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  • Decisions in teaching someone else to program: language selection

    - by Dinah
    My friend would like for me to guide her into learning programming. She's already proven enormous aptitude for thinking like a programmer but is scared of the idea of programming since in her mind it's relegated to some magical realm accessible only to smart people and trained computer scientists (ironically, I am neither but that's beside the point). My main question is the age-old and irritating question: which language should I chose? I've limited it down to these: PHP: dead simple to start with and I remember enough of the language to answer all novice questions. However, I can think of a million reasons why I wouldn't recommend this as a first language. The most diplomatic of which is that there's no desktop app option to which I would feel comfortable subjecting a novice. Python: supposed to be wonderful for beginners and generally everything I've heard about it screams that this is the correct choice. That's the problem: everything I've heard about it. I don't know it yet and have a lot of projects going on right now so I don't feel like learning it yet -- but I'm going to be the tech-support when any little thing goes wrong. I know there are tons of online resources but in the frustration of the moment, it's always going to be just me. C#: this is the language I'm most comfortable with so I know I can be good tech support. I also love this language and its versatility and community. The big drawback here is that I remember when I first learned it after doing mainly PHP, Perl, and JavaScript and I found the experience overwhelming. You are simultaneously learning: programming concepts, C# syntax, strong typing, OOP, and a complex powerful IDE with a bazillion options and buttons all over it.

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  • rvmsudo foreman export upstart without asking for password

    - by Millisami
    My capistrano deploy.rb has a foreman export command for a rails app on Ubuntu 10.04 So, while deploying, I want to export the foreman to upstart script. But doing that, the command rvmsudo foreman export ... asks for root password and I cannot do anything. Googled a lot and tried with various tweaks but nothing worked. * executing `foreman:export' * executing "cd /home/deploy/zappy/releases/20111019175422 && rvmsudo foreman export upstart /etc/init -a zappy -u deploy -f ./Procfile.production -c worker=1 redis=1 -l /home/deploy/zappy/releases/20111019175422/log/foreman" servers: ["173.255.205.237"] [173.255.205.237] executing command ** [out :: 173.255.205.237] [sudo] password for deploy: What could be the solution to do it password-less way?

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  • AndEngine VS Android's Canvas VS OpenGLES - For rendering a 2D indoor vector map

    - by Orchestrator
    This is a big issue for me I'm trying to figure out for a long time already. I'm working on an application that should include a 2D vector indoor map in it. The map will be drawn out from an .svg file that will specify all the data of the lines, curved lines (path) and rectangles that should be drawn. My main requirement from the map are Support touch events to detect where exactly the finger is touching. Great image quality especially when considering the drawings of curved and diagonal lines (anti-aliasing) Optional but very nice to have - Built in ability to zoom, pan and rotate. So far I tried AndEngine and Android's canvas. With AndEngine I had troubles with implementing anti-aliasing for rendering smooth diagonal lines or drawing curved lines, and as far as I understand, this is not an easy thing to implement in AndEngine. Though I have to mention that AndEngine's ability to zoom in and pan with the camera instead of modifying the objects on the screen was really nice to have. I also had some little experience with the built in Android's Canvas, mainly with viewing simple bitmaps, but I'm not sure if it supports all of these things, and especially if it would provide smooth results. Last but no least, there's the option of just plain OpenGLES 1 or 2, that as far as I understand, with enough work should be able to support all the features I require. However it seems like something that would be hard to implement. And I've never programmed in OpenGL or anything like it, but I'm willing very much to learn. To sum it all up, I need a platform that would provide me with the ability to do the 3 things I mentioned before, but also very important - To allow me to implement this feature as fast as possible. Any kind of answer or suggestion would be very much welcomed as I'm very eager to solve this problem! Thanks!

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  • Migrating to OSGi?

    - by Paul McKenzie
    We're currently running server-side java apps on windows using JavaServiceWrapper and this has been a good solution for us. We have a small number of Spring-based lightweight applications. But now we need to look at introducing some modularity into our services. To that end I have been thinking about OSGi. I need to know which OSGi containers are ready for prime-time production use in a medium-ish load environment? Eclipse Equinox 3.5.xKnopflerfish 3.xApache Felix 2.xAnything else?

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  • Android ViewPager Displaying TextView in Layout

    - by Ammonious
    I'm having a problem getting my viewpager to work correctly. Currently the bottom part of my layout will page across but the remaining part will not Here's my code that I have in my PageAdapter public class MyPageAdapter extends PagerAdapter { public int getCount() { return 31; } public Object instantiateItem(View collection, int position) { LayoutInflater inflater = (LayoutInflater) collection.getContext() .getSystemService(Context.LAYOUT_INFLATER_SERVICE); int resId = 0; switch (position) { case 0: resId = R.layout.main_menu; break; case 1: resId = R.layout.article1; break; case 2: resId = R.layout.article2; break; .... .... View view = inflater.inflate(resId, null); ((ViewPager) collection).addView(view, 0); return view; This is what I have for my XML <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:background="@drawable/background" android:clickable="true" android:id="@+id/layout13" android:weightSum="0"> <TextView android:id="@+id/textView01" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center_vertical|center_horizontal" android:padding="12dp" android:text="@string/article13" android:textAppearance="?android:attr/textAppearanceLarge" android:textColor="#000000" /> <TextView android:id="@+id/textView02" android:layout_width="match_parent" android:layout_height="302dp" android:gravity="center_vertical|center_horizontal" android:text="@string/body13" android:textAppearance="?android:attr/textAppearanceLarge" android:textColor="#000000" /> <android.support.v4.view.ViewPager android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@id/viewPager" > </android.support.v4.view.ViewPager> </LinearLayout> I've tried Moving the around in my XML layout to right underneath my LinearLayout and i get the full screen but all my text disappears. It's probably something simple i'm missing but any help on this would be greatly appreciated!

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  • How can I log and retrieve error messages from a client-side desktop app?

    - by KeyboardMonkey
    Update: The service-based answers below are most likely the way to go, I am also curious to see if there are any out-the-box solutions anyone has tried in the field. Our system uses a client-server architecture, and with more clients using it I'm thinking of better ways to log client application errors, and get them sent to us. Currently we just show a simple error message, with a button that preps an email (with the default system email client) and the clients send this on to our support address. This contains extra info like the stack trace. We also tried saving errors to a network share in the company, but I'm not too keen on that archaic solution either. Now there are only two businesses that refer to clients as users, and I'm sure some of ours support both lifestyles, as they just ignore the email button, and sends a full screen-shot wrapped nicely in a word document. Some factors I'm thinking of include A solution to log errors, like the contrived one above, A robust solution; Logging to a SQL database won't work; if that fails too, then what? Is at least semi-automated, preferably to the point where the logs reach my side. It copes with load, our client base is growing and the current solution, and our inboxes, won't hold up. Minimise installing extra 3rd party components on clients, I want to keep the SPOF to a min. I'd love to hear about any experience or suggestions you have on how I can implement such a solution. System Details It's a Microsoft .Net 2 based system with a SQL backend. Some users work remotely over the net, so network shares aren't always available (unless they VPN, which is awesomely slow at any rate). We have users across different companies, their DB's are hosted on-site. We have remote access to 90% of them.

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  • Redmine on Redhat/CentOS 5 Without using virtual hosts

    - by flyclassic
    I've have followed all the steps to install Redmine on CentOS 5, except for the Apache part: http://www.redmine.org/projects/redmine/wiki/HowTo_install_Redmine_on_CentOS_5 I do not want to configure a virtualhost as we are not using virtual hosts. Can I configure Redmine to run with http://hostname/redmine? Apparently it doesn't work for my case. Redmine was extracted in to the webserver document root /var/www/html/ called /var/www/html/redmine What I did was added a redmine.conf to /etc/httpd/conf.d/ with the following configuration and restarted the server: <Location "/redmine"> Options Indexes ExecCGI FollowSymLinks -MultiViews Order allow,deny Allow from all AllowOverride all PassengerEnabled On RailsBaseURI /var/www/html/redmine RailsEnv production </Location> now i got this error Further information about the error may have been written to the application's log file. Please check it in order to analyse the problem. Error message: No such file or directory - config/environment.rb Exception class: Errno::ENOENT Application root: /var/www/html Where have I gone wrong?

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  • Parralelization in Microsoft SQL Server 2008 R2

    - by stan31337
    We have a specific accounting and production software, called 1C, which uses single user connection to the MS SQL 2008 R2 database. And there are about 500 users connecting to 1C server to perform their tasks. 1C and SQL 2008 are on separate servers. How to configure MS SQL 2008 R2 to effectively use parallelization in this configuration? We have 24 cores, and only one is loaded at 100% at MS SQL 2008 R2 server. We have already configured MS SQL max parallelizm from this MSDN article: http://msdn.microsoft.com/en-us/library/ms181007(v=sql.105).aspx Thank you!

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  • Nexus One & Windows XP USB Driver

    - by Stefan
    I've been unable to get my Nexus One working as a development phone on Windows XP. I've got the driver (revision 3 for N1 support), I've got it installed according to the official installation guide, and the phone appears in the Device Manager just as the guide says it should. However, adb still can't find the phone. 'adb devices', for example, returns no active devices. Am I forgetting some basic step? One thing I've noticed is that the driver is labeled in Windows as version 2 released November, 2009 (I need version 3 from January 2010 for N1 support). However, I've never had version 2 installed. I've used the SDK to download version 3 several times - even deleted it and redownloaded it. I've uninstalled/reinstalled the version 3 driver multiple times. It still says version 2. Is this the problem, or this something completely unrelated? Note: The phone is working as a dev phone on Ubuntu, so I know the phone/cable/etc. are good. It's either my fault or the driver's.

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  • How to download source, modify source, recompile and build .deb package?

    - by burnersk
    I have to customize my Apache2 suExec module to ensure some special environment variables getting passed through suExec. How to download the source code form Debian package apache2-suexec, modify suexec.c - safe_env_lst, recompile and build a .deb package again to rollout on the production systems? I tried apt-get source apache2-suexec but didn't found the suexec.c within the occurred apache2-* folder. The altered source code should be like this: static const char *const safe_env_lst[] = { /* variable name starts with */ "HTTP_", "SSL_", /* NEW: Perl debugging variables */ "PERL5OPT=", "PERL5LIB=", "PERLDB_OPTS=", "DBGP_IDEKEY=", /* NEW: FCGI variables */ "FCGI=", "FCGI_CONNECTION=", "FCGI_RUNTIME=", "FCGI_STARTTIME=", draft based on: http://static.askapache.com/httpd/support/suexec.c

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  • Migrating RAID6 array from HP SmartArray P600 to LSI MegaRAID SAS 8888ELP

    - by MLu
    My customer has an external RAID6 array (8x 1TB in HP MSA60 enclosure) attached to HP SmartArray P600 controller. They have now decided to replace the server and the new one comes with LSI MegaRAID SAS 8888ELP. The HW supplier insists the migration is as simple as pulling the eSATA cable from P600 and inserting it into LSI but I'm not convinced. Unfortunately I have nowhere to test, and will have to do the exercise on the production array :( So the question in brief - is it possible to import the HP SmartArray P600-created RAID6 array to LSI MegaRAID 8888ELP?

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  • Apache disable DNS lookups

    - by odeceixe
    I'm using Debian 4.3.2-1 and Apache 2 on my production server. Watching the logs, I noticed Apache is resolving client's hostnames even with HostnameLookups Off in apache2.conf. I want to avoid these lookups so I'm guessing Apache is making this DNS query because I have mod_authz_host enabled. When I try to unlink this module, I get several modules complaining because they use the Order directive. How is the clean way to go? Should I comment all Order directives like Order allow,deny Deny from all Is this the only way to stop Apache from making DNS requests? I would like to deny access to .htaccess files and some rules like that.

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  • 64bit or 32bit Linux system?

    - by Milan Babuškov
    I have a server that has 4GB of RAM. On it, I have installation of 32bit Slackware Linux 12.1. Of course, it is not using all of 4GB of RAM. I'd soon like to increase the RAM to 8GB, and am looking for a way for the system to use it. The system is used as a database server and is under high load during the day. AFAICT, I have two options: stay with 32bit and rebuild the kernel and lose some performance. Or go with 64bit and reinstall everything. Looking at 64bit versions of Slackware, I could run -current or Slamd64. Now, on to the questions: Should I stay with 32bit or go with 64bit? If I go 64bit, should I use -current or Slamd64? P.S. I hope to get answers from someone actually using any of these configurations in production, not just copy/paste something I could find myself via Google.

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  • Hibernate - Batch update returned unexpected row count from update: 0 actual row count: 0 expected:

    - by Sujee
    Hi All, I get following hibernate error. I am able to identify the function which causes the issue. Unfortunately there are several DB calls in the function. I am unable to find the line which causes the issue since hibernate flush the session at the end of the transaction. The below mentioned hibernate error looks like a general error. it doesn't even mentioned which Bean causes the issue. Anyone familiar with this hibernate error? Looking forward your help. Thanks in advance. Sujee. org.hibernate.StaleStateException: Batch update returned unexpected row count from update: 0 actual row count: 0 expected: 1 at org.hibernate.jdbc.BatchingBatcher.checkRowCount(BatchingBatcher.java:93) at org.hibernate.jdbc.BatchingBatcher.checkRowCounts(BatchingBatcher.java:79) at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:58) at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:195) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:235) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:142) at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:297) at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27) at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:985) at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:333) at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106) at org.springframework.orm.hibernate3.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:584) at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransacti onManager.java:500) at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManag er.java:473) at org.springframework.transaction.interceptor.TransactionAspectSupport.doCommitTransactionAfterReturning(Transaction AspectSupport.java:267) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:170) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:176)

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  • CentOS - PHP - Yum Install with Custom ./configure params

    - by Mike Purcell
    I have successfully configured and compiled php on my dev server, and works great, but after talking to a sysadmin buddy, he informed that custom compiles of the latest builds are not recommended for production (or even development) systems. He noted a situation where they custom configured and compiled PHP 5.3.6, only to find that there was some issue with a low-level Postgres driver, so they had to revert back to 5.3.3. So I am considering going back to yum to install PHP, however I have several custom configuration settings and was wondering if it's possible to pass or configure how PHP will be compiled through YUM? My current configure line: Configure Command => './configure' '--with-libdir=lib64' '--prefix=/usr/local/_custom/app/php' '--with-config-file-path=/usr/local/_custom/app/php/etc' '--with-config-file-scan-dir=/usr/local/_custom/app/php/etc/modules' '--disable-all' '--with-apxs2=/usr/sbin/apxs' '--with-curl=/usr/sbin/curl' '--with-gd' '--with-iconv' '--with-jpeg-dir=/usr/lib' '--with-mcrypt=/usr/bin' '--with-pcre-regex' '--with-pdo-mysql=mysqlnd' '--with-png-dir=/usr/lib' '--with-zlib' '--enable-ctype' '--enable-dom' '--enable-hash' '--enable-json' '--enable-libxml' '--enable-mbstring' '--enable-mbregex' '--enable-pdo' '--enable-session' '--enable-simplexml' '--enable-xml' '--enable-xmlreader' '--enable-xmlwriter'

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  • Crosstab/Cube/Pivot Components for Delphi

    - by Anagoge
    I'm looking for a Delphi VCL crosstab/cube/pivotcube/olap grid component for Delphi 2009, 2010, or XE. I'm willing to sacrifice advanced features to get something open/free (or very cheap if I must) to make it easier to collaborate with any future developers without anyone having to purchase more components than I already use, since this will just be used in one screen. If there isn't anything appropriate out there, I may try to implement something simple on my own. I can live with some fairly basic features: drag and drop to configure dimensions, sort by a column, allow totals/min/max for a column, and (optionally) expand/collapse or drill down to sub-categories. Blazing performance and enterprise scalability are not required, since there should be less than 2000 source rows. There appear to be several decent options in the commercial space (ExpressPivotCube, FastCube, HierCube), but they are all a few hundred dollars. This project already uses existing installations of Excel 2007 and SQL Server 2005/2008, so I might consider leveraging those, though I'd prefer a native Delphi component, if possible. There are also the very old Decision Cube components included in Delphi's Source\xtab directory, but they apparently no longer support unicode compilers (Delphi 2009+), since I got dozens of unicode-related compilation errors while test compiling that source in Delphi XE. Those components also still link to the long-deprecated BDE! Has anyone modified Decision Cube to support unicode/pure-TDataSet? The online tutorials I found were incomplete and silent on the dozens of BDE/unicode compilation errors I see, so I might have to tackle that on my own. Does anyone have suggestions where to start for a free/cheap basic crosstab/pivot grid component?

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  • What is the best memory supported by Asus Rampage Formula (1) motherboard

    - by James
    I'm rebuilding a PC from old components I have and I want to know what are the best ram sticks for the Asus Rampage Formula (The first motherboard in the Rampage Formula range) According to the Asus website (HERE) the maximum supported memory is 8GB but when I search through the memory compatibility list there's nothing above 2046mb and the motherboard only supports single or dual-channel memory. Can anyone point me in the direction of a more comprehensive list of compatible memory? Or does anyone know where I can ask about memory compatibility? Note: As far as I know, this model motherboard is no longer in production.

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  • A process serving application pool 'X' reported a failure. The process id was 'Y'. The data field c

    - by born to hula
    I have a WCF Web Service which is kept under an Application Pool on IIS. Lately I've been getting "Service Unavaiable" when I'm trying to make calls to this Web Service. The first thing I tried to do was restarting the Application Pool. I did it and after a couple of seconds, it crashed and stopped. Looking at the Event Viewer, I found these messages, which by the moment couldn't help me to find where the problem is. A process serving application pool 'X' reported a failure. The process id was '11616'. The data field contains the error number. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. After getting a couple of these, I got this one: Application pool 'X' is being automatically disabled due to a series of failures in the process(es) serving that application pool. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. I've already checked permissions and Application Pool configurations but everything seems to be OK. Have anyone been through this? Thanks in advance.

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  • Windows Server 2008 R2 Apache 2.2 PHP 5.3.3 install problem

    - by Tupak Goliam
    I am trying to install Apache 2.2 and PHP 5.3.3 on a Windows Server 2008 R2 box. I've managed to setup Apache, but PHP is not working correctly: I've downloaded the latest zip from windows.php.net (VC6) and I've modified http.conf in order to load the php5 module (LoadModule, AddType & PHPIniDir). So far, so good - phpinfo() is showing and I am happy... But, there is no php.ini file - I haven't yet renamed the bundled php.ini-development|php.ini-production file. If I do so (in order to modify PHP's configuration), no php code is interpreted (including phpinfo()). I've gone over the entire php.ini-development file and still it is not working... This is very strange. Any help is welcome, Thanks in advance.

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  • I need to duplicate software packages installed on one HPUX system to a test system

    - by oneodd1
    I am very inexperienced with HPUX and need to duplicate a production server for a test environment. I have 11.11 on the prod server and have completed the base install on the test server. What I need is a way to add the installed packages from the prod server to the test server. Unfortunately I haven't the foggiest idea how to do this. I've thought of using ignite backup and restore but don't have matching tape types between the two. The other thought was using swlist to gather the installed packages and then going to the website to download and install on the test environment. Has anyone successfully done something like this? Pointers?

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  • How can I display and log PHP errors on IIS7?

    - by Ben
    We're running PHP 5.2.5 on an IIS 7 Server and we're having problems making PHP errors visible... At the moment whenever we have a PHP error the server sends back a 500 error with the message "The page cannot be displayed because an internal server error has occurred." This might be a good setting for production websites but it's rather annoying on a development server... ;-) I have tried configuring php.ini to display errors to the screen as well as log them to a specific folder but it seems that the Server catches all errors before and prevents and handling by PHP... Does someone know what we have to do to make IIS display PHP errors on screen? Any links, tipps or tutorials on the subject would be appreciated!

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  • Apache not running from rc.d on FreeBSD

    - by Oksana Molotova
    I'm using FreeBSD 8.3 and Apache 2.2. I didn't install Apache from ports, instead compiled it from source because I wanted to move the binary and configuration to a different path (I'm centering all of the major production daemons and their configurations in a single place). In any case, I based the /usr/local/etc/rc.d/apache22 file on one from a different server where it was installed from ports, I only modified the binary and config paths within. I can manually execute it with /usr/local/etc/rc.d/apache22 start, however even with apache22_enable="YES" in /etc/rc.conf it fails to start. All permissions and ownership are identical to the other server where it works. What am I missing and is there a way to debug this kind of thing?

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  • Run a MongoDB configuration server without 3GB of journal files

    - by Thilo
    For a production sharded MongoDB installation we need 3 configuration servers. According to the documentation "the config server mongod process is fairly lightweight and can be ran on machines performing other work". However, in the default configuration, they all have journalling enabled, and with preallocation this takes up 3 GB of disk space. I assume that the actual data and transaction volume of a config server is quite small, so that this seems a bit too much. Is there a way to (safely!) run these config servers with much less disk use for the journal? Do I need journalling at all on config servers? Can I set the journal size to be smaller?

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  • Windows Load-Balancing, Forward-Proxying Software

    - by LandonC
    Does anyone know of any Windows software that will do forward-proxying load-balancing, like HAProxy does? There are tons of reverse-proxy solutions, but I can't find any that do what HAProxy does, that is, allows you to load-balance a group of forwarding-proxies. I have a proxy farm (don't ask) that I need to round-robin balance. HAProxy will do it, but is very unstable on Windows. Thoughts? I'd really appreciate it. And yes, this is an actual, production environment question.

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  • Access to NTP via IP which doesn't change often

    - by faulty
    I'm trying to sync the clock of our production server located in a data center with pool.ntp.org. For security reason, our servers has no internet access unless we requested to open specific ip/port explicitly. I worked out a list of IPs based on 0.asia.ntp.org 1.asia.ntp.org 2.asia.ntp.org 3.asia.ntp.org Not realizing ntp.org is using round robin DNS and the servers being voluntary, they changes from time to time. In fact the IP I've got from 3.asia.ntp.org last month is no longer working now. I'm wondering if there's a publicly known NTP server that doesn't change as often or if there's a way to go around this without having to request an update to the firewall on a monthly basis. I believe many admin is facing the same issue here.

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