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  • New on the Java Channel: Low-Latency Applications, JavaFX on Raspberry PI, and more

    - by terrencebarr
    If you haven’t checked out the Java YouTube channel lately … here is some of the stuff you’re missing: Understanding the JVM and Low Latency Applications (picture) JavaFX on the Raspberry Pi 55 New Java 7 Features: Part 3 – Concurrency Properties and Binding with JavaFX 2 Intro And something fun & cool: Java @ Maker Faire 2012 Much more on the Java Channel. Enjoy! Cheers, – Terrence Filed under: Mobile & Embedded Tagged: Embedded Java, Java 7, Java Channel, Java Embedded, JavaFX, Maker Faire, Raspberry Pi, video, webcast, YouTube

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  • New for Your Ears: The Java Spotlight on Embedded Java, JavaFX, Java on Mac, and more

    - by terrencebarr
    Just to let you know there are a bunch of new and interesting podcasts around embedded Java, JavaFX, and Java on Mac OS X available on The Java Spotlight Podcast: Episode 89: Geoff Morton on Java Embedded Episode 88: HTML5 and JavaFX 2 with Gerrit Grunwald Episode 87: Nandini Ramani on JavaFX and Embedded Java Episode 83: Scott Kovatch on Java for Mac OS X Enjoy! Cheers, – Terrence Filed under: Mobile & Embedded Tagged: Embedded Java, JavaFX, Mac OS X, The Java Spotlight Podcast

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  • Mobile Java, shiny and new: Nokia Asha and Nokia SDK 2.0

    - by terrencebarr
    Nokia has announced a series of new S40 phones called “Asha” – mass-market devices with smart-phone features: Good-sized touch screens, 1 GHz processors, WiFi connectivity, social networking integration, and more. Prices starting around €60 retail. In case you don’t know, the S40 series is built on Java ME and has a huge deployed base in many parts of the world where price/performance is critical. Along with the new phones, Nokia is also making available the new Nokia SDK 2.0 for Java (beta), which enables developers to build rich Java applications with multi-touch, sensor support, an improved Maps API, and the Lightweight UI Toolkit (LWUIT) (more API & tools details). Furthermore, there is a host of developer information, the remote device access service, and even a porting guide to help you port your Android app to the new Asha platform. Last, but not least: More and better options to monetize your applications. Nokia has enabled in-app advertising and in-app purchasing, and improved the way applications can be discovered by customers. Nokia has seen downloads from the Nokia app store rise by 63%, now totaling billions. From what I’m hearing, the revenue opportunities on S40 for developers are often way better than what is typical for other smart-phone platforms (where competition is huge and consumers are fickle). Cheers, – Terrence Filed under: Mobile & Embedded Tagged: Asha Series, Java ME, Java ME SDK, Mobile Java, monetization, Nokia, S40

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  • Open the LOV of af:inputListOfValues with a double click

    - by frank.nimphius
    To open the LOV popup of an af:inputListOfValues component in ADF Faces, you either click the magnifier icon to the right of the input field or tab onto the icon and press the Enter key. If you want to open the same dialog in response to a user double click into the LOV input field, JavaScript is a friend. For this solution, I assume you created an editable table or input form that is based on a View Object that contains at least one attribute that has a model driven list of values defined. The Default List Type is should be set to Input Text with List of Values so that when the form or table gets created, the attribute is rendered by the af:inputListOfValues component. To implement the use case, drag a Client Listener component from the Operations accordion in the Component Palette and drop it onto the af:inputListOfValues component in the page. In the opened Insert Client Listener dialog, define the Method as handleLovOnDblclickand choose dblClick in the select list for the Type attribute. Add the following code snippet to the page source directly below the af:document tag. <af:document id="d1">      <af:resource type="javascript">     function handleLovOnDblclick(evt){             var lovComp = evt.getSource();             if (lovComp instanceof AdfRichInputListOfValues &&          lovComp.getReadOnly()==false){           AdfLaunchPopupEvent.queue(lovComp,true);        }     }      </af:resource> The JavaScript function is called whenever the user clicks into the LOV field. It gets the source component reference from the event object that is passed into the function and verifies the LOV component is not read only. It then queues the launch event for the LOV popup to open. The page source for the LOV component is shown below: <af:inputListOfValues id="departmentIdId" … >   <f:validator binding="…"/>   …  <af:clientListener method="handleLovOnDblclick" type="dblClick"/> </af:inputListOfValues>

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  • Fast Fashion Freshness

    - by David Dorf
    Fashion retailers such as H&M, Zara, and Wet Seal have perfected the fast fashion retailing model. The concept requires no replenishment in order to maintain assortment freshness and to create a sense of urgency for the consumer to purchase now. However, maintaining assortment freshness results in high product turnover, making markdown optimization a necessity. Wet Seal, for instance, needed to move from ad-hoc markdowns and dealing with surplus inventory to handling markdowns methodically across 8,000 SKUs with only 12-15 week lifecycle (from DC receipt to exit). By optimizing and automating markdowns, Wet Seal is reaching their goal of assortment freshness, which in turn increases sales. If you're interested in learning more, register for a free webinar occurring on May 13th featuring Join Daniel Ryu, Vice President of Planning and Allocation at Wet Seal. He'll be discussing how the fast fashion retailer maintains their goal of assortment freshness.

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  • New Rules of Retail

    - by David Dorf
    I've been on vacation and preparing for Crosstalk, so its been a while since I've posted. I've seen the agenda, and I can assure you Crosstalk will be lots of fun. In addition to hearing from lots of retailers, we'll also be doing a little bowling and racing on the track. I'll be around for the sessions, the ORUG meetings, and our Customer Advisory Board so please be sure to say hello. I also just completed a white paper based on a previous blog posting which in turn was based on learnings from reading What Would Google Do? For each of Jarvis' ten rules, I discuss the concept in the context of retail and provide real-world examples. No mention of products or sales pitches at all. You can download the paper here. It will put you in the right frame of mind for hearing Jeff Jarvis speak at Crosstalk. For those that can't make it, I'll post some highlights afterwards.

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  • Közkívánatra VB tippjáték újra

    - by Lajos Sárecz
    Dimitri Gielis kiváló APEX fejleszto újra beindította APEX alapon készült népszeru online tippjátékát, így már lehet fogadni az idei foci VB mérkozéseire! 4 éve indult a rendszer, mi kollégákkal rendszeresen meg szoktunk mérkozni ennek keretében. Jó szurkolást, és izgalmas tippjátékot mindenkinek. Ja, és APEX forever! :-)

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  • EU Research for ICT - Call 7 - biggest ever at € 780 million

    - by trond-arne.undheim
    Under the Digital Agenda for Europe, the Commission has committed to maintaining the pace of a 20% yearly increase of the annual ICT R&D budget at least until 2013. The EU's flagship policy programme calls for doubling of annual public spending on ICT R&D by 2020 and to leverage an equivalent increase in private spending to achieve the goals of Europe's 2020 strategy for jobs and growth. Call 7 is one of the biggest calls ever launched for information and communications technology (ICT) research proposals under the EU's research framework programmes. It will result in project funding of € 780 million in 2011. This funding will advance research on the future internet, robotics, smart and embedded systems, photonics, ICT for energy efficiency, health and well-being in an ageing society, and more. The €780 million call for proposals is part of the biggest ever annual Work Programme under the EU's 7th Framework Programme for Research. Almost €1.2 billion has been budgeted for 2011. €220 million were made available already in July 2010 for public private partnerships focusing on ICT for smart cars, green buildings, sustainable factories and the future internet. Universities, research centres, SMEs, large companies and other organisations in Europe and beyond are eligible to apply for project funding under ICT Call 7. Proposals can be submitted until 18 January 2011, after which they will be evaluated by independent panels of experts for selection on the basis of their quality. Background: Digital Agenda: European Commission announces €780 million boost for strategic ICT research. Call text: ICT Call 7 Deadline: 18/01/2011.

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  • OBIEE 11.1.1 - Disable Wrap Data Types in WebLogic Server 10.3.x

    - by Ahmed Awan
    By default, JDBC data type’s objects are wrapped with a WebLogic wrapper. This allows for features like debugging output and track connection usage to be done by the server. The wrapping can be turned off by setting this value to false. This improves performance, in some cases significantly, and allows for the application to use the native driver objects directly. Tip: How to Disable Wrapping in WLS Administration Console You can use the Administration Console to disable data type wrapping for following JDBC data sources in bifoundation_domain domain: Data Source Name bip_datasource mds-owsm EPMSystemRegistry   To disable wrapping for each JDBC data source (as stated in above table): 1.     If you have not already done so, in the Change Center of the Administration Console, click Lock & Edit. 2.     In the Domain Structure tree, expand Services, then select Data Sources. 3.     On the Summary of Data Sources page, click the data source name for example “mds-owsm”. 4.     Select the Configuration: Connection Pool tab. 5.     Scroll down and click Advanced to show the advanced connection pool options. 6.     In Wrap Data Types, deselect the checkbox to disable wrapping. 7.     Click Save. 8.     To activate these changes, in the Change Center of the Administration Console, click Activate Changes. Important Note: This change does not take effect immediately—it requires the server be restarted.

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  • Skinning af:selectOneChoice

    - by Duncan Mills
    A question came in today about how to skin the selection button ()  of an <af:selectOneChoice>. If you have a delve in the ADF Skinning editor, you'll find that there are selectors for the selectOneChoice when in compact mode (af|selectOneChoice::compact-dropdown-icon-style), however, there is not a selector for the icon in the "normal" mode. I had a quick delve into the skinning source files that you can find in the adf-richclient-impl-11.jar and likewise there seemed to be no association there. However, a quick sample page and a peek with Chrome developer tools revealed the problem.  The af:selectOneChoice gets rendered in the browser as a good old <select> element (reasonable enough!). Herein lies the problem, and the reason why there is no skin selector. The <select> HTML element does not have a standard way of replacing the image used for the dropdown button.  If you have a search around with your favorite search engine, you can find various workarounds and solutions for this.  For example, using Chrome and Safari you can define the following for the select element: select {   -webkit-appearance: listbox;   background-image: url(blob.png);    background-position: center right;   background-repeat: no-repeat;   } Which gives a very exciting select box:  .

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  • WebLogic Scripting Tool Tip &ndash; relax the syntax with the easy button

    - by james.bayer
    I stumbled on to this feature in WLST tonight called easeSyntax.  Apparently it’s a hidden feature that one of the WebLogic support engineers blogged about that allows you to simplify the commands in the interactive mode to have fewer parentheses and quotes.  For example, see how some of the commands instead of typing “ls()” I can type '”ls” or “cd(“/somepath”)” can become “cd /somepath”.  It’s not going to save the world, but it will help cut down on some extra typing. The example I was researching when stumbling into this was for how to print the runtime status of deployed application named “hello” on the “AdminServer”.  See the below output. wls:/base_domain/domainConfig> easeSyntax()   You have chosen to ease syntax for some WLST commands. However, the easy syntax should be strictly used in interactive mode. Easy syntax will not function properly in script mode and when used in loops. You can still use the regular jython syntax although you have opted for easy syntax. Use easeSyntax to turn this off. Use help(easeSyntax) for commands that support easy syntax wls:/base_domain/domainConfig> domainRuntime   wls:/base_domain/domainRuntime> ls dr-- AppRuntimeStateRuntime dr-- CoherenceServerLifeCycleRuntimes dr-- ConsoleRuntime dr-- DeployerRuntime dr-- DeploymentManager dr-- DomainServices dr-- LogRuntime dr-- MessageDrivenControlEJBRuntime dr-- MigratableServiceCoordinatorRuntime dr-- MigrationDataRuntimes dr-- PolicySubjectManagerRuntime dr-- SNMPAgentRuntime dr-- ServerLifeCycleRuntimes dr-- ServerRuntimes dr-- ServerServices dr-- ServiceMigrationDataRuntimes   -r-- ActivationTime Wed Dec 15 22:37:02 PST 2010 -r-- MessageDrivenControlEJBRuntime null -r-- MigrationDataRuntimes null -r-- Name base_domain -rw- Parent null -r-- ServiceMigrationDataRuntimes null -r-- Type DomainRuntime   -r-x preDeregister Void : -r-x restartSystemResource Void : WebLogicMBean(weblogic.management.configuration.SystemResourceMBean)   wls:/base_domain/domainRuntime> cd AppRuntimeStateRuntime/AppRuntimeStateRuntime wls:/base_domain/domainRuntime/AppRuntimeStateRuntime/AppRuntimeStateRuntime> ls   -r-- ApplicationIds java.lang.String[active-cache#[email protected], coherence-web-spi#[email protected], coherence#3. -r-- Name AppRuntimeStateRuntime -r-- Type AppRuntimeStateRuntime   -r-x getCurrentState String : String(appid),String(moduleid),String(subModuleId),String(target) -r-x getCurrentState String : String(appid),String(moduleid),String(target) -r-x getCurrentState String : String(appid),String(target) -r-x getIntendedState String : String(appid) -r-x getIntendedState String : String(appid),String(target) -r-x getModuleIds String[] : String(appid) -r-x getModuleTargets String[] : String(appid),String(moduleid) -r-x getModuleTargets String[] : String(appid),String(moduleid),String(subModuleId) -r-x getModuleType String : String(appid),String(moduleid) -r-x getRetireTimeMillis Long : String(appid) -r-x getRetireTimeoutSeconds Integer : String(appid) -r-x getSubmoduleIds String[] : String(appid),String(moduleid) -r-x isActiveVersion Boolean : String(appid) -r-x isAdminMode Boolean : String(appid),String(java.lang.String) -r-x preDeregister Void :   wls:/base_domain/domainRuntime/AppRuntimeStateRuntime/AppRuntimeStateRuntime> cmo.getCurrentState('hello','AdminServer') 'STATE_ACTIVE' wls:/base_domain/domainRuntime/AppRuntimeStateRuntime/AppRuntimeStateRuntime> cd / wls:/base_domain/domainRuntime>

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  • ATG Live Webcast Feb. 24th: Using the EBS 12 SOA Adapter

    - by Bill Sawyer
    Our next ATG Live Webcast is now open for registration. The event is titled:E-Business Suite R12.x SOA Using the E-Business Suite AdapterThis live one-hour webcast will offer a review of the Service Oriented Architecture (SOA) capabilities within E-Business Suite R12 focusing on the E-Business Suite Adapter. While primarily focused on integrators and developers, understanding SOA capabilities is important for all E-Business Suite technologists and superusers.ATG Live Webcast Logistics The one-hour event will be webcast live with a dial-in access for Q&A with the Applications Technology Group (ATG) Development experts presenting the event. The basic information for the event is as follows:E-Business Suite R12.x SOA Using the E-Business Suite AdapterDate: Thursday, February 24, 2011Time: 8:00 AM - 9:00 AM Pacific Standard TimePresenters:  Neeraj Chauhan, Product Manager, ATG DevelopmentNOTE: When you register for the event, the confirmation will show the event starting at 7:30 AM Pacific Standard Time. This is to allow you time to connect to the conference call and web conference. The presentation will start at 8:00 AM Pacfic Standard Time.

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  • Dr. Robert Ballard: Special Guest at Java Strategy Keynote Sunday

    - by Tori Wieldt
    Dr. Robert Ballard, famed explorer who found the Titanic at its final resting place, will be at the Java Strategy Keynote on Sunday. Among the most accomplished and well known of the world's deep-sea explorers, Dr. Ballard is best known for his historic discoveries of hydrothermal vents, the sunken R.M.S. Titanic, the German battleship Bismarck, and numerous other contemporary and ancient shipwrecks around the world. During his long career he has conducted more than 120 deep-sea expeditions using the latest in exploration technology, and he is a pioneer in the early use of deep-diving submarines. You can learn more about Dr. Ballard and undersea exploration at National Geographic and TED. The first 1,000 people to arrive at the JavaOne Keynote hall on Sunday will receive a copy of Dr. Ballard's TV show "The Alien Deep" on Blu-Ray. The Alien Deep explores the sea, thousands of feet beneath the surface, far from the first crack of light, where the planet’s last and greatest secrets hide in the cold darkness of endless night. Viewers get to see underwater worlds via submersible where no one has gone before. The JavaOne Strategy Keynote is on Sunday at 4:00pm PT at Masonic Auditorium, 1111 California Street. See you there!

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  • Resuming blogging activities and a maths question

    - by ali.mukadam
    Resuming my blogging activities and unlike Dumbledore, I do not have a pensieve to review my thoughts and put them in order. On the other hand, thinking of maths problems somehow seem to make them clearer. So before I start writing long-winding blog posts, here's one I was given 16 years ago: The length of a rectangle is 6 cm smaller than its width. If the area of the rectangle is 16, what is its perimeter? Hint: Solvable in 5 lines or less. Cheers, Ali

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  • setCurrentRowWithKey and setCurrentRowWithKeyValue

    - by raghu.yadav
    Good demo demo by shay by shay on how to use setCurrentRowWithKeyValue to synchronize the master and details of same table. Example : Employee master table list and EmployeeDetail form to edit records. However there are many ways to achieve the same usecase. You can use the clicktoEdit property on table row to edit records in place within in table and there is also a feature to show more for few columns in table tools. But objective here is to see how and where and all we can make use of setCurrentRowWithKey and setCurrentRowWithKeyValue. Here is the link about this explains how we can make use of this. link more to be added.

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  • Post-Purchase Social Media

    - by David Dorf
    When you make a particularly good purchase, the natural tendency is to share the experience with friends. You show them your cool new toy or garment, then explain how you discovered such a great deal, all the while implying you are the world's most savvy shopper. My wife does it with clothes, housewares, and books, and I do it with wiz-bang techie stuff. Post-purchase euphoria or Buyer's remorse are associated with most purchases beyond day-to-day needs. So now let's add social media to the mix. Haul videos are a YouTube phenomenon where a shopper describes their latest haul on video. Blair Fowler, aka juicystar07, is an excellent example. She and her older sister's haul videos have been viewed 75,000,000 times, at times causing particular items to sell out after being showcased. If you're not already on this bandwagon, checkout Blair's haul video from her trip to Forever21. There are a couple good articles on this trend from ABC's GMA, Slate, and NPR. Some retailers are already sending free products to these fashionistas in the hopes they'll be reviewed on camera. For those less willing to exert themselves, there's Blippy, a service that automatically tweets your purchases. Similar to Twitter, your purchases are tweeted so your friends can see what you've purchased and your network can make comments. In the example to the right, co-founder Philip Kaplan purchased a gift for his wife from the store Does Your Mother Know, proving the point that the need for privacy is overblown. Blippy has partnerships with selected merchants like Apple, Amazon, and Netflix and can also get purchases from the credit cards you've registered. When you register, you can configure whether to automatically tweet each purchase, or approve them first. No sense in broadcasting my need for Rogaine, right? This is a good thing for retailers, as it helps spread the word about purchases and gives other people ideas. Rick just bought an ooma from Amazon. What the heck is ooma? Oh, its like Vonage but no monthly bills. I'm there.

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  • QotD: Alex Buckley announcing Java™ SE 8 Early Access Builds with Type Annotation Support

    - by $utils.escapeXML($entry.author)
    I am pleased to announce that binary builds of the JSR 308 Reference Implementation are available at http://jdk8.java.net/type-annotations/.Please see the Type Annotations project page for a link to the JSR 308 Specification. There is also a changelog, which is important to review as there have been significant spec changes in 2012.The builds were generated from the type-annotations/type-annotations forest on 9/9. This forest is regularly updated from jdk8/jdk8 and jdk8/tl.Alex Buckley in a post on the type-annotations-dev mailing list.If you want to play with repeating annotations, check out http://jdk8.java.net/type-annotations/ ... thanks to superior code wrangling by Joel Franck (repeating annotations) and Werner Dietl (type annotations), support for repeating annotations on declarations is included in the build.Alex Buckley in a post on the enhanced-metadata-spec-discuss mailing list.

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  • Error : Member 'D-T-D' in the Period dimension has no value for the Period Type property

    - by RahulS
    Workaround for LCM EPMA deploy errors: Error : Member 'D-T-D' in the Period dimension has no value for the Period  Type property.  Error : Member name 'D-T-D' in the Period dimension is only valid when Period  Type is set to 'DTS Time Period'.  Error : Member 'W-T-D' in the Period dimension has no value for the Period  Type property.  Error : Member name 'W-T-D' in the Period dimension is only valid when Period  Type is set to 'DTS Time Period'.  Error : Member 'M-T-D' in the Period dimension has no value for the Period  Type property.  Error : Member name 'M-T-D' in the Period dimension is only valid when Period  Type is set to 'DTS Time Period'.  Error : Member 'Q-T-D' in the Period dimension has no value for the Period  Type property.  Error : Member name 'Q-T-D' in the Period dimension is only valid when Period  Type is set to 'DTS Time Period'.  Error : Member 'P-T-D' in the Period dimension has no value for the Period  Type property.  Error : Member name 'P-T-D' in the Period dimension is only valid when Period  Type is set to 'DTS Time Period'.  Error : Member 'S-T-D' in the Period dimension has no value for the Period  Type property.  Error : Member name 'S-T-D' in the Period dimension is only valid when Period  Type is set to 'DTS Time Period'.  Error : Member 'Y-T-D' in the Period dimension has no value for the Period  Type property.  Error : Member name 'Y-T-D' in the Period dimension is only valid when Period  Type is set to 'DTS Time Period'.  Error : Member 'H-T-D' in the Period dimension has no value for the Period  Type property.  Error : Member name 'H-T-D' in the Period dimension is only valid when Period  Type is set to 'DTS Time Period'. Fix 1. Edit the Period dimension LCM artifact (Keep the back up of the file before editing.)  2. Delete the DTS members (for example as mentioned below) in the Period dimension hierarchy section.   #root|D-T-D|True||||||||||||||||   #root|W-T-D|True||||||||||||||||   #root|M-T-D|True||||||||||||||||   #root|Q-T-D|True||||||||||||||||   #root|P-T-D|True||||||||||||||||   #root|S-T-D|True||||||||||||||||   #root|Y-T-D|True||||||||||||||||   #root|H-T-D|True||||||||||||||||   3. Delete the DTS members (for example as mentioned below) in the Period member hierarchy section,   D-T-D|True||||||||||||||||   W-T-D|True||||||||||||||||   M-T-D|True||||||||||||||||   Q-T-D|True||||||||||||||||   P-T-D|True||||||||||||||||   S-T-D|True||||||||||||||||   Y-T-D|True||||||||||||||||   H-T-D|True||||||||||||||||   4. Then save the edited Period dimension LCM artifact.   5. Then try to import the Period dimension using LCM.   6. Then Validate/Deploy the Planning application still the same issue. PS: This issue is fixed in 11.1.2.2.

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  • The Disloyalty Card

    - by David Dorf
    Let's take a break from technology for a second; please indulge me. (That's for you Erick.) A few months back, James Hoffmann reported that Gwilym Davies, the 2009 World Barista Champion, had implemented a rather unique idea for his cafe: the disloyalty card. His card lists eight nearby cafes in London that the cardholder must visit and try a coffee. After sampling all eight and collecting the required stamps, Gwilym provides a free coffee from his shop. His idea sends customers to his competitors. What does this say about Gwilym? First, it tells me he's confident in his abilities to make a mean cup of java. Second, it tells me he's truly passionate about his his trade. But was this a sound business endeavor? Obviously the risk is that one of his loyal customers might just find a better product at a competitor and not return. But the goal isn't really to strengthen his customer base -- its to strengthen the market, which will in turn provide more customers over the long run. This idea seems great for frequently purchased products like restaurants, bars, bakeries, music, and of course, cafes. Its probably not a good idea for high priced merchandise or infrequently purchased items like shoes, electronics, and housewares. Nevertheless, its a great example of thinking in reverse. Try this: Instead of telling your staff how you want customers treated, list out the ways you don't want customers treated. Why should you limit people's imagination and freedom to engage customers? Instead, give them guidelines to avoid the bad behavior, and leave them open to be creative with the positive behavior. Instead of asking the question, "how can we get more people in our stores?" try asking the inverse: "why aren't people visiting our stores?" Innovation doesn't only come from asking "why?" Often it comes from asking "why not?"

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  • Logging WebSocket Frames using Chrome Developer Tools, Net-internals and Wireshark (TOTD #184)

    - by arungupta
    TOTD #183 explained how to build a WebSocket-driven application using GlassFish 4. This Tip Of The Day (TOTD) will explain how do view/debug on-the-wire messages, or frames as they are called in WebSocket parlance, over this upgraded connection. This blog will use the application built in TOTD #183. First of all, make sure you are using a browser that supports WebSocket. If you recall from TOTD #183 then WebSocket is combination of Protocol and JavaScript API. A browser supporting WebSocket, or not, means they understand your web pages with the WebSocket JavaScript. caniuse.com/websockets provide a current status of WebSocket support in different browsers. Most of the major browsers such as Chrome, Firefox, Safari already support WebSocket for the past few versions. As of this writing, IE still does not support WebSocket however its planned for a future release. Viewing WebSocket farmes require special settings because all the communication happens over an upgraded HTTP connection over a single TCP connection. If you are building your application using Java, then there are two common ways to debug WebSocket messages today. Other language libraries provide different mechanisms to log the messages. Lets get started! Chrome Developer Tools provide information about the initial handshake only. This can be viewed in the Network tab and selecting the endpoint hosting the WebSocket endpoint. You can also click on "WebSockets" on the bottom-right to show only the WebSocket endpoints. Click on "Frames" in the right panel to view the actual frames being exchanged between the client and server. The frames are not refreshed when new messages are sent or received. You need to refresh the panel by clicking on the endpoint again. To see more detailed information about the WebSocket frames, you need to type "chrome://net-internals" in a new tab. Click on "Sockets" in the left navigation bar and then on "View live sockets" to see the page. Select the box with the address to your WebSocket endpoint and see some basic information about connection and bytes exchanged between the client and the endpoint. Clicking on the blue text "source dependency ..." shows more details about the handshake. If you are interested in viewing the exact payload of WebSocket messages then you need a network sniffer. These tools are used to snoop network traffic and provide a lot more details about the raw messages exchanged over the network. However because they provide lot more information so they need to be configured in order to view the relevant information. Wireshark (nee Ethereal) is a pretty standard tool for sniffing network traffic and will be used here. For this blog purpose, we'll assume that the WebSocket endpoint is hosted on the local machine. These tools do allow to sniff traffic across the network though. Wireshark is quite a comprehensive tool and we'll capture traffic on the loopback address. Start wireshark, select "loopback" and click on "Start". By default, all traffic information on the loopback address is displayed. That includes tons of TCP protocol messages, applications running on your local machines (like GlassFish or Dropbox on mine), and many others. Specify "http" as the filter in the top-left. Invoke the application built in TOTD #183 and click on "Say Hello" button once. The output in wireshark looks like Here is a description of the messages exchanged: Message #4: Initial HTTP request of the JSP page Message #6: Response returning the JSP page Message #16: HTTP Upgrade request Message #18: Upgrade request accepted Message #20: Request favicon Message #22: Responding with favicon not found Message #24: Browser making a WebSocket request to the endpoint Message #26: WebSocket endpoint responding back You can also use Fiddler to debug your WebSocket messages. How are you viewing your WebSocket messages ? Here are some references for you: JSR 356: Java API for WebSocket - Specification (Early Draft) and Implementation (already integrated in GlassFish 4 promoted builds) TOTD #183 - Getting Started with WebSocket in GlassFish Subsequent blogs will discuss the following topics (not necessary in that order) ... Binary data as payload Custom payloads using encoder/decoder Error handling Interface-driven WebSocket endpoint Java client API Client and Server configuration Security Subprotocols Extensions Other topics from the API

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  • Handling EJB/JPA exceptions in a “beautiful” way

    - by Rodrigues, Raphael
    In order to handle JPA exceptions, there are some ways already detailed in lots of blogs. Here, I intend to show one of them, which I consider kind of “beauty”. My use case has a unique constraint, when the User try to create a duplicate value in database. The JPA throws a java.sql.SQLIntegrityConstraintViolationException, and I have to catch it and replace the message. In fact, ADF Business Components framework already has a beautiful solution for this very well documented here . However, for EJB/JPA there's no similar approach. In my case, what I had to do was: 1. Create a custom Error Handler Class in DataBindings file; a. Here is how you accomplish it. 2. Override the reportException method and check if the type of exception exists on property file a. If yes, I change the message and rethrows the exception b. If not, go on the execution The main goal of this approach is whether a new or unhandled Exception was raised, the job is, only create a single entry in bundle property file. Here are pictures step by step: 1. CustomExceptionHandler.java 2. Databindings.cpx 3. Bundle file 4. jspx: 5. Stacktrace: Give your opinion, what did you think about that?

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  • Tom Kyte nem tud jönni az izlandi hamufelho miatt

    - by Lajos Sárecz
    Sajnos Tom Kyte jövo heti budapesti programját törölni kell az izlandi hamufelho miatt. Kollégáim mindent elkövettek, hogy találjanak megoldást, de ma estére kiderült, hogy a helyzet pillanatnyilag megoldhatatlan. Dolgozunk azon a lehetoségen, hogy Tom a közeljövoben mégis el tudjon jönni Magyarországra megtartani a szemináriumot.

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  • WebSocket and Java EE 7 - Getting Ready for JSR 356 (TOTD #181)

    - by arungupta
    WebSocket is developed as part of HTML 5 specification and provides a bi-directional, full-duplex communication channel over a single TCP socket. It provides dramatic improvement over the traditional approaches of Polling, Long-Polling, and Streaming for two-way communication. There is no latency from establishing new TCP connections for each HTTP message. There is a WebSocket API and the WebSocket Protocol. The Protocol defines "handshake" and "framing". The handshake defines how a normal HTTP connection can be upgraded to a WebSocket connection. The framing defines wire format of the message. The design philosophy is to keep the framing minimum to avoid the overhead. Both text and binary data can be sent using the API. WebSocket may look like a competing technology to Server-Sent Events (SSE), but they are not. Here are the key differences: WebSocket can send and receive data from a client. A typical example of WebSocket is a two-player game or a chat application. Server-Sent Events can only push data data to the client. A typical example of SSE is stock ticker or news feed. With SSE, XMLHttpRequest can be used to send data to the server. For server-only updates, WebSockets has an extra overhead and programming can be unecessarily complex. SSE provides a simple and easy-to-use model that is much better suited. SSEs are sent over traditional HTTP and so no modification is required on the server-side. WebSocket require servers that understand the protocol. SSE have several features that are missing from WebSocket such as automatic reconnection, event IDs, and the ability to send arbitrary events. The client automatically tries to reconnect if the connection is closed. The default wait before trying to reconnect is 3 seconds and can be configured by including "retry: XXXX\n" header where XXXX is the milliseconds to wait before trying to reconnect. Event stream can include a unique event identifier. This allows the server to determine which events need to be fired to each client in case the connection is dropped in between. The data can span multiple lines and can be of any text format as long as EventSource message handler can process it. WebSockets provide true real-time updates, SSE can be configured to provide close to real-time by setting appropriate timeouts. OK, so all excited about WebSocket ? Want to convert your POJOs into WebSockets endpoint ? websocket-sdk and GlassFish 4.0 is here to help! The complete source code shown in this project can be downloaded here. On the server-side, the WebSocket SDK converts a POJO into a WebSocket endpoint using simple annotations. Here is how a WebSocket endpoint will look like: @WebSocket(path="/echo")public class EchoBean { @WebSocketMessage public String echo(String message) { return message + " (from your server)"; }} In this code "@WebSocket" is a class-level annotation that declares a POJO to accept WebSocket messages. The path at which the messages are accepted is specified in this annotation. "@WebSocketMessage" indicates the Java method that is invoked when the endpoint receives a message. This method implementation echoes the received message concatenated with an additional string. The client-side HTML page looks like <div style="text-align: center;"> <form action=""> <input onclick="send_echo()" value="Press me" type="button"> <input id="textID" name="message" value="Hello WebSocket!" type="text"><br> </form></div><div id="output"></div> WebSocket allows a full-duplex communication. So the client, a browser in this case, can send a message to a server, a WebSocket endpoint in this case. And the server can send a message to the client at the same time. This is unlike HTTP which follows a "request" followed by a "response". In this code, the "send_echo" method in the JavaScript is invoked on the button click. There is also a <div> placeholder to display the response from the WebSocket endpoint. The JavaScript looks like: <script language="javascript" type="text/javascript"> var wsUri = "ws://localhost:8080/websockets/echo"; var websocket = new WebSocket(wsUri); websocket.onopen = function(evt) { onOpen(evt) }; websocket.onmessage = function(evt) { onMessage(evt) }; websocket.onerror = function(evt) { onError(evt) }; function init() { output = document.getElementById("output"); } function send_echo() { websocket.send(textID.value); writeToScreen("SENT: " + textID.value); } function onOpen(evt) { writeToScreen("CONNECTED"); } function onMessage(evt) { writeToScreen("RECEIVED: " + evt.data); } function onError(evt) { writeToScreen('<span style="color: red;">ERROR:</span> ' + evt.data); } function writeToScreen(message) { var pre = document.createElement("p"); pre.style.wordWrap = "break-word"; pre.innerHTML = message; output.appendChild(pre); } window.addEventListener("load", init, false);</script> In this code The URI to connect to on the server side is of the format ws://<HOST>:<PORT>/websockets/<PATH> "ws" is a new URI scheme introduced by the WebSocket protocol. <PATH> is the path on the endpoint where the WebSocket messages are accepted. In our case, it is ws://localhost:8080/websockets/echo WEBSOCKET_SDK-1 will ensure that context root is included in the URI as well. WebSocket is created as a global object so that the connection is created only once. This object establishes a connection with the given host, port and the path at which the endpoint is listening. The WebSocket API defines several callbacks that can be registered on specific events. The "onopen", "onmessage", and "onerror" callbacks are registered in this case. The callbacks print a message on the browser indicating which one is called and additionally also prints the data sent/received. On the button click, the WebSocket object is used to transmit text data to the endpoint. Binary data can be sent as one blob or using buffering. The HTTP request headers sent for the WebSocket call are: GET ws://localhost:8080/websockets/echo HTTP/1.1Origin: http://localhost:8080Connection: UpgradeSec-WebSocket-Extensions: x-webkit-deflate-frameHost: localhost:8080Sec-WebSocket-Key: mDbnYkAUi0b5Rnal9/cMvQ==Upgrade: websocketSec-WebSocket-Version: 13 And the response headers received are Connection:UpgradeSec-WebSocket-Accept:q4nmgFl/lEtU2ocyKZ64dtQvx10=Upgrade:websocket(Challenge Response):00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00 The headers are shown in Chrome as shown below: The complete source code shown in this project can be downloaded here. The builds from websocket-sdk are integrated in GlassFish 4.0 builds. Would you like to live on the bleeding edge ? Then follow the instructions below to check out the workspace and install the latest SDK: Check out the source code svn checkout https://svn.java.net/svn/websocket-sdk~source-code-repository Build and install the trunk in your local repository as: mvn install Copy "./bundles/websocket-osgi/target/websocket-osgi-0.3-SNAPSHOT.jar" to "glassfish3/glassfish/modules/websocket-osgi.jar" in your GlassFish 4 latest promoted build. Notice, you need to overwrite the JAR file. Anybody interested in building a cool application using WebSocket and get it running on GlassFish ? :-) This work will also feed into JSR 356 - Java API for WebSocket. On a lighter side, there seems to be less agreement on the name. Here are some of the options that are prevalent: WebSocket (W3C API, the URL is www.w3.org/TR/websockets though) Web Socket (HTML5 Demos - html5demos.com/web-socket) Websocket (Jenkins Plugin - wiki.jenkins-ci.org/display/JENKINS/Websocket%2BPlugin) WebSockets (Used by Mozilla - developer.mozilla.org/en/WebSockets, but use WebSocket as well) Web sockets (HTML5 Working Group - www.whatwg.org/specs/web-apps/current-work/multipage/network.html) Web Sockets (Chrome Blog - blog.chromium.org/2009/12/web-sockets-now-available-in-google.html) I prefer "WebSocket" as that seems to be most common usage and used by the W3C API as well. What do you use ?

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