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  • NightHacking Tour Continues - Don't Miss It!

    - by Tori Wieldt
    Java Evangelist Steven Chin (@steveonjava) has been motorcycling across Europe, dropping in on developers and Java User Groups to do some hacking. The visits he has already made are up on the Youtube/Java channel (including James Gosling, Ben Evans, Stephen Colebourne and Trisha Gee).  Steve will be at J-Fall in the Netherlands all day Wednesday, Oct 31. You can watch streaming live and join in on the conversation. (You mean you missed the discussion about long variable names?) Watch for #nighthacking on Twitter. Some upcoming stops on the tour include: Adam Bien (Java Champion and Author) - Friday Nov 2 at 11AM CEST (2AM PST) Andres Almiray (Griffon Founder and Author) - Sunday Nov 4 at 8PM CEST (11AM PST) In total, there will be over 20 different interviews, several JUG visits, and special coverage of J-Fall and Devoxx conferences.You can view the full schedule and watch streaming video at nighthacking.com.

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  • Harris Corporation Streamlines Manufacturing Assembly Operations with AutoVue

    - by Pam Petropoulos
    "AutoVue is a critical component to our business process; we can’t live without it.” – Charlie Davies, Principal ECAE Applications Engineer, Harris Corporation. Read how Harris Corporation, an international communications and information technology company in the high tech space, is using AutoVue to streamline their manufacturing assembly operations, enhance design reviews and improve communication of engineering changes. Click here to read the complete story.

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  • OpenJDK 6 B24 Available

    - by user9158633
    On November 16, 2011 the source bundle for OpenJDK 6 b24 was published at http://download.java.net/openjdk/jdk6/. The main changes in b24 are the latest round of security updates (e.g. the security changes in jdk repo) and a few other fixes.  For more information see the detailed list of all the changes in OpenJDK 6 B24. Test Results: All the jdk regression tests run with  make test passed. cd jdk6 make make test Per Kelly's  B23 Release blog: The new process is - all the jdk regression tests run with make test should just pass. Over time we will fix the tests that have been excluded, possibly add more tests, and exclude tests that fail to demonstrate stability (with a bug filed against the test). For the current list of excluded tests see  jdk6/jdk/test/ProblemList.txt file: ProblemList.html in B24  |  Latest ProblemList.txt (in the tip revision). Special thanks to Kelly O'Hair for his direction and Dave Katleman for his Release Engineering work.

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  • WebSocket API 1.1 released!

    - by Pavel Bucek
    Its my please to announce that JSR 356 – Java API for WebSocket maintenance release ballot vote finished with majority of “yes” votes (actually, only one eligible voter did not vote, all other votes were “yeses”). New release is maintenance release and it addresses only one issue:  WEBSOCKET_SPEC-226. What changed in the 1.1? Version 1.1 is fully backwards compatible with version 1.0, there are only two methods added to javax.websocket.Session: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 /** * Register to handle to incoming messages in this conversation. A maximum of one message handler per * native websocket message type (text, binary, pong) may be added to each Session. I.e. a maximum * of one message handler to handle incoming text messages a maximum of one message handler for * handling incoming binary messages, and a maximum of one for handling incoming pong * messages. For further details of which message handlers handle which of the native websocket * message types please see {@link MessageHandler.Whole} and {@link MessageHandler.Partial}. * Adding more than one of any one type will result in a runtime exception. * * @param clazz   type of the message processed by message handler to be registered. * @param handler whole message handler to be added. * @throws IllegalStateException if there is already a MessageHandler registered for the same native *                               websocket message type as this handler. */ public void addMessageHandler(Class<T> clazz, MessageHandler.Whole<T> handler); /** * Register to handle to incoming messages in this conversation. A maximum of one message handler per * native websocket message type (text, binary, pong) may be added to each Session. I.e. a maximum * of one message handler to handle incoming text messages a maximum of one message handler for * handling incoming binary messages, and a maximum of one for handling incoming pong * messages. For further details of which message handlers handle which of the native websocket * message types please see {@link MessageHandler.Whole} and {@link MessageHandler.Partial}. * Adding more than one of any one type will result in a runtime exception. * * * @param clazz   type of the message processed by message handler to be registered. * @param handler partial message handler to be added. * @throws IllegalStateException if there is already a MessageHandler registered for the same native *                               websocket message type as this handler. */ public void addMessageHandler(Class<T> clazz, MessageHandler.Partial<T> handler); Why do we need to add those methods? Short and not precise version: to support Lambda expressions as MessageHandlers. Longer and slightly more precise explanation: old Session#addMessageHandler method (which is still there and works as it worked till now) does rely on getting the generic parameter during the runtime, which is not (always) possible. The unfortunate part is that it works for some common cases and the expert group did not catch this issue before 1.0 release because of that. The issue is really clearly visible when Lambdas are used as message handlers: 1 2 3 session.addMessageHandler(message -> { System.out.println("### Received: " + message); }); There is no way for the JSR 356 implementation to get the type of the used Lambda expression, thus this call will always result in an exception. Since all modern IDEs do recommend to use Lambda expressions when possible and MessageHandler interfaces are single method interfaces, it basically just scream “use Lambdas” all over the place but when you do that, the application will fail during runtime. Only solution we currently have is to explicitly provide the type of registered MessageHandler. (There might be another sometime in the future when generic type reification is introduced, but that is not going to happen soon enough). So the example above will then be: 1 2 3 session.addMessageHandler(String.class, message -> { System.out.println("### Received: " + message); }); and voila, it works. There are some limitations – you cannot do 1 List<String>.class , so you will need to encapsulate these types when you want to use them in MessageHandler implementation (something like “class MyType extends ArrayList<String>”). There is no better way how to solve this issue, because Java currently does not provide good way how to describe generic types. The api itself is available on maven central, look for javax.websocket:javax.websocket-api:1.1. The reference implementation is project Tyrus, which implements WebSocket API 1.1 from version 1.8.

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  • Discount Multilingual Day in the Life of User Experience

    - by ultan o'broin
    Super article by the WikiMedia Foundation engineering folks about Designing for the Multilingual Web using the Wikipedia Universal Language Selector user interface as an example. Great ideas about tools that are available, as well as covering the basics of wireframing (mockups), prototyping, and user testing. Lots of inspiration there for developers and builders of apps who want to ensure their user experience (UX) really delivers for a global audience. Check out the use of the Firefox-based Pencil, how to translate your mockups, and how to perform remote user testing using Google+ Hangouts. Paul Giner demonstrates how to translate mockups. A little clunky and homespun in parts (I would prefer if tools such as Pencil or Balsamiq MockUps, and so on, could roundtrip directly from SVG to XLIFF for example, and Pencil doesn't work yet with the latest versions for Firefox) and I am not sure how it can really scales to enterprise-level use. However, the UX methodology is basically sound, and reinforces the importance of designing and testing in more that one language. The most powerful message for me is that you do not need special resources, training or expensive tools to deliver great-looking usable apps if you're a developer. Definitely worth considering if you're building apps out there in the community.

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  • Iterative and Incremental Principle Series 4: Iteration Planning – (a.k.a What should I do today?)

    - by llowitz
    Welcome back to the fourth of a five part series on applying the Iteration and Incremental principle.  During the last segment, we discussed how the Implementation Plan includes the number of the iterations for a project, but not the specifics about what will occur during each iteration.  Today, we will explore Iteration Planning and discuss how and when to plan your iterations. As mentioned yesterday, OUM prescribes initially planning your project approach at a high level by creating an Implementation Plan.  As the project moves through the lifecycle, the plan is progressively refined.  Specifically, the details of each iteration is planned prior to the iteration start. The Iteration Plan starts by identifying the iteration goal.  An example of an iteration goal during the OUM Elaboration Phase may be to complete the RD.140.2 Create Requirements Specification for a specific set of requirements.  Another project may determine that their iteration goal is to focus on a smaller set of requirements, but to complete both the RD.140.2 Create Requirements Specification and the AN.100.1 Prepare Analysis Specification.  In an OUM project, the Iteration Plan needs to identify both the iteration goal – how far along the implementation lifecycle you plan to be, and the scope of work for the iteration.  Since each iteration typically ranges from 2 weeks to 6 weeks, it is important to identify a scope of work that is achievable, yet challenging, given the iteration goal and timeframe.  OUM provides specific guidelines and techniques to help prioritize the scope of work based on criteria such as risk, complexity, customer priority and dependency.  In OUM, this prioritization helps focus early iterations on the high risk, architecturally significant items helping to mitigate overall project risk.  Central to the prioritization is the MoSCoW (Must Have, Should Have, Could Have, and Won’t Have) list.   The result of the MoSCoW prioritization is an Iteration Group.  This is a scope of work to be worked on as a group during one or more iterations.  As I mentioned during yesterday’s blog, it is pointless to plan my daily exercise in advance since several factors, including the weather, influence what exercise I perform each day.  Therefore, every morning I perform Iteration Planning.   My “Iteration Plan” includes the type of exercise for the day (run, bike, elliptical), whether I will exercise outside or at the gym, and how many interval sets I plan to complete.    I use several factors to prioritize the type of exercise that I perform each day.  Since running outside is my highest priority, I try to complete it early in the week to minimize the risk of not meeting my overall goal of doing it twice each week.  Regardless of the specific exercise I select, I follow the guidelines in my Implementation Plan by applying the 6-minute interval sets.  Just as in OUM, the iteration goal should be in context of the overall Implementation Plan, and the iteration goal should move the project closer to achieving the phase milestone goals. Having an Implementation Plan details the strategy of what I plan to do and keeps me on track, while the Iteration Plan affords me the flexibility to juggle what I do each day based on external influences thus maximizing my overall success. Tomorrow I’ll conclude the series on applying the Iterative and Incremental approach by discussing how to manage the iteration duration and highlighting some benefits of applying this principle.

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  • The value of money

    - by ambreesh
    A dictionary definition of money is "any circulating medium of exchange, including coins, paper money, anddemand deposits". If you ask an economist for a definition of money, you will be introduced to terms like M1, M2, M3, all of which denote tangible assets - currency, and anything that is liquid enough to be used as currency; checks, stamps and now mobile minutes being examples. The macroeconomic theory of money is fascinating - the effect of money supply on exchange rates and interest rates, the concept of the "money multiplier" (if I deposit $10 into a bank, the bank will likely loan $8 of it to someone else, who will then give it to someone else in exchange for goods and services, who will then likely deposit it again, which will result in the bank loaning it again and so on - making that $10 of money supply worth a lot more ($10+$8+$x+...)).  But all this depends on money supply - in other words, money that is printed by the mint. The Treasury Department spends a lot of time figuring out how much money to print, there is lot being written on QE2 now-a-days, which is intended to increase the money supply. Money is used to purchase goods and services, and yes it is saved too but that is so one can purchase goods and services later. Completely unrelated, there is a sea change occurring in the web world, dominated by, I believe, Facebook. With 500M active users and growing, FB has the ability to introduce a "money supply" which is completely unrelated to today's "money". Using today's money, a FB user can buy a certain number of FB$s, and then use the FB$s within FB to purchase goods and services - with the money multiplier kicking in. I remember talking with a colleague about this a few years ago, the true way to monetize the web is to introduce an alternative system to the existing, and FB has the ability to do just that. There is enough momentum, enough mass for FB to start to monetize its user base. And completely screw up the economists at the Treasury, not to mention disintermediating the banks completely. The only other ubiquitous asset is mobile minutes. People exchanging mobile minutes for tangible goods and services happens today, the big difference however is the demographic. While Safaricom offers this ability in Kenya today, FB has the 15-40 year middle class user as their user. And the next generation is growing up with FB as a standard channel for communicating with their peers. Virtual flowers when going in for the kill? If your target is an avid FB user, why not? It certainly is a lot more green - no pun intended!

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  • Calculate minimum ext3 partition size for certain amount of data

    - by Daniel Beck
    These following ext3 partitions contain identical data. As we can see, the larger the partition size, the more space is required for the same files: Filesystem 1K-blocks Used Available Use% Mounted on /dev/loop11 3965777 561064 3199964 15% [...] /dev/loop19 573029 543843 29186 95% [...] Filesystem Size Used Avail Use% Mounted on /dev/loop11 3.8G 548M 3.1G 15% [...] /dev/loop19 560M 532M 29M 95% [...] Filesystem Inodes IUsed IFree IUse% Mounted on /dev/loop11 1024000 1656 1022344 1% [...] /dev/loop19 1024000 1656 1022344 1% [...] I start with a partition of fixed size that possibly wasted a lot of space and I want to create a partition that is able to hold that data but with (almost) minimal size. How can I reliably calculate that minimal partition size needed for storing a certain amount of data? The amount of data changes over time, and I need to automate these calculations.

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  • Migrate data from one server to another using rsync

    - by Leonid Shevtsov
    I'm moving from one VPS to another, and I figured that the simplest way to transfer data would be rsync. However, the data is owned by a user, www-data, which doesn't have ssh privileges, and I'd like it to be owned by the same (named) user on the target machine. Obviously I need all file permissions preserved. I have SSH access via another user with sudo privileges on both machines. Is this possible to do this with rsync?

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  • How can I clear *old* browsing data from Google Chrome Linux, while keeping more recent data?

    - by Norman Ramsey
    I can find plenty of information on how to clear Google Chrome's recent browsing data, in various periods, as well as clearing all browsing data. But I want to clear old browsing data—say for a start, anything over two months old. (I'm trying to save space on a crowded laptop.) Does anyone know any principled way to do this, or shall I just dive into ~/.config/google, start removing likely-looking files, and hope for the best. I run Google Chrome on Debian Linux.

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  • links for 2011-01-05

    - by Bob Rhubart
    A Role-Based Approach to Automated Provisioning and Personalized Portals Authors Rex Thexton (Managing Dir, PricewaterhouseCoopers), Nishidhdha Shah (Sr. Associate at PwC Consulting) and Harish Gaur (Dir. Product Management, Oracle Fusion Middleware) bring you the final article in the Fusion Middleware Patterns series. (tags: Oracle otn entarch enterprise2.0) 13 Jan 2011 - New York, NY - Coherence Special Interest Group - Oracle Coherence Knowledge Base The world's largest enterprise software company, Oracle is the only vendor to offer solutions for every tier of your business -- database, middleware, business intelligence, business applications, and collaboration. With Oracle, you get information that helps you measure results, improve business processes, and communicate a single truth to your constituents. (tags: ping.fm) Marc Kelderman: Exporting the SOA MDS Marc Kelderman show you how in this brief tutorial. (tags: oracle otn soa mds)

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  • Displaying Exceptions Thrown or Caught in Managed Beans

    - by Frank Nimphius
    Just came a cross a sample written by Steve Muench, which somewhere deep in its implementation details uses the following code to route exceptions to the ADF binding layer to be handled by the ADF model error handler (which can be customized by overriding the DCErrorHandlerImpl class and configuring the custom class in DataBindings.cpx file) To route an exception to the ADFm error handler, Steve used the following code ((DCBindingContainer)BindingContext.getCurrent().getCurrentBindingsEntry()).reportException(ex); The same code however can be used in managed beans as well to enforce consistent error handling in ADF. As an example, lets assume a managed bean method hits an exception. To simulate this, let's use the following code: public void onToolBarButtonAction(ActionEvent actionEvent) {    throw new JboException("Just to tease you !!!!!");        } The exception shows at runtime as displayed in the following image: Assuming a try-catch block is used to intercept the exception caused by a managed bean action, you can route the error message display to the ADF model error handler. Again, let's simulate the code that would need to go into a try-catch block public void onToolBarButtonAction(ActionEvent actionEvent) {    JboException ex = new JboException("Just to tease you !!!!!");  BindingContext bctx = BindingContext.getCurrent();    ((DCBindingContainer)bctx.getCurrentBindingsEntry()).reportException(ex); } The error now displays as shown in the image below As you can see, the error is now handled by the ADFm Error handler, which - as mentioned before - could be a custom error handler. Using the ADF model error handling for displaying exceptions thrown in managed beans require the current ADF Faces page to have an associated PageDef file (which is the case if the page or view contains ADF bound components). Note that to invoke methods exposed on the business service it is recommended to always work through the binding layer (method binding) so that in case of an error the ADF model error handler is automatically used.

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  • Are Chief Digital Officers the Result of CMO/CIO Refusal to Change?

    - by Mike Stiles
    Apparently CDO no longer just stands for “Collateralized Debt Obligations.”  It stands for Chief Digital Officer. And they’re the ones who are supposed to answer the bat signal CEO’s are throwing into the sky, swoop in and POW! drive the transition of the enterprise to integrated digital systems. So imagine being a CMO or a CIO at such an enterprise and realizing it’s been determined that you are not the answer that’s needed. In fact, IntelligentHQ author Ashley Friedlein points out the very rise of the CDO is an admission of C-Suite failure to become savvy enough, quickly enough in modern technology. Is that fair? Despite the repeated drumbeat that CMO’s and CIO’s must enter a new era of cooperation and collaboration to enact the social-enabled enterprise, the verdict seems to be that if it’s happening at all, it’s not happening fast enough. Therefore, someone else is needed with the authority to make things happen. So who is this relatively new beast? Gartner VP David Willis says, “The Chief Digital Officer plays in the place where the enterprise meets the customer, where the revenue is generated, and the mission accomplished.” In other words, where the rubber meets the road. They aren’t just another “C” heading up a unit. They’re the CEO’s personal SWAT team, able to call the shots necessary across all units to affect what has become job one…customer experience. And what are the CMO’s and CIO’s doing while this is going on? Playing corporate games. Accenture reports 38% of CMOs say IT deliberately keeps them out of the loop, with 35% saying marketing’s needs aren’t a very high priority. 31% of CIOs say marketers don’t understand tech and regularly go around them for solutions. Fun! Meanwhile the CEO feels the need to bring in a parental figure to pull it all together. Gartner thinks 25% of all orgs will have a CDO by 2015 as CMO’s and particularly CIO’s (Peter Hinssen points out many CDO’s are coming “from anywhere but IT”) let the opportunity to be the agent of change their company needs slip away. Perhaps most interestingly, these CDO’s seem to be entering the picture already on the fast track. One consultancy counted 7 instances of a CDO moving into the CEO role, which, as this Wired article points out, is pretty astounding since nobody ever heard of the job a few years ago. And vendors are quickly figuring out that this is the person they need to be talking to inside the brand. The position isn’t without its critics. Forrester’s Martin Gill says the reaction from executives at some traditional companies to someone being brought in to be in charge of digital might be to wash their own hands of responsibility for all things digital – a risky maneuver given the pervasiveness of digital in business. They might not even be called Chief Digital Officers. They might be the Chief Customer Officer, Chief Experience Officer, etc. You can call them Twinkletoes if you want to, but essentially anyone who has the mandate direct from the CEO to enact modern technology changes not currently being championed by the CMO or CIO can be regarded as “boss.” @mikestiles @oraclesocialPhoto: freedigitalphotos.net

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  • KOSTENFREIE PRÜFUNGS-GUTSCHEINE - JETZT SICHERN!

    - by michaela.seika(at)oracle.com
    Nutzen Sie die Gelegenheit und kommen Sie während der CeBIT zum Oracle Implementation Specialist Prüfungstag für Oracle Applications, Middleware und Hardware. Um Zeit und Ressourcen optimal einzusetzen, haben Sie am 2. März die Möglichkeit die Implementation Specialist Prüfung direkt vor Ort in Hannover abzulegen.Bitte leiten Sie diese Einladung an Ihre entsprechenden Kollegen weiter, um die Prüfung rechtzeitig einzuplanen: www.pearsonvue.com. Voraussetzung für die Teilnahme ist eine gültige OPN Mitgliedschaft. Der Prüfungsort ist bei den Multi Media Berufsbildenden Schulen (MMBSS), Explo Plaza3, 30539 Hannover.Ihre Registrierung für den Implementation Prüfungstag richten Sie bitte an Frau Michaela Seika bis 18. Februar mit folgenden Daten: Firma, Prüfling & Kontaktdaten, Oracle Company-ID, EDU-PIN, Ja/Nein für die Zuteilung eines Prüfungs-Gutscheins.Bitte um Beachtung die kostenfreien Prüfungs-Gutscheine sind nur bis 2. März 2011 gültig. (Pro Unternehmen werden maximal zwei Gutscheine ausgegeben).

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  • Goodbye FY14, Welcome FY15!

    - by Alliances & Channels Redaktion
    FY14, ein spannendes Geschäftsjahr liegt gerade hinter uns. Das ist immer auch ein Anlass, um Bilanz zu ziehen. Lassen wir also gemeinsam 12 ereignisreiche Monate Revue passieren! Beim Blick auf die Ereignisse des FY14 stehen natürlich Sie, unsere Partner, an allererster Stelle, denn Sie leisten einen ungeheuer wichtigen Beitrag zum Erfolg von Oracle. Dafür möchte ich Ihnen heute im Namen von Oracle A&C ganz herzlich danken! Von all den Events und Highlights im Partnerbereich war die Oracle Open World auch in FY14 schon allein quantitativ das Beeindruckendste: 60.000 Besucherinnen und Besucher aus 145 Ländern, 2.555 Sessions und 3.599 Speaker. Die angereisten Partner kamen in San Francisco zum Oracle PartnerNetwork Exchange zusammen. Dort tauschten sie sich über aktuelle Fragen zu Applications, Cloud, Engineered Systems, Big Data sowie Industry Solutions aus – Themen die uns auch in FY15 sicher bewegen werden! FY14 war bei Oracle auch das Jahr der Datenbank-Offensive: Auf der Open World wurde die neue In-Memory-Option für Datenbanken präsentiert, das Schlagwort Datenbank-Tuning machte die Runde. Als Meilenstein gilt vor allem die enorme Beschleunigung, die mit Version 12.1.0.1 der Oracle Database 12c möglich wird. Diese und weitere Innovationen sorgten für viel positives Presseecho. Im Januar 2014 kamen die Partner aus ganz Deutschland nach München zum Oracle Partner Day und zur Verleihung der Oracle Excellence Awards. Wie immer war unsere Blogredaktion natürlich live vor Ort. Zu den Höhepunkten des Partner Day zählte die Key Note zur Oracle Strategie von Helene Lengler, Vice President Sales Fusion Middleware & Engineered Systems. Spannend für die Partner war auch der Blick in die Zukunft mit Andreas Zilch (Experton): Industrie 4.0 lautete eines seiner zentralen Themen - also die Frage der Informatisierung der klassischen Industrien und damit natürlich auch das Internet of Things. Ich freue mich auf neue Herausforderungen im FY2015 und vor allem auf die anregende Zusammenarbeit mit Ihnen! Wir werden gemeinsam daran arbeiten, spannende Projekte u.a. mit Big Data, Customer Experience oder Cloud zu entwickeln. Uns allen wünsche ich ein gutes, erfolgreiches Geschäftsjahr 2015. Herzlichst, Ihr Christian Werner Senior Director Alliances & Channels Deutschland

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  • Using Groovy Aggregate Functions in ADF BC

    - by Sireesha Pinninti
    This article explains how groovy aggregate functions(sum, count, min, max and avg) can be used in ADF Business components and demonstrates how these can be used at entity and view level Let's consider EMP and DEPT tables and an usecase to track number of employees in each department   Entity-Level To use aggregate functions at entity level, we need to have association between entities representing master and child relationship and the destination accessor name is what we are going to use in our groovy Syntax: <Accessor>.count(Groovyexpression) - Note down the destination accessor name(EMP) in the association or AccessorAttribute name in source entity - Add a transient attribute in source entity with persistent property set to false and provide the groovy expression in the syntax provided above - Finally, Add newly added attribute to view object View-Level To use aggregate functions at view level, we need to have a view link between viewobjects representing master and child relationship and the destination accessor name is what we are going to use in our groovy Syntax: <ViewLinkAccessor>.count(Groovyexpression) - Note down the destination accessor name(EmpView) in the view link or viewLinkAccessor name in source view - Add a transient attribute in view object and provide a groovy aggregate function count as a value to it in the syntax provided above Now, If you run application module tester and execute DeptView / ViewLink, you should see employee count in EmpCount field  In similar way, one can use other groovy aggregate functions sum, avg, min and max.

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  • OTN Virtual Developer Day: WebLogic and Coherence

    - by Tori Wieldt
    Who: Java Developers What: This OTN Virtual Developer Day will guide you through tooling and best practices around developing applications with WebLogic and Coherence. You'll also explore ways to improve your your build, deploy, and ongoing management processes in your application's life cycle. When: Tuesday, November 5, 9am to 1pm PDT / 12pm to 4pm EDT / 1pm to 5pm BRT Where: Your Desk Why: Many Java developers utilize open source and/or free tooling to develop their projects, but ultimately deploy production applications to commercial, mission-critical application servers. There are sessions utilizing common developer tools such as Eclipse, Maven, Chef, and Puppet to create, deploy and manage applications with WebLogic Server and Coherence as target platforms. Don't miss the session Exploring ADF 12C and Java EE Development in Eclipse. Register now, it's free!  

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  • Project Gantt chart using ADF BC

    - by shantala.sankeshwar
    This article describes simple example of using Project Gantt chart using ADF Business components.Use Case DescriptionLet us create a simple Project Gantt chart using ADF Business components & try to get the selected tasks details. Implementation stepsA project Gantt chart is used for project management. The chart lists tasks vertically and shows the duration of each task as a bar on a horizontal time line.To create a basic project gantt chart,we first need to define  2 tables as below:1)task_table with taskid,task_type,start_date & end_date 2)subtask_table with subtaskid,subtask_type,start_date, end_date &  taskidNow we can create Business components for the above 2 tables .Then we will create new jspx page -projectGantt.jspx Drop TaskView1 as Gantt->Project: Select all required columns under tasks & subtasks tabs of 'create Project Gantt chart' dialog.We have created Project Gantt chart that lists tasks & its subtasks.Now if we need to get all task details selected by the user then define taskSelectionListener for the dvt:projectGantt in jspx source page: taskSelectionListener="#{test.taskSelectlistener}" public void taskListener(TaskSelectionEvent taskSelectionEvent) {// This codes gives all the tasks selected by user System.out.println("Selected task details +taskSelectionEvent.getTask());            }Run the above page & note that it shows all details of tasks nodes & expanding these tasks nodes shows its corresponding subtasks details.Now if user selects 2 tasks,we can see that it prints the complete task details for the selected tasks.

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  • Diving into Scala with Cay Horstmann

    - by Janice J. Heiss
    A new interview with Java Champion Cay Horstmann, now up on otn/java, titled  "Diving into Scala: A Conversation with Java Champion Cay Horstmann," explores Horstmann's ideas about Scala as reflected in his much lauded new book,  Scala for the Impatient.  None other than Martin Odersky, the inventor of Scala, called it "a joy to read" and the "best introduction to Scala". Odersky was so enthused by the book that he asked Horstmann if the first section could be made available as a free download on the Typesafe Website, something Horstmann graciously assented to. Horstmann acknowledges that some aspects of Scala are very complex, but he encourages developers to simply stay away from those parts of the language. He points to several ways Java developers can benefit from Scala: "For example," he says, " you can write classes with less boilerplate, file and XML handling is more concise, and you can replace tedious loops over collections with more elegant constructs. Typically, programmers at this level report that they write about half the number of lines of code in Scala that they would in Java, and that's nothing to sneeze at. Another entry point can be if you want to use a Scala-based framework such as Akka or Play; you can use these with Java, but the Scala API is more enjoyable. " Horstmann observes that developers can do fine with Scala without grasping the theory behind it. He argues that most of us learn best through examples and not through trying to comprehend abstract theories. He also believes that Scala is the most attractive choice for developers who want to move beyond Java and C++.  When asked about other choices, he comments: "Clojure is pretty nice, but I found its Lisp syntax a bit off-putting, and it seems very focused on software transactional memory, which isn't all that useful to me. And it's not statically typed. I wanted to like Groovy, but it really bothers me that the semantics seems under-defined and in flux. And it's not statically typed. Yes, there is Groovy++, but that's in even sketchier shape. There are a couple of contenders such as Kotlin and Ceylon, but so far they aren't real. So, if you want to do work with a statically typed language on the JVM that exists today, Scala is simply the pragmatic choice. It's a good thing that it's such a nice choice." Learn more about Scala by going to the interview here.

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  • Groovy Debugging

    - by Vijay Allen Raj
    Groovy Debugging - An Overview:ADF BC developers may express snippets of business logic (like the following) as embedded groovy expressions: default / calculated attribute valuesvalidation rules / conditionserror message tokensLOV input values (VO) This approach has the advantages that: Groovy has a compact, EL-like syntax for expressing simple logicADF has extended this syntax to provide useful built-insembedded Groovy expressions are customizableGroovy debugging support helps improve maintainability of business logic expressed in Groovy.Following is an example how groovy debugging works.Example:This example shows how a script expression validator can be created and the groovy script debugged. It shows Step over, breakpoint functionalities as well as syntax coloring.Let us create a ADFBC application based on Emp and Dept tables, and add a script expression validator based on the script:  if (Sal >= 5000){ //If EmpSal is greater than a property value set on the custom //properties on the root AM //raise a custom exception else raise a custom warning if (Sal >= source.DBTransaction.rootApplicationModule.propertiesMap.salHigh) { adf.error.raise("ExcGreaterThanApplicationLimit"); } else { adf.error.warn("WarnGreaterThan5000"); } } else if (EmpSal <= 1000) { adf.error.raise("ExcTooLow"); }return true;In the Emp.xml Flat editor, place breakpoints at various locations as shown below:Right click the appmodule and click Debug. Enter a value greater than 5000 and click next. You can see the debugging work as shown below:  The code can be also be stepped over and debugged.

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  • Creating ADF Faces Comamnd Button at Runtime

    - by Frank Nimphius
    Normal 0 false false false EN-US X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} In ADF Faces, the command button is an instance of RichCommandButton and can be created at runtime. While creating the button is not difficult at all, adding behavior to it requires knowing about how to dynamically create and add an action listener reference. The example code below shows two methods: The first method, handleButtonPress is a public method exposed on a managed bean. public void handleButtonPress(ActionEvent event){   System.out.println("Event handled");   //optional: partially refresh changed components if command   //issued as a partial submit } The second method is called in response to a user interaction or on page load and dynamically creates and adds a command button. When the button is pressed, the managed bean method – the action handler – defined above is called. The action handler is referenced using EL in the created MethodExpression instance. If the managed bean is in viewScope, backingBeanScope or pageFlowsScope, then you need to add these scopes as a prefix to the EL (as you would when configuring the managed bean reference at design time) //Create command button and add it as a child to the parent component that is passed as an //argument to this method private void reateCommandButton(UIComponent parent){   RichCommandButton edit = new RichCommandButton();   //make the request partial   edit.setPartialSubmit(true);   edit.setText("Edit");                             //compose the method expression to invoke the event handler   FacesContext fctx = FacesContext.getCurrentInstance();   Application application = fctx.getApplication();   ExpressionFactory elFactory = application.getExpressionFactory();   ELContext elContext = facesCtx.getELContext();   MethodExpression methodExpressio = null;   //Make sure the EL expression references a valid managed bean method. Ensure   //the bean scope is properly addressed    methodExpression =  elFactory.createMethodExpression(                              elContext,"#{myRequestScopeBean.handleButtonPress}",                             Object.class,new Class[] {ActionEvent.class});   //Create the command buttonaction listener reference   MethodExpressionActionListener al = null;          al= new MethodExpressionActionListener(methodExpression);    edit.addActionListener(al);     //add new command button to parent component and PPR the component for     //the button to show    parent.getChildren().add(edit);    AdfFacesContext adfFacesContext = AdfFacesContext.getCurrentInstance();     adfFacesContext.addPartialTarget(parent);  }

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