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  • Using the Coherence ConcurrentMap Interface (Locking API)

    - by jpurdy
    For many developers using Coherence, the first place they look for concurrency control is the com.tangosol.util.ConcurrentMap interface (part of the NamedCache interface). The ConcurrentMap interface includes methods for explicitly locking data. Despite the obvious appeal of a lock-based API, these methods should generally be avoided for a variety of reasons: They are very "chatty" in that they can't be bundled with other operations (such as get and put) and there are no collection-based versions of them. Locks do directly not impact mutating calls (including puts and entry processors), so all code must make explicit lock requests before modifying (or in some cases reading) cache entries. They require coordination of all code that may mutate the objects, including the need to lock at the same level of granularity (there is no built-in lock hierarchy and thus no concept of lock escalation). Even if all code is properly coordinated (or there's only one piece of code), failure during updates that may leave a collection of changes to a set of objects in a partially committed state. There is no concept of a read-only lock. In general, use of locking is highly discouraged for most applications. Instead, the use of entry processors provides a far more efficient approach, at the cost of some additional complexity.

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  • How to Draw Lines on the Screen (Part 2)

    - by Geertjan
    In part 1, I showed how you can click on the screen to create widgets and then connect those widgets together. But that's not really drawing, is it? (And I'm surprised nobody made that point in the comments to that blog entry.) Drawing doesn't really revolve around connecting dots together. It's more about using a free-flow style and being able to randomly write stuff onto a screen, without constraints. Something like this: I achieved the above by changing one line of code from the original referred to above. Instead of using a "mousePressed" event, I'm now using a "mouseDragged" event. That's all. And now the widgets are created when I drag my mouse on the scene. (I removed the rectangular select action, since that's also invoked during dragging and since that doesn't apply to the above scenario.) Now, the next step is to rewrite the NetBeans Platform Paint Application Tutorial, so that the Visual Library is used. That would be pretty cool.

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  • Rendering Flickr Cats Via Backbone.js

    - by Geertjan
    Create a JavaScript file and refer to it inside an HTML file. Then put this into the JavaScript file: (function($) {     var CatCollection = Backbone.Collection.extend({         url: 'http://api.flickr.com/services/feeds/photos_public.gne?tags=cat&tagmode=any&format=json&jsoncallback=?',         parse: function(response) {             return response.items;         }     });     var CatView = Backbone.View.extend({         el: $('body'),         initialize: function() {             _.bindAll(this, 'render');             carCollectionInstance.fetch({                 success: function(response, xhr) {                     catView.render();                 }             });         },         render: function() {             $(this.el).append("<ul></ul>");             for (var i = 0; i < carCollectionInstance.length; i++) {                 $('ul', this.el).append("<li>" + i + carCollectionInstance.models[i].get("description") + "</li>");             }         }     });     var carCollectionInstance = new CatCollection();     var catView = new CatView(); })(jQuery); Apologies for any errors or misused idioms. It's my second day with Backbone.js, in fact, my second day with JavaScript. I haven't seen anywhere online so far where an example such as the above is found, though plenty that do kind of or pieces of the above, or explain in text, without an actual full example. The next step, and the only reason for the above experiment, is to create some JPA entities and expose them via RESTful webservices created on EJB methods, for consumption into an HTML5 application via a Backbone.js script very similar to the above. 

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  • JavaFX Ensemble?Mac App Store?

    - by ksky
    ??:JavaFX Ensemble in the Mac App Store // JavaFX News, Demos and Insight // FX Experience JavaFX????Scott Kovatch?????????????????????????JavaFX????????(??????????????)?Mac App Store?????????????!James Gosling??????????????????????????????????????Ensemble?????javadoc??????????????3D?????????????????100???????????????????????????????JavaFX????????????????????????????JavaFX 2.0????????????????????????????????(Debbie??????????????????!)? Mac App Store?????????????????????????????????????????????????????????JavaFX????JRE?????MacOS X??.app?.dmg?Windows??.exe?.msi?Linux??.deb?.rpm???????????????????????????????????????????????Applet?WebStart??????????????????????????????????????????????????????????????????App Store???????????????????????????????????????Java??????????????Java????????????????????????????Java?????????????????????????????????????????????????????????????????????????? ????????????????????JavaFX???????????????????Mac App Store????????????????????!

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  • Siebel 8.0 – Release Update

    Listen to Mike Betzer, Vice President, Product Strategy discuss Siebel's 8.0 release updates, customer momentum, the CRM On Demand Strategy as well as a preview into what is coming up.

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  • GlassFish/Java EE Community Open Forum Tomorrow!

    - by reza_rahman
    Still have lingering questions on the goals and future of GlassFish? Want to know a little more about the upcoming GlassFish 4.0.1 release? Something on your mind about Java EE 8/GlassFish 5? You have a golden opportunity to pose your questions and speak your mind tomorrow! The good folks over at C2B2 have gone through a lot of time and effort to organize a very useful online event for the London GlassFish User Group - they are having me answer all your questions online, in real time, "face-to-face". Steve Millidge of C2B2 will be moderating the questions and joining the conversation. Did I mention the event was online, free and open to anyone? The event is tomorrow (May 30th), so make sure to register as soon as possible through the C2B2 website (the registration page has more details on the event). It will be held at 4:30 PM BST / 11:30 AM EST / 8:30 AM PST - you must register to participate. Hope to talk to you tomorrow?

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  • PDF to Image Conversion in Java

    - by Geertjan
    In the past, I created a NetBeans plugin for loading images as slides into NetBeans IDE. That means you had to manually create an image from each slide first. So, this time, I took it a step further. You can choose a PDF file, which is then automatically converted to an image for each page, each of which is presented as a node that can be clicked to open the slide in the main window. As you can see, the remaining problem is font rendering. Currently I'm using PDFBox. Any alternatives that render font better? This is the createKeys method of the child factory, ideally it would be replaced by code from some other library that handles font rendering better: @Override protected boolean createKeys(List<ImageObject> list) { mylist = new ArrayList<ImageObject>(); try { if (file != null) { ProgressHandle handle = ProgressHandleFactory.createHandle( "Creating images from " + file.getPath()); handle.start(); PDDocument document = PDDocument.load(file); List<PDPage> pages = document.getDocumentCatalog().getAllPages(); for (int i = 0; i < pages.size(); i++) { PDPage pDPage = pages.get(i); mylist.add(new ImageObject(pDPage.convertToImage(), i)); } handle.finish(); } list.addAll(mylist); } catch (IOException ex) { Exceptions.printStackTrace(ex); } return true; } The import statements from PDFBox are as follows: import org.apache.pdfbox.pdmodel.PDDocument; import org.apache.pdfbox.pdmodel.PDPage;

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  • Fusion Middleware 11gR1 : 4??????

    - by Hiroyuki Yoshino
    ??(2010?4?)??????????????Fusion Middleware 11gR1??????????????? ????????????????? Mainframe and TP-Monitoring Adapters for SOA 11g / CDC Adapters for SOA 11g ???????????????????????? Adapters for CICSAdapters for VSAMAdapters for IMS/TMAdapters for IMS/DBAdapters for TuxedoCDC Adapters for ADABASCDC Adapters for DB2CDC Adapters for IMS/DBCDC Adapters for SQL ServerCDC Adapters for VSAM ?????????????????????????(??)????????????????(??????????????????)????????·????????Adapter Certification??????????????

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  • BeansBinding Across Modules in a NetBeans Platform Application

    - by Geertjan
    Here's two TopComponents, each in a different NetBeans module. Let's use BeansBinding to synchronize the JTextField in TC2TopComponent with the data published by TC1TopComponent and received in TC2TopComponent by listening to the Lookup. The key to getting to the solution is to have the following in TC2TopComponent, which implements LookupListener: private BindingGroup bindingGroup = null; private AutoBinding binding = null; @Override public void resultChanged(LookupEvent le) { if (bindingGroup != null && binding != null) { bindingGroup.getBinding("customerNameBinding").unbind(); } if (!result.allInstances().isEmpty()){ Customer c = result.allInstances().iterator().next(); // put the customer into the lookup of this topcomponent, // so that it will remain in the lookup when focus changes // to this topcomponent: ic.set(Collections.singleton(c), null); bindingGroup = new BindingGroup(); binding = Bindings.createAutoBinding( // a two-way binding, i.e., a change in // one will cause a change in the other: AutoBinding.UpdateStrategy.READ_WRITE, // source: c, BeanProperty.create("name"), // target: jTextField1, BeanProperty.create("text"), // binding name: "customerNameBinding"); bindingGroup.addBinding(binding); bindingGroup.bind(); } } I must say that this solution is preferable over what I've been doing prior to getting to this solution: I would get the customer from the resultChanged, set a class-level field to that customer, add a document listener (or action listener, which is invoked when Enter is pressed) on the text field and, when a change is detected, set the new value on the customer. All that is not needed with the above bit of code. Then, in the node, make sure to use canRename, setName, and getDisplayName, so that when the user presses F2 on a node, the display name can be changed. In other words, when the user types something different in the node display name after pressing F2, the underlying customer name is changed, which happens, in the first place, because the customer name is bound to the text field's value, so that the text field's value will also change once enter is pressed on the changed node display name. Also set a PropertyChangeListener on the node (which implies you need to add property change support to the customer object), so that when the customer object changes (which happens, in the second place, via a change in the value of the text field, as defined in the binding defined above), the node display name is updated. In other words, there's still a bit of plumbing you need to include. But less than before and the nasty class-level field for storing the customer in the TC2TopComponent is no longer needed. And a listener on the text field, with a property change listener implented on the TC2TopComponent, isn't needed either. On the other hand, it's more code than I was using before and I've had to include the BeansBinding JAR, which adds a bit of overhead to my application, without much additional functionality over what I was doing originally. I'd lean towards not doing things this way. Seems quite expensive for essentially replacing a listener on a text field and a property change listener implemented on the TC2TopComponent for being notified of changes to the customer so that the text field can be updated. On the other other hand, it's kind of nice that all this listening-related code is centralized in one place now. So, here's a nice improvement over the above. Instead of listening for a customer, listen for a node, from which the customer can be obtained. Then, bind the node display name to the text field's value, so that when the user types in the text field, the node display name is updated. That saves you from having to listen in the node for changes to the customer's name. In addition to that binding, keep the previous binding, because the previous binding connects the customer name to the text field, so that when the customer display name is changed via F2 on the node, the text field will be updated. private BindingGroup bindingGroup = null; private AutoBinding nodeUpdateBinding; private AutoBinding textFieldUpdateBinding; @Override public void resultChanged(LookupEvent le) { if (bindingGroup != null && textFieldUpdateBinding != null) { bindingGroup.getBinding("textFieldUpdateBinding").unbind(); } if (bindingGroup != null && nodeUpdateBinding != null) { bindingGroup.getBinding("nodeUpdateBinding").unbind(); } if (!result.allInstances().isEmpty()) { Node n = result.allInstances().iterator().next(); Customer c = n.getLookup().lookup(Customer.class); ic.set(Collections.singleton(n), null); bindingGroup = new BindingGroup(); nodeUpdateBinding = Bindings.createAutoBinding( AutoBinding.UpdateStrategy.READ_WRITE, n, BeanProperty.create("name"), jTextField1, BeanProperty.create("text"), "nodeUpdateBinding"); bindingGroup.addBinding(nodeUpdateBinding); textFieldUpdateBinding = Bindings.createAutoBinding( AutoBinding.UpdateStrategy.READ_WRITE, c, BeanProperty.create("name"), jTextField1, BeanProperty.create("text"), "textFieldUpdateBinding"); bindingGroup.addBinding(textFieldUpdateBinding); bindingGroup.bind(); } } Now my node has no property change listener, while the customer has no property change support. As in the first bit of code, the text field doesn't have a listener either. All that listening is taken care of by the BeansBinding code.  Thanks to Toni for help with this, though he can't be blamed for anything that is wrong with it, only thanked for anything that is right with it. 

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  • Series On Embedded Development (Part 1)

    - by user12612705
    This is the first in a series of entries on developing applications for the embedded environment. Most of this information is relevant to any type of embedded development (and even for desktop and server too), not just Java. This information is based on a talk Hinkmond Wong and I gave at JavaOne 2012 entitled Reducing Dynamic Memory in Java Embedded Applications. One thing to remember when developing embeddded applications is that memory matters. Yes, memory matters in desktop and server environments as well, but there's just plain less of it in embedded devices. So I'm going to be talking about saving this precious resource as well as another precious resource, CPU cycles...and a bit about power too. CPU matters too, and again, in embedded devices, there's just plain less of it. What you'll find, no surprise, is that there's a trade-off between performance and memory. To get better performance, you need to use more memory, and to save more memory, you need to need to use more CPU cycles. I'll be discussing three Memory Reduction Categories: - Optionality, both build-time and runtime. Optionality is about providing options so you can get rid of the stuff you don't need and include the stuff you do need. - Tunability, which is about providing options so you can tune your application by trading performance for size, and vice-versa. - Efficiency, which is about balancing size savings with performance.

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  • JSR Updates and EC Nominations open

    - by heathervc
    JSR 310, Date and Time API, has published an Early Draft Review 2.  This review closes 14 October. JSR 353, Java API for JSON Processing, has published an Early Draft Review.  This review closes 7 October. JSR 356, Java API for WebSocket, has published an Early Draft Review. This review closes 27 October. JSR 339,  JAX-RS 2.0: The Java API for RESTful Web Services, has published a Public Review. This review closes 12 November. The EC Nominations are now open until 11 October.  Any JCP Member may nominate themselves for the 2 open seats in the 2012 EC Elections.  Note that both seats will be for a 1 year term only, since all EC Members will stand for Election in 2013.  The merged EC will take effect in November 2012.

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  • Learn about the Exciting New WebCenter Content 11.1.1.8 Features by Attending the Advisor Webcast on November 21st!

    - by AlanBoucher
    Have you been looking for a place to store your content securely and in an organized fashion, while needing to access it while you are on the go? Well you can!  Learn about the new Mobile App for WebCenter Content 11.1.1.8 along with other exciting new features by attending the Advisor Webcast called WebCenter Content 11.1.1.8 Overview and Support Information. November 21, 2013 at 11 am ET, 10 am CT, 9 am MT, 8 am PT, 5:00 pm, Europe Time (Paris, GMT+01:00) This one-hour session is recommended for technical and functional users who have installed or will install WebCenter Content 11.1.1.8 or would just like more information on the latest release. TOPICS WILL INCLUDE: Overview of new features and enhancements Installation of the new Content UI Upgrading from older WebCenter Content versions Support issues including latest patches Roadmap of proposed additional features REGISTER NOW and mark your Calendar:1. Event address for attendees: https://oracleaw.webex.com/oracleaw/onstage/g.php?d=590991341&t=a2. Register for the meeting.Once the host approves your request, you will receive a confirmation email with instructions for joining the meeting.

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  • Less known Solaris features: pwait

    - by user13366125
    This is a nifty small tool that i'm using quite often in scripts that stop something and do some tasks afterwards and i don't want to hassle around with the contract file system. It's not a cool feature, but it's useful and relatively less known. An example: As i wrote long ago, you should never use kill -9 because often the normal kill is intercepted by the application and it starts to do some clean up tasks first before really stopping the process. So just because kill has returned, it doesn't imply that the process is away. How do you wait for process to disappear? (more)

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  • Spécial Rétrospective 2010 sur Développez : quels événements IT vous ont le plus marqué cette année ?

    Spécial Rétro 2010 Quels événements IT vous ont le plus marqué cette année ? En collaboration avec Idelways Cloud computing, mobiles, réseaux sociaux, HTML5, Wikileaks... l'année 2010 touche à sa fin et force est de constater qu'elle fut riche en rebondissements dans le domaine du développement et dans l'IT d'une manière générale. Cette année a tout particulièrement été marquée par le retour fracassant d'Oracle sur le devant de la scène médiatique. Rachats, poursuites judiciaires, forks, déclarations assassines, abandons et lancement de produits... bref, Oracle était partout en 2010. Tout a vraiment commencé après la

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  • What's New in JMS 2 - Part 1

    - by reza_rahman
    JMS 2 is one of the most significant parts of Java EE 7. One of the principal goals of the JMS 2 API is improving developer productivity by reducing the amount of code to work with JMS by adopting programming paradigms like higher level abstractions, dependency injection, annotations, runtime exceptions, the builder pattern and intelligent defaults. In a recent OTN article, JMS 2 specification lead Nigel Deakin covers the ease-of-use changes in detail. The article is the first of a two part series on JMS 2. For more visual folks, there is my JMS 2 slide deck: What’s New in Java Message Service 2 from Reza Rahman 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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  • 2012 EC Election Results

    - by heathervc
    The 2012 Fall Executive Committee Election process is now complete. The ballot closed at midnight pacific time on Monday, 29 October.  Congratulations to Cinterion Wireless Modules GmbH, Credit Suisse, Fujitsu Limited, Hewlett-Packard (all four candidates were ratified),  and CloudBees and London Java Community (two elected candidates) as the new and re-elected merged EC Members. For more information regarding the merged EC, please refer to JSR 355 and the JCP 2.9 Process Document. Ratified Seats: Cinterion Wireless Modules GmbH, Credit Suisse, Fujitsu Limited and Hewlett-Packard Open Election Seats: CloudBees and London Java Community Newly elected EC Members take their seats on Tuesday, 13 November 2012. Detailed Election Results:Number of Eligible Voters: 1131 Percent of Eligible Members Casting Votes: 23.70% Ratified Seats: Candidate Yes Votes (%) No Votes (%) Abstentions Cinterion Wireless Modules GmbH 156 (76) 48 (24) 64 Credit Suisse 205 (85) 35 (15) 28 Fujitsu Limited 195 (85) 35 (15) 38 Hewlett-Packard 182 (81) 44 (19) 42 Open Election Seats: The top two candidates have been elected. Candidate Votes (%) Cisco Systems 37 (7) CloudBees 101 (20) Giuseppe Dell'Abate 6 (1) Liferay, Inc. 35 (7) London Java Community 164 (33) MoroccoJUG 46 (9) North Sixty-One Ltd 26 (5) Software AG 19 (4) ZeroTurnaround 64 (13) None of the above 5 (1) For more information about the candidates who ran for the 2012 Executive Committee Election, please visit the 2012 Executive Committee Elections Nominees page.

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