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• Creative, busy Devoxx week

  - by JavaCecilia

  I got back from my first visit to the developer conference Devoxx in Antwerp. I can't describe the vibes of the conference, it was a developer amusement park, hackergartens, fact sessions, comic relief provided by Java Posse, James Bond and endless hallway discussions.All and all - I had a lot of fun, my main mission was to talk about Oracle's main focus for OpenJDK which besides development and bug fixing is making sure the infrastructure is working out for the full community. My focus was not to hang out at night club the Noxx, but that was came included in the package :)The London Java community leaders Ben Evans and Martijn Verburg are leading discussions in the community to lay out the necessary requirements for the infrastructure for build and test in the open. They called a first meeting at JavaOne gathering 25 people, including people from RedHat, IBM and Oracle. The second meeting at Devoxx included 14 participants and had representatives from Oracle and IBM. I hope we really can find a way to collaborate on this, making sure we deliver an efficient infrastructure for all engineers to contribute to OpenJDK with.My home in all of this was the BOF rooms and the sessions there meeting the JUG leaders, talking about OpenJDK infrastructure and celebrating the Duchess Duke Award together with the others. The restaurants in the area was slower than I've ever seen, so I missed out on Trisha Gee's brilliant replay of the workshop "The Problem with Women in IT - an Agile Approach" where she masterly leads the audience (a packed room, 50-50 gender distribution) to solve the problem of including more diversity in the developer community. A tough and sometimes sensitive topic where she manages to keep the discussion objective with a focus of improving the matter from a business perspective. Mattias Karlsson is organizing the Java developer conference Jfokus in Stockholm and was there talking to Andres Almires planning a Hackergarten with a possible inclusion of an OpenJDK bugathon. That would be really cool, especially as the Oracle Stockholm Java development office is just across the water from the Jfokus venue, some of the local JVM engineers will likely attend and assist, even though the bug smashing theme will likely be more starter level build warnings in Swing or langtools than fixing JVM bugs.I was really happy that I managed to catch a seat for the Java Posse live podcast "the Third Presidential Debate" a lot of nerd humor, a lot of beer, a lot of fun :) The new member Chet had a perfect dead pan delivery and now I just have to listen more to the podcasts! Can't get the most perfect joke out of my head, talking about beer "As my father always said: Better a bottle in front of me than a frontal lobotomy" - hilarious :)I attended the sessions delivered by my Stockholm office colleagues Marcus Lagergren (on dynamic languages on the jvm, JavaScript in particular) and Joel Borggrén-Franck (Annotations) and was happy to see the packed room and all the questions raised at the end.There's loads of stuff to write about the event, but just have to pace myself for now. It was a fantastic event, captain Stephan Janssen with crew should be really proud to provide this forum to the developer community!

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• How to determine the source of a request in a distributed service system?

  - by Kabumbus

  Map/Reduce is a great concept for sorting large quantities of data at once. What to do if you have small parts of data and you need to reduce it all the time? Simple example - choosing a service for request. Imagine we have 10 services. Each provides services host with sets of request headers and post/get arguments. Each service declares it has 30 unique keys - 10 per set. service A: name id ... Now imagine we have a distributed services host. We have 200 machines with 10 services on each. Each service has 30 unique keys in there sets. but now to find to which service to map the incoming request we make our services post unique values that map to that sets. We can have up to or more than 10 000 such values sets on each machine per each service. service A machine 1 name = Sam id = 13245 ... service A machine 1 name = Ben id = 33232 ... ... service A machine 100 name = Ron id = 777888 ... So we get 200 * 10 * 30 * 30 * 10 000 == 18 000 000 000 and we get 500 requests per second on our gateway each containing 45 items 15 of which are just noise. And our task is to find a service for request (at least a machine it is running on). On all machines all over cluster for same services we have same rules. We can first select to which service came our request via rules filter 10 * 30. and we will have 200 * 30 * 10 000 == 60 000 000. So... 60 mil is definitely a problem... I hope to get on idea of mapping 30 * 10 000 onto some artificial neural network alike Perceptron that outputs 1 if 30 words (some hashes from words) from the request are correct or if less than Perceptron should return 0. And I’ll send each such Perceptron for each service from each machine to gateway. So I would have a map Perceptron <-> machine for each service. Can any one tall me if my Perceptron idea is at least “sane”? Or normal people do it some other way? Or if there are better ANNs for such purposes?

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• How to manage sub-domains on WinHost with IIS7 URL Rewrite 2.0?

  - by jrummell

  I'm trying out WinHost and I'm running into some issues with sub-domains. On WinHost, you can have multiple sub-domains per hosting account, but each sub-domain points to the root website. E.g. you can have www.example.com, sub1.example.com, and sub2.example.com but all of them display the content at http://www.example.com/. Other Hosts allow you to point sub-domains to a sub folder in your website. This would allow you to point sub1.example.com to /sub1, sub2.example.com to /sub2 and www.example.com to /. WinHost recommends using an asp/aspx page to redirect http://sub1.example.com to http://sub1.example.com/sub1, which points to /sub1. While that would work, I'd like to not have the subdomain in the url twice. So I tried using IIS7 URL Rewrite to point http://sub1.example.com to /sub1. Ben Powell describes this in detail on his blog. This is great, except Request.ApplicationPath is now /sub1/path/to/current/page.aspx, which breaks ASP.Net Themes (and probably other stuff too). What can I do to fix the ApplicationPath? Is there a better way to accomplish this?

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• FastCGI and Apache 500 error intermittently

  - by benkorn1

  Hello, I have a FastCGI (mod_fastcgi)problem. It happens every once in a while, and does not casue a complete server meltdown, just 500 errors. Here are a couple things. First I am using APC so PHP is in control of it's own processes, not FastCGI. Also, I have the webroot set as: /var/www/html And the fcgi-bin inside: /var/www/html/fcgi-bin First off here is the apache error_log: [Fri Jan 07 10:22:39 2011] [error] [client 50.16.222.82] (4)Interrupted system call: FastCGI: comm with server "/var/www/html/fcgi-bin/php.fcgi" aborted: select() failed, referer: http://www.domain.com/ I also ran strace on the 'fcgi-pm' process. Here is a snip from the trace around the time it bombs out: 21725 gettimeofday({1294420603, 14360}, NULL) = 0 21725 read(14, "C /var/www/html/fcgi-bin/php.fcgi - - 6503 38*", 16384) = 46 21725 alarm(131) = 0 21725 select(15, [14], NULL, NULL, NULL) = 1 (in [14]) 21725 alarm(0) = 131 21725 gettimeofday({1294420603, 96595}, NULL) = 0 21725 read(14, "C /var/www/html/fcgi-bin/php.fcgi - - 6154 23*C /var/www/html/fcgi-bin/php.fcgi - - 6483 28*", 16384) = 92 21725 alarm(131) = 0 21725 select(15, [14], NULL, NULL, NULL) = 1 (in [14]) 21725 alarm(0) = 131 21725 gettimeofday({1294420603, 270744}, NULL) = 0 21725 read(14, "C /var/www/html/fcgi-bin/php.fcgi - - 5741 38*", 16384) = 46 21725 alarm(131) = 0 21725 select(15, [14], NULL, NULL, NULL) = 1 (in [14]) 21725 alarm(0) = 131 21725 gettimeofday({1294420603, 311502}, NULL) = 0 21725 read(14, "C /var/www/html/fcgi-bin/php.fcgi - - 6064 32*", 16384) = 46 21725 alarm(131) = 0 21725 select(15, [14], NULL, NULL, NULL) = 1 (in [14]) 21725 alarm(0) = 131 21725 gettimeofday({1294420603, 365598}, NULL) = 0 21725 read(14, "C /var/www/html/fcgi-bin/php.fcgi - - 6179 33*C /var/www/html/fcgi-bin/php.fcgi - - 5906 59*", 16384) = 92 21725 alarm(131) = 0 21725 select(15, [14], NULL, NULL, NULL) = 1 (in [14]) 21725 alarm(0) = 131 21725 gettimeofday({1294420603, 454405}, NULL) = 0 I noticed that the 'select()' seems to stay the same regardless, however the read() changes its return from 46 to some other number while it is bombing out. Has anyone seen anything like this. Could this be some sort of file locking? Thanks, Ben

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• i7 overclocking problem

  - by benwebdev

  Hi everyone, I've got an overclocked system that seems to be misbehaving. When trying to boot up from cold the system just hangs and nothing is output to the screen. Fans are on as they should but nothing happens to finish the boot. From here I have to switch it off then on again and the boot completes. If I go into the tweak menu in the BIOS I'm informed that a boot has failed I've been in touch with Overclockers UK support a bit and theres not yet been a solution. We've mainly been tweaking the voltage for the CPU. Any suggestions? I'm new to Overclocking which is why I got a bundle with OCUK. With this issue happening on Cold Boot too its tricky to test as I have to make a change then wait till the next day. My system is here: Intel Core i7 930 2.80Ghz overclocked to 4GHz Gigabyte X58A-UD3R (BIOS Version: FC) 6GB RAM Power Supply - CoolerMaster Silent Pro M series 700W One suggestion made by OCUK was that maybe its the power supply but I'm not sure and dont have a spare - it's brand new and a pretty expensive piece of kit. Any thoughts on this? Other recomendations for Power? thanks Ben

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• FastCGI and Apache 500 error intermittently

  - by benkorn1

  I have a FastCGI (mod_fastcgi)problem. It happens every once in a while, and does not casue a complete server meltdown, just 500 errors. Here are a couple things. First I am using APC so PHP is in control of it's own processes, not FastCGI. Also, I have the webroot set as: /var/www/html And the fcgi-bin inside: /var/www/html/fcgi-bin First off here is the apache error_log: [Fri Jan 07 10:22:39 2011] [error] [client 50.16.222.82] (4)Interrupted system call: FastCGI: comm with server "/var/www/html/fcgi-bin/php.fcgi" aborted: select() failed, referer: http://www.domain.com/ I also ran strace on the 'fcgi-pm' process. Here is a snip from the trace around the time it bombs out: 21725 gettimeofday({1294420603, 14360}, NULL) = 0 21725 read(14, "C /var/www/html/fcgi-bin/php.fcgi - - 6503 38*", 16384) = 46 21725 alarm(131) = 0 21725 select(15, [14], NULL, NULL, NULL) = 1 (in [14]) 21725 alarm(0) = 131 21725 gettimeofday({1294420603, 96595}, NULL) = 0 21725 read(14, "C /var/www/html/fcgi-bin/php.fcgi - - 6154 23*C /var/www/html/fcgi-bin/php.fcgi - - 6483 28*", 16384) = 92 21725 alarm(131) = 0 21725 select(15, [14], NULL, NULL, NULL) = 1 (in [14]) 21725 alarm(0) = 131 21725 gettimeofday({1294420603, 270744}, NULL) = 0 21725 read(14, "C /var/www/html/fcgi-bin/php.fcgi - - 5741 38*", 16384) = 46 21725 alarm(131) = 0 21725 select(15, [14], NULL, NULL, NULL) = 1 (in [14]) 21725 alarm(0) = 131 21725 gettimeofday({1294420603, 311502}, NULL) = 0 21725 read(14, "C /var/www/html/fcgi-bin/php.fcgi - - 6064 32*", 16384) = 46 21725 alarm(131) = 0 21725 select(15, [14], NULL, NULL, NULL) = 1 (in [14]) 21725 alarm(0) = 131 21725 gettimeofday({1294420603, 365598}, NULL) = 0 21725 read(14, "C /var/www/html/fcgi-bin/php.fcgi - - 6179 33*C /var/www/html/fcgi-bin/php.fcgi - - 5906 59*", 16384) = 92 21725 alarm(131) = 0 21725 select(15, [14], NULL, NULL, NULL) = 1 (in [14]) 21725 alarm(0) = 131 21725 gettimeofday({1294420603, 454405}, NULL) = 0 I noticed that the 'select()' seems to stay the same regardless, however the read() changes its return from 46 to some other number while it is bombing out. Has anyone seen anything like this. Could this be some sort of file locking? Thanks, Ben

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• LogMeIn style remote access to NAS drive

  - by Mere Development

  I've been asked to setup some remote access to a NAS drive. The NAS drive will sit on a VLAN inside a network that uses a Cisco 891 IS router as gateway. The charity have no SSL-VPN licenses for the Cisco. At present there are no open ports or services on the Cisco itself and ideally we would like to keep it that way for a while, hence the request for a LogMeIn style service that's initiated from inside. We need multiple user access, about 10 max. Using LogMeIn on a machine connected to the NAS would only provide screen sharing I believe, and no concurrent connections (could be wrong?) The end users need to be able to read and write files to the NAS from Mac's and PC's around the globe. Read-only access from Mobile devices would be a bonus but not absolutely necessary. This is for a charity, non-commercial, but they are willing to spend if necessary. Cisco config knowledge is at a minimum so if I can avoid upsetting that delicate device I'll be happy :) Anyone have any clever ideas? I can provide more information on request. Thanks, Ben

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• MSSQL Timing out, a couple of questions...

  - by user29000

  Hi, About once a week, my MSSQL server is timing out, or rather the machine runs out of RAM. This morning it reached 3.9GB of the available 4, with MSSQL taking up 2.5GB. I'm concerned that i've not configured SQL to release memory as it should, so I ran sp_who2 while the timeouts were occuring to see what process were running. If i could post the CSV datafile i would, however, there were 85 processes in total, mostly related to the Full Text service: FT Gatherer - About 35 of these running under the 'sa' account against the master database with status of either sleeping or background, many were dependant on other processes. Is that normal? MySite database - There were only 5 processes for the one active site/database and all were either sleeping or suspended - but their lastBatch dates were set to 1/12/2020. Is that normal? The datbase is only about 20mb in size the traffic levels are very low, so i'm thinking of maybe limiting the amount of RAM SQL has access to (from unlimted to maybe 2GB). Any thoughts / advise would be appreciated. Mny thanks Ben

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• Virtual box host-only adapter configuration

  - by Xoundboy

  I have VirtualBox 4 running on Win 7 with a Centos 6 guest VM set up for hosting my dev server. When I'm connected to my home network the guest can be accessed via a static IP address that I configured (192.168.56.2), but not when I'm in the office. I'm guessing that the DHCP server in the office doesn't have a gateway configured for the 192.168.56.x IP range. I read something about the VB host-only adapter that should allow me to set this guest VM up in such a way that I don't need to be on any network to be able to access the guest from the host using a static IP. I've not been able to find out exactly how to configure this though. Can anyone give me an example configuration, thanks. UPDATE: Thanks for your responses. I've now set up a single virtual network adapter in VirtualBox and set it to host-only: C:\Users\Ben>vboxmanage list hostonlyifs Name: VirtualBox Host-Only Ethernet Adapter GUID: d419ef62-3c46-4525-ad2d-be506c90459a Dhcp: Disabled IPAddress: 192.168.56.2 NetworkMask: 255.255.255.0 IPV6Address: fe80:0000:0000:0000:78e3:b200:5af3:2a57 IPV6NetworkMaskPrefixLength: 64 HardwareAddress: 08:00:27:00:94:e8 MediumType: Ethernet Status: Up VBoxNetworkName: HostInterfaceNetworking-VirtualBox Host-Only Ethernet Adapter On the guest I've set up eth0 to use the same IP address as the host-only adapter (192.168.56.2) but when I try to log in using Putty I still get "Network Error : connection refused". VirtualBox DHCP servier is enabled but I can't ping the gateway (192.168.56.1) from either host nor guest. There's no firewall running on either OS. What next?

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• Metrics - A little knowledge can be a dangerous thing (or 'Why you're not clever enough to interpret metrics data')

  - by Jason Crease

  At RedGate Software, I work on a .NET obfuscator  called SmartAssembly.  Various features of it use a database to store various things (exception reports, name-mappings, etc.) The user is given the option of using either a SQL-Server database (which requires them to have Microsoft SQL Server), or a Microsoft Access MDB file (which requires nothing). MDB is the default option, but power-users soon switch to using a SQL Server database because it offers better performance and data-sharing. In the fashionable spirit of optimization and metrics, an obvious product-management question is 'Which is the most popular? SQL Server or MDB?' We've collected data about this fact, using our 'Feature-Usage-Reporting' technology (available as part of SmartAssembly) and more recently our 'Application Metrics' technology: Parameter Number of users % of total users Number of sessions Number of usages SQL Server 28 19.0 8115 8115 MDB 114 77.6 1449 1449 (As a disclaimer, please note than SmartAssembly has far more than 132 users . This data is just a selection of one build) So, it would appear that SQL-Server is used by fewer users, but more often. Great. But here's why these numbers are useless to me: Only the original developers understand the data What does a single 'usage' of 'MDB' mean? Does this happen once per run? Once per option change? On clicking the 'Obfuscate Now' button? When running the command-line version or just from the UI version? Each question could skew the data 10-fold either way, and the answers only known by the developer that instrumented the application in the first place. In other words, only the original developer can interpret the data - product-managers cannot interpret the data unaided. Most of the data is from uninterested users About half of people who download and run a free-trial from the internet quit it almost immediately. Only a small fraction use it sufficiently to make informed choices. Since the MDB option is the default one, we don't know how many of those 114 were people CHOOSING to use the MDB, or how many were JUST HAPPENING to use this MDB default for their 20-second trial. This is a problem we see across all our metrics: Are people are using X because it's the default or are they using X because they want to use X? We need to segment the data further - asking what percentage of each percentage meet our criteria for an 'established user' or 'informed user'. You end up spending hours writing sophisticated and dubious SQL queries to segment the data further. Not fun. You can't find out why they used this feature Metrics can answer the when and what, but not the why. Why did people use feature X? If you're anything like me, you often click on random buttons in unfamiliar applications just to explore the feature-set. If we listened uncritically to metrics at RedGate, we would eliminate the most-important and more-complex features which people actually buy the software for, leaving just big buttons on the main page and the About-Box. "Ah, that's interesting!" rather than "Ah, that's actionable!" People do love data. Did you know you eat 1201 chickens in a lifetime? But just 4 cows? Interesting, but useless. Often metrics give you a nice number: '5.8% of users have 3 or more monitors' . But unless the statistic is both SUPRISING and ACTIONABLE, it's useless. Most metrics are collected, reviewed with lots of cooing. and then forgotten. Unless a piece-of-data could change things, it's useless collecting it. People get obsessed with significance levels The first things that lots of people do with this data is do a t-test to get a significance level ("Hey! We know with 99.64% confidence that people prefer SQL Server to MDBs!") Believe me: other causes of error/misinterpretation in your data are FAR more significant than your t-test could ever comprehend. Confirmation bias prevents objectivity If the data appears to match our instinct, we feel satisfied and move on. If it doesn't, we suspect the data and dig deeper, plummeting down a rabbit-hole of segmentation and filtering until we give-up and move-on. Data is only useful if it can change our preconceptions. Do you trust this dodgy data more than your own understanding, knowledge and intelligence?  I don't. There's always multiple plausible ways to interpret/action any data Let's say we segment the above data, and get this data: Post-trial users (i.e. those using a paid version after the 14-day free-trial is over): Parameter Number of users % of total users Number of sessions Number of usages SQL Server 13 9.0 1115 1115 MDB 5 4.2 449 449 Trial users: Parameter Number of users % of total users Number of sessions Number of usages SQL Server 15 10.0 7000 7000 MDB 114 77.6 1000 1000 How do you interpret this data? It's one of: Mostly SQL Server users buy our software. People who can't afford SQL Server tend to be unable to afford or unwilling to buy our software. Therefore, ditch MDB-support. Our MDB support is so poor and buggy that our massive MDB user-base doesn't buy it.  Therefore, spend loads of money improving it, and think about ditching SQL-Server support. People 'graduate' naturally from MDB to SQL Server as they use the software more. Things are fine the way they are. We're marketing the tool wrong. The large number of MDB users represent uninformed downloaders. Tell marketing to aggressively target SQL Server users. To choose an interpretation you need to segment again. And again. And again, and again. Opting-out is correlated with feature-usage Metrics tends to be opt-in. This skews the data even further. Between 5% and 30% of people choose to opt-in to metrics (often called 'customer improvement program' or something like that). Casual trial-users who are uninterested in your product or company are less likely to opt-in. This group is probably also likely to be MDB users. How much does this skew your data by? Who knows? It's not all doom and gloom. There are some things metrics can answer well. Environment facts. How many people have 3 monitors? Have Windows 7? Have .NET 4 installed? Have Japanese Windows? Minor optimizations.  Is the text-box big enough for average user-input? Performance data. How long does our app take to start? How many databases does the average user have on their server? As you can see, questions about who-the-user-is rather than what-the-user-does are easier to answer and action. Conclusion Use SmartAssembly. If not for the metrics (called 'Feature-Usage-Reporting'), then at least for the obfuscation/error-reporting. Data raises more questions than it answers. Questions about environment are the easiest to answer.

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• At times, you need to hire a professional.

  - by Phil Factor

  After months of increasingly demanding toil, the development team I belonged to was told that the project was to be canned and the whole team would be fired.  I’d been brought into the team as an expert in the data implications of a business re-engineering of a major financial institution. Nowadays, you’d call me a data architect, I suppose.  I’d spent a happy year being paid consultancy fees solving a succession of interesting problems until the point when the company lost is nerve, and closed the entire initiative. The IT industry was in one of its characteristic mood-swings downwards.  After the announcement, we met in the canteen. A few developers had scented the smell of death around the project already hand had been applying unsuccessfully for jobs. There was a sense of doom in the mass of dishevelled and bleary-eyed developers. After giving vent to anger and despair, talk turned to getting new employment. It was then that I perked up. I’m not an obvious choice to give advice on getting, or passing,  IT interviews. I reckon I’ve failed most of the job interviews I’ve ever attended. I once even failed an interview for a job I’d already been doing perfectly well for a year. The jobs I’ve got have mostly been from personal recommendation. Paradoxically though, from years as a manager trying to recruit good staff, I know a lot about what IT managers are looking for.  I gave an impassioned speech outlining the important factors in getting to an interview.  The most important thing, certainly in my time at work is the quality of the résumé or CV. I can’t even guess the huge number of CVs (résumés) I’ve read through, scanning for candidates worth interviewing.  Many IT Developers find it impossible to describe their  career succinctly on two sides of paper.  They leave chunks of their life out (were they in prison?), get immersed in detail, put in irrelevancies, describe what was going on at work rather than what they themselves did, exaggerate their importance, criticize their previous employers, aren’t  aware of the important aspects of a role to a potential employer, suffer from shyness and modesty,  and lack any sort of organized perspective of their work. There are many ways of failing to write a decent CV. Many developers suffer from the delusion that their worth can be recognized purely from the code that they write, and shy away from anything that seems like self-aggrandizement. No.  A resume must make a good impression, which means presenting the facts about yourself in a clear and positive way. You can’t do it yourself. Why not have your resume professionally written? A good professional CV Writer will know the qualities being looked for in a CV and interrogate you to winkle them out. Their job is to make order and sense out of a confused career, to summarize in one page a mass of detail that presents to any recruiter the information that’s wanted. To stand back and describe an accurate summary of your skills, and work-experiences dispassionately, without rancor, pity or modesty. You are no more capable of producing an objective documentation of your career than you are of taking your own appendix out.  My next recommendation was more controversial. This is to have a professional image overhaul, or makeover, followed by a professionally-taken photo portrait. I discovered this by accident. It is normal for IT professionals to face impossible deadlines and long working hours by looking more and more like something that had recently blocked a sink. Whilst working in IT, and in a state of personal dishevelment, I’d been offered the role in a high-powered amateur production of an old ex- Broadway show, purely for my singing voice. I was supposed to be the presentable star. When the production team saw me, the air was thick with tension and despair. I was dragged kicking and protesting through a succession of desperate grooming, scrubbing, dressing, dieting. I emerged feeling like “That jewelled mass of millinery, That oiled and curled Assyrian bull, Smelling of musk and of insolence.” (Tennyson Maud; A Monodrama (1855) Section v1 stanza 6) I was then photographed by a professional stage photographer.  When the photographs were delivered, I was amazed. It wasn’t me, but it looked somehow respectable, confident, trustworthy.   A while later, when the show had ended, I took the photos, and used them for work. They went with the CV to job applications. It did the trick better than I could ever imagine.  My views went down big with the developers. Old rivalries were put immediately to one side. We voted, with a show of hands, to devote our energies for the entire notice period to getting employable. We had a team sourcing the CV Writer,  a team organising the make-overs and photographer, and a third team arranging  mock interviews. A fourth team determined the best websites and agencies for recruitment, with the help of friends in the trade.  Because there were around thirty developers, we were in a good negotiating position.  Of the three CV Writers we found who lived locally, one proved exceptional. She was an ex-journalist with an eye to detail, and years of experience in manipulating language. We tried her skills out on a developer who seemed a hopeless case, and he was called to interview within a week.  I was surprised, too, how many companies were experts at image makeovers. Within the month, we all looked like those weird slick  people in the ‘Office-tagged’ stock photographs who stare keenly and interestedly at PowerPoint slides in sleek chromium-plated high-rise offices. The portraits we used still adorn the entries of many of my ex-colleagues in LinkedIn. After a months’ worth of mock interviews, and technical Q&A, our stutters, hesitations, evasions and periphrastic circumlocutions were all gone.  There is little more to relate. With the résumés or CVs, mugshots, and schooling in how to pass interviews, we’d all got new and better-paid jobs well  before our month’s notice was ended. Whilst normally, an IT team under the axe is a sad and depressed place to belong to, this wonderful group of people had proved the power of organized group action in turning the experience to advantage. It left us feeling slightly guilty that we were somehow cheating, but I guess we were merely leveling the playing-field.

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• Re-ordering child nodes in django-MPTT

  - by Dominic Rodger

  I'm using Ben Firshman's fork of django-MPTT (hat tip to Daniel Roseman for the recommendation). I've got stuck trying to re-order nodes which share a common parent. I've got a list of primary keys, like this: ids = [5, 9, 7, 3] All of these nodes have a parent, say with primary key 1. At present, these nodes are ordered [5, 3, 9, 7], how can I re-order them to [5, 9, 7, 3]? I've tried something like this: last_m = MyModel.get(pk = ids.pop(0)) last_m.move_to(last_m.parent, position='first-child') for id in ids: m = MyModel.get(pk = id) m.move_to(last_m, position='right') Which I'd expect to do what I want, per the docs on move_to, but it doesn't seem to change anything. Sometimes it seems to move the first item in ids to be the first child of its parent, sometimes it doesn't. Am I right in my reading of the docs for move_to that calling move_to on a node n with position=right and a target which is a sibling of n will move n to immediately after the target? It's possible I've screwed up my models table in trying to figure this out, so maybe the code above is actually right. It's also possible there's a much more elegant way of doing this (perhaps one that doesn't involve O(n) selects and O(n) updates). Have I misunderstood something? Bonus question: is there a way of forcing django-MPTT to rebuild lft and rght values for all instances of a given model?

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• Possible to change the alpha value of certain pixels on iPhone?

  - by emi1faber

  Is it possible to change just a portion of a Sprite's alpha in response to user interaction? A good example of what I mean is iFog or iSteam, where the user can wipe "steam" off the iPhone's screen. Swapping images out wouldn't be feasible due to the sheer number of possibilities where the user could touch and move... For example, say you have a simple app that has a brick wall in the background that has graffiti on it, so there'd be two sprites, one of the brick wall, then one of the graffiti that has a higher z value than the brick wall. Then, based upon where the user touches (assuming their touch controls a sandblaster), some of the graffiti should be removed, but not all of it, which could be accomplished by changing the alpha value on a portion of the graffiti sprite. Is there any way to do this in cocos2d-iphone? Or, do I need to drop down into openGL, and if so, where would be a good place to start my search on how to accomplish this? Ideally, I'd like to accomplish this on a cocos2d-iphone Sprite, but if it's not possible, where's the best place to start looking? Thanks in advance, Ben

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• Blackberry MDS simulator - Can't connect to the internet in the simulator.

  - by bcoyour

  I'm trying to do some testing of a website through the Blackberry simulator, while the simulator works fine, I can't get to any sites in the Blackberry Browser. Here is the specific setup I'm using. I'm Windows 7 (64-bit) Home Edition I have the latest (at the time) MDS installation - BlackBerry Email and MDS Services Simulators 4.1.4 Finally, I have the latest (at the time) Blackberry Simulator - BlackBerry Smartphone Simulators 5.0.0 (5.0.0.442) - 9700 I first start the MDS service, it briefly pops up the command-prompt and then closes it. I'm assuming that when it does that, it started the MDS service. Then I open the Blackberry simulator (9700), which opens up fine and loads the Blackberry OS. Then with the Blackberry OS all loaded up, I navigate to the browser and for example type www.google.com and then at the bottom it just says "sending request" and loads for about a minute. Then times out and says it can't find a connection. Anyone have any thoughts on what I'm missing? Or, does anyone know of an online simulator for the Blackberry, because thus far this has been a huge pain for testing sites on a Blackberry. Thank you! Ben

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• AMF data is incomplete with Flex Service

  - by Tom

  Hello everybody. I am bussy with a Flex Project with a data services. Flash builder installed Zend Framework with Zend_Amf. When i run the project i get the error NetConnection.Call.Failed: HTTP: Failed. With chalers i say that Zend_Amf give the error: AMF data is incomplete (0 bytes of 0 bytes). Please check the recording limits in the Recording Settings. I don't know what the problem means. I have searched on google, but i haven't found a good result. The Flex project code is: <?xml version="1.0" encoding="utf-8"?> <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600" xmlns:authservice="services.authservice.*"> <fx:Script> <![CDATA[ import mx.controls.Alert; protected function click_me_clickHandler(event:MouseEvent):void { text.text += "Test started"; testmeResult.token = authService.testme(); text.text += testmeResult.lastResult text.text += "Test ended"; } ]]> </fx:Script> <fx:Declarations> <s:CallResponder id="testmeResult"/> <authservice:AuthService id="authService" fault="Alert.show(event.fault.faultString + '\n' + event.fault.faultDetail)" showBusyCursor="true"/> <!-- Place non-visual elements (e.g., services, value objects) here --> </fx:Declarations> <s:Button x="124" y="85" label="Click Me!" id="click_me" click="click_me_clickHandler(event)"/> <s:RichText x="58" y="114" width="238" height="182" id="text"/> </s:Application> The php code is: <?php class AuthService { public function testme() { return 'ik ben getest op'+date('d-m-Y H:i:s', time()); } }?> Please, help me!

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• Copy data from different worksheet to a master worksheet but no duplicates

  - by sam

  hi all, i want to clarify my initial question for a possible solutions from any savior out there. Say i have 3 excel sheets one for each user for data entry located in separate workbooks to avoid excel share workbook problems. I also have a master sheet in another workbook where i want individual data enter on those sheets precisely sheets 1 should copy to the next available row of sheet 1 in the master sheet as the users enter them. i need a vba code that can copy each record without copying a duplicate row in the master sheet but highlight the duplicate row and lookup the initial record in a master sheet and return the name of the Imputer looking up the row say column ( I) where each user sign there initials after every row of entry like below. All 4 worksheets are formatted as below: lastname account cardno. type tran amount date location comments initials JAME 65478923 1975 cash 500 4/10/2010 miles st. this acct is resolve MLK BEN 52436745 1880 CHECK 400 4/12/2010 CAREY ST Ongoing investigation MLK JAME 65478923 1975 cash 500 4/10/2010 miles st. this acct is resolve MLK I need the vba to recognize duplicates only if the account number and the card number matches the initial records. So if the duplicates exist a pop up message should be display that a duplicates exist and return the initial Imputer say MLK in COLUMN( I) to any user inputting in the individual worksheets other than warehouse sheets (master). So please any idea will be appreciated.

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• Why can't I set boolean columns with update?

  - by Benjamin Oakes

  I'm making a user administration page. For the system I'm creating, users need to be approved. Sometimes, there will be many users to approve, so I'd like to make that easy. I'm storing this as a boolean column called approved. I remembered the Edit Multiple Individually Railscast and thought it would be a great fit. However, I'm running into problems which I traced back to ActiveRecord::Base#update. update works fine in this example: >> User.all.map(&:username) => ["ben", "fred"] >> h = {"1"=>{'username'=>'benjamin'}, "2"=>{"username"=>'frederick'}} => {"1"=>{"username"=>"benjamin"}, "2"=>{"username"=>"frederick"}} >> User.update(h.keys, h.values) => ... >> User.all.map(&:username) => ["benjamin", "frederick"] But not this one: >> User.all.map(&:approved) => [true, nil] >> h = {"1"=>{'approved'=>'1'}, "2"=>{'approved'=>'1'}} >> User.update(h.keys, h.values) => ... >> User.all.map(&:approved) => [true, nil] Chaging from '1' to true didn't make a difference when I tested. What am I doing wrong?

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• Finding values from a table that are *not* in a grouping of another table and what group that value

  - by Bkins

  I hope I am not missing something very simple here. I have done a Google search(es) and searched through stackoverflow. Here is the situation: For simplicity's sake let's say I have a table called "PeoplesDocs", in a SQL Server 2008 DB, that holds a bunch of people and all the documents that they own. So one person can have several documents. I also have a table called "RequiredDocs" that simply holds all the documents that a person should have. Here is sort of what it looks like: PeoplesDocs: PersonID DocID -------- ----- 1 A 1 B 1 C 1 D 2 C 2 D 3 A 3 B 3 C RequiredDocs: DocID DocName ----- --------- A DocumentA B DocumentB C DocumentC D DocumentD How do I write a SQL query that returns some variation of: PersonID MissingDocs -------- ----------- 2 DocumentA 2 DocumentB 3 DocumentD I have tried, and most of my searching has pointed to, something like: SELECT DocID FROM DocsRequired WHERE NOT EXIST IN ( SELECT DocID FROM PeoplesDocs) but obviously this will not return anything in this example because everyone has at least one of the documents. Also, if a person does not have any documents then there will be one record in the PeoplesDocs table with the DocID set to NULL. Thank you in advance for any help you can provide, Ben

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• Java mail attachment not working on Tomcat

  - by losintikfos

  Hello guys, I have an application which e-mails confirmations. The email part utilises Commons Mail API. The simple code which does the send mail is as shown below; import org.apache.commons.mail.*; ... // Create the attachment EmailAttachment attachment = new EmailAttachment(); attachment.setURL(new URL("http://cashew.org/doc.pdf")); attachment.setDisposition(EmailAttachment.ATTACHMENT); attachment.setDescription("Testing attach"); attachment.setName("doc.pdf"); // Create the email message MultiPartEmail email = new MultiPartEmail(); email.setHostName("mail.cashew.com"); email.addTo("[email protected]"); email.setFrom("[email protected]"); email.setSubject("Testing); email.setMsg("testing message"); // add the attachment email.attach(attachment); // send the email email.send(); My problem is, when I execute this application from Eclipse, I get email sent with attachment without any issues. But when i deploy the application to Tomcat server (I have tried both version 5 & 6 no joy), the e-mail is sent with below content; ------=_Part_0_25002283.1275298567928 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit testing Regards, los ------=_Part_0_25002283.1275298567928 Content-Type: application/pdf; name="doc.pdf" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="doc.pdf" Content-Description: Testing attach JVBERi0xLjQNJeLjz9MNCjYzIDAgb2JqDTw8L0xpbmVhcml6ZWQgMS9MIDMxMzE4Mi9PIDY1L0Ug Mjg2NjY5L04gMS9UIDMxMTgwMi9IIFsgMjgzNiAzNzZdPj4NZW5kb2JqDSAgICAgICAgICAgICAg DQp4cmVmDQo2MyAxMjcNCjAwMDAwMDAwMTYgMDAwMDAgbg0KMDAwMDAwMzM4MCAwMDAwMCBuDQow MDAwMDAzNTIzIDAwMDAwIG4NCjAwMDAwMDQzMDcgMDAwMDAgbg0KMDAwMDAwNTEwOSAwMDAwMCBu DQowMDAwMDA2Mjc5IDAwMDAwIG4NCjAwMDAwMDY0MTAgMDAwMDAgbg0KMDAwMDAwNjU0NiAwMDAw MCBuDQowMDAwMDA3OTY3IDAwMDAwIG4NCjAwMDAwMDkwMjMgMDAwMDAgbg0KMDAwMDAwOTk0OSAw MDAwMCBuDQowMDAwMDExMDAwIDAwMDAwIG4NCjAwMDAwMTIwNTkgMDAwMDAgbg0KMDAwMDAxMjky MCAwMDAwMCBuDQowMDAwMDEyOTU0IDAwMDAwIG4NCjAwMDAwMTI5ODIgMDAwMDAgbg0KMDAwMDAx ....... CnN0YXJ0eHJlZg0KMTE2DQolJUVPRg0K ------=_Part_0_25002283.1275298567928-- One thing also I have noticed is, the header information donot show TO and Subject values. Hmm pretty wierd. I have to point out that, above is not generated of DEBUG, it is the actual message recieved in my outlook client. Can someone help me please! Do anyone knows what's going on?

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• Database sharing/versioning

  - by DarkJaff

  Hi everyone, I have a question but I'm not sure of the word to use. My problem: I have an application using a database to stock information. The database can ben in access (local) or in a server (SQL Server or Oracle). We support these 3 kind of database. We want to give the possibility to the user to do what I think we can call versioning. Let me explain : We have a database 1. This is the master. We want to be able to create a database 2 that will be the same thing as database 1 but we can give it to someone else. They each work on each other side, adding, modifying and deleting records on this very complex database. After that, we want the database 1 to include the change from database 2, but with the possibility to dismiss some of the change. For you information, ou application is already multiuser so why don't we just use this multi-user and forget about this versionning? It's because sometimes, we need to give a copy of the database to another company on another site and they can't connect on our server. They work on their side and then, we want to merge. Is there anyone here with experience with this type of requirement? We have a lot of ideas but most of them require a LOT of work, massive modification to the database or to the existing queries. This is a 2 millions and growing C++ app, so rewriting it is not possible! Thanks for any ideas that you may give us! J-F

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• NSDate out of scope

  - by therealtkd

  Having problems with out of scope for NSDate in an iphone app. I have an interface defined like this: @interface MyObject : NSoObject { NSMutableArray *array; BOOL checkThis; NSDate *nextDue; } Now in the implementation I have this: -(id) init { if( (self=[super init]) ) { checkThis = NO; array = [[NSMutableArray alloc] init]; nextDue = [[NSDate date] retain]; NSDate *testDate = [NSDate date]; } return self; } Now, if I trace through the init, before I actually assign the variables checkThis shows as boolean. array shows as pointer 0x0 because it hasn't ben assigned. But the nextDue is showing as 'out of scope'. I don't understand why this is out of scope but the other variables aren't. If I trace through the code until after the variables are assigned, array now shows as being correctly assigned but nextDue is still out of scope. Interestingly, the testDate variable is assigned just fine and the debugger shows this as a valid date. Further interesting point is if I move the mouse over the testDate variable while I am debugging, it shows as an 'NSDate *' type which I would expect since that's its definition. Yet the nextDue, which to me is defined the same way is showing as a '_NSCFDate *'. Any googling I did on the subject said that the retain is the problem, but its actually out of scope before I even try to assign the variable. However, in another class, the same definition for NSDate work ok. It shows as nil before a value is assigned to it. Arghhh

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• Predefined column names in SQL Server pivot table

  - by Marcos Buarque

  Hi, the other day I opened a topic here in StackOverflow (stackoverflow.com/questions/4663698/how-can-i-display-a-consolidated-version-of-my-sql-server-table). At that time I needed help on how to show data on a pivot table. From the help I got here in the forum, my research led me to this page about dynamic SQL: www.sommarskog.se/dynamic_sql.html. And then it led me to this awesome SQL script by Itzik Ben-Gan that will create a stored procedure that outputs a pivot table exactly the way I want: sommarskog.se/pivot_sp.sp. Well, almost. I need one change in this stored procedure. Instead of having dynamic column names pulled from the @on_cols variable in the SPROC, I need the output table to hold generic column names in simple ASC order. Could be, for example, col1, col2, col3, col4 ... The dynamic column names are a problem for me. So I need them named by their index in the order they appear. I have tried all sorts of things changing this great SQL script, but it won't work. I did not paste the code from the author because it is too long, but the link above will get us there. Any help appreciated. Thank you very much

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• What version of .NET containing RuntimeMethodHandle.EmptyHandle?

  - by user299990

  No one answers my question in http://stackoverflow.com/questions/1295344/difference-between-activator-createinstance-and-typeoft-invokemember-with-b/2500960#2500960. I guess that the issue is closed and I am asking here again. Ben M have a nice function which I need for a project. The function is - public static T CreateInstance() { bool bNeedSecurityCheck = true; bool canBeCached = false; RuntimeMethodHandle emptyHandle = RuntimeMethodHandle.EmptyHandle; return (T) RuntimeTypeHandle.CreateInstance(typeof(T) as RuntimeType, true, true, ref canBeCached, ref emptyHandle, ref bNeedSecurityCheck); } I am using .NET 3.5 and Visual studio 2008. It gives the error "EmptyHandle type name does not exist in the type System.RuntimeMethodHandle". Then I used "RuntimeMethodHandle emptyHandle = new RuntimeMethodHandle();". Another error presents. RuntimeTypeHandle does not have a CreateInstance method either. Activator has. But it does not take any ref parameter. Thanks for clarification in advance!

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• Anyone know exactly which JMS messages will be redelivered in CLIENT_ACKNOWLEDGE mode if the client

  - by user360612

  The spec says "Acknowledging a consumed message automatically acknowledges the receipt of all messages that have been delivered by its session" - but what I need to know is what it means by 'delivered'. For example, if I call consumer.receive() 6 times, and then call .acknowledge on the 3rd message - is it (a) just the first 3 messages that are ack'd, or (b) all 6? I'm really hoping it's option a, i.e. messages after the one you called acknowledge on WILL be redelivered, otherwise it's hard to see how you could prevent message lost in the event of my receiver process crashing before I've had a chance to persist and acknowledge the messages. But the spec is worded such that it's not clear. I get the impression the authors of the JMS spec considered broker failure, but didn't spend too long thinking about how to protect against client failure :o( Anyway, I've been able to test with SonicMQ and found that it implements (a), i.e. messages 'received' later than the message you call .ack on DO get redelivered in the event of a crash, but I'd love to know how other people read the standard, and if anyone knows how any other providers have implemented CLIENT_ACKNOWLEDGE? (i.e. what the 'de facto' standard is) Thanks Ben

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• Twitter API Rate Limit - Overcoming on an unauthenticated JSON Get with Objective C?

  - by Cian

  I see the rate limit is 150/hr per IP. This'd be fine, but my application is on a mobile phone network (with shared IP addresses). I'd like to query twitter trends, e.g. GET /trends/1/json. This doesn't require authorization, however what if the user first authorized with my application using OAuth, then hit the JSON API? The request is built as follows: - (void) queryTrends:(NSString *) WOEID { NSString *urlString = [NSString stringWithFormat:@"http://api.twitter.com/1/trends/%@.json", WOEID]; NSURL *url = [NSURL URLWithString:urlString]; NSURLRequest *theRequest=[NSURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10.0]; NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self startImmediately:YES]; if (theConnection) { // Create the NSMutableData to hold the received data. theData = [[NSMutableData data] retain]; } else { NSLog(@"Connection failed in Query Trends"); } //NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:urlString]]; } I have no idea how I'd build this request as an authenticated one however, and haven't seen any examples to this effect online. I've read through the twitter OAuth documentation, but I'm still puzzled as to how it should work. I've experimented with OAuth using Ben Gottlieb's prebuild library, and calling this in my first viewDidLoad: OAuthViewController *oAuthVC = [[OAuthViewController alloc] initWithNibName:@"OAuthTwitterDemoViewController" bundle:[NSBundle mainBundle]]; // [self setViewController:aViewController]; [[self navigationController] pushViewController:oAuthVC animated:YES]; This should store all the keys required in the app's preferences, I just need to know how to build the GET request after authorizing! Maybe this just isn't possible? Maybe I'll have to proxy the requests through a server side application? Any insight would be appreciated!

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