RE: Scalability
The only thing I would add to your argument is the fact that Struts relies fairly heavily on Reflection to set attributes on beans. Since Reflection incurs a much higher overhead than a straight method call (although I have heard that JDK 1.4 improves this performance considerably) - I did a rough test and found that this could be as much as three times as long - it could become a scalability issue as well... -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Thursday, August 09, 2001 7:46 AM To: [EMAIL PROTECTED] Subject: RE: Scalability but I'm getting feedback from other developers that don't feel that Struts is a very scaleable framework. What exactly are they saying? I don't have any personal experience in this area but it seems to me that Struts is a rather thin layer on top of normal Java Servlets. All it really changes is that two pages (Model and View) are called instead of the usual one. The other features don't seem like the kind of things that would affect scaleability. So any criticism of Struts should probably be generalizable (if that's a word ;-) to Servlets if it's got any validity. Please send more details. Devon
RE: unsubscribe !!!!!!!!!!!!!!!!!!!!!!
unsubscribe -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Siping Liu Sent: Tuesday, August 07, 2001 10:05 AM To: [EMAIL PROTECTED] Subject: unsubscribe !! please unsubscribe me
RE: save dynamic jsp content
This will get you an input stream containing the content for the resource.
try {
Url url = new Url(PATH_TO_RESOURCE_HERE);
InputStream is = url.openStream();
// use input stream to get content to pass through SMTP session
} catch (MalformedURLException ignored) {
} catch (IOException ignored) {
} finally {
try {
is.close();
}
catch (IOException ignored) {
}
}
-Original Message-
From: Calvin Yu [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, August 01, 2001 11:07 AM
To: [EMAIL PROTECTED]
Subject: Re: save dynamic jsp content
The easiest way would be to write a client that makes a HTTP request to
the server and captures the HTML output that way.
Calvin
On 01 Aug 2001 13:40:58 -0400, Mustapha Essalihe wrote:
Hi,
I am new to struts. In my action class (perform) I want to run a jsp
page
in background and save its content in an html file. How Can i do that
in
perfom method ?. After that i know how i will send this html file by
e-mail
(usinj java smtp) and forward the user to an adequate location
(success).
Thanks in adavance.
Mustapha Essalihe
Reflection vs. Direct Method Call
Hello All, Just a general performance question Does anyone know the performance difference between a direct method call and introspection like Struts uses? I would be interested in hearing the differences for different Java implementations (I have heard that JDK 1.4 will be making huge improvements in this area) because I have heard that there can be significant differences. The application I am considering using Struts with would require large amounts of numerical data to be posted through the introspection and therefore if introspection performance is a problem I would have to choose another framework or roll my own. Thanks for any help, Kevin -Original Message- From: Andreas Amundin [mailto:[EMAIL PROTECTED]] Sent: Thursday, July 26, 2001 2:50 PM To: '[EMAIL PROTECTED]' Subject: RE: Use of form beans - design issue... First let me preface with the fact that I have been dabbling with struts for about 6 weeks, so please take what I say with a grain of salt. And anyone else out there please correct me if I am wrong. See my inserted replies below. From: Burleson, Thomas [mailto:[EMAIL PROTECTED]] snip Currently -- as I understand it -- the ActionForm (bean) is populated by the ActionServlet using introspection. And the Bean is then used by the Action (handler) to modify/update the business layer or model data. Then the actionForward is used to indicate which JSP the Servlet should forward/dispatch to. The page (which could be a different JSP page or the same used for the request) then searches for the ActionForm (bean) and creates one if it does not exist in the request scope. This is where my understanding differs. As I understand it the ActionForm is created by the JSP if none exists. As far as I know it is possible to directly load a JSP page with a form without invoking any pre-processing action servlet. So (finally) here is the issue: The controller and handler uses a dumb bean to modify the model (MVC). Cool! But to gather information for use on a JSP, the bean must know how to gather that data from the business layer (model). BAD!! Following your understanding of how things work I completely agree with what you are writing above. However, let me now state that I don't think beans used in a JSP should ever have any dependencies on the model. IMHO beans for use in JSPs should be dumb holders of information. They are the input and output parameters of the JSP. To populate beans for a JSP a pre-processing action servlet should use model classes or EJB entity beans. The action servlet controls how information from the model is propagated to the view. The handler should configure the bean BEFORE dispatching to the JSP. This way, the bean remains dumb and the handler centralizes all knowledge of the business layer. Exactly. Struts seems to use 2 different patterns/approaches: the incoming processing is very different than the processing used during display of the JSP. I would say Struts have an approach for incoming, from the form, processing that automatically populates the form bean with the information from the form. For the processing during the display of a JSP all that happens is that the form bean is created if one cannot be found. The found form bean, newly created or not, is used to populate the default values of the form. I hope this explanation makes sense. Andreas
RE: Missing type on declaration - any poniters 1 error left
You need to close the brace on your class declaration I believe.
Like this:
public class ActionForward {
public perform(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
{
try {
javax.sql.DataSource dataSource =
servlet.findDataSource(null);
java.sql.Connection myConnection =
dataSource.getConnection();
//do what you wish with myConnection
} catch (SQLException sqle) {
getServlet().log(Connection.process, sqle);
} finally {
//enclose this in a finally block to make
//sure the connection is closed
try {
myConnection.close();
} catch (SQLException e) {
getServlet().log(Connection.close, e);
}
}
}
} -- Add this brace here
-Original Message-
From: Calvin Yu [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, July 25, 2001 7:55 PM
To: [EMAIL PROTECTED]
Subject: Re: Missing type on declaration - any poniters 1 error left
I think your compiler can't find the initial class declaration. Chances
are your actual syntax error occured before that line. Make sure you
don't have too many '}' and that you're making a valid class
declaration.
It seems that a lot of your problems has more to do with your
understanding of Java than with Struts. You might want to check out
some general java language message groups, as they might be better at
explaining the problems you are experiencing.
Calvin
On 25 Jul 2001 12:51:08 +0100, Chuck Amadi wrote:
Hi i have got it done to 1 error as below
webapps/bbnpa/WEB-INF/classes/org/apache/struts/action/ActionForward.java
[9:1] 'class' or 'interface' keyword expected.
public ActionForward perform (ActionMapping mapping,
^
1 error
Errors compiling ActionForward.
Chuck Amadi wrote:
Hi, can someone take a peek at my ActionFoward Class
--
---
webapps/bbnpa/WEB-INF/classes/org/apache/struts/action/ActionForward.java
[10:1] Missing type on declaration
public perform(ActionMapping mapping,
^
webapps/bbnpa/WEB-INF/classes/org/apache/struts/action/ActionForward.java
[35:1] Type expected or missing '}'
^
2 errors
Errors compiling ActionForward.
--
---
package classes.org.apache.struts.action;
/*Accessing Relational Databases
*Struts can define the datasources for an application from within its
standard configuration file. A simple JDBC connection pool is also
provided.
*See The Action Mappings Configuration File section and the Utilities
Developer Guide for details.
*After the datasource is defined, here is an example of establishing a
connection from within a Action perform method.*/
public class ActionForward {
public perform(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response){
try {
javax.sql.DataSource dataSource =
servlet.findDataSource(null);
java.sql.Connection myConnection =
dataSource.getConnection();
//do what you wish with myConnection
} catch (SQLException sqle) {
getServlet().log(Connection.process, sqle);
} finally {
//enclose this in a finally block to make
//sure the connection is closed
try {
myConnection.close();
} catch (SQLException e) {
getServlet().log(Connection.close, e);
}
}
}
The path is C:/jakarta-tomcat-3.2.2/webapps/bbnpa/WEB-INF/classes/
do i need to creatE a base dir i.e
C:/jakarta-tomcat-3.2.2/webapps/bbnpa/action/WEB-INF/classes/org/apache/stru
ts/action/ActionForward
Cheers Chuck
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RE: newbie question
What steps did you take to get to that point? What web container are you using? -Original Message-From: Jonathan Yang [mailto:[EMAIL PROTECTED]]Sent: Wednesday, July 25, 2001 8:35 PMTo: strutsSubject: newbie question Hi,all Why can't correctly run the "struts-example"? When I click the url in index.jsp,it throw the a error like following: "The requested URL /struts-example/tour.do;jsessionid=5ox6pc4q91 was not found on this server." why? pls help me, thx. Regards,Jonathan
Concurrency with ActionForms
Does anybody know how Struts handles concurrency when it uses Reflection to update ActionForm attributes? I am assuming that it doesn't but this can be problematic if, in the case of a web application, you have two browser windows - for the same session (this can de done in IE but opening a new browser window from inside a current one) - accessing the same session object concurrently. Just wondering Cheers, Struts Newbie
