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Articles indexed in October 2013

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• Make methods that do not depend on instance fields, static?

  - by m3th0dman

  Recently I started programming in Groovy for a integration testing framework, for a Java project. I use Intellij IDEA with Groovy plug-in and I am surprised to see as a warning for all the methods that are non-static and do not depend on any instance fields. In Java, however, this is not an issue (at least from IDE's point of view). Should all methods that do not depend onto any instance fields be transformed into static functions? If true, is this specific to Groovy or it is available for OOP in general? And why?

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• Consultant - Google Cloud Endpoints

  - by Marc M.

  How does when go along finding a consultant to hire for a few hours for particular technologies? Lets say Google Cloud Endpoints, basically a professional at the library that can answer anything I need to know about it? How much might this cost. Can you hire them for only a couple hours at a time? Or even for a 20 minute phone call like a lawyer? P.S. I could use someone on call for Objectify questions too.

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• Optimising news fetching

  - by aceBox

  I have a web scraper for scraping news from different sources in wp7. My current appraoch for doing this is: load newspapers information from xml file. go to the specified sections and fetch the urls of the news items. go to each url and fetch headline, image, publisher. display using a MVVM architecture of windows phone. The whole thing takes place asynchronously...meaning as soon as url from a section of a newspaper is fetched it is added to the queue, and the second stage consisting of fetching headline, image etc starts... and as soon this is fetched even for one article, it is displayed. Later on as more articles are fetched, they are added on to the list. For the fetching purpose I am using a SmartThreadPool(http://www.codeproject.com/Articles/7933/Smart-Thread-Pool) for windows phone. My problem is that...even for fetching around 80 items (in total) from 9 publications, it is taking more than a minute. How can i speed up the procedure? Note: I have a two stage approach because many times the images are not available with headlines, and are only found in the article.

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• Telecomunication SID model and resources [on hold]

  - by andygluk

  There is a SID model well-known in telecom industry. Following this model you define resources as resources owned by your enterprise, and then you build resource-oriented services on top of it and then customer-oriented services and so on... So everything is based on enterprise-owned resources, which you have to identify first. What I am looking for and what I am asking is some alternative to this model, build not on enterprise-owned resources, but on resources sell by enterprise. Say, you are selling licenses for using your products. So instead of building model on top of enterprise resources you may be interested to build it on top of licenses you are selling.

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• What should a programmer's yearly routine be to maximize their technical skills?

  - by sguptaet

  2 years ago I made a big career change into programming. I learned various technologies on my own without any prior experience. I really love it and feel lucky with all the resources around us to help us learn. Books, courses, open-source, etc. There are so many avenues. I'm wondering what a good routine would be to follow to maximize my software development skills. I don't believe just building software is the way, because that leaves no time for learning new concepts or technologies. I'm looking for an answer like this: Take a new concept sabbatical/workshop 2 weeks per year. Read 1 theoretical and 1 practical programming book per year. Learn 1 additional language every 2 years. Take a 1 week vacation every 6 months. Etc. I realize that the above might sound naive and unrealistic as there are so many factors. But I'd like to know the "recipe" that you think is best that will serve as a guide for people.

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• Check validity Partition in python

  - by fadhil

  I have a question, I really don't understand about partition of set. There are 3 definition that we have to know, and I don't know how to implement the definition into python language. In my case, I have a set of RegionsCode which is set(['Sub-Saharan Africa', 'East Asia & Pacific\n', 'Region\n', 'Middle East & North Africa\n', 'North America\n', 'Latin America & Caribbean\n', 'South Asia\n', 'Sub-Saharan Africa\n', 'Europe & Central Asia\n']) And the question is: Determine if RegionCodes is a valid partition of ?????????????????????? n ??????????????????. There are three steps to showing that a partition is valid, all three steps need to be included here. Output the result of each step to the terminal. I would really appreciate if there is someone helps me.. thank you

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• Is paying programmers to "test" for bugs normal? [on hold]

  - by user106277

  I recently hired a programming team to do a port of my iPad app to the iPhone and Android platforms. I also wanted them to implement a bunch of tips on how to play the app, similar like you would find in Candy Crush or Cut the Rope. They want to charge 12 hours @ $35/hr for the "Testing all of the Tips", telling me that normally it would take them more than 25 hours but that they will 'bear the difference'. I have never heard of this, but maybe it's a new practice? I am used to devs doing their own quality control, and then having a testing/acceptance period... Am I missing something? Thanks for any help and advice you can give!

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• Is it possible to create a single tokenizer to parse this?

  - by Adrian

  This extends off this other Q&A thread, but is going into details that are out of scope from the original question. I am generating a parser that is to parse a context-sensitive grammar which can take in the following subset of symbols: ,, [, ], {, }, m/[a-zA-Z_][a-zA-Z_0-9]*/, m/[0-9]+/ The grammar can take in the following string { abc[1] }, } and parse it as ({, abc[1], }, }). Another example would be to take: { abc[1] [, } and parse it as ({, abc[1], [,, }). This is similar to the grammar used in Perl for the qw() syntax. The braces indicate that the contents are to be whitespace tokenized. A closing brace must be on its own to indicate the end of the whitespace tokenized group. Can this be done using a single lexer/tokenizer, or would it be necessary to have a separate tokenizer when parsing this group?

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• Where to start for writing a simple java IDE?

  - by AedonEtLIRA

  I would like to start working on my own custom IDE. The biggest reason I want to work on the IDE is to help me gain an even greater, more intimate understanding of java (and other languages I add into it.) I don't want to do anything super fancy or revolutionary, I'd be happy if I could create something as compact as the BlueJ IDE I used in high school and be content. I have a few question on the specifics of the task that I hope I can get cleared up before I start investing time in this: Is there anything I should be aware of when writing the parser? Does anyone have any pointers that I should be aware of; pitfalls, brick walls or other constraints?

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• License compatibility question

  - by Ivaylo Slavov

  I have a question regarding software licenses. I plan to put a license to a framework that I have written. My intention is that the license should be open, in order to maintain a community. Also I want to control when a new version is released and which changes will be included. The license should allow the framework to be used with commercial products, therefore respecting their own license. I have done some quick research and I decided to double license my work under the Apache License 2.0 (ASL) and Eclipse Public License (EPL). My point is that the EPL will provide me the ability to control the release cycle as well as the contributions to the project and the Apache license will take care for any patents a 3rd party might want to use in a derived work. Also both are open licenses. My question is related to the GLP and LGPL licenses. If I have the above licenses to my framework, will it be possible and legal, for someone to create a derived work of my framework, that is also a derived work of, or links a library that is under the LGPL license? Thanks in advance. EDIT: To be clear I will explain how I expect things to work. The framework will define some common API for certain functionalities as well as a Wrapper class that will invoke an implementation of that API. The Wrapper will be part of the framework, but it will internally call the actual implementation. This implementation should be in a separate library, and such libraries I would like to be developed and maintained by community. Surely the community will have to access the framework but I want to limit changes to the framework by the community but I want to provide freedom for any API implementation (a derived work of the framework). The framework will enable flexible configuration mechanisms that will tell which implementation of an API will be used.

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• why there is no power operator in java / c ++?

  - by RanZilber

  While there is such operator - ** in Python , i was wondering why java and c++ havent got one too. It is easy to make one for classes you define in C++ with operator overloading ( and i believe such thing is possible also in java) , but when talking about primitive types such as int, double and so on , you'll have to use library function like Math.power (and usaully have to cast both to double). So - why not define such operator for primitive types ?

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• Extend gnome-control-center’s list of keyboard layouts

  - by MPi

  While looking for my problem of Keyboad layout: In 13.10, modified symbols do not apply, I noticed that gnome-control-center region layouts has a list of keyboard layouts that is not directly related to the ones found in /usr/share/X11/xkb/symbols. For example, on my German machine it lists ‘Englisch (Colemak)’ and ‘English (Britisch, Colemak)’ as keyboard layouts, both are not found in the original files, but obviously translations. So, my question is: Where does gnome-control-center get its list of keyboard layouts from? Can it be extended?

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• Juju bootstrap fails for Windows Azure

  - by tomconte

  I am trying to play with Juju on Windows Azure. I did the configuration part, however the boostrap fails on a network configuration error: 2013-10-29 10:08:49 ERROR juju supercommand.go:282 PUT request failed: BadRequest - XML Schema validation error in network configuration at line 75,18. (http code 400: Bad Request) How can I troubleshoot? Can I find somewhere the XML file to examine it? Thanks! Thomas.

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• Keyboad layout: In 13.10, modified symbols do not apply

  - by MPi

  I like to tweak my Colemak layout a bit, so I changed /usr/share/X11/xkb/symbols/us to contain my changes. Sure, they get lost on an upgrade, but that is not very often. After upgrading to 13.10, this does not work anymore. I changed the file, but the changes are not applied. Neither when I use the settings program, nor when I issue setxkbmap 'us(colemak)' directly. Where is this data stored now, is there some kind of cache?

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• UDEV: how to match SYMLINK during remove event?

  - by Magicloud

  I am using libusb to contact with a printer. And I am writing a rule for udev to remove the printer when it is disconnected. I use symlink to indicate the device. But when removing, the rule is not triggered. What should I do? ATTRS{manufacturer}=="Zebra Technologies", ACTION=="add", RUN+="/usr/local/bin/reinitZebra.sh", SYMLINK+="usblp%k" SYMLINK=="usblp%k", ACTION=="remove", RUN+="/usr/local/bin/reinitZebra.sh"

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• Transmission window freezes

  - by eyeinthebrick

  I'm using Xubuntu 13.10, although this problem was in 13.04 too. The thing is that Transmission window freezes sometimes and makes computer not response. This problem appears, when Transmission creates another window, e.g. for preferences, or for choosing files to be downloaded. What might be the reason for the problem? After reading similar questions, I think the reason might be that I download files to ntfs partition.

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• Ubuntu 12.04 LTS initramfs-tools dependency issue

  - by Mike

  I know this has been asked several times, but each issue and resolution seems different. I've tried almost everything I could think of, but I can't fix this. I have a VM (VMware I think) running 12.04.03 LTS which has stuck dependencies. The VM is on a rented host, running a live system so I don't want to break it (further). uname -a Linux support 3.5.0-36-generic #57~precise1-Ubuntu SMP Thu Jun 20 18:21:09 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux Some more: sudo apt-get update [sudo] password for tracker: Reading package lists... Done Building dependency tree Reading state information... Done You might want to run ‘apt-get -f install’ to correct these. The following packages have unmet dependencies. initramfs-tools : Depends: initramfs-tools-bin (< 0.99ubuntu13.1.1~) but 0.99ubuntu13.3 is installed E: Unmet dependencies. Try using -f. sudo apt-get install -f Reading package lists... Done Building dependency tree Reading state information... Done Correcting dependencies... Done The following extra packages will be installed: initramfs-tools The following packages will be upgraded: initramfs-tools 1 upgraded, 0 newly installed, 0 to remove and 2 not upgraded. 2 not fully installed or removed. Need to get 0 B/50.3 kB of archives. After this operation, 0 B of additional disk space will be used. Do you want to continue [Y/n]? Y dpkg: dependency problems prevent configuration of initramfs-tools: initramfs-tools depends on initramfs-tools-bin (<< 0.99ubuntu13.1.1~); however: Version of initramfs-tools-bin on system is 0.99ubuntu13.3. dpkg: error processing initramfs-tools (--configure): dependency problems - leaving unconfigured No apport report written because the error message indicates it's a follow-up error from a previous failure. dpkg: dependency problems prevent configuration of apparmor: apparmor depends on initramfs-tools; however: Package initramfs-tools is not configured yet. dpkg: error processing apparmor (--configure): dependency problems - leaving unconfigured No apport report written because the error message indicates it's a follow-up error from a previous failure. Errors were encountered while processing: initramfs-tools apparmor E: Sub-process /usr/bin/dpkg returned an error code (1) If I look at the policy behind initramfs-tools / bin I get: apt-cache policy initramfs-tools initramfs-tools: Installed: 0.99ubuntu13.1 Candidate: 0.99ubuntu13.3 Version table: 0.99ubuntu13.3 0 500 http://gb.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages *** 0.99ubuntu13.1 0 100 /var/lib/dpkg/status 0.99ubuntu13 0 500 http://gb.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages apt-cache policy initramfs-tools-bin initramfs-tools-bin: Installed: 0.99ubuntu13.3 Candidate: 0.99ubuntu13.3 Version table: *** 0.99ubuntu13.3 0 500 http://gb.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages 100 /var/lib/dpkg/status 0.99ubuntu13 0 500 http://gb.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages So the issue seems to be I have 0.99ubuntu13.3 for initramfs-tools-bin yet 0.99ubuntu13.1 for initramfs-tools, and can't upgrade to 0.99ubuntu13.3. I've performed apt-get clean/autoclean/install -f/upgrade -f many times but they won't resolve. I can think of only 2 other 'solutions': Edit the dpkg dependency list to trick it into doing the installation with a broken dependency. This seems very dodgy and it would be a last resort Downgrade both initramfs-tools and initramfs-tools-bin to 0.99ubuntu13 from the precise/main sources and hope that would get them in step. However I'm not sure if this will be possible, or whether it would introduce more issues. I'm not sure how this situation arise in the first place. /boot was 96% full; it's now 56% full (it's tiny - 64MB ... this is what I got from the hosting company). Can anyone offer advice please?

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• Cannot Start My System

  - by KrishArora

  I have installed Ubuntu Studio 13.10 installed on my system. Today I have rebooted it and now it is not starting or booting again, the logo is seen and there appears an error message that says :- [23.755113] systemd-udevd[329]: inotify_add_watch(6, /dev/sdb, 10) failed. No such file or directory After this message the system doesn't start. I have done a boot repair through live CD, but that also doesn't helps me. Here is the link of the boot repair process. Please help me how to restore my system without loosing my data

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• New to world of Ubuntu

  - by Michael Raymond Cheney

  I've been running Ubuntu 13.04 since June 2013, and upgrading to 13.10 as we speak.(Note I own total 3 laptops.) My goal is to have one complete Linux machine and one dual boot, and third well (he is a newer Lenovo with Windows 8.1 and is touch screen.) but I want to learn Ubuntu life and further myself with using it for everyday use, but I'm not very fluid in Linux usage and hoping to find people who have a love for teaching others how to be one with the BEST OS IN THE WORLD! Hope I've got few people wanting to teach or give good instruction for success. ~Mike Cheney~

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• Nginx unable to connect

  - by nish

  I am referring to this link to install Nginx on Ubuntu: Installing Nginx With PHP5 (And PHP-FPM) And MySQL Support (LEMP) On Ubuntu 13.04. sudo su — Runs OK. apt-get install mysql-server mysql-client mysql-client is already the newest version. mysql-server is already the newest version. Yet when I try http://localhost on Firefox it does not show the welcome page. (That is Nginx is not running). Unable to connect Firefox can't establish a connection to the server at localhost.

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• I'm trying to install Bruteforce Savedata from the archiver

  - by Jonathan

  I've just installed UBUNTU 12.04 for curiosity purposes. I'm a gamer and I wanted to install Brute force Save data on my comp. So i download it and it open in the Archive manager i go to run the ".exe" but encounter this message Archive: /home/c4/Desktop/Bruteforce_Save_Data_installer.exe [/home/c4/Desktop/Bruteforce_Save_Data_installer.exe] End-of-central-directory signature not found. Either this file is not a zipfile, or it constitutes one disk of a multi-part archive. In the latter case the central directory and zipfile comment will be found on the last disk(s) of this archive. zipinfo: cannot find zipfile directory in one of /home/c4/Desktop/Bruteforce_Save_Data_installer.exe or /home/c4/Desktop/Bruteforce_Save_Data_installer.exe.zip, and cannot find /home/c4/Desktop/Bruteforce_Save_Data_installer.exe.ZIP, period. Please help!

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• Problems installing 13.10 inside VMWare Player 4

  - by Thomas S.

  In the past I had no problems installing Ubuntu 12.04 inside VMWare Player 4.0.4 on my Windows 7 Pro machine. Now I installed Ubuntu 13.10 and have a couple of problems: the default screensize (even during the installation) is gigantic I've told Ubuntu to automatically login - after reboot the gigantic screen occurs without showing anything, without doing anything on mouse clicks, Ctrl+Alt+Backspace does not work switching to console using Ctrl+Alt+F1...F6 works, but is incredible slow invoking 'sudo reboot now' does not succeed, it prints Killing all remining processes... [fail] Restoring resolver state... [ OK ] Will now switch to single-user mode root@ubuntu1310:~# invoking now 'shutdown now' will soon show the same error. What I need to do to get Ubuntu 13.10 up and running in VMWare Player?

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• Lubuntu: How do I autostart xfce4 power manager?

  - by user203766

  I just upgraded my 64 bit Lubuntu to 13.10 on my netbook today. After the upgrade, I simply can't autostart the xfce4 power manager. I tried to add from the desktop session settings, I tried to copy the power manager.desktop file to ~/.config/autostart folder. Everything looks fine. Then I logout, log back in and the darn power manager just won't start automatically. It only starts when I double click the icon, or if I start it from the terminal.

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• Upgrade from 12.04 to 13.10: Computer won't boot

  - by Christian

  I upgraded from 12.04 to 13.10 and my computer boots to a black screen. I hear the drumroll, but there is no functionality after that. I've downloaded a livecd of 12.04 on my other computer, and I changed the BiOS settings to boot from CD/DVD first, but it still does the same thing. I booted advanced options, edited [ro quick splash] to [ro nomodeset] and it started normally. I rebooted the system and it was back to the same junk. What do I need to do while it is operating to make it reliable with every restart? This seems to be a systemic issues with NUMEROUS Ubuntu upgrades, but I haven't read a solution yet. I need some help, please! Thanks.

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• Setting a display's backlight brightness to be lower than is possible via the normal brightness controls

  - by Drew Noakes

  By normal brightness controls I mean the accelerators on my laptop's keyboard that seem to integrate with Unity. In a dark room, my screen is quite bright, even on the lowest setting. Can I override this? I tried setting it explicitly via both: sudo echo 500 > /sys/class/backlight/acpi_video0/actual_brightness sudo echo 500 > /sys/class/backlight/intel_backlight/actual_brightness But I get a permission denied error. When at the lower bounds via my keyboard's brighness controls, acpi_video0/actual_brightness is 0, and intel_backlight/actual_brightness is 729. Can I set the latter value to be even lower?

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