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• Introduction to JBatch

  - by reza_rahman

  It seems batch processing is moving more and more into the realm of the Java developer. In recognition of this fact, JBatch (aka Java Batch, JSR 352, Batch Applications for the Java Platform) was added to Java EE 7. In a recent article JBatch specification lead Chris Vignola of IBM provides a high level overview of the API. He discusses the core concepts/motivation, the Job Specification Language, the reader-processor-writer pattern, job operator, job repository, chunking, packaging, partitions, split/flow and the like. You can also check out the official specification yourself or try things out with the newly released Java EE 7 SDK.

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• How can a script detect if the user is idle

  - by josinalvo

  I want to check, inside a bash script (*), how much time the user of a X session has been idle The user himself does not have to be using bash, but just X. If the user just moved the mouse, for example, a good answer would be "idle for 0 seconds". If he has not touched the computer in 5 minutes, a good answer would be "idle for 300 seconds" The reason to not use xautolock straight away is to be able to implement some complex behavior. For example, if the user is idle for 10 minutes, try to suspend, if he is idle for more 5 minutes, shutoff (I know it sounds odd, but suspend does not always work here ...) (*)or could be another language.

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• Is there any way to add a MouseListener to a Graphic object ?

  - by Fahad

  Hi, Is there any way to add a MouseListener to a Graphic object. I have this simple GUI that draw an oval. What I want is handling the event when the user clicks on the oval import java.awt.*; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import javax.swing.*; public class Gui2 extends JFrame { JFrame frame = new JFrame(); MyDrawPanel drawpanel = new MyDrawPanel(); public static void main(String[] args) { Gui2 gui = new Gui2(); gui.go(); } public void go() { frame.getContentPane().add(drawpanel); // frame.addMouseListener(this); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(300, 300); frame.setVisible(true); } } class MyDrawPanel extends JComponent implements MouseListener { public void paintComponent(Graphics g) { int red = (int) (Math.random() * 255); int green = (int) (Math.random() * 255); int blue = (int) (Math.random() * 255); Color startrandomColor = new Color(red, green, blue); red = (int) (Math.random() * 255); green = (int) (Math.random() * 255); blue = (int) (Math.random() * 255); Color endrandomColor = new Color(red, green, blue); Graphics2D g2d = (Graphics2D) g; this.addMouseListener(this); GradientPaint gradient = new GradientPaint(70, 70, startrandomColor, 150, 150, endrandomColor); g2d.setPaint(gradient); g2d.fillOval(70, 70, 100, 100); } @Override public void mouseClicked(MouseEvent e) { if ((e.getButton() == 1) && (e.getX() >= 70 && e.getX() <= 170 && e.getY() >= 70 && e .getY() <= 170)) { this.repaint(); // JOptionPane.showMessageDialog(null,e.getX()+ "\n" + e.getY()); } } @Override public void mouseEntered(MouseEvent e) { // TODO Auto-generated method stub } @Override public void mouseExited(MouseEvent e) { // TODO Auto-generated method stub } @Override public void mousePressed(MouseEvent e) { // TODO Auto-generated method stub } @Override public void mouseReleased(MouseEvent e) { // TODO Auto-generated method stub } } This Works Except it fires when the click is within a virtual box around the oval. Could anyone help me to have it fire when the click is EXACTLY on the oval. Thanks in advance.

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• button and drop down controls events firing every alternate times

  - by Phani Kumar PV

  I am having a drop down list control and a button in user control. the button click event is registered dynamically. this event i sgetting fired every alternating time. dont know the reason why it is behaving so. later added the selected index changed to the drop down list control. this also is getting fired alternate times. the user control is invoked in a sharepoint web part. any pointers are greatly appreciated..

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• WPF webbrowser - get HTML downloaded?

  - by Mathias Lykkegaard Lorenzen

  I'm listening to the WPF webbrowser's LoadCompleted event. It has some navigation arguments which provide details regarding the navigation. However, e.Content is always null. Am I paying attention to the wrong event here? How can I fetch the HTML that was just downloaded as string? I tried some things which I would consider hacks, but they return a string of HTML, even though that was not the string downloaded. For instance, with that method when I go to a page which just sends me the string abc, I get the result <document><body>abc</body></document> or something similar. I would prefer not getting into any more hacks than nescessary to get this running.

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• RTOS experience

  - by Subbu

  I have been working as an embedded software engineer on mostly 8 bit micro-controller firmware and desktop/mobile applications development for the past five years. My work on a WinCE project (in which I got introduced to .NET CF) was short lived. I did use core APIs for interrupt processing, peripheral communication, etc...but again, not exactly a pure RTOS environment. In order to get together more solid experience for growing more in the embedded field, I want to work more with RTOSes. Will buying an evaluation board with an RTOS and putting together a project at home be regarded as a good experience or will an online course be more useful? I am just not clear as to what will be regarded as good experience. Any suggestions or directions will greatly help me. I have a passion for the field but just a need a point in the right direction.

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• What are the best patterns/designs for stateful API development?

  - by Svante

  I am about to implement a API for my TCP/IP server written in Java. Right now I have a temporary method that takes a String, executes a command based on the String and returns a String basically like the following. public void communicate(BufferedReader in, PrintWriter out) { while(true) { out.println(handleCommand(in.readLine())); } } private String handleCommand(String command) { if (command.equals("command1") { // do stuff return "Command 1 executed"; } else if (command.equals("command2") { // do some other stuff return "Command 2 executed"; } } I really want to do something more extensible, smarter and stateful, so I could handle more complex and stateful commands and without the method/class getting bloated. How would you start? Suggestions, ideas, or links for further reading are very welcome.

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• Connection timeout in java?

  - by mabuzer

  Is there any way to fire an event if HttpURLConnection has timeout before complete?

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• QGraphicsItem doesn't receive mouse hover events

  - by Jen

  I have a class derived from QGraphicsView, which contains QGraphicsItem-derived elements. I want these elements to change color whenever the mouse cursor hovers over them, so I implemented hoverEnterEvent (and hoverLeaveEvent): void MyGraphicsItem::hoverEnterEvent(QGraphicsSceneHoverEvent* event) { update (boundingRect()); } However, this event handler code is never executed. I've explicitly enabled mouse tracking: MyGraphicsView::MyGraphicsView(MainView *parent) : QGraphicsView(parent) { setMouseTracking(true); viewport()->setMouseTracking(true); ... } Still, no luck. What am I doing wrong?

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• Attention All Procurement Buyers!

  - by LuciaC

  Have you discovered the power of the Buyer Work Center?   Released in Procurement 12.0 the Professional Buyer Work Center (BWC) is a web based interface that provides a central 'launch pad' from which you can efficiently perform your daily tasks, including:  You can manage your requisitions and create them to Purchase Orders (like manual autocreate) Create new standard purchase orders, blanket purchase agreements, or contract purchase agreements Create and maintain supplier information If Oracle Sourcing is licensed and implemented, you can create buyer's auctions or sourcing RFQs If Oracle Services Procurement is licensed and implemented you can create and maintain purchase orders for complex work payments If Oracle Procurement Contracts is licensed and implemented you can handle author contract terms and manage deliverables Globally for the BWC: Create and personalize your own document views including list of columns, where conditions and sort sequences. You can additionally use predefined document views. Accessed from the Purchasing responsibility as we see in the screenshot here, the Buyer Work Center has links to launch to the areas you want to access. See these documents for more information on the BWC: Doc ID 1301969.1: FAQ - Buyer Work CenterDoc ID 1394392.1: Assistant: Oracle Purchasing Purchasing Buyer Work Center Search Helper.

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• The ETL from Hell - Diagnosing Batch System Performance Issues

  Too often, the batch systems that underlie a lot of database processing just grow without conscious design. When runs start to extend beyond their allotted time, and tuning no longer solves the problem, it is often discovered that batches are run in series, with draconian error handling. It is time to impose some rational design, and Nigel is a seasoned healer of batch processes. The seven tools in the SQL DBA Bundle support your core SQL Server database administration tasks.Make backups a breeze! Enjoy trouble-free troubleshooting! Make the most of monitoring! Download a free trial now.

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• Vanilla forum personal journal tool

  - by user16648

  I am developing a forum for a research project, i am using Vanilla forum (though i am not tied to this yet). Another feature of this site will be a personal journal/diary/blog. Only the user and administrators will have access to the journal. The journal does not need any advanced features. Does anybody have any suggestions on software/script that could easily be integrated with Vanilla forum for this purpose? My first thought was using Wordpress but it is a bit to complex to adminstrate as the site is meant to be simple. And i dont really see how it can be intregrated easily the way i want it.

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• Petstore using Java EE 6 ? Almost!

  - by arungupta

  Antonio Goncalves, a Java Champion, JUG leader, and a well-known author, has started building a Petstore-like application using Java EE 6. The complete end-to-end sample application will build a eCommerce website and follows the Java EE 6 design principles of simple and easy-to-use to its core. Its using several technologies from the platform such as JPA 2.0, CDI 1.0, Bean Validation 1.0, EJB Lite 3.1, JSF 2.0, and JAX-RS 1.1. The two goals of the project are: • use Java EE 6 and just Java EE 6 : no external framework or dependency • make it simple : no complex business algorithm The application works with GlassFish and JBoss today and there are plans to add support for TomEE. Download the source code from github.com/agoncal/agoncal-application-petstore-ee6. And feel free to fork if you want to use a fancy toolkit as the front-end or show some nicer back-end integration. Some other sources of similar end-to-end applications are: • Java EE 6 Tutorial • Java EE 6 Galleria • Java EE 6 Hands-on Lab

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• Do I have to learn html and javascript to create web applications?

  - by vainolo

  I am an experienced Java programmer, and I want to create a complex web application requiring dynamic pages, drawings, etc (take SO as an example). Do I have to learn javascript/html in order to create such an application? It is not that I don't want to learn another language (I've done this before), but technology on the javascript environment seems to change so fast that when you finish learning one framework it is already obsolete. I have checked a number of java framework for web development (spring, play), but not deeply. So can these frameworks (or other possible java frameworks that I'm not aware of) be used without learning html/javascript? I also have some python experience. So if I can do the app in python it is also an option.

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• Is content slowing down your business?

  - by Lance Shaw

  We are living in a digital world, however paper is everywhere and expensive, right? We all agree content is an important part of our organization and contribute to its decision making. However many of us see dealing with this as a challenge and the growth of content is impacting our ability to scale and respond quickly to our customers. Business always has been content intensive. For JD Edwards customers, this is an important consideration.  After all, the processes being run in JD Edwards are usually very critical to the success of your business and if they are not running as smoothly as they should due to manual process steps involving paper or searching for content, you should look into improving them.  To that end, we hope you will join this webinar and learn how Oracle and KPIT | SYSTIME have partnered to help a JD Edwards customer content-enable its enterprise with Oracle WebCenter Content and Oracle WebCenter Imaging 11g and integrate them back with JD Edwards to significantly improve processing speed and operational costs.

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• javascript __doPostBack doesn't seem to work for me...

  - by Pandiya Chendur

  I use yui datatable in my asp.net application... I have a link button in one of my columns and it works fine but doesn't do a postback of a hidden button... myDataTable.subscribe("linkClickEvent", function(oArgs) { javascript: __doPostBack('ctl00_ContentPlaceHolder1_Button1', ''); YAHOO.util.Event.stopEvent(oArgs.event); }); and in my page <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" style="display:none;" /> protected void Button1_Click(object sender, EventArgs e) { DownloadFile(Hfhref.Value, true); } I used break point but it doesn't seem to get the __dopostback.. Any suggestion...

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• capturing click events on web-browser scrollbars

  - by The Code Pimp

  Hi, is it possible to capture a click event on a scrollbar? I have some code where i am observing the click and mousedown events on the document. However, it seems that when I click on the scrollbar, the event is not captured. This leads me to believe that the scrollbars aren't really part of the document. (Assumption :-)) Is this a correct assumption? What is the right way to do this so that the behaviour is consistent across all major browsers? sample code document.observe('click', function(evt){ //do something //blah blah blah }); Thanks

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• Trouble using Canon MG 2440 printer in UBUNTU 14

  - by user264795

  I connected usb serial cable from printer to computer. The drivers has been installed automatically. I printed the test page - it was printed. I tryed to print an image - it stays with status - processing... and dont work. Test page also cant be printed. What a problem? I dont know exactly, but I think I use "CUPS" manager and drivers... now status Waiting for printer to become available. And do not print.

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• How do I get to the maintenace shell?

  - by Narida

  I'm asking this because initially, my problem was this (power failure during installation, so I typed the following instructions in the maintenance shell: sudo mount -o remount,rw / sudo dpkg --configure a sudo mount -o remount,ro / sudo sync sudo reboot The first three lines worked, afterwards, my computer (a Dell Inspiron 530) got stalled for several hours, so I unplugged it. When I turned it on, the log in screen appeared, and after I try to write my password, it leads me back to the log screen. I must note that when I typed the first three lines during the maintenance shell mode, it said that the errors which were encountered during processing were: initscripts bluez gnome-bluetooth So, what do I have to do in order to get back to the maintenance shell so I can type code again? And, what code do I have to write in order to restore my computer? Thank you for your attention.

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• JSR Updates and Inactive JSR ballots

  - by heathervc

  The following are JSRs have posted updates in the last week: JSR 331, Constraint Programming API, has posted a Maintenance Draft Review; this review closes 29 September. JSR 352, Batch Applications for the Java Platform, has posted an Early Draft Review; this review closes 29 September. JSR 353, Java API for JSON Processing, has posted an Early Draft Review; this review closes 7 October. Inactive JSRs: The following JSR proposals have been Inactive for at least two years and are currently on the EC ballot to be declared Dormant, following a period where the community was given an opportunity to express interest in their continued development: JSR 50, Distributed Real-Time Specification JSR 282, Real-Time Specification for Java (RTSJ) 1.1 JSR 307, Network Mobility and Mobile Data API JSR 327, Dynamic Contents Delivery Service API for Java ME JSR 328, Change Management API

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• Writing a dynamic achievement system without hardcoding rules into the application

  - by imaginative

  I really enjoyed the solution provided here for groundwork on writing an achievement framework. The problem I have is I have game designers that would like to be able to insert achievements into a CMS at runtime. In a way, it sounds insane and complex to do this, but is it really? I think the concept of having to do a hard push of the application for every new achievement is cumbersome. I would love to be able to give our designers the capability to put together new achievements by entering them into a database. It shouldn't matter what tool I'm using, but for those interested, my backend is being written in JRuby (Ruby on top of the JVM). What are some possible ways of going about abstracting the logic in the aforementioned link even further so that rules can be interpreted at runtime?

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• Maya is lagging in a specific way...?

  - by Aerovistae

  My Maya installation worked perfectly. It is not my computer. Something caused it to stop working overnight, somehow. When I try to drag a vertex or something like that, it moves the vertex, but then I have to click like 3 times somewhere outside the mesh before the actual mesh will catch up and follow the vertex. Until I do that, it just stays as it was, with a floating vertex somewhere inside it or outside it. It makes modeling borderline impossible and completely infuriating. What ought to be happening is what we're all used to-- as I move the vertex, the mesh follows it actively, so I can see what it looks like at every given moment until I release the vertex in its new position. Other weird thing: this only applies to complex meshes, like a couple thousand faces. A simple cube works fine. What gives?? Anybody?

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• Should I use the factory design pattern for every class?

  - by Frog

  I've been writing a website in PHP. As the code becomes more complex, I keep finding problems that can be solved using the factory design pattern. For example: I've a got a class Page which has subclasses HTMLPage, XMLPage, etc. Depending on some input I need to return an object of either one of these classes. I use the factory design pattern to do this. But as I encounter this problem in more classes, I keep having to change code which still initiates an object using its constructor. So now I'm wondering: is it a good idea to change all code so that it uses the factory design pattern? Or are there big drawbacks? I'm currently in a position to change this, so your answers would be really helpful.

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• Do you find it a challenge diagnosing issues with creating Requisitions to Purchase Orders Automatically?

  - by LindaJ-Oracle

  Do you find it a challenge diagnosing issues when there are problems with creating Requisitions to Purchase Orders automatically?  Well it has become much easier with the newly enhanced 'CREATEPO Workflow - Data Collection Script' available in Doc ID 1415918.1.Run the diagnostic and the output will include all the necessary information for problem solving; including: 1) Profile Option Values2) Default values for CREATEPO attributes3) Requisition header and line information4) Document Setup for requisitions5) Requisition approval workflow activity, attributes, errors and validation checks6) CREATEPO overall workflow activity, attributes, errors and validation checks7) CREATEPO requisition processing workflow activity, attributes, errors and validation checks8) CREATEPO approval workflow activity, attributes, errors and validation checks9) PO_WF_DEBUG messages10) Purchase order / Blanket release informationMore importantly now valuable errors and warnings are provided with links to the solutions!So you can potentially resolve the issue on your own, or if you still need Supports help proactively run the diagnostic before logging a Service Request and the data collection will be available for the analyst immediately.  Add Doc ID 1415918.1 to your favorites today.

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• Run a javascript function on script load

  - by user188870

  I am using jQuery. I keep all of my function definitions wrapped in the $(document).ready event in application.js. I have a function from it that I would like to call somewhere in the body of the page I am working on. I was wondering if there is some alternative to the .ready event that will work on a script load. Ideally I would like to do something like: $('application.js').ready( call function ); In the jQuery documentation it only mentions the $(document).ready call but I was wondering if this can be altered or if there is some plain javascript alternative.

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