Multi-tier Swing Application

Hi,
I'm currently in the planning stages of an application that will use swing, be deployed on a Websphere Application Express V5 server, and access a postgresql database. The application will need to display/add/modify data as well as do complex calculations, validations, etc. All database requests need to be made from the application server rather than the client. I'm having trouble figuring out what approach to take. I'm reading up on Swing, but what do I need to use to handle the data. Ejb's are not supported on our application server. Should I use RMI, servlets, or javabeans or a combination. Is there anything else I should consider. Any help would be appreciated. Thank you.

You seem determined to use Swing.
I am not sure that it is necessarily a good idea. Yes Swing allows you to create a native look and feel, but what else is it giving you? If you want to do a lot of local processing such as a CAD program, then fair enough. But Swing also give you the security risk that people can view and change your Swing code as it will likely be on the client machines. This means you will have to consider how to protect passwords.
A servlet could communicate with Swing but is more usually in communication with a browser. This seems a little more secure. You will be able to design forms similar to the sun forum and display data. Also because the code is on the server, you can update everyones code easily.
However if this is your first big project, you should buy in some experience, as suggested previously.

Similar Messages

Memory Leak in a multi threaded Swing application (ImageIcon)

When I profile my swing application with netbeans 5.5 , I notice that after each periodically tidy up my image container (add,remove IconImage objects to a hashmap or arraylist), there gather by and by surviving objects. This leads to run out of memory after a while. Is there any other way to avoid this effect?
Any ideas about "The JVM is notorious for caching images."
please help..
what I have made briefly:
1.) Read the binary stream from the db :
rs=stmt.executeQuery(query);
if(rs.next()){
    int len=rs.getInt(2);
    byte [] b=new byte[len];
    InputStream in = rs.getBinaryStream(3);
    try {
            in.read(b);
            in.close();
            img=Toolkit.getDefaultToolkit().createImage(b);
     } catch (IOException e) {
            e.printStackTrace();
stmt.close();
rs.close();2.) hold the icon as field :
this.icon = new ImageIcon(img);3.) After a while I remove the object from my collection and on the
overridden method finalize() I also call the flush() method.
if(this.icon != null){
            this.icon.getImage().flush();
            this.icon = null;
}The surviving objects still increase?! On the page of SUN they
submitted a bug. But this is set on closed/fixed.
(http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4014323)
What am I doing wrong? I also use the byte[] constructor on creating the icon and
my java version is 1.5.0_10.

If in your JFrame u have placed your image, before invoke the dispose()
method put explicitly the image pointer to null and deregister all listener
you have added to any componentI implemented your suggest and after starting a long time test, in one hour there gathered aprox. 500 surviving generations. I attach a snapshot and the java file ( http://www.box.net/public/eqznamrazd ). The used heap size swings between 3MB and 5MB. I guess this wont kill so quickly the application but anyway there is something wrong!
Even properly closed streams, database connections etc.. Really despairing. Could one take a look to the java source?
some snippets bellow:
private class MyImageIcon extends ImageIcon {
        public MyImageIcon(Image img){
            super(img);
        public void removeImage(Image anImage){
            tracker.removeImage(anImage);
private class DetailDialog extends javax.swing.JFrame {
        private String personnr;
        private MyImageIcon icon;
        public DetailDialog(String personnr,MyImageIcon icon){
            this.personnr = personnr;
            this.icon = icon;
        public void dispose() {
            if(icon != null){
                icon.removeImage(icon.getImage());
                icon.getImage().flush();
                icon = null;
            super.dispose();
private class Person extends Object {
        private MyImageIcon icon;
        private String number;
        private DetailDialog detailDialog;
        protected void destroy() {
            if(icon!=null){
                icon.removeImage(icon.getImage());
                icon.getImage().flush();
                icon = null;
            if(detailDialog!=null){
                detailDialog.dispose();
private Image LoadImageFromDB(String personnr){
        Image img = null;
        String filename = personnr + ".jpg";
        Connection con = getMysqlConnection();
        Statement stmt;
        ResultSet rs;
        try {
            stmt = con.createStatement();
            String query = "select * from personImage where image='"+filename+"'";
            rs=stmt.executeQuery(query);
            if(rs.next()){
                int len=rs.getInt(2);
                byte [] b=new byte[len];
                InputStream in = rs.getBinaryStream(3);
                try {
                    in.read(b);
                    in.close();
                    img =
                            java.awt.Toolkit.getDefaultToolkit().createImage(b);
                } catch (IOException e) {
                    e.printStackTrace();
            rs.close();
            rs = null;
            stmt.close();
            stmt = null;
            con.close();
            con = null;
        } catch (SQLException e) {
            e.printStackTrace();
        return img;
public void random(){
        java.sql.ResultSet rs = null;
        java.sql.Statement stmt=null;
        java.sql.Connection con = getSybaseConnection();
        try {
            try {
                stmt = con.createStatement();
                rs = stmt.executeQuery(randomquery);
                while(rs.next()){
                    Person person = new Person();
                    person.number = rs.getString("PersonNr");
                    Image img = LoadImageFromDB(person.number);
                    if(img !=null){
                        MyImageIcon ico = new MyImageIcon(img);
                        person.icon = ico;
                    person.detailDialog = new
                            DetailDialog(person.number,person.icon);
                    personList.add(person);
                    System.out.println("Container size: " +
                            personList.size());
                    counter++;
                if(counter%20 == 0){
                    for(Person p : personList){
                        p.destroy();
                    personList.clear();
                    System.gc();//no need, but I force for this example
                    System.out.println("Container cleared, size: " +
                            personList.size());
            } catch (SQLException ex) {
                ex.printStackTrace();
            }finally{
                if(rs != null){
                    rs.close();
                }if(stmt != null){
                    stmt.close();
                }if(con != null){
                    con.close();
        } catch (SQLException ex) {
            ex.printStackTrace();
    }

Multi tier debugging VS2008 - ODAC 1110620

Hi,
I'm trying to get the multi-tier debugging working in the above environment and am hitting the 'ORA-30683: failure establishing connection to debugger' exception.
I can debug by right click on the server explorer and doing step-into.
I have Tools - Oracle Application Debugging checked.
In Tools -> Options ->Oracle Developer Tools i have the connection checked and the port range 49152 - 65535. No firewall is running.
Any ideas what's causing this?

Hi, a few questions:
1. Does your debugger machine use IVP6 address? How about the database?
2. Does the debugger machine have multiple IP addresses to use?

Multi-tier ssl

Here is quick question for you weblogic Guru's :P
I have a multi tier setup with 3 web servers and 3 app servers
My web servers are apache running the weblogic proxy plugin.
Now.. As far as i can tell my web servers (apache) are handling all the SSL information,
and in my apache cluster configuration my 443 ports point to my 4701 (non SSL
weblogic port). I currently have SSL turned on in WeblogicCommerceServer3.1 and
i am wondering. Do i really need it turned on? as far as i can tell, Weblogic
starts up a SSL ThreadPool at startup and i dont think it is being used..
Please Give me whatever feedback you guys may have?
i just want to understand what exaclty is going on and how it interferes with
my servers/application..
thanks everyone
Quintin...

Hey Quintin
my two pennies:
If you're totally sure that your Apache server is handling all SSL connection and WebLogic
is just doing normal, cleartext HTTP on the backend, then you are right.
There is no reason for you to have https enabled on WebLogic with your configuration. If
you're concerned about the SSLThread pool, I recommend disabling https. It should not
interfere with anything in your server or application, to my knowledge.
Hit the admin console, click "servers->myserver" and then on the right look for the SSL tag
and disable it. Restart your server. The SSL port (4701) should now be free (not used) and
the SSLThreadPool should not exist within the VM, as far as I know.
If you ever decide to make the traffic between Apache and WebLogic SSL, then just make sure
you're using the plug-in from at least WLS 6.0sp2-- prior to that you can't do SSL between
Apache and WebLogic.
Then check out http://edocs.beasys.com/wls/docs61/adminguide/plugin_params.html#1143055 for
the details.
Hope this helps.
Joe Jerry
Quintin wrote:
Here is quick question for you weblogic Guru's :P
I have a multi tier setup with 3 web servers and 3 app servers
My web servers are apache running the weblogic proxy plugin.
Now.. As far as i can tell my web servers (apache) are handling all the SSL information,
and in my apache cluster configuration my 443 ports point to my 4701 (non SSL
weblogic port). I currently have SSL turned on in WeblogicCommerceServer3.1 and
i am wondering. Do i really need it turned on? as far as i can tell, Weblogic
starts up a SSL ThreadPool at startup and i dont think it is being used..
Please Give me whatever feedback you guys may have?
i just want to understand what exaclty is going on and how it interferes with
my servers/application..
thanks everyone
Quintin...

Single-Tier in Dev / Multi-Tier in Prod - BPC5.1 - are there any issues?

Background: We are a new install of SAP BPC 5.1 and initially planned to have both Dev and Prod as a single tier install. In the Blueprint design review, the recommendation was made and accepted to have production as a Multi-Tier landscape. Due to tight timelines, the customer will go-live on the Production Multi-tier landscape and Dev in a Single Tier configuration. As soon as possible, we will move Dev to a Multi-Tier install as well to synchronise Dev to Prod.
Question: Other than being uncommon, is there any know issues with having this current dissimilar landscape?
Edited by: Penelope Thomson on Dec 17, 2007 12:15 PM

There's nothing uncommon about having a development environment that isn't an exact macth to production. Many clients that have large mutli-server configurations don't invest that much money and resources in thier development environment. The downside is that when you do things such as stress testing, user acceptance testing and other configurations in development, you really have to do them again in production if you want a fully tested environement.
Also, if you have different software components (e.g. 64bit OS in production and 32bit in development) you are dealing with different service packs and other components that can have different issues. I've also run into differences in authentication issues between a simple and more complex environment depending on how the components are arranged.
These should all be issues the technical consultant that is doing the server configurations can discuss with you. The bottom line is you'll want to make sure you have the production environment setup with enough time to do a through testing before go-live. As far as moving the application from development to production, going from a single server to mutli-server shouldn't be an issues as long as you're using server mananger to do the backup and restore.

Design Patterns for java swing application front a J2EE server

Hi,
i dont nkow that i stay in the correct forum. I am development a java swing client application, no web, and i dont know that if there are any patterns for a client of this type.
I have readed http://java.sun.com/blueprints/corej2eepatterns/Patterns/index.html
but after of Buissnes Delegate pattern, the others one, over ejb tier, are applicated only for web clients, using servlets and jsp pages.
If i have a swing client application, what patterns i must folow for implement the client logic of my swing application??
thanks

MVC pattern is one of the most used
http://en.wikipedia.org/wiki/MVC
http://csis.pace.edu/~bergin/mvc/mvcgui.html
...

Using Basic or Multi-tier configuration for WLS Clusters...

Ok,
          The scenario is: I'm using WLS6.1 (hopefully, version doesn't matter here)
          with three instances clustered. Each instance provides all Services:
          Servlets / JSPs/ EJBs / Database communication... I'm using the Basic
          configuration described on the BEA documentation....
          Now, I want to move forward to a Multi-tier configuration, where the first
          layer will serve Servlets and JSPs and the second layer will serve EJBs.
          The problem: On the first scenario, I was looking EJBs with the Default
          InitialContext() constructor without the environment, since everybody was on
          the same JVM...
          What do I have to do, so my Servlets start looking for EJBs on the second
          cluster now? Do I have to re-write every single lookup? Can I use a
          jndi.properties file on the first layer - on the presentation tier?
          Thanks in Advance,
          Marcelo.


          Thanks Patrick!
          But my actual problem starts here. The Servlets aren't mine. We have to support
          applications which run atop our product(which is a bunch of beans+RMI Objects
          running on the top of WLS) in a backward compatible way with a standalone.
          Will try and make a post if I can find a 'configurable' way out.
          Harish
          Robert Patrick <[email protected]> wrote:
          >Put the other server's PROVIDER_URL in a system property, property file,
          >whatever and
          >have the servlets explicitly use it when creating the InitialContext
          >to talk with the
          >other server...
          >
          >Harish Vajha wrote:
          >
          >> Hi Cameron,
          >>
          >> A -Djava.naming.provider.url nor jndi.properties would work. The problem
          >is like
          >> this:
          >> Say I have two WL servers hosting just EJBs: E1, E2. And I have a single
          >WL Server
          >> hosting just servlets: S1. Now I give the -Djava.naming.provider.url=E1(using
          >> http or t3) (or I provide the same thing using my own jndi.properties).
          >>
          >> The problem with this setup is that while starting up, the Server will
          >try binding
          >> every object(including the System bindings like wl.transaction.TransactionManager,
          >> wl.common.T3Services) to the other NS (in this case E1's naming service)
          >which
          >> is bound to fail, as they're already bound in that Server.
          >>
          >> The solution has to be a way to specify the java.naming.provider.url
          >only for
          >> the servlets (or the web app).
          >>
          >> Any ideas on how to provide a Webapp specific lookup address?
          >>
          >> Marcelo, if you've found a way out to separate, pl. make a post.. Thanks!
          >>
          >> Harish
          >>
          >> "Cameron Purdy" <[email protected]> wrote:
          >> >Hi Marcelo,
          >> >
          >> >With Weblogic, your performance will typically decrease if you go
          >the
          >> >route
          >> >that you are describing.
          >> >
          >> >Yes, you can do jndi.properties, however I believe you will find it
          >inside
          >> >one of the WL jars.
          >> >
          >> >Note that you can use java -D instead to define some of the JNDI properties
          >> >to point to the other cluster, but I can't remember them off-hand.
          >> >
          >> >Peace,
          >> >
          >> >--
          >> >Cameron Purdy
          >> >Tangosol Inc.
          >> ><< Tangosol Server: How Weblogic applications are customized >>
          >> ><< Download now from http://www.tangosol.com/download.jsp >>
          >> >
          >> >
          >> >"Marcelo Caldas" <[email protected]> wrote in message
          >> >news:[email protected]...
          >> >> Ok,
          >> >> The scenario is: I'm using WLS6.1 (hopefully, version doesn't matter
          >> >here)
          >> >> with three instances clustered. Each instance provides all Services:
          >> >> Servlets / JSPs/ EJBs / Database communication... I'm using the
          >Basic
          >> >> configuration described on the BEA documentation....
          >> >>
          >> >> Now, I want to move forward to a Multi-tier configuration, where
          >the
          >> >first
          >> >> layer will serve Servlets and JSPs and the second layer will serve
          >> >EJBs.
          >> >>
          >> >> The problem: On the first scenario, I was looking EJBs with the
          >Default
          >> >> InitialContext() constructor without the environment, since everybody
          >> >was
          >> >on
          >> >> the same JVM...
          >> >> What do I have to do, so my Servlets start looking for EJBs on the
          >> >second
          >> >> cluster now? Do I have to re-write every single lookup? Can I use
          >a
          >> >> jndi.properties file on the first layer - on the presentation tier?
          >> >>
          >> >> Thanks in Advance,
          >> >> Marcelo.
          >> >>
          >> >>
          >> >
          >> >
          >

Multi tier to single tier

Hi,
I am planning to clone from a multi tier( db+car==>1 and web+forms==>2 ) to single tier.
Which application folders (appl_top,comn_top etc) should I copy?
Shall I copy both or only one will do?

Hi;
What is your EBS and OS?
Please check clone docs:
Cloning Oracle Applications Release 12 with Rapid Clone [ID 406982.1]
Cloning Oracle Applications Release 11i with Rapid Clone [ID 230672.1]
Also see:
FAQ: Cloning Oracle Applications Release 11i http://ID 216664.1
Troubleshooting RapidClone issues with Oracle Applications R12 [ID 603104.1]
Regard
Helios

Servlets in Multi tier Architecture

Hi
We plan to use a three tier architecture with
Client --- Applet (JDK 1.2)
Middle tier -- WebServer and servlets
Database Server -- Oracle 8i
Our application should have data entry for several (5 - 12 ) tabs each consisting of around 15 fields . A few Jtables will also be used .
Arounf 5 to 10 validations or queries are required to be done with the database in the applet. Around 300 entries will be made by 12 different users in a day.
Is it advisable to use the above architecture ?
Is it required to use Enterprise JavaBeans ?
Will the use of servlets bring down the validations ?
Overall is our architecture feasible for the requirement ?
We will be greatfull to your suggestions
Please mail to the folowing id also
[email protected]
N.Suresh
null

<joemessina> wrote in message news:202463294@jserv5...
Scenario
I am currently using a combined-tier architecture (Servlets & EJB in same WLS instance) on a WLS Cluster.
I would like to keep to option of going to a multi-tier architecture (Servlets & EJB in different WLS instances) on a WLS Clusteropen without having to change application code.
Questions
1. If I code & deploy my EJB?s with remote interfaces only, will WLS automatically make local method calls to my co-located EJB?swithout me having to set up the local interfaces?
It depends on version of weblogic. 5.1, 6.5 and 7.0 did it automatically.
8.1 requires to set it in weblogic-specific bean's descriptor (weblogic-ejb-jar.xml).
2. If so, is there any reason to ever code & deploy local interfaces other than for entity beans?No, there is no such reason.
3. Is there a standard practice regarding the coding & deployment of local & remote interfaces for combined-tier & multi-tierarchitectures?
Sure. Don't use local interfaces except when defining CMR relationships.
I know this all sounds very affirmative, but that fact is that by the time
local interfaces arrived, all J2EE vendors with weblogic pioneering already
provided implicit and explicit colocation optimization, that was the main
Local's promise... So, Local's use is limited to defining CMR.
Regards,
Slava Imeshev

Multi-Tier

Dear OTN Members;
Can you explain me what the multi-tier application concept is?
I need a general information. And Which oracle tools can be
used for this aim?
Thanks...
Fatih Sami KARAKAS
null

user3714906 wrote:
Hi Hussein/Helios
We are using 12.0.6 with 10gR2 RDBMS
This is Single node installation on server proddb
Now I want to move the application tier to another server prodapps
Please suggest me the doc id Follow the steps in (Cloning Oracle Applications Release 12 with Rapid Clone [ID 406982.1]) under "Section 2: Cloning Tasks" for the application tier node only.
- Run preclone on the source node
- Copy/Move the files to the target node
- Run postclone
Once you are done, clean FND_NODES table as per (How to Clean Nonexistent Nodes or IP Addresses From FND_NODES [ID 260887.1]).
Thanks,
Hussein

SAP BPC 5.1 multi-tier installation

We are implementing SAP BPC 5.1 as a multi-tier installation with 2 Windows servers.
Server 1 - SQL Server 2000 Database , OLAP & Reporting Services
Server 2 - Web / Application & Fileshare
Are there any issues that i need to be aware of with a multi-tier install ?
Service-level accounts for BPC - Do these accounts need to be the same between DEV and Prod. The install giude do not seem to indicate that these accounts have to be the same, however I just want to confirm
We did a trial installation and I get the following error :
Job name : http://wdsectest01vm/osoft/Launch.aspx
Detail : Unable to generate a temporary class (result=1). -- error CS2001: Source file C:Tempa71qdytz.0.cs could not be found -- error CS2008: No inputs specified --
Any help will be greatly appreciated
Thanks
Subha

Hello Subha,
You can test the PTR dns records using nslookup.
I will use db.example.com and app.example.com as the fully qualified domain names below.
Open a command prompt (Start -> Run and type cmd) and type the following
nslookup
app.example.com
note - this should return the ip address of the application server and represents
the host (A) record in DNS. Lets assume it returns an ip of 1.1.1.10
set type=PTR
1.1.1.10
note - this will return the reverse lookup (PTR) record for the ip address and
in this example should resolve to app.example.com
exit
After you complete the nslookup for the appserver do the same for the database servers fqdn (db.example.com).
You should perform this test on each tier. If you run into any inconsistencies then your network/DNS administrator should be able to assist you in getting the appropriate records created.

Is there free java chat, which i can embed in my Swing application

Hello all,
I have a Swing application and i want to embed java chat into it.
Can you recommend me free chat for which i can see and modofy client and server sources.
Regards,
Chavdar

No.

How to give Common Background color for all JPanels in My Swing application

Hi All,
I am developing a swing application using The Swing Application Framework(SAF)(JSR 296). I this application i have multiple JPanel's embedded in a JTabbedPane. In this way i have three JTabbedPane embedded in a JFrame.
Now is there any way to set a common background color for the all the JPanel's available in the application??
I have tried using UIManager.put("Panel.background",new Color.PINK);. But it did not work.
Also let me know if SAF has some inbuilt method or way to do this.
Your inputs are valuable.
Thanks in Advance,
Nishanth.C

It is not the fault of NetBeans' GUI builder, JPanels are opaque by default, I mean whether you use Netbeans or not.Thank you!
I stand corrected (which is short for +"I jumped red-eyed on my feet and rushed to create an SSCCE to demonstrate that JPanels are... mmm... oh well, they are opaque by default... ;-[]"+)
NetBeans's definitely innocent then, and indeed using it would be an advantage (ctrl-click all JPanels in a form and edit the common opaque property to false) over manually coding
To handle this it would be better idea to make a subclass of JPanel and override isOpaque() to return false. Then use this 'Trasparent Panel' for all the panels where ever transparency is required.I beg to differ. From a design standpoint, I'd find it terrible (in the pejorative sense of the word) to design a subclass to inconsistently override a getter whereas the standard API already exposes the property (both get and set) for what it's meant: specify whether the panel is opaque.
Leveraging this subclass would mean changing all lines where a would-be-transparent JPanel is currently instantiated, and instantiate the subclass instead.
If you're editing all such lines anyway, you might as well change the explicit new JPanel() for a call to a factory method createTransparentJPanel(); this latter could, at the programmer's discretion, implement transparency whichever way makes the programmer's life easier (subclass if he pleases, although that makes me shudder, or simply call thePanel.setOpaque(false) before returning the panel). That way the "transparency" code is centralized in a single easy to maintain location.
I had to read the code for that latter's UI classes to find out the keys to use (+Panel.background+, Label.foreground, etc.), as I happened to not find this info in an authoritative document - I see that you seem to know thoses keys, may I ask you where you got them from?
One of best utilities I got from this forum, written by camickr makes getting these keys and their values very easy. You can get it from his blog [(->link)|http://tips4java.wordpress.com/2008/10/09/uimanager-defaults/]
Definitely. I bit a pair of knucles off when discovered it monthes after cumbersomely traversing the BasicL&F code...
Still, it is a matter-of-fact approach (and this time I don't mean that to sound pejorative), that works if you can test the result for a given JDK version and L&F, but doesn't guarantee that these keys are there to stand - an observation, but not a specification.
Thanks TBM for highlighting this blog entry, that's the best keys list device I have found so far, but the questions still holds as to what specifies the keys.
Edited by: jduprez on Feb 15, 2010 10:07 AM

How to get mouse wheel action in my swing application?

Hi
In my mouse, i am having mousewheel to support scrolling.With the help of the wheel, i can scroll the pages in IE browser or any other appliction.
In swing application ,i have scroll bar inside a JFrame.I want to have mousewheel action in my swing application to support scrolling.
any idea ???
Thanks

As far as I know,there is no facility for detecting mouse scrolling wheel in JDK 1.3.
Check it in the later releases of JDK.

I want to implement thems functionality in my swing application

Hi All...
I want to implement the themes object in my swing application,How ,where to start and move that functionality,If anybody use this functionality in your program experience can u share with me.
Than to Advance
ARjun...

Hi Kuldeep Chitrakar
I can do that in web intelligence. dont want that
I am replicating some of the sample report of SQL Servers in BusinessObjects XI R3.1.
One of the SQL Sever's report is of product catalogue type that gives complete information like name, category, description along with the products image etc... for each of the products.
I am trying to replicate the above said SQL Server report in Business objects XI R3.1. I am facing problem in bringing the image in to my BO report. The image resides in a table and its datatype is of varbinary(max). I don't know the exact matching while creating an object in the uiverse designer.
Here is the url link http://errorsbusinessobjectsxir3.blogspot.com/2010/10/business-objects-image-errors.html
Regards
Prasad

Multi-tier Swing Application

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