JAVA Caching in Web Application

Hi friends!!
I am currently working on a web application using Servlets & Jsp. I hav to develop CACHE MANAGEMENT module for it!!!
For this development restriction is i cannot use any External cache package(like JCS, Swarm Cache).
So i hav to use the Cache class which comes with Java Software.(developed by sun)
But i hav not found any such class.
pLz tell me if anybody knows the Java class used in Object Caching!!!

However, when the link is clicked second time then the request is not received by our servlet Impossible mate.. can you show your code. You sure there are no javascript errors ?
Why dont you just remove your object from the session after displaying the data from it and see if your page "automatically" hits the servlet when the link is clicked.
cheers..
S

Similar Messages

Best combination of technologies for Java db-supported web application?

Hi everyone!
I was given the task to develop a Java database-supported web application and am now wondering what combination of technologies would best fit my requirements.
Basically, I am supposed to transform an "Excel-based" application into a Java-based web application that can be run in a browser in our intranet (I know, that's what a web application is supposed to do).
The Excel application consist of an Excel sheet that holds all the data and a VBA form, that shows and lets you edit all the details/fields of a row and lets you navigate through the rows. Furthermore there are certain macros to filter the data table.
Now, to transform the application, all data from Excel will be moved to an Oracle relational database and I want to rebuild the functionality with Java.
Consequently, the Java application is intended to...
- output the table as is in the browser
- easily let you filter the data of the table
- let you create (and save) custom filters
- show detail view of a row
- navigate through the rows of the (filtered) table
- save the data that is entered/edited/deleted in the detail view back to the table in the database
So, what are the best (and easiest to use) tools and technologies to develop such an application?
Currently my reasearch has led me to the following conclusions:
*1.* Architecture: I need a three-tier client-server application, which lead us to using the J2EE platform, right?
*2.* For the persistence layer I somehow have to map the database table to a Java object,
- either doing it completely manually (coding) using JDBC
- or using EJB3 / Java Persistence API / Hibernate to get at least the getters and setters auto-generated, right?
Please, correct me whenever i got something wrong!
Oracle JDeveloper supports the mapping process with a wizard when using EJB3 and JPA
(http://www.oracle.com/technology/obe/obe1013jdev/10131/ejb_and_jpa/master-detail_pagewith_ejb.htm)
Is there something comparable available for Eclipse?
*3.* I'd like to use Java Server Faces for the UI. Besides the reference implementation there are several other implementations with additional components for e.g. displaying tables. There are:
- Apache MyFaces Trinidad (former ADF Faces, although ADF Faces looks different/has different style sheet than Trinidad?)
- NetBeans Visual Web tools (which look quite nice in the tutorial, but require the NetBeans IDE, I guess?! Tutorial: http://www.netbeans.org/kb/60/web/web-jpa.html
*4.* What IDE would you recommend? Should have a WYSIWYG editor for the JSF files and should support me as much as possible as a Java Learner!
- JDeveloper
- Eclipse (+Plugins?)
- NetBeans
- MyEclipse (only if there is a free version out there, I have read about an Eclipse plug-in, but don't know if that was free...)
*5.* Do you know some good and easy-to-understand tutorials covering this problem?
*6.* What other aspects should I think of? Are there certain technologies for the business logic or just normal JavaBeans? What about SessionBeans and ManagedBeans?
Any help, answers, ideas, explanations, comments, recommendations, will be highly appreciated!
Cheers,
Chris

Thanks paulcw, for your quick reply and helpful comments!
The whole thing is getting bigger than I thought...
Actually this is a 1-man-project, that I am supposed to realise for small department during my internship in a big company.
Maybe a more detailed description of the structure may help you to understand what I actually need.
The table of concern, is an overview of certain projects inside the company and read-only, as it is a view on another database uniting data relevant for the department.
Then there is a second table for additional data (specific for the department) for each project. This data has to be entered, modified, deleted with the new application, while the data from the first table is only displayed.
1) In this case, is AJAX / JavaScript still necessarily needed?
2) EJB and Hibernate sound like overkill to me as well, but what would be the alternatives? JDBC, SQL queries and rowSets? And are the first mentioned really so hard to use?
3) Do you have any recommendations on how to solve the multiple access problem (I'm sure, I'm not the only one with this kind of problem...)?
Thanks to everyone in advance!
Chris

Using the Model Facade Pattern in a Java EE 5 Web application

Hi,
Yutaka and I did a Tech tip
http://java.sun.com/mailers/techtips/enterprise/2006/TechTips_Nov06.html#2 on using a model facade pattern in Java EE 5 web-only applications recently. We got some questions about it, and these were some of the questions raised...
Question 1) the first part of the tech tip(it has two articles in it) http://java.sun.com/mailers/techtips/enterprise/2006/TechTips_Nov06.html showed how to access Java Persistence objects directly from a JSF managed bean, is this a good practice?
Question 2) when to use a facade(as mentioned in the second part of tech tip) ?
and maybe
Question 3) why doesn't the platform make this easier and provide the facade for you?
Briefly, I will take a shot at answering these three questions
Answer 1) You can access Java persistence directly from your managed beans, but as your application grows and you start to add more JSF managed beans or other web components(servlets, JSP pages etc) that also directly access Java Persistence objects, you will start to see that you are cutting/pasting similiar code to handle the transactions and to handle the Java Persistence EntityManager and other APIs in many places. So for larger applications, it is a good practice to introduce a model facade to centralize code and encapsulate teh details of the domain model management
Answer 2) IAs mentioned in answer 1, its good to use a model facade when your application starts to grow. For simple cases a spearate model facade class may not be needed and having managed beans do some of the work is a fast way to jumpstart you application development. But a facade can help keep the code clean and easier to maintain as the aplication grows.
Answer 3) First note that both of the articles in the tech tip were about pure web apps(not using any EJBs) and running on the Java EE5 platform. Yes it would be nice if a facility like this was made available for web-only applications(those not using EJBs). But for web-only applications you will need to use a hand-rolled facade as we outlined in the tech tip. The Java EE platform does provide a way to make implementing a facde easier though, and the solution for that is to use a Session Bean. This solution does require that you use ythe EJB container and have a Session Bean facade to access your Java Persistence objects and manage the transactions. The EJB Session Facade can do a lot of the work for you and you dont have to write code to manage the transactions or manage the EntityManager. This solution was not covered in this tech tip article but is covered in the Java BluePrints Solutions Catalog for Perssitence at
https://blueprints.dev.java.net/bpcatalog/ee5/persistence/facade.html in the section "Strategy 2: Using a Session Bean Facade" . Maybe we can cover that in a future tech tip.
Please ask anymore questions about the tech tip topic on this forum and we will try to answer.
hth,
Sean

Hi Sean,
I'm working on an implementation of the Model Facade pattern where you can possibly have many facades designed as services. Each service extends a basic POJO class which I'm calling CRUDService: its short code is provided below for your convenience.
The CRUDService class is meant to generalize CRUD operations regardless of the type of the object being used. So the service can be called as follows, for example:
Job flightAtt = new Job();
SERVICE.create(flightAtt);
Runway r = (Runway) SERVICE.read(Runway.class, 2);
Employee e = (Employee) SERVICE.read(Employee.class, 4);
SERVICE.update(e);
SERVICE.delete(r);SERVICE is a Singleton, the only instance of some service class extending CRUDService. Such a class will always include other methods encapsulating named queries, so the client won't need to know anything about the persistence layer.
Please notice that, in this scenario, DAOs aren't needed anymore as their role is now distributed among CRUDService and its subclasses.
My questions, then:
. Do you see any obvious pitfalls in what I've just described?
. Do you think traditional DAOs should still be used under JPA?
. It seems to me the Model Facade pattern isn't widely used because such a role can be fulfilled by frameworks like Spring... Would you agree?
Thanks so much,
Cristina Belderrain
Sao Paulo, Brazil
public class CRUDService {
    protected static final Logger LOGGER = Logger.
        getLogger(Logger.GLOBAL_LOGGER_NAME);
    protected EntityManager em;
    protected EntityTransaction tx;
    private enum TransactionType { CREATE, UPDATE, DELETE };
    protected CRUDService(String persistenceUnit) {
        em = Persistence.createEntityManagerFactory(persistenceUnit).
            createEntityManager();
        tx = em.getTransaction();
    public boolean create(Object obj) {
        return execTransaction(obj, TransactionType.CREATE);
    public Object read(Class type, Object id) {
        return em.find(type, id);
    public boolean update(Object obj) {
        return execTransaction(obj, TransactionType.UPDATE);
    public boolean delete(Object obj) {
        return execTransaction(obj, TransactionType.DELETE);
    private boolean execTransaction(Object obj, TransactionType txType) {
        try {
            tx.begin();
            if (txType.equals(TransactionType.CREATE))
                em.persist(obj);
            else if (txType.equals(TransactionType.UPDATE))
                em.merge(obj);
            else if (txType.equals(TransactionType.DELETE))
                em.remove(obj);
            tx.commit();
        } finally {
            if (tx.isActive()) {
                LOGGER.severe(txType + " FAILED: ROLLING BACK!");
                tx.rollback();
                return false;
            } else {
                LOGGER.info(txType + " SUCCESSFUL.");
                return true;
}

Passing Parameters via Post Method from Webdynpro Java to a web application

Hello Experts,
I want to pass few parameters from a web dynpro application to an external web application.
In order to achieve this, I am referring to the below thread:
HTTP Post
As mentioned in the thread, I am trying to create an additional Suspend Plug parameter (besides 'Url' of type String) with name 'postParams' and of type Map.
But when I build my DC, I am getting the same error which most of the people in the thread have mentioned:
Controller XXXCompInterfaceView [Suspend]: Outbound plug (of type 'Suspend') 'Suspend' may have at most two parameters: 'Url' of type 'string' and 'postParams' of type 'Map'.
I am using SAP NetWeaver Developer Studio Version: 7.01.00
Kindly suggest if this is the NWDS version issue or is it something else that I am missing out.
Also, if it is the NWDS version issue please let me know the NWDS version that I can use to avoid this error.
Any other suggestion/alternative approach to pass the parameters via POST method from webdynpro java to an external web application apart from the one which is mentioned in the above thread is most welcome.
Thanks & Regards,
Anurag

Hi,
This is purely a java approach, even you can try this for your requirement.
There are two types of http calls synchronous call or Asynchronous call. So you have to choose the way to pass parameters in post method based on the http call.
if it is synchronous means, collect all the values from users/parameters using UI element eg: form and pass all the values via form to the next page is nothing but your web application url.
If it is Asynchronous means, write a http client in java and integrate the same with your custom code and you can find an option for sending parameters in post method.
here you go and find the way to implement Asynchronous scenario,
http://www.theserverside.com/news/1365153/HttpClient-and-FileUpload
http://download.oracle.com/javase/tutorial/networking/urls/readingWriting.html
http://digiassn.blogspot.com/2008/10/java-simple-httpurlconnection-example.html
Thanks & Regards
Rajesh A

Java Printing in web application

hi All,
Hi All,
we are developing a web application using struts,in one of the page the leave reports of the employee is displayed , the client requirement is the client should be able to print the displayed document, using javascript i can print the document but i wanted to use a separate applet to print the report document, so when i click a button named print in the report page a new applet should open containing the report page and i should be able to print from that applet.
Any help on this regard is highly appreciated
Thanks & Regards,
Sasikumar Sugumar

hai dude,
hope every thing going fine .
Even i'am developing an web application in which i used to print the generated reports. i tried a lot but the struck up with some error.
i'am even able to open the print dialog box.
u have written that u are able to print a PDF doc using the java script.
If u don't mind, can u send me the code to print a PDF.
Thanks in advance

Java + Frameworks + Extendable Web Applications

Hi all
I was taking a look to:
http://java.sun.com/developer/technicalArticles/javase/extensible/
Because I have to do a very extensible web application that a lot of different customers will use.
The main goal is to build a core system that will support a lot of modules around this core.
I want to let my developers plug and unplug (install/uninstall) modules on the fly, maybe with a web interface to let the system cut any connections to the application.
One of the requeriments is to let developers update one customer modules while the application is running. Of course the others customers should notice nothing or almost nothing.
I mean, I want to do almost the same thing that tomcat does with the .war files but inside a already deployed application.
Can someone point me in the right direction?
I want to use the Spring framework, tomcat and Hibernate.
Can remoting help here?

But my question is: How to implement a different
LogManager for each container application.To quote the very first words of the API documentation for LogManager: "There is a single global LogManager object..."
How can I have several instances of the LogManager in
the same VM?Obviously you can't.
Now go back to your real problem (which is, I think, that you want each context path to have separate logs) and see what the API documentation can do for you. The very first words of the documentation for Logger are "A Logger object is used to log messages for a specific system or application component." So I would suggest you need to implement a different Logger for each container application.
PC²

Java Problem with Web Application

Hi Experts
I have a new poblem of connexion with my tools ( Web A
In fact when I execute my template, I have this error of communication:
ERROR JAVA : INCOMING CALL IS NOT AUTORIZED
I do a lot of thing like :
Create RFC Destination in J2EE Engine.
Create RFC Destination for the Portal.
Maintain Portal Server Settings for the Portal
Maintain Single Sign-On in the BI System
Export BI Certificate to the BI System.
Import BW Certificate to the Portal.
Create BI System in the Portal.
Configure User Management in the Portal
Export Portal Certificate to the Portal
Importing the Portal Certificate to the J2EE Engine
Import Portal Certificate to BI System
Set up Repository Manager for BI Documents and BI Metadata
Maintain User Assignment in the Portal.
Import SAP Basis Plug-In to BI System.
Thanks

Let's take this one step at a time.
1. You have successfully configured ABAP/Java communication using template installer? See note 917590.
2. Did you assign the portal user appropriate portal roles?
3. Can you start a web query from 7.0 query designer?

Help please! Java application and web application...

Hi,
I have a problem with inserting a java application (Main.java) in a web application(index.jsp).
I found a source demo of a drag and drop application on the Internet, but now I want to
have the drag and drop application work in a Jpanel/JFrame in a webapplication.
The drag and drop application code:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
public class Main {
    public static void main(final String[] args) {
        final ButtonGroup grp = new ButtonGroup();
        final JPanel palette = new JPanel(new FlowLayout(FlowLayout.LEFT));
        palette.setBorder(BorderFactory.createTitledBorder("Palette"));
        final MainPanel mainPanel = new MainPanel();
        mainPanel.setPalette(palette);
        for(int j=0; j<4; j++){
            final JToggleButton btn = new JToggleButton("Panel "+(j+1));
            palette.add(btn);
            grp.add(btn);
            btn.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                    mainPanel.setAdding(btn.getText());
        final JFrame f = new JFrame("Drag and drop panels");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(palette, BorderLayout.WEST);
        f.getContentPane().add(mainPanel, BorderLayout.CENTER);
        f.setSize(800, 600);
        f.setVisible(true);
class MainPanel extends JPanel implements MouseListener, MouseMotionListener {
    private JPanel palette;
    private String adding="";
    private SubPanel hitPanel;
    private int deltaX, deltaY, oldX, oldY;
    private final int TOL = 4; //tolerance
    public MainPanel() {
        setLayout(null);
        addMouseListener(this);
        addMouseMotionListener(this);
    public void mousePressed(final MouseEvent e) {
        if( adding != "" ){
            setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
            SubPanel sub = new SubPanel(adding);
            add(sub);
            sub.setSize(sub.getPreferredSize());
            sub.setLocation((int)e.getX(),(int)e.getY());
            revalidate();
            adding = "";
            return;
        Component c = getComponentAt(e.getPoint());
        if (c instanceof SubPanel) {
            hitPanel = (SubPanel) c;
            oldX = hitPanel.getX();
            oldY = hitPanel.getY();
            deltaX = e.getX() - oldX;
            deltaY = e.getY() - oldY;
            if( oldX < e.getX()-TOL ) oldX += hitPanel.getWidth();
            if( oldY < e.getY()-TOL ) oldY += hitPanel.getHeight();
    public void mouseDragged(final MouseEvent e) {
        if (hitPanel != null) {
            int xH = hitPanel.getX();
            int yH = hitPanel.getY();
            int xDiff = e.getX()-oldX;
            int yDiff = e.getY()-oldY;
            int cursorType = hitPanel.getCursor().getType();
            if( cursorType == Cursor.W_RESIZE_CURSOR){           //West resizing
                hitPanel.setBounds( e.getX(), yH, hitPanel.getWidth() - xDiff, hitPanel.getHeight() );
            }else if( cursorType == Cursor.N_RESIZE_CURSOR){     //North resizing
                hitPanel.setBounds( xH, e.getY(), hitPanel.getWidth(), hitPanel.getHeight() - yDiff );
            }else if( cursorType == Cursor.S_RESIZE_CURSOR){     //South resizing
                hitPanel.setSize( hitPanel.getWidth(), hitPanel.getHeight() + yDiff );
            }else if( cursorType == Cursor.E_RESIZE_CURSOR){     //East resizing
                hitPanel.setSize( hitPanel.getWidth() + xDiff, hitPanel.getHeight() );
            }else if( cursorType == Cursor.NW_RESIZE_CURSOR){     //NorthWest resizing
                hitPanel.setBounds( e.getX(), e.getY(), hitPanel.getWidth() - xDiff, hitPanel.getHeight() - yDiff );
            }else if( cursorType == Cursor.NE_RESIZE_CURSOR){     //NorthEast resizing
                hitPanel.setBounds( xH, e.getY(), hitPanel.getWidth() + xDiff, hitPanel.getHeight() - yDiff );
            }else if( cursorType == Cursor.SW_RESIZE_CURSOR){     //SouthWest resizing
                hitPanel.setBounds( e.getX(), yH, hitPanel.getWidth() - xDiff, hitPanel.getHeight() + yDiff );
            }else if( cursorType == Cursor.SE_RESIZE_CURSOR){     //SouthEast resizing
                hitPanel.setBounds( xH, yH, hitPanel.getWidth() + xDiff, hitPanel.getHeight() + yDiff );
            }else{      //moving subpanel
                hitPanel.setLocation( e.getX()-deltaX, e.getY()-deltaY );
            oldX = e.getX();
            oldY = e.getY();
    public void mouseMoved(final MouseEvent e) {
        Component c = getComponentAt(e.getPoint());
        if (c instanceof SubPanel) {
            int x = e.getX();
            int y = e.getY();
            int xC = c.getX();
            int yC = c.getY();
            int w = c.getWidth();
            int h = c.getHeight();
            if(       y >= yC-TOL   && y <= yC+TOL && x >= xC-TOL   && x <= xC+TOL ){
                c.setCursor(new Cursor(Cursor.NW_RESIZE_CURSOR));
            }else if( y >= yC-TOL   && y <= yC+TOL && x >= xC-TOL+w && x <= xC+TOL+w ){
                c.setCursor(new Cursor(Cursor.NE_RESIZE_CURSOR));
            }else if( y >= yC-TOL+h && y <= yC+TOL+h && x >= xC-TOL   && x <= xC+TOL ){
                c.setCursor(new Cursor(Cursor.SW_RESIZE_CURSOR));
            }else if( y >= yC-TOL+h && y <= yC+TOL+h && x >= xC-TOL+w && x <= xC+TOL+w ){
                c.setCursor(new Cursor(Cursor.SE_RESIZE_CURSOR));
            }else if( x >= xC-TOL   && x <= xC+TOL ){
                c.setCursor(new Cursor(Cursor.W_RESIZE_CURSOR));
            }else if( y >= yC-TOL   && y <= yC+TOL ){
                c.setCursor(new Cursor(Cursor.N_RESIZE_CURSOR));
            }else if( x >= xC-TOL+w && x <= xC+TOL+w ){
                c.setCursor(new Cursor(Cursor.E_RESIZE_CURSOR));
            }else if( y >= yC-TOL+h && y <= yC+TOL+h ){
                c.setCursor(new Cursor(Cursor.S_RESIZE_CURSOR));
            }else{
                c.setCursor(new Cursor(Cursor.MOVE_CURSOR));
    public void mouseReleased(final MouseEvent e) { hitPanel = null; }
    public void mouseClicked(final MouseEvent e) {}
    public void mouseEntered(final MouseEvent e) {}
    public void mouseExited(final MouseEvent e) {}
    public void setAdding(final String string) {
        adding = string;
        setCursor(new Cursor(Cursor.HAND_CURSOR));
    public void setPalette(final JPanel panel) { palette = panel; }
class SubPanel extends JPanel {
    public SubPanel(final String name) {
        setPreferredSize(new Dimension(100, 100));
        setBorder(new TitledBorder(new LineBorder(Color.BLACK), name));
}This application works with JFrame, but I want to display the JFrame in a webapplication (JSP Page).
I'm using Netbeans 6.0 (GlassFish) to create webapplication using Visual Web JavaServer Faces.
So in summary:
How can i display the drag and drop application into a JFrame (better in a JPanel) in a webapplication (index.jsp)??
Hope you can help...
Thanks in advance...
Greetings,
Rajsh

So have an applet that opens a JFrame... JSP or not has nothing to do with it, since it's nothing but HTML the client gets.
You can't have a JFrame embedded in an HTML page. And if you could have an applet but don't know how to get that copied code to fit inside (I mean, content pane is content pane), you might want to consider learning how to do that.

Java in Web application designer

hi all,
can any one tell me where u will be implementing java code in WAD.
i mean can u tell me the scenario where we can write java script coding in WAD.
thanks in advance..
Ram

Hi,
check this link for ur answer...
Using java Script in Web Application Designer

Web Application Shows Pop up message after Upgrading to Java 7 Update 11

Hello,
We have developed a Java based Enterprise Web Application and currently using in Production environment. With the recent Java Security vulnerability issue, the client machines (desktops) were upgraded to Java 7 update 11 (Java plugin for Web browser). After the upgrade, users are having issues in accessing the application. User gets a Security Warning popup - "Do you want to run this application? An Application from the location below is requesting permission to run Location: xyz.... ". Even if they check the "Do not show this again for this app" checkbox, it still shows the Security Warning popup for every screen clicked by the user. The Application has "Trusted Certificate" but using a 3rd party jar which has an unsigned applet. The popup goes away if we change security level to Medium. We don't want to reduce the security level from 'High' to 'Medium' because of the Security issues and users may access other websites.
Is there a way to resolve the unsigned applet issue without compromising the security?
Thanks
Padmanaban

With Java 7u11 Oracle increased the default security level to help reduce the of recently discovered exploits getting past the security sandbox.
That said, I seem to recall from a few years ago that any untrusted component delivered to the client might cause the entire application to be treated as untrusted (as it should), and this may be the case here.
Although license issues may prevent you from doing this, I have found that unpacking and then repacking-and-resigning (with your own key) all 3rd party JARs can get around this, but only you can decide whether this is (a) legal and (b) advisable in the first place.

Instantiating a eInsight business process through web application

Hi all,
Has anybody ever tried instantiating a eInsight business process involving user activities by clicking a link on a web application? All the tutorials I have seen so far are all based on input files. Could anybody please refer me to some sample where a eInsight process is started by clicking a link or rather interactively.
Thanks & Regards,
Sujoy

An eInsight Business Process is instantated when a message for its initial Receive Activity becomes available for delivery. If you contrive to deliver a message to eInsight's BP from a Web Applicatin you will achieve the result you seek. The receive activity can be associated with a File eWay, a JMS Client end-point or any numer of other end points/adapters/connectors capable of receiving a message. You could, for example, use the JMS API Kit in a JSP in your web application to send a message to a JMS Receive activity that starts the BP. That presupposes that your web application is external to the Java CAPS solution. You could also build your web application using the eVision product, which is specifically designed to allow you to build Java CAPS-based web applications/composite applications. Have a look at eVision to see if you can use that to achieve what you need to achieve.

Java web start fails to launch application when java cache is off

Hi,
there's no problem when java cache is used but when java cache isn't used, my application fails to launch via jws (jnlp).
the following is the error
java.lang.NullPointerException
at java.util.jar.JarVerifier.mapSignersToCodeSource(Unknown Source)
at java.util.jar.JarVerifier.mapSignersToCodeSources(Unknown Source)
at java.util.jar.JarVerifier.getCodeSources(Unknown Source)
at java.util.jar.JarFile.getCodeSources(Unknown Source)
at java.util.jar.JavaUtilJarAccessImpl.getCodeSources(Unknown Source)
at com.sun.deploy.cache.DeployCacheJarAccessImpl.getCodeSources(Unknown Source)
at com.sun.javaws.security.SigningInfo.getCommonCodeSignersForJar(Unknown Source)
at com.sun.javaws.security.SigningInfo.check(Unknown Source)
at com.sun.javaws.LaunchDownload.checkSignedResourcesHelper(Unknown Source)
at com.sun.javaws.LaunchDownload.checkSignedResources(Unknown Source)
at com.sun.javaws.Launcher.prepareResources(Unknown Source)
at com.sun.javaws.Launcher.prepareAllResources(Unknown Source)
at com.sun.javaws.Launcher.prepareToLaunch(Unknown Source)
at com.sun.javaws.Launcher.prepareToLaunch(Unknown Source)
at com.sun.javaws.Launcher.launch(Unknown Source)
at com.sun.javaws.Main.launchApp(Unknown Source)
at com.sun.javaws.Main.continueInSecureThread(Unknown Source)
at com.sun.javaws.Main$1.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
this is the jnlp file
<?xml version="1.0" encoding="UTF-8"?>
<jnlp spec="1.0+" version="1.0" codebase="http://11.4.100.41" href="secuiNXG.jnlp">
<information>
<title>secuiNXG U start GUI</title>
<vendor>secui.com Ltd.</vendor>
<homepage href="/"/>
<icon href="web_login_ci.gif"/>
<shortcut online="true">
<desktop/>
<menu submenu="secuiNXG U"/>
</shortcut>
</information>
<security>
<all-permissions/>
</security>
<resources>
<j2se version="1.4+" initial-heap-size="50m" max-heap-size="250m" />
<jar href="SES.jar"/>
<jar href="skin_alloy.jar"/>
<jar href="Borders.jar"/>
<jar href="informa.jar"/>
<jar href="jaxen-1.1-beta-12.jar"/>
<jar href="jcelements.jar"/>
<jar href="jctable.jar"/>
<jar href="jdom.jar"/>
<jar href="log4j-1.2.14.jar"/>
<jar href="jnlp.jar"/>
<jar href="jxl.jar"/>
</resources>
<application-desc main-class="secui.firewall.SecuiLogin">
<argument>11.4.100.41:80</argument>
</application-desc>
</jnlp>Test Environment
JRE : 1.6.0_19
O/S : Windows 7 (32 bit)
Browser : IE8
I checked for other versions of jre but not using java cache didn't cause any problems.
I checked for the release note of update 19 but I have no clue.
Is there any way to launch java application without using java cache?

greencosmos wrote:
..I had a problem changing the cache location. The button for this action is disabled. I can't figure out how to enable it.On my system, it is enabled when the 'cache files' box is checked, and disabled when it isn't.
1) Without changing the location I assumed that deleting the cached files could be a similar job, so I clicked "Delete Files..." and deleted with all checkboxes checked.I am not convinced that would entirely clear the cache, but have done no specific tests to check.
2) I unchecked "Keep temporary files on my computer".So it was checked when you were trying to change the cache location?
3) Applied all the changes.
4) I launched your demo.
Result - It was launched without any prompt.
I revisited the page with the URL and successfully launched the app. again.The application launched just fine, but no prompt.
If you follow those (links and) steps I outlined exactly, does the file service demo launch twice for you?I'm sorry I don't exactly understand your question. .. Your description is enough to convince me that answer is 'yes'.
..I tried twice and it launched twice, but not twice at the same time(it launched once at a time).Surprise, surprise. That is the first mention in this thread of 'same time'/'simultaneously'. Care to share the other defining factors that you forgot to mention, or is guessing part of the 'fun' of helping?
But still I'm having problems with launching my application.
I assume that it could be jnlp syntax problem. The "main=true" subelement is missing.It is a good idea to validate the launch files of JWS based launches that are failing for any reason. For that purpose, I offer JaNeLA.
Having said that, a missing main='true' will not be detected by JaNeLA, since it is not a compulsory attribute. ..But check them anyway.

Web Application - Data caching of enterprise data

Sorry in advance if this is off-topic but I can't find anywhere else to post this type of question.
I am looking for information/suggestions such as books, technology or design methodology for my enterprise web applications. These sites are currently up and functional using only JSP, servlets and regular Java classes stored in a web application session to provide data caching and access. We are using Weblogic Server 6.1 running on an AIX Unix system at this time. I'm not sure that this is the best design architecture as our web sessions are getting too large but I can't think of any other Java technology to use and I need some help. Here's an overview of our environment and our needs.
Our core data is held in a mainframe based IMS system. Some DB2 is also used. Access to this data is through IMS COBOL transactions which we can execute with IMS Connect. We also use some JDBC to get to the DB2 tables directly where available.
Some overall application data is cached when the web application is deployed. We use singleton classes which are created and refreshed at deployment and they then refresh themselves from the sources every 24 hours.
Each time a user logs in we execute several IMS transactions and JDBC calls to cache user specific data in regular Java classes which are then simply placed in the users web session where we access them from JSP, servlets and other Java classes. The fields in these Java classes range from any type of primitive field to TreeMaps of other Java classes. As the data is cached it is sorted and other fields are calculated and stored in these classes. As the user progresses through the system we then may have to do several other IMS transaction and JDBC calls to collect other types of data. All of this is then also added to the users session. Most of this in inquiry. We do allow transactions but those are built from user input and data already cached and are then we just execute the IMS transactions with the input.
As our application has grown these Java classes have gotten larger and larger. And since these are simply stored in server memory in the web sessions then these are also getting huge. I'm concerned that this is not the best way for this application to be architected. Is there something else we should be doign? I simply don't understand how Entity Java Beans could be used but then again I don't know much about them. I wouldn't think that caching the data to a local database and accessing it from there would be any more efficient and would probably just slow down the system from all the I/O.
Any help or direction would be greatly appreciated.

The best book you can buy is 'Professional Java Server Programming, j2ee edition' by Wrox. It is by far the best reference I've used. Another quick reference consideration might be the j2ee book provided by codenotes... its quick and to the point.

I am facing a caching problem in the Web-Application that I've developed us

Dear Friends,
I am facing a caching problem in the Web-Application that I've developed using Java/JSP/Servlet.
Problem Description: In this application when a hyperlink is clicked it is supposed to go the Handling Servlet and then servlet will fetch the data (using DAO layer) and will store in the session. After this the servlet will forward the request to the view JSP to present the data. The JSP access the object stored in the session and displays the data.
However, when the link is clicked second time then the request is not received by our servlet and the cached(prev data) page is shown. If we refresh the page then request come to the servlet and we get correct data. But as you will also agree that we don't want the users to refresh the page again and again to get the updated data.
We've included these lines in JSPs also but it does no good:
<%
response.setHeader("Expires", "0");
response.setHeader("Cache-Control" ,"no-cache, must-revalidate");
response.setHeader("Pragma", "no-cache");
response.setHeader("Cache-Control","no-store");
%>
Request you to please give a solution for the same.
Thanks & Regards,
Mohan

However, when the link is clicked second time then the request is not received by our servlet Impossible mate.. can you show your code. You sure there are no javascript errors ?
Why dont you just remove your object from the session after displaying the data from it and see if your page "automatically" hits the servlet when the link is clicked.
cheers..
S

Hi, I developed a web application using HTML5-Offline Application Cache mechanism. Inspite of deleting the cache as mentioned in the above steps, Firefox still maintains a copy of the page in it's cache. Also, a serious bug is, even though we delete all

== Issue
==
I have a problem with my bookmarks, cookies, history or settings
== Description
==
Hi,
I developed a web application using HTML5-Offline Application Cache mechanism. Inspite of deleting the cache as mentioned in the above steps, Firefox still maintains a copy of the page in it's cache. Also, a serious bug is, even though we delete all temp files used by Firefox, and open the previously cached page, it displays it correctly, but upon refreshing/reloading it again shows the previous version of the page maintained in the cache.
== Troubleshooting information
==
HTML5: Application Caching
.style1 {
font-family: Consolas;
font-size: small;
text-align: left;
margin-left: 80px;
function onCacheChecking(e)
printOutput("CHECKINGContents of the manifest are being checked.", 0);
function onCacheCached(e) {
printOutput("CACHEDAll the resources mentioned in the manifest have been downloaded", 0);
function onCacheNoUpdate(e)
printOutput("NOUPDATEManifest file has not been changed. No updates took place.", 0);
function onCacheUpdateReady(e)
printOutput("UPDATEREADYChanges have been made to manifest file, and were downloaded.", 0);
function onCacheError(e) {
printOutput("ERRORAn error occured while trying to process manifest file.", 0);
function onCacheObselete(e)
printOutput("OBSOLETEEither the manifest file has been deleted or renamed at the source", 0);
function onCacheDownloading(e) {
printOutput("DOWNLOADINGDownloading resources into local cache.", 0);
function onCacheProgress(e) {
printOutput("PROGRESSDownload in process.", 0);
function printOutput(statusMessages, howToTell)
* Outputs information about an event with its description
* @param statusMessages The message string to be displayed that describes the event
* @param howToTell Specifies if the output is to be written onto document(0) or alert(1) or both(2)
try {
if (howToTell == 2) {
document.getElementById("stat").innerHTML += statusMessages;
window.alert(statusMessages);
else if (howToTell == 0) {
document.getElementById("stat").innerHTML += statusMessages;
else if (howToTell == 1) {
window.alert(statusMessages);
catch (IOExceptionOutput) {
window.alert(IOExceptionOutput);
function initiateCaching()
var ONLY_DOC = 0;
var ONLY_ALERT = 1;
var BOTH_DOC_ALERT = 2;
try
if (window.applicationCache)
var appcache = window.applicationCache;
printOutput("BROWSER COMPATIBILITYSUCCESS!! AppCache works on this browser.", 0);
appcache.addEventListener('checking', onCacheChecking, false);
appcache.addEventListener('cached', onCacheCached, false);
appcache.addEventListener('noupdate', onCacheNoUpdate, false);
appcache.addEventListener('downloading', onCacheDownloading, false);
appcache.addEventListener('progress', onCacheProgress, false);
appcache.addEventListener('updateready', onCacheUpdateReady, false);
appcache.addEventListener('error', onCacheError, false);
appcache.addEventListener('obsolete', onCacheObselete, false);
else
document.getElementById("stat").innerHTML = "Failure! I cant work.";
catch (UnknownError)
window.alert('Internet Explorer does not support Application Caching yet.\nPlease run me on Safari or Firefox browsers\n\n');
stat.innerHTML = "Failure! I cant work.";
== Firefox version
==
3.6.3
== Operating system
==
Windows XP
== User Agent
==
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3 ( .NET CLR 3.5.30729; .NET4.0E)
== Plugins installed
==
*-Shockwave Flash 10.0 r45
*Default Plug-in
*Adobe PDF Plug-In For Firefox and Netscape "9.3.2"
*NPRuntime Script Plug-in Library for Java(TM) Deploy
*The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
*Google Update
*4.0.50524.0
*Office Live Update v1.4
*NPWLPG
*Windows Presentation Foundation (WPF) plug-in for Mozilla browsers
*Next Generation Java Plug-in 1.6.0_20 for Mozilla browsers
*Npdsplay dll
*DRM Store Netscape Plugin
*DRM Netscape Network Object
Thanks & Regards,
Kandarpa Chandrasekhar Omkar
Software Engineer
Wipro Technologies
Bangalore.
[email protected]
[email protected]

We have had this issue many, many times before including on the latest 3.6 rev. It appears that when the applicationCache has an update triggered by a new manifest file, the browser may still use only its local network cache to check for updates to the files in the manifest, instead of forcing an HTTP request and revalidating both the browser cache and the applicationCache versions of the cached file (seems there is more than one). I have to assume this is a browser bug, as one should not have to frig with server Cache-Control headers and such to get this to work as expected (and even then it still doesn't sometimes).
The only thing that seems to fix the problem is setting network.http.use-cache to false (default is true) in about:config . This helps my case because we only ever run offline (applicationCache driven) apps in the affected browser (our managed mobile apps platform), but it will otherwise slow down your browser experience considerably.

JAVA Caching in Web Application

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