, the previous error message will take effect again.
So my question is how to make message null after used once by its author.
Thx.
PY

msgs = null;

Question of using Struts for the J2EE pattern

I am now using Struts for the development. I have 3 questions about J2EE
pattern by the use of Struts:
1) How can I use Struts to create the Front Controller? In the book
descibing Front Controller, it is a servlet file which receives the request
and then dispatches to the appropriate view according to the request.
However, in using Struts, should I use the same way? However, I found that
in using Struts, I can call the controller class which subclass
ActionServlet, all the views forwarded are declared in the
struts-config.xml. Am I right in this method?
2) In the project, there is a Front Controller which dispatches the request
to the appropriate view (jsp file). Of course, I use Struts to do this.
However, I expect that the user is impossible for going to the view (jsp
page) directly by typing the address of the jsp file. I hope that the user
can go to the view through the controller only. How can I do this?
3) There is a problem by using browser - when a user browses a site, he can
press the 'back' button to the previous page, and then click the 'forward'
button also. How can I prevent this by using Struts? I found that in some
sites, when the user clicks the 'back' button, an error page displays. How
can I do this? Thanks!
Many Thanks!
Stephen

I'll take a stab at number 2 and number 3.......
2) You could have the controller object place a "flag" in the request that is dispatched to the JSP. Make the JSP check for that flag to ensure that this request came from the controller object. If the request comes from anywhere other than the controlle object, you can display an error page, or you could redirect them back to the controller. You could also use the HTTPSessionObject to place flags for users and have the JSP check there.
3) Keep a log of the user's activities in the HTTPSession. Whenever a page is invoked, have it check to see if the user has already been here, and if it is appropriate for the user to be here again.
Hope this helps!!
I'm not really a java programmer, I just play one on TV.

Design questions on using JMX

I have been reading about JMX and trying to understand it
I have some specific design realted questions and wanted some opinions to validate my understanding
Assume a simple j2ee application that exposes 2 webservices .
I would like to find out how many times each service is called and the total number of success/faults/errors
encountered for each service along with params like starttime etc
From what I have understood , I will have to first create a Bean , say "StatsCollector"
and then creae a StatsCollectorMBean interface.
The StatsCollector will provide the methods to set/update the above values and those will also be exposed by the StatsCollectorMBean interface
1) I have trouble understanding how to create and maintain the MBean Resource...
Shouldnt there be always 1 instance of this resource ? ie shouldnt there be only one StatsCollector ?
Most of the examples create a simple class "Hello implements HelloMBean" and that makes it a MBean
but they create Hello hello = new Hello() and then register it with the MBean server
What if we create multiple objects of Hello? Wouldnt that defeat the porpose of the MBean ?
I think that we need to make sure that this resource is always created once only.
Is that correct ?
2) Is it the right practice to separate your MBean and your "managed" resource ?
ie in the above case , should there be a Singleton StatsCollector POJO that stores the Appliction
statistics and another StatsMBean that will be the MBean that will access the POJO ? This makes sure that your Resource does not have
dependency management classes.
3) How does the application update the values in the MBean ?
In the above example , how do you update the success and failure counts in the MBean from the application ?
Can I update the singleton StatsCollector directly or do I have to go through the MBean Server to update
any value in the MBean ?
If I update them directly , will they be "visible" thru the MBean server ?
4) Assuming that the above app gets deployed in a appserver like WebSphere and in a Clustered environment ,
how to ensure that statisitcs are collected for all the services on all servers cummulativly ?
Is this something that the appserver should provide ? Do we register the MBean with the Appserver
MBean server ?
Any ideas/suggestions will be helpful !
thanks
Pat

Hello pat,
very interesting questions. You are covering the main JMX design questions there.
You should have a look (if you not already did) to the JMX best practices : http://java.sun.com/javase/technologies/core/mntr-mgmt/javamanagement/best-practices.jsp
This document summarize common JMX design patterns.
Answers to your questions:
1) The resources you want to manage/monitor are Web Services. The life cycle of these services is handled by the J2EE container itself. As you say, the tricky part is to link the WebService resource life cycle to the MBean resource
The MBean leaves inside its own container, the MBeanServer.
You should identify an initialization phase in which you create your MBeans and register them inside the MBeanServer once.
In your case, you can go for a single collector that monitors the 2 Web Services or a collector per Web Service. It seems that you want to track each service independently. Having 2 MBeans should offer a more flexible solution.
If you go for 1 MBean, you should name it "<your management domain>:type=StatsCollector". This name identify an MBean for which you have a single instance. Once the collector registered with this name, the MBeanServer will guarantee that no MBean with the same name can be registered.
If you go for 2 MBeans, you should add the Web Service name to each MBean ObjectName. For example:
MBean 1 : "<your management domain>:type=StatsCollector,name=MyWebService1"
MBean 2 : "<your management domain>:type=StatsCollector,name=MyWebService2"
Example of MBean creation and registration code :
StatsCollector collector1 = new StatsCollector();
ManagementFactory.getPlatformMBeanServer().registerMBean(collector1,
new ObjectName("com.foo.bar:type=StatsCollector,name=WebService1");
At this point you have an MBean registered inside the platform MBeanServer.
2) A Standard MBean is formed of a java interface and a class. Generally the interface and the class are not separated. They could be but I don't see a strong reason in your case to have the POJO and interface not being the same object.
3) You shouldn't expose the methods to set the values in your MBean interface. Only getters should be visible. It means that you will have to keep a direct reference to the collectors to update the statistics. During your initialization phase, you could use JNDI to register the collector instances. The WebServices will then use JNDI to retrieve the collectors.
An example of a simplified StatsCollector class and StatsCollectorMBean interface
public interface StatsCollectorMBean {
public int getNumRequests();
public class StatsCollector implements StatsCollectorMBean {
private int numRequests.
public int getNumRequests() {
return average;
public serviceCalled() {
numRequests++;
In the above example, serviceCalled is not part of the management interface and is called by the Web Service.
4) Difficult question for which I can't provide you with a reply. JMX doesn't offer such cumulative service in a standard way. In some appserver (glassfish for instance), MBeans are cascaded inside the domain server. There is no cumulative representation offered, but you could implement your own by defining new MBeans linked to the StatsCollector ones.
To conclude, Appservers are offering some "out of the box" management and monitoring features . For example glassfish relies on the AMX framework (that is JMX based) . AMX (https://glassfish.dev.java.net/javaee5/amx/) allows you to monitor and manage your services. A possible solution would be to rely on this infrastructure to build your own management and monitoring.
Hope this help.
Regards.
Jean-Francois Denise

How to assign bean value to a local variable in JSP using struts.

Hi everybody!
I've a problem that puzzled me on how to assign a bean value to a local variable like String in JSP using struts.
we can have someting like this to display the value
<bean:write name="detailService" property="status" />or
<bean:define id="theStatus" name="detailService" property="status"/>
This is country: <%=theStatus%>but an error occured when I tried like this:
String currentStatus = "<bean:define id="theStatus" name="detailService" property="status"/>";
or
String currentStatus = "<bean:write name="detailService" property="status" />";Is there a way to do this?.....
Any help pretty much appreciated

Java != JSP.
The <bean:define> and <bean:write> tags are custom tags meant to appear in the HTML section of a JSP file, as opposed to the scriptlet section. They actually get turned into java code as part of the translation process.
The <bean:write> tag naturally just writes out what you tell it to.
The <bean:define> tag defines a local variable, and gives it a value.
this should do it.
<bean:define id="theStatus" name="detailService" property="status" type="java.lang.String"/>
<%
String currentStatus = theStatus;
%>With the advent of JSTL, you shouldn't really need to use scriptlet code anymore. Personally I am for 0% scriptlet code in any jsp I write.

How to use VPD in Java/Struts JSP portlet with SSO

DB = 10.1.0 (Standard Edition)
Portal = 9.0.4.1
10gAS = 9.4.0.1 (EE)
I am in the beginning stages of developing some portlets that will be Java/Struts JSP based. We use SSO and have implemented some VPD security in our DB by creating some views that use SYS_CONTEXT('USERENV','CURRENT_USERID').
These Java portlets connect to the DB using a defined JDBC connection for the OC4J container they are deployed in. The problem I'm having is that the call to SYS_CONTEXT is returning the user of the JDBC connection and not the SSO user. So far I have been unable to find any documentation that will point me in the right direction to get this configured properly.
Deployment and configuration are as follows. Deploy war file to custom container on app server. In the configuration of the OC4J contain the app used the containers default JDBC connection using the oracle.jdbc.pool.OracleDataSource class. Max and Min open connections are blank.
In the portal configuration under Navigator - Providers tab we defined a new Registered Provider. In the Connections tab for the provider we Specify the URL Http://hpsrv02.simsol.com:7777/discovery-portlets/providers. Under "Specify how the user's identity will be set by the Portal..." the "The user has the same identity in the Web providers application as in the Single Sign-On identity" is selected. Under "User/Session Information" User is selected and Login Frequency is set to "Once per user session". Then we created a new portal page and created a new portlet with the new provider.
Just an FYI I do have Discoverer working with VPD and any report portlet, dynamic page portlet and any other type of portlet I created all work correctly with VPD it is just the java/struts one that is not working.
So does any one have any insight into what configuration steps I have missed?
Any help is much appreciated,
Ed Klinger

Ed,
Your java code must get the SSO username (it's just a HTTP header variable) :
ie: code sample...
Enumeration e = request.getHeaderNames();
while (e.hasMoreElements()) {
String name = (String)e.nextElement();
String value = request.getHeader(name);
out.println("<br> "+name + " = " + value);
if (name.toUpperCase().trim().equals("OSSO-USER-DN")){
dn_user=value;
out.println("<br>******** USER DN = "+dn_user);
Then, the SSO username can be used in the VPD policy.
Note that there is a difference between the sso username and the database username . SSO username is not known by database (CURRENT_USERID will return a database username)
Discoverer worked OK in your case with the SYS_CONTEXT (.. CURRENT_USERID) because authentication is made by database user, probably.

Multi forms from different action in one jsp using struts?

In user home page i am using 3 tabs in that 1 tab is for personal , 2 tab is for resume details etc.. but i crated for personal form1 and resumes for form2. when i click in the resume tab i have to show resumes list using same jsp. when click that tab it is showing Null pointer exception. How to solve please help.......

Read the stacktrace. The 1st line points to the class/method/linenumber where this exception is caused. Lookup this line in your code and fix it accordingly. I.e. either make sure that the object reference in question is NOT null when it is been accessed/invoked, or add a nullcheck on this object reference (e.g. if (object != null) { object.doSomething();} ) so that you can skip the action when it is null.

Using struts - jsp design question

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