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• Which ATI driver version Ubuntu 10.04 LTS used?

  - by Jack

  I have a trouble with ATI driver with Ubuntu 12.04 LTS. When I install ATI driver in Ubuntu 12.04 via "Additional Driver", then I can't shutdown Ubuntu, it showed blank (black) screen and my laptop still run. Sometimes, my screen like that: http://www.youtube.com/watch?v=U9_iygesbBM But when I install Ubuntu 10.04 and install ATI driver via "Additional Driver", it's very good and no trouble I've seen. It's sweet but 10.04 is old and is supported to 4/2013. So I want to know why Ubuntu 10.04 works good better than 12.04 with ATI driver (in my case)?

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• How to deal with tautology in comments?

  - by Tamás Szelei

  Sometimes I find myself in situations when the part of code that I am writing is (or seems to be) so self-evident that its name would be basically repeated as a comment: class Example { /// <summary> /// The location of the update. /// </summary> public Uri UpdateLocation { get; set; }; } (C# example, but please refer to the question as language-agnostic). A comment like that is useless; what am I doing wrong? Is it the choice of the name that is wrong? How could I comment parts like this better? Should I just skip the comment for things like this?

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• java framework for a web wizard

  - by snippl

  I'd like to create a web wizard or a wizard on/within a website. I know there are several java frameworks for wizards but there is none for the web in particular. If I search for a framework, I always get wizards to create a website, applet, servlet and what not. But never how to create such a wizard itself. So the question(s) is: What framework should I use to create a web wizard? And what frameworks are there? The wizard will be the visualisation for a BPEL Process deployment on a apache ode. I thought a webapp would be an easy way because the apache is running anyway. I'm not bound to that, perhaps someone has a better idea.

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• Building a Roadmap for an IAM Platform

  - by B Shashikumar

  Identity Management is no longer a departmental solution, it has become a strategic part of every organization's security posture. Enterprises require a forward thinking Identity Management strategy. In our previous blog post on "The Oracle Platform Approach", we discussed a recent study by Aberdeen which showed that organizations taking a platform approach can reduce cost by as much as 48% and have 35% fewer audit deficiencies. So how does an organization get started with an Identity Management (IAM) Platform? What are the components of such a platform and how can an organization continuously evolve it for better ROI and IT agility. What are some of the best practices to begin an IAM deployment? To find out the answers and to learn how ot build a comprehensive IAM roadmap, check out this presentation which discusses how Oracle can provide a quick start to your IAM program.  Platform approach-series-building a-roadmap-finalv1 View more presentations from OracleIDM

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• New Time Zone Patch DST V18 is available

  - by Mike Dietrich

  Sorry for not updating the blog more often at the moment - but more updates will come soon as I play around with Oracle Restart and single instance databases in ASM with Oracle 11.2. Just on the side there's a new time zone patch to DST V18 available since May 2012. You can download it via PATCH download from MOS with the patch number: 13417321 What do you think? Will Lufthansa operate a faster jet the other night? Will the jet stream be more powerful? Or a better type of fuel? Or is it just the travel portal which hasn't applied the correct time zone patches to catch DST change that night in the US whereas it happens two weeks later in Europe? Guess ... And please see the readme about how to apply the patch and our slides about why time zone patching may be important even in your environment RDBMS bug: Bug 13417321: DST 18 : HALF YEARLY DST PATCHES, MAY 2012 OJVM Bug 14112098 - dst changes for dstv18 (tzdata2012c) - need ojvm fix

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• Webcast: Everything You Need To Know About AutoInvoice Date Derivation & Accounting Rules

  - by Annemarie Provisero-Oracle

  Webcast: Everything You Need To Know About AutoInvoice Date Derivation & Accounting Rules Date: June 11, 2014 at 11:00 am ET, 9:00 am MT, 4:00 pm GMT, 8:30 pm IST This one-hour session is part two of a three part series on AutoInvoice and is recommended for technical and functional users who would like a better understanding of Date Derivation and Accounting Rules as they relate to AutoInvoice. We will review commonly encountered issues, troubleshooting steps and tools available to assist in assessing and resolving issues. Topics will include: Commonly encountered issues when using Date Derivation & Accounting Rules with AutoInvoice Troubleshooting Date Derivation & Accounting Rules Related diagnostic tools Details & Registration: Doc ID 1671932.1

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• How to do thread management in C++?

  - by Dipan Mehta

  We use pthread for thread management in C based systems. pthread is in general compilable by C++ compiler (like g++). However, what are the better ways of abstractions for threads in C++? Also, for making any system to be working in a multi-threaded system, it is also important to make thread safe. What are the standard libraries that requires alternative (installs) to be thread safe or are they unsafe for multi-threaded environments? Is smart pointers, templates require special measures to make it safe? What are the best practices for the thread managements in C++?

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• What the best way to wire up Entity Framework database context (model) to ViewModel in MVVM WPF?

  - by hal9k2

  As in the question above: What the best way to wire up Entity Framework database model (context) to viewModel in MVVM (WPF)? I am learning MVVM pattern in WPF, alot of examples shows how to implement model to viewModel, but models in that examples are just simple classes, I want to use MVVM together with entity framework model (base first approach). Whats the best way to wire model to viewModel. Thanks for answers. //ctor of ViewModel public ViewModel() { db = new PackageShipmentDBEntities(); // Entity Framework generated class ListaZBazy = new ObservableCollection<Pack>(db.Packs.Where(w => w.IsSent == false)); } This is my usual ctor of ViewModel, think there is a better way, I was reading about repository pattern, not sure if I can adapt this to WPF MVVM

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• How essential is it to make a service layer?

  - by BornToCode

  I started building an app in 3 layers (DAL, BL, UI) [it mainly handles CRM, some sales reports and inventory]. A colleague told me that I must move to service layer pattern, that developers came to service pattern from their experience and it is the better approach to design most applications. He said it would be much easier to maintain the application in the future that way. Personally, I get the feeling that it's just making things more complex and I couldn't see much of a benefit from it that would justify that. This app does have an additional small partial ui that uses some (but only few) of the desktop application functions so I did find myself duplicating some code (but not much). Just because of some code duplication I wouldn't convert it to be service oriented, but he said I should use it anyway because in general it's a very good architecture, why programmers are so in love with services?? I tried to google on it but I'm still confused and can't decide what to do.

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• Software development, basics of design, conventions and scalability

  - by goce ribeski

  I need to improve my programming skills in order to achieve better scalability for the software I'm working on. Purpose is to learn the rules of adding new modules and features, so when it comes to maintaining existing ones there is some concept. So, I'm looking for a good book, tutorial or websites where I can continue to read about this. Currently, what I know and what I do is: to design relational database(3NF), make separate class for each table put that in MVC implement modular programming ...write code and hope for the best... I presume that next things I need to learn more deeply are: programming codex(naming, commenting, conventions...), organize functions building interfaces organizing custom made libraries, organizing API that I'm using, documenting, team work... ... At last what my job is, it does't need to affect your answer, PHP CodeIgniter developer.

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• Why Enabling “Do Not Track” Doesn’t Stop You From Being Tracked

  - by Chris Hoffman

  The “Do Not Track” option is enabled by default in Windows 8’s Internet Explorer 10 and available in Firefox, Safari, and Opera. Google is even adding it to Chrome. There’s just one problem: it doesn’t actually prevent tracking. The Do Not Track check box can provide a false sense of security. While a few websites will pay attention to it, the vast majority of websites will ignore your preference. Why Enabling “Do Not Track” Doesn’t Stop You From Being Tracked HTG Explains: What is the Windows Page File and Should You Disable It? How To Get a Better Wireless Signal and Reduce Wireless Network Interference

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• Sync active wallpaper/background between KDE and Gnome/Unity

  - by Ike

  Is there solution using a utility or folder shortcuts that would keep the active desktop wallpaper/background the same in KDE and Gnome/Unity. (Changing the background in one desktop would also change the other desktop's wallpaper) I use both desktops because they both serve me better for different tasks, and i'd like to match LightDM login background for KDE as well. Regardless of that it would just be nice to accomplish this for personal consistency and unity. This is no heart breaker if it's not possible. It's just an extra couple of steps when I want to change my background. note: in KDE I disable ksplash

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• Git bug branching convention

  - by kisplit

  I've been following the successful Git branching model guide for most of my development. I still wonder if the way I handle bug tickets is correct. My current workflow: Once I accept a bug ticket I will do a git checkout -b bug/{ticket_number}, create a single commit as a fix and then checkout develop and do a git merge --no-ff. I'd love to hear from the experiences of others whether or not I am abusing the --no-ff option in this instance. If I am, could someone suggest a better approach?

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• Should I limit my type name suffix vocabulary when using OOP?

  - by Den

  My co-workers tend to think that it is better to limit non-domain type suffixes to a small fixed set of OOP-pattern inspired words, e.g.: *Service *Repository *Factory *Manager *Provider I believe there is no reason to not extend that set with more names, e.g. (some "translation" to the previous vocabulary is given in brackets): *Distributor (= *DistributionManager or *SendingService) *Generator *Browser (= *ReadonlyRepositoryService) *Processor *Manipulator (= *StateMachineManager) *Enricher (= *EnrichmentService) (*) denotes some domain word, e.g. "Order", "Student", "Item" etc. The domain is probably not complex enough to use specialized approaches such as DDD which could drive the naming.

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• Virtual Developer Day: Oracle WebLogic Server & Java EE (#OTNVDD)

  - by Justin Kestelyn

  Virtual Developer Day is back with a vengeance! On Feb. 1, login to learn how Oracle WebLogic Server enables a whole new level of productivity for enterprise developers. Also hear the latest on Java EE 6 and the programming tenets that have made it a true platform breakthrough, and get hands-on with our VirtualBox virtual machine image! Even better, you never have to leave your desk - you'll get access to live sessions with chat support, and even 1-1 desktop sharing upon request. It's a no-brainer, get registered!

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• Performance triage

  - by Dave

  Folks often ask me how to approach a suspected performance issue. My personal strategy is informed by the fact that I work on concurrency issues. (When you have a hammer everything looks like a nail, but I'll try to keep this general). A good starting point is to ask yourself if the observed performance matches your expectations. Expectations might be derived from known system performance limits, prototypes, and other software or environments that are comparable to your particular system-under-test. Some simple comparisons and microbenchmarks can be useful at this stage. It's also useful to write some very simple programs to validate some of the reported or expected system limits. Can that disk controller really tolerate and sustain 500 reads per second? To reduce the number of confounding factors it's better to try to answer that question with a very simple targeted program. And finally, nothing beats having familiarity with the technologies that underlying your particular layer. On the topic of confounding factors, as our technology stacks become deeper and less transparent, we often find our own technology working against us in some unexpected way to choke performance rather than simply running into some fundamental system limit. A good example is the warm-up time needed by just-in-time compilers in Java Virtual Machines. I won't delve too far into that particular hole except to say that it's rare to find good benchmarks and methodology for java code. Another example is power management on x86. Power management is great, but it can take a while for the CPUs to throttle up from low(er) frequencies to full throttle. And while I love "turbo" mode, it makes benchmarking applications with multiple threads a chore as you have to remember to turn it off and then back on otherwise short single-threaded runs may look abnormally fast compared to runs with higher thread counts. In general for performance characterization I disable turbo mode and fix the power governor at "performance" state. Another source of complexity is the scheduler, which I've discussed in prior blog entries. Lets say I have a running application and I want to better understand its behavior and performance. We'll presume it's warmed up, is under load, and is an execution mode representative of what we think the norm would be. It should be in steady-state, if a steady-state mode even exists. On Solaris the very first thing I'll do is take a set of "pstack" samples. Pstack briefly stops the process and walks each of the stacks, reporting symbolic information (if available) for each frame. For Java, pstack has been augmented to understand java frames, and even report inlining. A few pstack samples can provide powerful insight into what's actually going on inside the program. You'll be able to see calling patterns, which threads are blocked on what system calls or synchronization constructs, memory allocation, etc. If your code is CPU-bound then you'll get a good sense where the cycles are being spent. (I should caution that normal C/C++ inlining can diffuse an otherwise "hot" method into other methods. This is a rare instance where pstack sampling might not immediately point to the key problem). At this point you'll need to reconcile what you're seeing with pstack and your mental model of what you think the program should be doing. They're often rather different. And generally if there's a key performance issue, you'll spot it with a moderate number of samples. I'll also use OS-level observability tools to lock for the existence of bottlenecks where threads contend for locks; other situations where threads are blocked; and the distribution of threads over the system. On Solaris some good tools are mpstat and too a lesser degree, vmstat. Try running "mpstat -a 5" in one window while the application program runs concurrently. One key measure is the voluntary context switch rate "vctx" or "csw" which reflects threads descheduling themselves. It's also good to look at the user; system; and idle CPU percentages. This can give a broad but useful understanding if your threads are mostly parked or mostly running. For instance if your program makes heavy use of malloc/free, then it might be the case you're contending on the central malloc lock in the default allocator. In that case you'd see malloc calling lock in the stack traces, observe a high csw/vctx rate as threads block for the malloc lock, and your "usr" time would be less than expected. Solaris dtrace is a wonderful and invaluable performance tool as well, but in a sense you have to frame and articulate a meaningful and specific question to get a useful answer, so I tend not to use it for first-order screening of problems. It's also most effective for OS and software-level performance issues as opposed to HW-level issues. For that reason I recommend mpstat & pstack as my the 1st step in performance triage. If some other OS-level issue is evident then it's good to switch to dtrace to drill more deeply into the problem. Only after I've ruled out OS-level issues do I switch to using hardware performance counters to look for architectural impediments.

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• Structure of a correctly implemented JTable with TableModel and Listeners?

  - by bamboocha

  I am pretty new to Java and its JTables and this is where I am struggling at the moment. I need to create a GUI which shows me results of a sql query like SELECT * FROM tblPeople WHERE name='Doe'. My idea was to create a a JFrame which displays a JTable with all found records. Besides this, I need to also implement some code to handle when a user is double clicking a record or selecting it by using his arrow keys (additional feature: pressing 12(e.g.) should select the 12th record). What is the best way to structure my program (what classes do I need and especially where do I store my logic)? I came up with structuring it the following way: Main.java ("view") SQLConnection.java PeopleTableModel.java (only stores and returns data given by the passed ResultSet, "model" inherits from DefaultTableModel) PeopleTable.java (stores basically all my logic including KeyListener and MouseListener, "controller", inherits from JTable) Are there better ways to achieve my goals? If so, what are they?

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• Strategy/algorithm to divide fair teams based on history

  - by Vegar

  We are a group of people playing floorball together on a regular basis. Every session starts with the daunting task of dividing teams... So what would be better than an application to pick teams automatically? So, given a history of team-combinations and results, and a list of people showing up for this particular session, what would be a good strategy to find the optimal teams? By optimal, I mean teams as equal as possible. Any ideas? Edit: To make it clear, the date that I have to base the picking on, would be something like this: [{ team1: ["playerA", "playerB", "playerC"], team2: ["playerD", "playerE", "playerF"], goals_team1: 10, goals_team2: 8 }, { team1: ["playerD", "playerB", "playerC"], team2: ["playerA", "playerE", "playerG"], goals_team1: 2, goals_team2: 5 }, { team1: ["playerD", "playerB", "playerF"], team2: ["playerA", "playerE", "playerC"], goals_team1: 4, goals_team2: 2 }]

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• How to set up an informational interview?

  - by Ethel Evans

  I've heard a lot about informational interviews, but don't have the slightest idea how to actually set one up or run one effectively. I work as an SDET (SDE in Test) in an area with lots of great technical companies, and would like to have a better understanding of how different companies do testing. I have three sub-questions: Who would I get in contact with to set up informational interviews at a company that I'd like to learn about? How can I make sure the time is productive? And, how do I keep the interview from being a burden to the employee(s) whom I speak with?

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• Single or multiple return statements in a function [on hold]

  - by Juan Carlos Coto

  When writing a function that can have several different return values, particularly when different branches of code return different values, what is the cleanest or sanest way of returning? Please note the following are really contrived examples meant only to illustrate different styles. Example 1: Single return def my_function(): if some_condition: return_value = 1 elif another_condition: return_value = 2 else: return_value = 3 return return_value Example 2: Multiple returns def my_function(): if some_condition: return 1 elif another_condition: return 2 else: return 3 The second example seems simpler and is perhaps more readable. The first one, however, might describe the overall logic a bit better (the conditions affect the assignment of the value, not whether it's returned or not). Is the second way preferable to the first? Why?

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• Random/Procedural vs. Previously Made Level Generation

  - by PythonInProgress

  I am making a game (called "Glory") that is a top-down explorer game, and am wondering what the advantages/disadvantages of using random/procedural generation vs. pre-made levels are. There seems to be few that i can think of, other than the fact that items may be a problem to distribute in randomly generated terrain, and that the generated terrain may look weird. The downside to previously made levels is that I would need to make a level editor, though. I cannot decide what is better to use.

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• Oracle Process Accelerators Release 11.1.1.7.0 Now Available

  - by Cesare Rotundo

  The new Oracle Process Accelerators (PA) Release (11.1.1.7.0) delivers key functionality in many dimensions: new PAs across industries, new functionality in preexisting PAs, and an improved installation process. All PAs in Release 11.1.1.7.0 run on the latest Oracle BPM Suite and SOA Suite, 11.1.1.7. New PAs include: Financial Reports Approval (FRA): end-to-end solution for efficient and controlled Financial Report review and approval process, enabling financial analysts and decision makers to collaborate around Excel. Electronic Forms Management (EFM): supports the process to design and expose eForms with the ability to quickly design eForms and associate approval processes to them, and to then enable users to select, fill, and submit eForms for approval Mobile Data Offloading (MDO): enables telecommunications providers to reduce congestion on cellular networks and lower cost of operations by using Oracle Event Processing (OEP) and BAM to switch devices from cellular networks to Wi-Fi. By adopting the latest PA release , customers will also be able to better identify and kick-start smart extension of their processes where business steps are supported by Apps: PA 11.1.1.7.0 includes out-of-the-box business process extension scenarios with Oracle Apps such as Siebel (FSLO) and PeopleSoft (EOB).

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• usage of setPropertyListener and setActionListener

  - by Vijay Mohan

  The incorrect usage could lead to hard-to-debug problems so better to understand the fundamentals behind it's working.setpropertyListener queues an event on the server side, so if for a command component you have a showPopup behavior/actionListner as well as setPropertyListener then fwk does the queuing correctly and raises further event on the component. While, the setactionListener simply raises an event on the server side instead of queueing it, so any further event on command component gets cancelled.Also, if you use an ActionListener and showPopup behavior together on a command component, then the order of their invocation is undetermined and also one of event gets cancelled on the component. So, either use only actionListner and do the popup invocation stuff progrmmatically in your bean or use the declarative stuff logically so that no clash of event happens.

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• What user-friendly term should I use for a view that lives under a tab in a tab bar app?

  - by Emile Cormier

  My app uses a tab bar controller. In the user documentation, I'm not sure what name to use for a view that lives under a tab. For example, the app has a Settings tab. In the user documentation, I have a sentence that goes something like this: This threshold can be adjusted in the Settings tab. "Settings tab" is not terribly user-friendly. What would be a better term than "tab"? I've looked though Apple's Human Interface Guideline, but I can't find what would be the official user-friendly term for "view that lives under a tab".

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• Why should a class be anything other than "abstract" or "final/sealed"

  - by Nicolas Repiquet

  After 10+ years of java/c# programming, I find myself creating either: abstract classes: contract not meant to be instantiated as-is. final/sealed classes: implementation not meant to serve as base class to something else. I can't think of any situation where a simple "class" (i.e. neither abstract nor final/sealed) would be "wise programming". Why should a class be anything other than "abstract" or "final/sealed" ? EDIT This great article explains my concerns far better than I can.

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