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• ca-certificates-java fails to install

  - by Jonas

  I use a VPS with Ubuntu Server 10.10. I want to use Jetty and run the command sudo apt-get install jetty but it fails because the installation encounted errors while processing ca-certificates-java. I have tried to install the failed package with: sudo apt-get install ca-certificates-java How can I solve this? I have run sudo apt-get update and sudo apt-get upgrade but I get the same errors after that. I have also installed Ubuntu Server x64 on a VirtualBox, but the two Ubuntu Server 10.10 has different kernel versions (2.6.35 on VirtualBox and 2.6.18 on my VPS). And on VirtualBox I can install Jetty without any problems.

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• How do software updates work?

  - by Jonas

  I would like to know how software updates work for my Ubuntu Server 10.10. I have been recommended to use apt-get install for installing new software and apt-get update for updating software for a Ubuntu Server in production use. Because these packages are tested for Ubuntu in contrast to download source code and compile the software on the box. But on my Ubuntu Server 10.10, I don't get the latest stable version of PostgreSQL (9) or the latest stable version of Nginx (8) using apt-get install. So how is this working, will these software be updated when I later run apt-get update or do I have to later run apt-get install again, or do I have to wait for the next release of Ubuntu to get them? And are patches and security updates managed in the same way? Or can they be updated automatically? If there is such a setting, how do I check what my system is using?

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• How do software updates work on Ubuntu?

  - by Jonas

  I would like to know how software updates work for my Ubuntu Server 10.10. I have been recommended to use apt-get install for installing new software and apt-get update for updating software for a Ubuntu Server in production use. Because these packages are tested for Ubuntu in contrast to download source code and compile the software on the box. But on my Ubuntu Server 10.10, I don't get the latest stable version of PostgreSQL (9) or the latest stable version of Nginx (8) using apt-get install. So how is this working, will these software be updated when I later run apt-get update or do I have to later run apt-get install again, or do I have to wait for the next release of Ubuntu to get them? And are patches and security updates managed in the same way? Or can they be updated automatically? If there is such a setting, how do I check what my system is using?

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• How can I install other applications after a failed installation using apt-get?

  - by Jonas

  I have a VPS with Ubuntu Server 10.10 x64. I tried to install Java using apt-get install openjdk-6-jre but that fails, see ca-certificates-java fails to install. Now I would like to install PHP with sudo apt-get install nginx php5-fpm php-apc php5-pgsql php5-suhosin but that also fails, with the same error message as I had with Java. Why is that? How can I install other applications now after the installation of Java has failed?

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• Windows 8&ndash;Custom WinRT components and WinJS

  - by Jonas Bush

  Wow, I’m still alive! I installed the RTM of Windows 8 when it became available, and in the last few days have started taking a look at writing a windows 8 app using HTML/JS, which in and of itself is a weird thing. I don’t think that windows developers of 10 years ago would’ve thought something like this would have ever come about. As I was working on this, I ran across a problem, found the solution, and thought I’d blog about it to try and kick start me back into blogging. I already answered my own question on Stack Overflow, but will explain here. I needed to create a custom WinRT component to do some stuff that I either wouldn’t be able to or didn’t know how to do with the javascript libraries available to me. I had a javascript class defined like this: WinJS.Namespace.define("MyApp", { MyClass: WinJS.Class.define(function() { //constructor function }, { /*instance members*/ }, { /*static members*/ }) }); This gives me an object I can access in javascript: var foo = new MyApp.MyClass(); I created my WinRT component like this: namespace MyApp { public sealed class SomeClass { public int SomeMethod() { return 42; } } }   With the thought that from my javascript, I’d be able to do this: var foo = new MyApp.MyClass(); var bar = new MyApp.SomeClass(); //from WinRT component foo.SomeProperty = bar.SomeMethod();   When I tried this, I got the following error when trying to construct MyApp.MyClass (the object defined in Javascript) 0x800a01bd - Javascript runtime error: Object doesn't support this action. I puzzled for a bit, then noticed while debugging that my “MyApp” namespace didn’t have anything in it other than the WinRT component. I changed my WinRT component to this: namespace MyAppUtils { public sealed class SomeClass { //etc } } And after this, everything was fine. So, lesson learned: If you’re using Javascript and create a custom WinRT component, make sure that the WinRT component is in a namespace all its own. Not sure why this happens, and if I find out why or if MS says something about this somewhere, I’ll come back and update this.

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• Using multiple A-records for my domain - do web browsers ever try more than one?

  - by Jonas

  If I add multiple A-records for my domain, they are returned in a round robin order by DNS-servers. E.g: 1.1.1.1 A example.com 1.1.1.2 A example.com 1.1.1.3 A example.com But how does webbrowsers react if the first host (1.1.1.1) is down (unreachable)? do they try the second host (1.1.1.2) or do they return a error message to the user? Are there any difference between the most popular browsers? If I implement my own application, I can implement so that the second is used in case the first is down, so it's possible. And this would be very helpful to create a fault tolerant website.

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• When and why you should use void (instead of i.e. bool/int)

  - by Jonas

  I occasionally run into methods where a developer chose to return something which isn't critical to the function. I mean, when looking at the code, it apparently works just as nice as a void and after a moment of thought, I ask "Why?" Does this sound familiar? Sometimes I would agree that most often it is better to return something like a bool or int, rather then just do a void. I'm not sure though, in the big picture, about the pros and cons. Depending on situation, returning an int can make the caller aware of the amount of rows or objects affected by the method (e.g., 5 records saved to MSSQL). If a method like "InsertSomething" returns a boolean, I can have the method designed to return true if success, else false. The caller can choose to act or not on that information. On the other hand, May it lead to a less clear purpose of a method call? Bad coding often forces me to double-check the method content. If it returns something, it tells you that the method is of a type you have to do something with the returned result. Another issue would be, if the method implementation is unknown to you, what did the developer decide to return that isn't function critical? Of course you can comment it. The return value has to be processed, when the processing could be ended at the closing bracket of method. What happens under the hood? Did the called method get false because of a thrown error? Or did it return false due to the evaluated result? What are your experiences with this? How would you act on this?

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• How to make Jetty webserver listen on port 80?

  - by Jonas

  I would like to use Jetty as a webserver. I have edited the configuration file at /etc/default/jetty and set: # change to 0 to allow Jetty start NO_START=0 # Listen to connections from this network host # Use 0.0.0.0 as host to accept all connections. JETTY_HOST=0.0.0.0 Now I can reach the Jetty webserver at http://192.168.1.10:8080 but I would like to have Jetty listening on port 80. I have tried this setting in the same configuration file: # The network port used by Jetty JETTY_PORT=80 and then restart Jetty with sudo service jetty restart but it doesn't work. How can I change so that the Jetty webserver is listening on port 80?

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• What programming language and framework has best support for agile web development?

  - by Jonas

  If I would like to quickly set up a modern website, what programming language + framework has best support for this? E.g. short and easy to understand code for a beginner and a framework with support for modern features. Disregard my current knowledge, I'm more interested in the capacity of web programming languages and frameworks. Some requirements: RESTful URIs: http://example.com/category/id/page-title similar to the urls here on Programmers. ORM. A framework that has good database support and provide ORM or maybe a NoSQL-database. Good support for RESTful WebServices. Good support for testing and unit testing, to make sure the site is working as planned. Preferably a site that is ready to scale with an increasing number of users.

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• Open source framework quality [closed]

  - by Jonas Byström

  It's not hard to find snippets, components or tools/toolkits in the open source world which holds the quality bar really high. Myself I use git, python, linux, gcc, bash and a whole range of others on a daily basis, and I love them. But when it comes to bigger frameworks, which are intended for facilitating larger tasks of an application without much interference, I'm not as enthusiastic. I've tried a few commercial frameworks (game engines), which were okay, but all big open source frameworks which I've used myself, or which I have seen used in applications were decidedly worse than the commercial equivalent. But I'm not sure if my experience was typical. Where have bigger open source frameworks for facilitating larger tasks of an application been able to equal or exceed commercial frameworks, and how were they better?

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• Web framework able to handle many concurrent users [closed]

  - by Jonas

  Social networking sites needs to handle many concurrent users e.g. for chat functionality. What web frameworks scales well and are able to handle more than 10.000 concurrent users connected with Comet or WebSockets. The server is a Linux VPS with limited memory, e.g. 1GB-8GB. I have been looking for some Java frameworks but they consume much memory per connection. So I'm looking for other alternatives too. Are there any good frameworks that are able to handle more than 10.000 concurrent users with limited memory resources?

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• Using multiple A-records for my domain - do web browsers ever try more than one?

  - by Jonas

  If I add multiple A-records for my domain, they are returned in a round robin order by DNS-servers. E.g: 1.1.1.1 A example.com 1.1.1.2 A example.com 1.1.1.3 A example.com But how does webbrowsers react if the first host (1.1.1.1) is down (unreachable)? do they try the second host (1.1.1.2) or do they return a error message to the user? Are there any difference between the most popular browsers? If I implement my own application, I can implement so that the second is used in case the first is down, so it's possible. And this would be very helpful to create a fault tolerant website.

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• Is It bad for SEO to have internal redirected links? [closed]

  - by Jonas Lindqvist

  I have a large number of pages having similar but not identical content. Example: site.com/dream_dictionary_flying and site.com/dream_interpretation_flying. The problem is that although not being identical, they are sometimes on the edge of being duplicate content. The solution via redirect 301 in htaccess is simple and can be done in a minute, BUT, changing all existing links on the whole site from "/something" to "/something_else" would take ages, it would be thousands of manual changes taking x hundreds of hours. My question is this; is it bad for SEO to have internal links that are redirected, or rather HOW bad is it? For the human user it would not matter at all but from what I have experienced, the search engines don't like it. Is there any rule of thumb here? Please come back with your thoughts and experience on this. Thanks!

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• How does one handle sensitive data when using Github and Heroku?

  - by Jonas

  I am not yet accustomed with the way Git works (And wonder if someone besides Linus is ;)). If you use Heroku to host you application, you need to have your code checked in a Git repo. If you work on an open-source project, you are more likely going to share this repo on Github or other Git hosts. Some things should not be checked in the public repo; database passwords, API keys, certificates, etc... But these things still need to be part of the Git repo since you use it to push your code to Heroku. How to work with this use case? Note: I know that Heroku or PHPFog can use server variables to circumvent this problem. My question is more about how to "hide" parts of the code.

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• Silverlight Cream for November 21, 2011 -- #1171

  - by Dave Campbell

  In this Issue: Colin Eberhardt, Sumit Dutta, Morten Nielsen, Jesse Liberty, Jeff Blankenburg(-2-), Brian Noyes, and Tony Champion. Above the Fold: Silverlight: "PV Basics : Client-side Collections" Tony Champion WP7: "Pushpin Clustering with the Windows Phone 7 Bing Map control" Colin Eberhardt Shoutouts: Michael Palermo's latest Desert Mountain Developers is up Michael Washington's latest Visual Studio #LightSwitch Daily is up From SilverlightCream.com: Pushpin Clustering with the Windows Phone 7 Bing Map control Colin Eberhardt is back discussing Pushpins for a BingMaps app on WP7 and provides a utility class that clusters pushpins, allowing you to render 1000s of pins on an app ... all the explanation and all the code Part 22 - Windows Phone 7 - Tile Push Notification Part 22 in Sumit Dutta's WP7 series is about Tile Push Notification... nice tutorial with all the code listed Correctly displaying your current location Morten Nielsen demonstrates formatting the information from the GPS on your WP7 into something intelligible and useful Spiking the Pomodoro Timer Jesse Liberty put up a quick and dirty version of a Pomodoro timer for WP7.1 to explore the technical challenges of the Full Stack Phase 2 he's cranking up 31 Days of Mango | Day #11: Network Jeff Blankenburg's Number 10 in his 31 Days quest of WP7.1 is about the NetworkInformation namespace which gives you all sorts of info on the user's device network connection availability, type, etc. 31 Days of Mango | Day #11: Live Tiles Jeff Blankenburg takes off on Live Tiles for Day 11... big topic for a 1 day post, but he takes off on it... updating and Live Tiles too Working with Prism 4 Part 2: MVVM Basics and Commands Brian Noyes has part 2 of his Prism/MVVM series up at SilverlightShow... very nice tutorial on the basics of getting a view and viewmodel up, and setting up an ICommand to launch an Edit View... plus the code to peruse. PV Basics : Client-side Collections Tony Champion is startig a series on Silverlight 5 and Pivot Viewer... First up is some basics in dealing with the control in SL5 and talking about Client-side Collections... great informative tutorial and all the code Stay in the 'Light! Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCream Join me @ SilverlightCream | Phoenix Silverlight User Group Technorati Tags: Silverlight    Silverlight 3    Silverlight 4    Windows Phone MIX10

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• 5 New Java Champions

  - by Tori Wieldt

  The Java Champions have nominated and accepted five new members to their group: Jonas Bonér, James Strachan, Rickard Oberg, Régina ten Bruggencate, and Clara Ko. Congratulations, and we look forward to hearing more from each of them!Jonas Bonér (Sweden) is a Java entrepreneur, programmer, teacher, speaker and author. He is an active contributor to the Open Source community; and most notably created the Akka Project, AspectWerkz Aspect-Oriented Programming (AOP) framework. James Strachan (UK) has more than 20 years experience in enterprise software development with a background in finance and middleware and is also committer on a number of open source projects, including Apache Karaf, Maven, Lift and Jersey.Rickard Oberg (Malaysia) has worked on several Open Source projects that involve JEE development, such as JBoss, XDoclet and WebWork. He has also been the principal architect of the SiteVision CMS/portal platform, where he used AOP as the foundation. Now he works for Jayway, developing the Qi4j framework and Composite Oriented Programming paradigm.Régina ten Bruggencate (Netherlands) is a senior Java developer for iProfs with 10-plus years of Java experience, mainly on enterprise applications. Régina is the current president of Duchess, and as such has the responsibility for the site and community. Duchess is a global organization for women in Java technology, currently with 350 members in over 50 countries.Clara Ko (Netherlands) is a freelance Java/J2EE professional living in Amsterdam. She has worked as a developer, architect, and project manager. She promotes the use of open source software and has led initiatives to adopt agile practices across multiple organizations. Clara is also co-founder of Duchess.The Java Champions are an exclusive group of passionate Java technology and community leaders who are community-nominated and selected under a project sponsored by Oracle. Java Champions get the opportunity to provide feedback, ideas, and direction that will help Oracle grow the Java Platform. This interchange may be in the form of technical discussions and/or community-building activities with Oracle's Java Development and Developer Program teams. Full bios and details about the champions are on http://java-champions.java.net/.

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• android shut-down errors / thread problems

  - by iQue

  Im starting to deal with some stuff in my game that I thought were "minor problems" and one of these are that I get an error every time I shut down my game that looks like this: 09-05 21:40:58.320: E/AndroidRuntime(30401): FATAL EXCEPTION: Thread-4898 09-05 21:40:58.320: E/AndroidRuntime(30401): java.lang.NullPointerException 09-05 21:40:58.320: E/AndroidRuntime(30401): at nielsen.happy.shooter.MainGamePanel.render(MainGamePanel.java:94) 09-05 21:40:58.320: E/AndroidRuntime(30401): at nielsen.happy.shooter.MainThread.run(MainThread.java:101) on these lines is my GameViews rendering-method and the line in my Thread that calls my GameViews rendering-method. Im guessing Something in my surfaceDestroyed(SurfaceHolder holder) is wrong, or maybe Im not ending the tread in the right place. My surfaceDestroyed-method: public void surfaceDestroyed(SurfaceHolder holder) { Log.d(TAG, "Surface is being destroyed"); boolean retry = true; ((MainThread)thread).setRunning(false); while (retry) { try { ((MainThread)thread).join(); retry = false; } catch (InterruptedException e) { } } Log.d(TAG, "Thread was shut down cleanly"); } Also, In my activity for this View my onPaus, onDestoy and onStop are empty, do I maybe need to add something there? The crash occurs when I press my home-button on the phone, or any other button that makes the game stop. But as I understand it the onPaus is called when you press the Home-button.. This is really new territory for me so Im sorry if im missing something obvious or something really big. adding my surfaceCreated method asweel since that is where I start this thread: public void surfaceCreated(SurfaceHolder holder) { controls = new GameControls(this); setOnTouchListener(controls); timer1.schedule(new Task(this), 0, delay1); thread.setRunning(true); thread.start(); } and aslong as this is running, my game is rendering and updating.

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• Problem with creation of scheduled task from IIS6 on SR2003

  - by Morten Louw Nielsen

  Hi, I have also posted this question on stackoverflow, but will also try here, since it might be more system-related I am writing a webapplication using .NET. The webapp creates scheduled tasks using the System.Diagnostics.Process class, calling SCHTASKS.EXE with parameters. I have changed the identity on the app pool, to a specific domain user. The domain-user is local administrator on all the four webservers. From webserver01 I am creating tasks on webserver01 to webserver04. It works perfect for 3-5 days, but then it breaks. It gives me the following errormessage in a messagebox: "The application failed to initialize properly (0xc0000142). Click on OK to terminate the application." If I have the system in the broken state, and I change the identity of the app pool to Domain administrator, it works. As I change it back to my domain-user, it breaks again. If I reboot the server, it works again for the same amount of days, but will break again. It seems like a permission-related problem. I just don't understand why it works sometimes, and sometimes doesn't. I hope someone outthere has seen this problem! Looking forward to hear from you! Kind regards, Morten, Denmark

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• Nginx phpmyadmin redirecting to / instead of /phpmyadmin upon login

  - by Frederik Nielsen

  I am having issues with my phpmyadmin on my nginx install. When I enter <ServerIP>/phpmyadmin and logs in, I get redirected to <ServerIP>/index.php?<tokenstuff> instead of <ServerIP>/phpmyadmin/index.php?<tokenstuff> Nginx config file: user nginx; worker_processes 5; error_log /var/log/nginx/error.log warn; pid /var/run/nginx.pid; events { worker_connections 1024; } http { include /etc/nginx/mime.types; default_type application/octet-stream; log_format main '$remote_addr - $remote_user [$time_local] "$request" ' '$status $body_bytes_sent "$http_referer" ' '"$http_user_agent" "$http_x_forwarded_for"'; access_log /var/log/nginx/access.log main; sendfile on; #tcp_nopush on; keepalive_timeout 2; #gzip on; include /etc/nginx/conf.d/*.conf; } Default.conf: server { listen 80; server_name _; #charset koi8-r; #access_log /var/log/nginx/log/host.access.log main; location / { root /usr/share/nginx/html; index index.php index.html index.htm; } #error_page 404 /404.html; # redirect server error pages to the static page /50x.html # error_page 500 502 503 504 /50x.html; location = /50x.html { root /usr/share/nginx/html; } # proxy the PHP scripts to Apache listening on 127.0.0.1:80 # #location ~ \.php$ { # proxy_pass http://127.0.0.1; #} # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000 # location ~ \.php$ { root /usr/share/nginx/html; try_files $uri =404; fastcgi_pass unix:/tmp/php5-fpm.sock; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; include fastcgi_params; } # deny access to .htaccess files, if Apache's document root # concurs with nginx's one # location ~ /\.ht { deny all; } location /phpmyadmin { root /usr/share/; index index.php index.html index.htm; location ~ ^/phpmyadmin/(.+\.php)$ { try_files $uri =404; root /usr/share/; fastcgi_pass unix:/tmp/php5-fpm.sock; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME $request_filename; include fastcgi_params; fastcgi_param PATH_INFO $fastcgi_script_name; } location ~* ^/phpmyadmin/(.+\.(jpg|jpeg|gif|css|png|js|ico|html|xml|txt))$ { root /usr/share/; } } } (Any general tips on tidying op those config files are accepted too)

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• How to be compliant with Exchange Basic SAL's

  - by Frederik Nielsen

  I am setting up an environment, where some users are on Standard SAL's, and other are on Basic SAL's. But how do I become compliant with the limitations of the Basic SAL? All they should have access to is: Personal mail folders Personal Contacts Personal Calendar Outlook Web Access Is there any powershell script that I can ran for each user, or a step by step guide to it? I am running Exchange 2010 SP2.

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• SMTP port open - but not open

  - by Frederik Nielsen

  As some of you might know, I am setting up an exchange server. Now I ran into another problem: I cannot connect to the SMTP service from outside the server! The ports are opened in the gateway device (a ZyXEL USG50), Windows firewall is off. I see the packets travekl through the ZyXEL firewall, and I can also see the packets with wireshark on the server, so I know they are getting all the way in to the server. I also know it receives them, and sends out the reply - and this is where things go bad! Analyzing with wireshark, I get these errors in the return packets: Header checksum: 0x0000 [incorrect, should be 0x0779 (may be caused by "IP checksum offload"?)] And: Acknowledgment Number: 0x8e3337d1 [should be 0x00000000 because ACK flag is not set] What the (sorry my French) hell is going on? I really cant figure it out.. Thanks in advance.

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• Exchange 2010 SP2 OWA performance

  - by Frederik Nielsen

  How do I increase performance in OWA 2010 SP2? I am running CAS on a seperate installation, which has 8GB RAM and 4 CPU cores - running virtualized in a vmware environment. However, the load times are pretty bad, so is there any way to improve those? I am thinking of installing a linux cache-stuff-server in front of the OWA, but will that work? And how should it be done? Allright, I "fixed" it - was just something temporary issue. Thanks for your replies

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• Exchange 2010 outlook anywhere - shows internal URL

  - by Frederik Nielsen

  I am setting up an Exchange 2010 SP2 for a customer. However, the server address that the server returns with autodiscover is wrong, as it points to the internal domain (.local) - and not the external address. How do I change this? Here's an image to describe what I mean: It is the upper field that is wrong. I dont want users to enable the RPC over HTTP-thing, as the users know barely nothing about computers. Thank you in advance.

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• VNC application/terminal server

  - by sebastian nielsen

  Which software should I use, if I want to set up a linux VNC terminal server that works in this way: The VNC server should be able to accept up to X simultanous connections on the same port 5900. The VNC server should use 640x480 on 8 or 16bit color. When the VNC server receives the connection, it should start a new "session" for a user, and auto-launch a specific linux application for that user. If the application is killed, crashes, or is exited in any way, user should be disconnected (kicked) from server. If the user disconnect, the application should be killed in a "graceful way", that allows the application to cleanup. (There should be no way to "pick up" a old session) Any ideas?

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• MySQL replicate multiple places

  - by Frederik Nielsen

  Very trick task to find a good title for this question, but here goes the q: I have a few development machines, where I develop my PHP applications on, and testing via a local webserver. This works out pretty well for each machine. However, I would like to replicate the DB from my machines to a central location. So, to sum up: DEV1 - CENTRAL DEV2 - CENTRAL DEV3 - CENTRAL CENTRAL - DEV1 CENTRAL - DEV2 CENTRAL - DEV3 I hope this makes sense, as I cannot find an easy way to tell it. Basically, it is a 2-way replication, where all 4 databases contain the same info, and each of them can be updated locally, to then be pushed out to the others. Is this actually doable? All my dev machines are running Windows 7, and my central DB server is running CentOS 6.

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