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• Why to let / not let developers test their own work

  - by pyvi

  I want to gather some arguments as to why letting a developer testing his/her own work as the last step before the product goes into production is a bad idea, because unfortunately, my place of work sometimes does this (the last time this came up, the argument boiled down to most people being too busy with other things and not having the time to get another person familiar with that part of the program - it's very specialised software). There are test plans in this case (though not always), but I am very much in favor of making a person who didn't make the changes that are tested actually doing the final testing. So I am asking if you could provide me with a good and solid list of arguments I can bring up the next time this is discussed. Or to provide counter-arguments, in case you think this is perfectly fine especially when there are formal test cases to test.

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• Automated tests for differencing algorithm

  - by Matthew Rodatus

  We are designing a differencing algorithm (based on Longest Common Subsequence) that compares a source text and a modified copy to extract the new content (i.e. content that is only in the modified copy). I'm currently compiling a library of test case data. We need to be able to run automated tests that verify the test cases, but we don't want to verify strict accuracy. Given the heuristic nature of our algorithm, we need our test pass/failures to be fuzzy. We want to specify a threshold of overlap between the desired result and the actual result (i.e. the content that is extracted). I have a few sketches in my mind as to how to solve this, but has anyone done this before? Does anyone have guidance or ideas about how to do this effectively?

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• Where should I store and verify files manipulated by an app

  - by Alan W. Smith

  I'm working on a little Ruby script to move screenshots while renaming them based on a specific convention. I'll be writing tests to confirm the behavior. Ruby has lots of conventions for where to store files (e.g. the "spec" and "features" directories for RSpec and Cucumber, respectively), but I'm not finding best practices for storing files that will be acted upon by the tests. The same goes for a destination for the final copies of the files. So, the question in two parts is: Where should I store files that the test cases will use for a source input. Where should tests that need to write output files send them to.

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• QotD: Eben Upton on Raspberry Pi Model B Shipping With 512MB of RAM

  - by $utils.escapeXML($entry.author)

  One of the most common suggestions we’ve heard since launch is that we should produce a more expensive “Model C” version of Raspberry Pi with extra RAM. This would be useful for people who want to use the Pi as a general-purpose computer, with multiple large applications running concurrently, and would enable some interesting embedded use cases (particularly using Java) which are slightly too heavyweight to fit comfortably in 256MB.The downside of this suggestion for us is that we’re very attached to $35 as our highest price point. With this in mind, we’re pleased to announce that from today all Model B Raspberry Pis will ship with 512MB of RAM as standard.Eben Upton, a founder and trustee of the Raspberry Pi foundation, in a blog post announcing the change.

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• What are some good, simple examples for queues?

  - by Michael Ekstrand

  I'm teaching CS2 (Java and data structures), and am having some difficulty coming up with good examples to use when teaching queues. The two major applications I use them for are multithreaded message passing (but MT programming is out of scope for the course), and BFS-style algorithms (and I won't be covering graphs until later in the term). I also want to avoid contrived examples. Most things that I think of, if I were actually going to solve them in a single-threaded fashion I would just use a list rather than a queue. I tend to only use queues when processing and discovery are interleaved (e.g. search), or in other special cases like length-limited buffers (e.g. maintaining last N items). To the extent practical, I am trying to teach my students good ways to actually do things in real programs, not just toys to show off a feature. Any suggestions of good, simple algorithms or applications of queues that I can use as examples but that require a minimum of other prior knowledge?

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• Testing web applications written in java

  - by Vinoth Kumar

  How do you test the web applications (both server side and client side code)? The testing method has to work irrespective of the framework used (struts, spring web mvc) etc. I am using Java for the server side code, Javascript and HTML for the client side code. This is the sample test case of what I am talking about: 1. When you click on a link, the pop up opens. 2. Change some value in the pop up (say a drop down value) and it gets saved in the DB. 3. Click the popup again, you get the changed values. Can we simulate this kind of thing using unit test cases? Is JUnit enough for this?

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• What are the pros and cons of non-unique display names?

  - by Davy8

  I know of at least big title game (Starcraft II) that doesn't require unique display names, so it would seem like it can work in at least some circumstance. Under what situations does allowing non-unique display names work well? When does it not work well? Does it come down to whether or not impersonation of someone else is a problem? The reasons I believe it works for Starcraft II is that there isn't any kind of in-game trading of virtual goods and other than "for kicks" there isn't much incentive to impersonate someone else in the game. There's also ladder rankings so even trying to impersonate a pro is easily detectable unless you're on a similar skill level. What are some other cases where it makes sense to specifically allow or disallow duplicate display names?

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• Ubuntu gets slower by the day

  - by Doug

  Ive noticed that Ubuntu has been getting slower and slower to boot, launch programs, etc. I installed 12.04 about 4 months ago,now 12.10, running on a quad-core Q8300 Intel, 4GB Ram, and an 80GB WD IDE drive. For some reason (ever since 11.04), Ive noticed after installation, the speed is good. The longer I have the OS installed, every bootup gets slower and slower, launching programs get slower, frame rates change radically(onboard GF9400 gets anywhere from 60fps down to 12 in worst cases). I would think maybe the HD is the issue, however I installed 11.10 on a 160GB SATA, and the same thing occurred. Looking at system resources, I'm holding steady at 1GB memory usage (I have 4GB, but it's actually showing 3.6GB, dunno why), no swap usage, and using right around 4% on cpu currently. HD capacity is only 28% used. Has anyone else ran into this issue? I love Ubuntu to death, but using other distros other than Ubuntu, I dont have this problem.

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• How can I get accurate collision resolution on the corners of rectangles?

  - by ssb

  I have a working collision system implemented, and it's based on minimum translation vectors. This works fine in most cases except when the minimum translation vector is not actually in the direction of the collision. For example: When a rectangle is on the far edge on any side of another rectangle, a force can be applied, in this example down, the pushes one rectangle into the other, particularly a static object like a wall or a floor. As in the picture, the collision is coming from above, but because it's on the very edge, it translates to the left instead of back up. I've searched for a while to find an approach but everything I can find deals with general corner collisions where my problem is only in this one limited case. Any suggestions?

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• Highlighting new rows in ADF Table

  - by Sireesha Pinninti

  About This article explains how to hightlight newly inserted rows in an ADF Table without writing any extra java/javascript code.IntroductionSometimes we may wish to give more clarification to the end user by differentiating between newly inserted rows and the existing rows(i.e the rows from DB) in a table by highlighting new rows in different color as in the figure shown below. SolutionWe can achieve the same by giving following EL to inlineStyle property of every column inside af:table: #{row.row.entities[0].entityState == 0?'background-color:#307D7E;':''}ExplanationHere is the explanation for row.row.entities[0].entityState given inside EL which returns the state of the row(i.e, New, Modified, Unmodified, Initialized etc.)row - Refers to a tree node binding(instance of FacesCtrlHierNodeBinding) at runtimerow.row - Refers to an instance of row that the tree node is based onrow.row.entities[0] - Gets the Entity row at zeroth index. In most of the cases, the table will be based on single entity. If your table is based on multiple entities then the index needs to be given accordingly.row.row.entities[0].entityState - Gets Entity Object's current Entity-state in the transaction.(0 - New, Modified - 2, Unmodified - 1, Initialized - -1,  etc.,)

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• Can the following Domain Entity contain logic for creating/deleting other entities?

  - by user702769

  a) As far as I understand it, in most cases Domain Model DM doesn't contain code for creating/deleting domain entities, but instead it is the job of layers ( ie service layer or UI layer ) on top of DM to create/delete domain entities? b) Domain entities are modelled after real world entities. Assuming particular real world entity being abstracted does have the functionality of creating/deleting other real world entities, then I assume the domain entity abstracting this real world entity could also contain logic for creating/deleting other entities? class RobotDestroyerCreator { ... void heavyThinking() { ... if(...) unitOfWork.registerDelete(robot); ... if(...) { var robotNew = new Robot(...); unitOfWork.registerNew(robotNew); { ... } } Thank you

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• ManagementObjectSearcher error [migrated]

  - by Piotrek

  Some of our customers inform us that in some cases following error appears: System.Management.ManagementException: Blad dostawcy. at System.Management.ManagementException.ThrowWithExtendedInfo(ManagementStatus errorCode) at System.Management.ManagementObjectCollection.ManagementObjectEnumerator.MoveNext() The error is generated while trying to loop through a colection returned by Get() method of the System.Mamangment.ManagementObjectSearcher object. This is the code of my method: private bool PrinterExists(string printerName) { bool retVal = false; SelectQuery q = new SelectQuery("select caption from win32_printer"); using (ManagementObjectSearcher searcher = new ManagementObjectSearcher(q)) { foreach (ManagementObject printer in searcher.Get()) { if(printer["Caption"].ToString() == printerName) { retVal = true; break; } } } return retVal; } It seems that the problem appears only on Windows XP. The only workaround I know is reconstruction of WMI database. It sometimes helps, but unfortunatelly not always. Can anyone tell me what is the reason of this error and how can I fix it?

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• Sources of requirements? [closed]

  - by user970696

  I was reading a book about SW engineering the other day and it went like: Sources of both functional and non-functional requirements are: law (for specific cases) business and user requirements etc. //what else then? So the question is, what other sources of requirements there are when an analyst is gathering the information? Lets consider a desktop app for mobile operator. As for the comment, I do not think this is a broad question as the books usually mention 1-2 sources. I would like to know more, if anyone can help.

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• Deleting Pages and SEO

  - by Lynda

  I am in the process of re-designing my website. I will be changing the URL structure of several pages and in some cases the pages are going to be deleted as they are no longer necessary or obsolete. My question is this: I do not want to effect any SEO by having a lot of 404 errors pop-up. For the pages that I am changing the URL I will set 301 redirects but how do I handle the pages that I am deleting outright and have no redirects? From my understanding if those pages start showing 404s it will hurt SEO. Is this correct? How do I handle deletion of pages?

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• How can an application (like Firefox) be forced to use a certain network interface?

  - by Lekensteyn

  I've two interfaces: eth0 and wlan0 on a notebook. Possible use cases: eth0 grants me Internet access, and wlan0 is currently connected to a router which does not have Internet-connectivity. For development purposes, I need to connect to the wlan0 by default, but use eth0 for surfing eth0 and wlan0 are both connected to the Internet. For a torrent application, eth0 should be used for speed, but for portability of the notebook, SSH should have a connection over wlan0 eth0 is a wire connection, wlan0 is a wireless one. Sensible data should be transferred over eth0, but other traffic can go over wlan0 as well. Is there a way to force applications (like nc.traditional or firefox) to use a certain network interface? A wrapper like example-wrapper eth0 program is fine too if such program exist. It would be nice if it could configured within Firefox (in runtime). I'd like to avoid IPTables solutions if possible.

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• BPM in Financial Services Industry

  - by Sanjeev Sharma

  The following series of blog posts discuss common BPM use-cases in the Financial Services industry: Financial institutions view compliance as a regulatory burden that incurs a high initial capital outlay and recurring costs. By its very nature regulation takes a prescriptive, common-for-all, approach to managing financial and non-financial risk. Needless to say, no longer does mere compliance with regulation will lead to sustainable differentiation. For details, check out the 2 part series on managing operational risk of financial services process (part 1 / part 2). Payments processing is a central activity for financial institutions, especially retail banks, and intermediaries that provided clearing and settlement services. Visibility of payments processing is essentially about the ability to track payments and handle payments exceptions as payments flow from initiation to settlement. For details, check out the 2 part series on improving visibility of payments processing (part 1 / part 2).

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• Is deserializing complex objects instead of creating them a good idea, in test setup?

  - by Chris Bye

  I'm writing tests for a component that takes very complex objects as input. These tests are mixes of tests against already existing components, and test-first tests for new features. Instead of re-creating my input objects (this would be a large chunk of code) or reading one from our data store, I had the thought to serialize a live instance of one of these objects, and just deserialize it into test setup. I can't decide if this is a reasonable idea that will save effort in long run, or whether it's the worst idea that I've ever had, causing those that will maintain this code will hunt me down as soon as they read it. Is deserialization of inputs a valid means of test setup in some cases? To give a sense of scale of what I'm dealing with, the size of serialization output for one of these input objects is 93KB. Obtained by, in C#: new BinaryFormatter().Serialize((Stream)fileStream, myObject);

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• How to reinstall latest Ubuntu Touch on Nexus 4?

  - by Galen Gruman

  I've followed the instructions on https://wiki.ubuntu.com/Touch/Install, first doing the steps that lead to phablet-flash -b and then the manual ones. In both cases, I get stuck at the Google boot screen. It does not boot into Touch. No errors during manual install, and adb devices shows the device, but I get the following with phablet-flash or phablet-flash -b (second and subsequent times, not the first time): Device detected as /system/bin/sh: getprop: not found Unsupported device, autodetect fails device When working on flipped images, detection does not work and would require -d Not clear what that all means. The Nexus 4 had the initial Touch dev preview on it, FYI. I saw no separate instructions for upgrading from that.

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• What are startups expecting when they ask you to solve a programming challenge before interviewing? [closed]

  - by Swapnil Tailor

  I have applied to couple of startups and most of them are asking to solve programming challenge before they start on the interviewing candidate. I have submitted couple of the solutions and all the time getting rejected in the initial screening. Now what I think is, they will see my coding style, algorithm and OOD concepts that I have used to solve the problem. Can you guys input more on it as what other details are taken into consideration and how can I improve my coding for getting selected. By the way, I did all my coding in either Java/Perl. EDIT I feel the biggest reason for rejection is code didn't work for couple of use cases.

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• Announcement: How-To Series Explaining Customizations Step By Step

  - by Oliver Steinmeier

  Yesterday we officially launched our new YouTube channel.  Today we are announcing another initiative that we have been working on for a while: to help you learn common customization tasks, we are going to publish a series of detailed How-To documents with lots of screenshots.  Many of these will also be the script for a YouTube video, giving you the choice to see it in action or go through the steps yourself guided by a PDF document. The focus of the initial set of How-Tos will be JDeveloper/ADF customizations, but over time we will expand into other areas.  Today's first document is meant to get everyone up to the point where a JDeveloper environment is up and running: a white paper that shows you how to set up JDeveloper, configure the integrated WLS domain, and make a very, very simple customization work. As always we are looking for your feedback.  Please let us know whether this is helpful for your work or learning, and what use cases you would like to see us document in these How-Tos.

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• Webcast: Maximum Availability with Oracle GoldenGate

  - by Markus Weber

  Make sure to register here for this upcoming live webcast, with great speakers, and a live Q&A chat session.It is scheduled for Thursday, December 13th, 2012, at 10am Pacific Time. There are no doubts about the strength, and depth, of Oracle's offerings for highly available database environments. But depending on the nature of your data center environments, your different uses cases and workloads, your service level agreements and expectations, there might still be some open questions about what the best solutions and architectures are to assure high availability and/or affordable, efficient disaster recovery. Therefore, this webcast will answer questions such as: How does Oracle GoldenGate fit into Oracle's Maximum Availability Architecture ? When to use Oracle Active Data Guard ? When Oracle GoldenGate ? When both ? When Oracle GoldenGate is a definite requirement for Database High Availability ? Overall, what are new high availability features in Oracle GoldenGate 11g Release 2 ? 

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• When to use C over C++, and C++ over C?

  - by Dark Templar

  I've been introduced to Computer Science for a little over a year now, and from my experience it seems that C and C++ are both considered one of the "ultrafast" languages out there, whereas others such as Python and such scripting languages are usually deemed somewhat slower. But I've also seen many cases where a software project or even a small one would interleave files where a certain number n of those files would be written in C, and a certain number m of those files would be written in C++. (I also noticed that C++ files almost always have corresponding headers, while C files not so much). But my main point of inquiry is to get a general sense of intuition on when it is appropriate to use C over C++, and when it is better to use C++ over C. Other than the facts that (1) C++ is object-oriented whereas C is not, and (2) the syntaxes are very similar, and C++ was intentionally created to resemble C in many ways, I am not sure what their differences are. It seems to me that they are (almost) perfectly interchangeable in many domains. So it would be appreciated if someone could clear up the situation! Thanks

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• How are design-by-contract and property-based testing (QuickCheck) related?

  - by Todd Owen

  Is their only similarity the fact that they are not xUnit (or more precisely, not based on enumerating specific test cases), or is it deeper than that? Property-based testing (using QuickCheck, ScalaCheck, etc) seem well-suited to a functional programming style where side-effects are avoided. On the other hand, Design by Contract (as implemented in Eiffel) is more suited to OOP languages: you can express post-conditions about the effects of methods, not just their return values. But both of them involve testing assertions that are true in general (rather than assertions that should be true for a specific test case). And both can be tested using randomly generated inputs (with QuickCheck this is the only way, whereas with Eiffel I believe it is an optional feature of the AutoTest tool). Is there an umbrella term to encompass both approaches? Or am I imagining a relationship that doesn't really exist.

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• Branding Changes for Java EE6

  - by Paul Sorensen

  Hi Everyone, As we move the Java EE6 exams from beta to production, you may notice that we have made a slight change in the branding. Instead of being branded Oracle Certified Professional (OCP), these new credentials are now branded Oracle Certified Expert (OCE). One area where we use the Expert brand is for credentials where the technology is advanced or broader than the path based credential requires. Some are high-end add-on certifications, and others have significant additional technological breadth. In these cases, the Expert brand is an indication that someone is tested in more advanced or in-depth skills - beyond the traditional path-based certification. A few examples are RAC Expert for DBAs, or SQL Expert - also for DBAs. Because (1) all of the Java EE6 credentials require that candidates become certified first in Java SE6, and (2) many people earn more than one Java EE credential, we felt that the Expert branding would be more appropriate. Thanks,

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• Manage own framework

  - by Develman

  I have developed my own little framework for webpages. And for different websites I had to change some parts of the framework respectively developed new features / improvements. But in some cases I missed to copy the changes in the original framework code. How do you manage your frameworks? I copy the complete framework to a library folder in my projects folder structure. So I have a copy of the framework in every project. I would like to have it on one place in order to modify / improve / bugfix it once and then distribute it on the projects.

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