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Articles indexed Wednesday December 22 2010

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• Resources for finding Haskell jobs?

  - by Dan

  Where is a good place to go to find a job where I can (frequently) use Haskell? Just to be clear, I am not asking: What's the Haskell market like? Why is Haskell used so little in the industry? What is Haskell actually useful for? Nor am I asking you to tell me that Haskell jobs can't be found. That is the default conclusion if no good responses show up here. I am asking, for the 2 or 3 Haskell jobs that are out there, how can I find them?

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• Running Android projects in Eclipse has error: An internal error occurred during: "Launching InsideCarolina2". com/android/ddmlib/InstallException

  - by allen

  My eclipse flipped out, and now will not run any of my Android projects, all of which were working fine before. If I try to right click and run as Android project, nothing happens. If I go to properties of the project and go to run/debug settings and try to create a new one, I get an error dialog that says 'Update LCD' has encountered a problem. An internal error has occured. The details show: "An internal error occurred during: "Launching InsideCarolina2". com/android/ddmlib/InstallException"

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• Do servlet containers prevent web applications from causing each other interference and how do they do it?

  - by chrisbunney

  I know that a servlet container, such as Apache Tomcat, runs in a single instance of the JVM, which means all of its servlets will run in the same process. I also know that the architecture of the servlet container means each web application exists in its own context, which suggests it is isolated from other web applications. As depicted here: Accepting that each web application is isolated, I would expect that you could create 2 copies of an identical web application, change the names and context paths of each (as well as any other relevant configuration), and run them in parallel without one affecting the other. The answers to this question appear to support this view. However, a colleague disagrees based on their experience of attempting just that. They took a web application and tried to run 2 separate instances (with different names etc) in the same servlet container and experienced issues with the 2 instances conflicting (I'm unable to elaborate more as I wasn't involved in that work). Based on this, they argue that since the web applications run in the same process space, they can't be isolated and things such as class attributes would end up being inadvertently shared. This answer appears to suggest the same thing The two views don't seem to be compatible, so I ask you: Do servlet containers prevent web applications deployed to the same container from conflicting with each other? If yes, How do they do this? If no, Why does interference occur? and finally, Under what circumstances could separate web applications conflict and cause each other interference?, perhaps scenarios involving resources on the file system, native code, or database connections?

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• Debugging SIGABRT within NSManagedObjectContext -save:

  - by westsider

  From inside NSManagedObjectContext -save: I am getting this message: Assertion failed: (_Unwind_SjLj_Resume() can't return), function _Unwind_SjLj_Resume, file /SourceCache/libunwind/libunwind-24.1/src/Unwind-sjlj.c, line 326. Program received signal: “SIGABRT”. warning: Unable to read symbols for /Developer/Platforms/iPhoneOS.platform/DeviceSupport/4.2.1 (8C148)/Symbols/Developer/usr/lib/libXcodeDebuggerSupport.dylib (file not found). This happens when I delete an Experiment object with to-many with Run which has to-many with Sample which has to-one with Data. Experiment also has to-many with Page which has to-many with Display which has to-many to Run. I mention this to point out the cyclical nature of the graph. Here is a simplified graph of model: I had been using Delete Rules but have now switched to "No Action" delete rules in combination with -prepareForDeletion methods for all of these classes. This change made no difference. In both cases, the error message is the same. Interestingly, when I relaunch the app, all the objects that were marked for deletion have been deleted. Also, if an Experiment has no Run objects, then deletion works without incidence. For that matter, deleting a single Run from an Experiment also works. I am hoping that someone has seen something like this and can offer advice on what would cause this. Or, if someone has advice on how to get libXcodeDebuggerSupport.dylib for iOS 4.2.1, that might also be helpful. Update: I followed advice found here and was able to get Xcode to find libXcodeDebuggerSupport.dylib for iOS 4.2.1. But this did not help at all in diagnosing problem - which persists.

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• Software to measure power draw of HP Server

  - by tombull89

  I'm after some software to measure the power draw of a HP Server, namely a DL360 series. I know Nagios is used for logging and monitering but I'm not sure if it logs power usage as well. I've also tried to find the HP Server Management package but am not sure if this shows power usage either. I'm thinking my best bet would to buy some sort of device that goes inbetween the wall and the servers plug. Can anybody suggest what would do for me?

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• Roundcube can't connect to PostgreSQL database

  - by kenny.r

  I'm trying to install Roundcube on a CentOS 5.5 server, with a PostgreSQL 8.1.22 database. The first page of the installer script, that checks for the presence of php libraries and such, gives me green OKs across the board. I even went out of my way to install the optional ones. Page two generates me two configuration files (main.inc.php and db.inc.php) which I put into place. Page three is where things go wrong: Check DB config DSN (write): NOT OK(MDB2 Error: connect failed) Make sure that the configured database exists and that the user has write privileges DSN: pgsql://roundcube:password@localhost/roundcubemail The info you see there (user roundcube, password password, server localhost and database roundcubemail) is all correct. The database roundcubemail belongs to the user roundcube and it has write permissions. I have no clue why it can't connect to that database. I'm managing it with phpPgAdmin, which is running on the very same Apache, on the same server!

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• SQL cluster instance names for large project

  - by Sam

  We're setting up two clusters. One dev and one prod. The Production will host two SQL instances - a OLTP and a DW. The development will host 4 OLTP non-production environments and at least one DW non-production. We're working on getting more DW non-prods and possibly more OLTP systems. I'm considering a naming scheme like this, where PROJ would be 3 initials for the project name. Dev Cluster MSSQLPROJD1\D1 (DEV) MSSQLPROJD2\D2 (TEST) MSSQLPROJD3\D3 (QA) MSSQLPROJD4\D4 (STAGE) MSSQLPROJD5\D5 (DW) Prd Cluster MSSQLPROJP1\P1 (PRD) MSSQLPROJP2\P2 (DW) To the left of the slash, each name must be unique network wide. On each server, the instance name, to the right of the slash, must be unique. Any thoughts on this? I'm trying to avoid having instance names drifting from reality as the project progresses - say we change what we call a certain environment or want to repurpose one. Then we can update a listing of the purposes for the instances and be done with it. How has a scheme like this worked out for you? Maybe you do things another way in your shop - tell me about it. Thanks.

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• httpd (no pid file) not running while restarting apache

  - by user59503

  Hi I am working on ubuntu. I got the error messages while try to restart apache. root@XXX:/etc/init.d# sudo /etc/init.d/apache2 restart * Restarting web server apache2 apache2: Could not reliably determine the server's fully qualified domain name, using xxx.xxx.xx.xxx for ServerName httpd (no pid file) not running apache2: Could not reliably determine the server's fully qualified domain name, using xxx.xxx.xx.xxx for ServerName (98)Address already in use: make_sock: could not bind to address 0.0.0.0:80 no listening sockets available, shutting down Unable to open logs I got the following message when tried netstat -pant tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 0 32748 9950/httpd tcp 429 0 xxx.xxx.xx.xxx:80 xxx.xxx.xx.xxx:xxxxx CLOSE_WAIT 0 0

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• Active Directory problems while trying to perfom compare operation

  - by Alex

  I have CentOs 5.5 with Apache 2.2 and SVN installed. Also I have Windows 2003 R2 with Active Directory. I'm trying to authorize users via AD so each user have access to repo if he is a member of corespondent group in AD. Here is my apache config: LoadModule dav_svn_module modules/mod_dav_svn.so LoadModule authz_svn_module modules/mod_authz_svn.so LDAPVerifyServerCert off ServerName svn.mydomain.com DocumentRoot /var/www/svn.mydomain.com/htdocs RewriteEngine On [Location /] AuthType basic AuthBasicProvider ldap AuthzLDAPAuthoritative on AuthLDAPURL ldaps://comp1.mydomain.com:636/DC=mydomain,DC=com?sAMAccountName?sub?(objectClass=*) AuthLDAPBindDN [email protected] AuthLDAPBindPassword binduserpassword [/Location] [Location /repos/test] DAV svn SVNPath /var/svn/repos/test AuthName "SVN repository for test" Require ldap-group CN=test,CN=ProjectGroups,DC=mydomain,DC=com [/Location] When I'm using "Require valid-user" everything goes fine, "Require ldap-user" also works. But as soon as I use "Require ldap-group" authorization fails. Trere are no errors in apache logs, but Active Directory shows folowing error: Event Type: Information Event Source: NTDS LDAP Event Category: LDAP Interface Event ID: 1138 Date: 10/9/2010 Time: 1:28:52 PM User: MYDOMAIN\binduser Computer: COMP1 Description: Internal event: Function ldap_compare entered. Event Type: Error Event Source: NTDS General Event Category: Internal Processing Event ID: 1481 Date: 10/9/2010 Time: 1:28:52 PM User: MYDOMAIN\binduser Computer: COMP1 Description: Internal error: The operation on the object failed. Additional Data Error value: 2 0000208D: NameErr: DSID-031001CD, problem 2001 (NO_OBJECT), data 0, best match of: 'DC=mydomain,DC=com' I'm confused by this problem. What I'm doing wrong?

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• Rebroadcasting videostream from IP-camera

  - by Alexander

  The problem is the following: I have a camera D-Link securicam dcs-2121 (http://www.dlink.com.sg/products/?idproduct=310) it has its own web-server and works perfectly with a few connected users, but what I want is to make a lot amount of users able to connect and watch videostream, built-in server can't get trough many connections. So I need to translate stream to any external server and broadcast from it. What software or maybe service I need to use to this effect? thanks.

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• Apache showing 500 error during Active Directory LDAP authentication

  - by Tyllyn

  I have Apache (on Windows Server) set up to authenticate one directory through Active Directory. Config settings are as follows: <LocationMatch "/trac/[^/]+/login"> Order deny,allow Allow from all AuthBasicProvider ldap AuthzLDAPAuthoritative Off AuthLDAPURL ldap://<ip-redacted>:3268/cn=Users,OU=MyBusiness,DC=<dc-redacted>,DC=local?sAMAccountName?sub?(objectClass=*) AuthLDAPBindDN trac@<dc-redacted>.local AuthLDAPBindPassword "<password-redacted>" AuthType Basic AuthName "Protected" require valid-user </LocationMatch> Watching, Wireshark, I see the following get sent through when I visit the page: To the AD server: bindRequest(1) "trac@<dc-redacted>.local" simple And from the AD server: bindResponse(1) success I'm assuming this means that the auth was successful... but Apache doesn't think so. It returns a 500 server to me. Apache logs show the following: [Thu Nov 18 16:21:12 2010] [debug] mod_authnz_ldap.c(379): [client 192.168.x.x] [7352] auth_ldap authenticate: using URL ldap://<ip-redacted>:3268/cn=Users,OU=MyBusiness,DC=<dc-redacted>,DC=local?sAMAccountName?sub?(objectClass=*), referer: http://192.168.x.x/trac/Trac/login [Thu Nov 18 16:21:12 2010] [info] [client 192.168.x.x] [7352] auth_ldap authenticate: user authentication failed; URI /trac/Trac/login [ldap_search_ext_s() for user failed][Filter Error], referer: http://192.168.x.x/trac/Trac/login Now, that log file shows a failed auth for a blank user. I am confused. Any idea what I am doing wrong... and how I can get the Apache authentication working? :) Thanks!

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• What causes PHP pages to consistently download instead of running normally

  - by Jonathan

  Hi, I'm running a Ubuntu Server on a VM, to test out different web forum solutions. I have set up a ~/public_html/ to be accessible with the apache2 web server, and that works fine. However when I go to a .php file on a browser (using my VM's ip-address/~username/phpfile.php) it does not display it as it should. Instead it offers to save to file/asks what program to open it with. Interestingly though that dialog box does recognise that it is a php file. I have the following version of php installed on the system: PHP 5.3.2-1ubuntu4.5 with Suhosin-Patch (cli) (built: Sep 17 2010 13:49:46) Copyright (c) 1997-2009 The PHP Group Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies And the following server: Server version: Apache/2.2.14 (Ubuntu) Server built: Nov 18 2010 21:19:09 If anyone knows what might be causing this/potential solutions it would make me very happy :) EDIT: Turns out files this behaviour was only apparent on files in the ~/public_html/ directory. All php files in /var/www/ work fine. Prizes go to whoever can explain why? :D (And by prizes I just mean a well done, no actual prizes I'm afraid.)

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• configuring linux server firewall to allow acces on a certain range of IP addresses

  - by eggman20

  Hi Guys, I'm not sure if this is the right place to ask this but I'm currently trying to get an Ubuntu 10.10 server up and running for the first time and I'm using Webmin for administration. I'm stuck on the setting up the firewall. What I need to do is to ONLY allow a range of IPs (e.g 128.171.21.1 - 128.171.21.100) to access the HTTP server and Webmin. I've seen a lot of tutorials but none of them fits what I needed. Thanks in advance!

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• My system is always disk-bound (the disk light is always on). Why is this?

  - by Scoobie

  I have been given a laptop by the good folks at my company on which to do my work (Java development). I usually use eclipse as my primary development platform. The laptop is a Dell D830 and runs Windows 7 - 32 bit. Although the processor supports a 64 bit instruction-set, licensing limits me to running the 32 bit OS. The HDD is a WD1600BEVT (Western Digital). I have noticed that my disk is always very slow. Windows start up is usually pretty quick, however as soon as I log on, my disk light stays on and usually, the laptop takes about 4 minutes (after logging in -- immediately upon getting the prompt to press Ctrl + Alt + Del to log in) before it's usable. Questions: Is this expected behavior? What can I do to examine the disk and determine the cause of the problem? What can I do to improve my disk's performance? Any optimizations you may be able to suggest? Other Questions: Some have suggested running Process Monitor (from sysinternals), but how would i get the log since start up? Instead of trying to fix this myself, should I simply push this onto the system administrator? Thanks all.

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• After returning from standby mode, win7 asks for login twice

  - by Force Flow

  When a Windows 7 32-bit PC attached to a domain comes back from standby mode and has no user logged in, if I log in once, it jumps back to the login screen. If I log in for a second time, then it actually logs in. This happens on multiple PCs, and is not a hardware issue. The PCs are also free of viruses/malware, and are otherwise problem-free. Why does it do this, and is there a way to prevent this annoyance?

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• How can I change the default program installation directory in Windows 7?

  - by Max

  Windows 7 is installed on my C drive, which is quite small. I am very tired of instructing new programs to put their files on my larger D drive during installation; I would like to change the default drive. This article says that you can use a registry hack, but I am giving Microsoft the benefit of the doubt and naively assuming that a configuration option exists somewhere. It's 2010... do I really have to hack my registry to make a simple tweak like this? Also, there's a ServerFault question that explains how to move the "Users" directory and create a symlink, which could also work. However, at the moment I have some apps in C:\Program Files, some apps in C:\Program Files (x86), and some apps in the corresponding folders on D:\, so it would be a hassle. Also, my small OS boot drive is a 10k RPM WD Raptor, and I feel like that probably gives a speed boost to apps installed on it that need to read & write to their directories a bunch. I wonder if it actually matters.

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• HDD from Mid-2009 MacBook Pro works OUTSIDE laptop, but not INSIDE.

  - by Jaime

  Leading up to the problem: I was working late one night on a Keynote presentation. My battery ran out, and the computer did that hibernation thing it does when there's no battery power. I got my charger, connected it to my computer, and then pushed the power button. It started up for a second in to the gray screen it usually goes to. Then I turned around, tugging the magsafe charger out of the connector on the computer. This caused my computer to shut down again. Now I can't get it to boot at all -- just a blinking folder icon with a question mark in it on boot up. I've tried pretty much everything to deal with this. Multiple forced reboots, resetting PRAM and NVRAM, etc. I booted to original OSX disc and ran disc utility, but I discovered that there is no disc to boot to. I ran the Apple Hardware Test, and it came back 100% good. I booted to an Ubuntu live-boot disc and ran that disc utility, just to see if it recognized a disc at all. It didn't. So I removed the HDD, and replaced it with a bootable volume running BSD. It didn't recognize that HDD either. I then attached my HDD to my computer via an external enclosure with a USB interface. Lo and behold, it booted! So my computer now only work with my HDD attached externally. This means that the HDD is functional. And the AHT returns no hardware malfunctions. So what the hell is going on? … In the meantime: I've put the HDD back into the computer but it still doesn't do anything at all (I'm running it externally right now). I just checked the serial number and my 1 year warranty expired recently, so I can't send it back for repair. … Little Help Thoughts? I've been searching everywhere for leads, but no luck. …

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• How to find full/real email address from Lotus Notes?

  - by DA

  Is there any way to get the full set of email addresses? Example: I receive an email sent to a Lotus group 'all department employees'. I'd like to be able to grab the actual email addresses contained within (not their Lotus user name) so that I could email everyone from a client other than Lotus. Does such an option exist? I believe this was doable in Exchange with a right-click and 'expand nickname' type of action. I'm on a Mac.

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• How do I reformat/reinstall an OS on a hard drive after its been wiped by eban?

  - by Aggrevated

  I am trying to install XP SP2 Home on a Dell Inspiron 531s. Yes it came with Vista but I happen to own a legal copy of XP. I bought the hard drive off eBay(used). I changed the bios settings to boot from CD and when I start up the computer it goes to the hard drive which says its been cleaned using eban XX.XXX.XXX. My problem is that I can't get the PC to boot from the XP disk. I have tried putting the disk into another PC it works. I have put the bad hard drive back in and the dvd+rw works. I am really stumped and am beginning to think that the hard drive is unusable. I only have the sata cords for 1 hard drive to be hooked up at a time. Any ideas or suggestions or confirmation that I can't use this hard drive would be appreciated. Yes I am probably a 'noob' but I have installed XP and Vista many times without any problems. I don't need to be put down on my level of experience I just need answers. Thanks Everyone

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• lenovo thinkpad sl500 fn keys & hdd protection on ubuntu

  - by Infestor

  (i use ubuntu 10.04 64bit) i cant get most of my fn keys to work in this laptop. i especially need fn+f8, which switches between trackpoint & touchpad. what i tried: sudo nano /etc/modules (added lenovo-sl-laptop to the file) then: sudo modprobe lenovo-sl-laptop this failed: FATAL: Module lenovo_sl_laptop not found. as for the hdapsd i dont have it installed, since i dont know how to configure it (i guess it helps hdd protection).

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• Using the af:poll to refresh parts of the page periodically

  - by shay.shmeltzer

  Just a quick sample of using the af:poll components. A component that enables you to do things in a periodic fashion. For example check if something has changed on the server and update the UI. A more "modern" approach is to actually use push instead of pull, and ADF Faces will allow you to do that with ADS (here, and here). But the poll still has its place. It's quite useful for dashboard type of applications where you want periodic updates of the graphs shown on the page. As you can see it's quite simple to use the tag. I also show my lazy approach to invoking declarative operations on a data control from a backing bean without manually writing code.

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• Fun with SQL Server Profiler trace files and PowerShell

  Running Profiler traces against multiple servers becomes a painful process when it’s time to collate and filter all that data. It would be time-consuming, frustrating and messy if Laerte hadn’t written this handy PowerShell script (complete with examples) to help you out. Free trial of SQL Backup™“SQL Backup was able to cut down my backup time significantly AND achieved a 90% compression at the same time!” Joe Cheng. Download a free trial now.

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• how to make a tableview to be grouped style without indenting cells

  - by Ying

  Hi, I want a tableview without floating headers and footers, but in the UITableViewStylePlain style. When I used a grouped style tableview, it draws this rounded rectangle around my cells, and it is annoying!! Is there a setting to turn this off? I have tried tableView.backgroundView = nil; tableView.separatorStyle = UITableViewCellSeparatorStyleNone; tableView.autoresizingMask = UIViewAutoresizingNone; All don't work. Does anyone have any idea how to do this? Thanks

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• Making one value "special"

  - by SplashHit

  What is the "computer science" term for the practice of assigning a special meaning to one of a type's values. For example a numeric variable called "amount_to_transfer" where the special value "0" means "entire account balance" or a date value "spouse_date_of_birth" where "1/1/1800" means "unmarried". I happen to feel that this is quite a bad "smell", but I'd like to have a name for it, and if possible, some blog post or article about why it's bad and how to fix it.

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• Improve a regex statement in order to be as efficient as it can be

  - by user551625

  I have a PHP program that, at some point, needs to analyze a big amount of HTML+javascript text to parse info. All I want to parse needs to be in two parts. Seperate all "HTML goups" to parse Parse each HTML group to get the needed information. In the 1st parse it needs to find: <div id="myHome" And start capturing after that tag. Then stop capturing before <span id="nReaders" And capture the number that comes after this tag and stop. In the 2nd parse use the capture nº 1 (0 has the whole thing and 2 has the number) from the parse made before and then find . I already have code to do that and it works. Is there a way to improve this, make it easier for the machine to parse? preg_match_all('%<div id="myHome"[^>]>(.*?)<span id="nReaders[^>]>([0-9]+)<"%msi', $data, $results, PREG_SET_ORDER); foreach($results AS $result){ preg_match_all('%<div class="myplacement".*?[.]php[?]((?:next|before))=([0-9]+).*?<tbody.*?<td[^>]>.*?[0-9]+"%msi', $result[1], $mydata, PREG_SET_ORDER); //takes care of the data and finish the program Note: I need this for a freeware program so it must be as general as possible and, if possible, not use php extensions ADD: I ommitted some parts here because I didn't expect for answers like those. There is also a need to parse text inside one of the tags that is in the document. It may be the 6th 7th or 8th tag but I know it is after a certain tag. The parser I've checked (thx profitphp) does work to find the script tag. What now? There are more than 1 tag with the same class. I want them all. But I want only with also one of a list of classes..... Where can I find instructions and demos and limitations of DOM parsers (like the one in http://simplehtmldom.sourceforge.net/)? I need something that will work on, at least, a big amount of free servers.

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