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  • can anyone help me through the preparation of Eclipse IDE for android developer in ubuntu 12.04?

    - by csbl
    I'm new to to Linux, in this particular case, to Ubuntu. I have a small android project I have to finnish until this Friday and I'm still stuck with the install and preparing of the development envrironment. The only thing I did was install the Eclipse IDE. I'm still missing the SDK, JAVA and anything else that might be needed. Can someone help me through this? It's only because I'm running out of time to develop, or else I would embarc on a deeper investigation of this OS. I tried the step to install android platforms, through Eclispe-Help-Install New Software, and I got the follwoing error messages, at the end of the process: [2012-06-06 17:35:56 - adb] /home/catia/android-sdks/platform-tools/adb: error while loading shared libraries: libncurses.so.5: cannot open shared object file: No such file or directory [2012-06-06 17:35:56 - adb] 'adb version' failed! /home/catia/android-sdks/platform-tools/adb: error while loading shared libraries: libncurses.so.5: cannot open shared object file: No such file or directory [2012-06-06 17:35:56 - adb] Failed to parse the output of 'adb version': Standard Output was: Error Output was: /home/catia/android-sdks/platform-tools/adb: error while loading shared libraries: libncurses.so.5: cannot open shared object file: No such file or directory [2012-06-06 17:35:56 - adb] /home/catia/android-sdks/platform-tools/adb: error while loading shared libraries: libncurses.so.5: cannot open shared object file: No such file or directory [2012-06-06 17:35:56 - adb] 'adb version' failed! /home/catia/android-sdks/platform-tools/adb: error while loading shared libraries: libncurses.so.5: cannot open shared object file: No such file or directory [2012-06-06 17:35:56 - adb] Failed to parse the output of 'adb version': Standard Output was: Error Output was: /home/catia/android-sdks/platform-tools/adb: error while loading shared libraries: libncurses.so.5: cannot open shared object file: No such file or directory Can anyone help, please??

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  • How can I make feasible the deployment of my application on the servers

    - by aklin81
    I am a Java Web Application Developer. I have an idea for a web application project that I am working on. I personally believe that the app has potential to become a popular website. Currently I am working on it as a developer with two others in the project. The development costs has been almost null uptil now since we are doing in-house development with open source technologies. But the costs are now going to appear as we'll have to host our application online on the servers. Right now I see this as the major expense as we go live. Are there any ways by which we can smartly deal with this hurdle ? We want to minimize the costs as much as possible, or even better, if we can make this null, perhaps, through some partnership agreement with the hosting solutions provider!? Your opinions are highly solicited!! Please enlighten with your experiences and knowledge. Thanks so much, for your time !

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  • What is the best approach for inline code comments?

    - by d1egoaz
    We are doing some refactoring to a 20 years old legacy codebase, and I'm having a discussion with my colleague about the comments format in the code (plsql, java). There is no a default format for comments, but in most cases people do something like this in the comment: // date (year, year-month, yyyy-mm-dd, dd/mm/yyyy), (author id, author name, author nickname) and comment the proposed format for future and past comments that I want is: // {yyyy-mm-dd}, unique_author_company_id, comment My colleague says that we only need the comment, and must reformat all past and future comments to this format: // comment My arguments: I say for maintenance reasons, it's important to know when and who did a change (even this information is in the SCM). The code is living, and for that reason has a history. Because without the change dates it's impossible to know when a change was introduced without open the SCM tool and search in the long object history. because the author is very important, a change of authors is more credible than a change of authory Agility reasons, no need to open and navigate through the SCM tool people would be more afraid to change something that someone did 15 years ago, than something that was recently created or changed. etc. My colleague's arguments: The history is in the SCM Developers must not be aware of the history of the code directly in the code Packages gets 15k lines long and unstructured comments make these packages harder to understand What do you think is the best approach? Or do you have a better approach to solve this problem?

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  • Help in (re)designing my Swing application

    - by Harihar Das
    I have developed a Swing application that controls execution of several script like jobs. I need to display the interim output of the jobs concurrently. I have followed MVC while writing the application. The application is working as expected. But off late I have the following requirements in hand: A few of the script jobs need special user privileges to execute so as to access specialized resources. There seems to be now way in Java to impersonate as a different user while running an application.[examined in this question]. Also trying to run the Swing application as a scheduled task in windows is not helping. Once started the jobs should be running even if the user logs off after starting the jobs. I am thinking of separating the execution logic from the UI and run that as a service; and introduce JMS in between the two layers so as to store/retrieve the interim the output. Note: I need to run this application on windows Any ideas on meeting my requirements will be highly appreciated.

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  • Live examples of the Windows Azure Platform running Java and Ruby on Rails

    - by Eric Nelson
    At QCon in March we had a booth focused on interoperability out of which came the idea to create an application implemented in both Java and Ruby on Rails, running on top of the Windows Azure Platform. Nothing fancy, just an application to capture attendees view on Microsoft and Interoperability. It was implemented by Active Web Solutions, long time fans of Azure. Wroth a quick squint :-) Check out the related links below for info to get you up and running. Check out The Java version http://ukinterop.cloudapp.net/  The Ruby on Rails version http://rubyukinterop.cloudapp.net/ (run out of time to finish this one) Related Links: Tomcat Solution Accelerator http://code.msdn.microsoft.com/winazuretomcat AzureRunMe http://azurerunme.codeplex.com/ UK Azure Online Community – join today. UK Windows Azure Site Start working with Windows Azure

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  • Is mocking for unit testing appropriate in this scenario?

    - by Vinoth Kumar
    I have written around 20 methods in Java and all of them call some web services. None of these web services are available yet. To carry on with the server side coding, I hard-coded the results that the web-service is expected to give. Can we unit test these methods? As far as I know, unit testing is mocking the input values and see how the program responds. Are mocking both input and ouput values meaningful? Edit : The answers here suggest I should be writing unit test cases. Now, how can I write it without modifying the existing code ? Consider the following sample code (hypothetical code) : public int getAge() { Service s = locate("ageservice"); // line 1 int age = s.execute(empId); // line 2 return age; // line 3 } Now How do we mock the output ? Right now , I am commenting out 'line 1' and replacing line 2 with int age= 50. Is this right ? Can anyone point me to the right way of doing it ?

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  • Has anyone else read "Programming video games for the Evil Genius"

    - by Martin
    I bought this book called "Programming Video Games for the Evil Genius" by Ian Cinnamon. If there is anyone who has read or is familiar with this book I am wondering if they think it is worth reading. I am interested in making video games. I have already taken intro courses in C++, Java and Python and got through okay. I've been going through this book for about a month now(SLOWLY). All I have to do is type the code exactly in the book, BUT a lot of the code is not clearly explained. I do some research online but I usually still have some trouble answering my questions. Then I found stack overflow. It's been a ton of help. Right now I am trying to make a racing game right out of this book and I got to a point where the author left a bunch of errors in his code. One of the members of this website fixed it up for me, but added some stuff that I'm having trouble understanding. I spend more time trying to figure out the authors errors and fix them or get someone to help me fix them than I actually do learning code. I REALLY want to learn how to do this and I am ready and willing to put in the time, but I'm not sure if my time would be better spent learning from a different source. Are there any veterans out there that are familiar with this book and think it's worth it/not worth it? Should I try to move onto another book? Any advice for a fresh start for someone who wants to learn some video game programming?

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  • "Don't do programming after a few years of starting career" Is this a fair advice?

    - by Muhammad Yasir
    I am a little experienced developer having around 5 years experience in PHP and somewhat less in Java, C# and trying to learn some Python now a days. Since the start of my career as a programmer I have been told every now and then by fellow programmers that programming is suitable for a few early years of carrier (most of them take it as 5 years) and that one must change the direction after it. The reason they present is that headaches and pressures associated with programming. They also say that programmers are less social and don't usually like to give time to their families etc. and specially "Oh come on, you can not do programming in your entire life!" I am somewhat confused here and need to ask others about it. If I leave programming then what do I do?! I guess teaching may be a good option in this case but it will require to first earn a PhD degree perhaps. It may also be noteworthy that in my country (Pakistan) the life of a programmer is not very good in that normally they must give 2-3 extra hours in office to accomplish urgent programming tasks. I have a sense that situation is somewhat similar in other countries and regions as well. So the question is, do you think it is a fair advice to change career from programming to something else after spending 5 years in this field? Thanks for sharing thoughts!

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  • Best Persistence choice for J2EE-App with frequently changing Data Model

    - by Ben-G
    Whenever I develop a J2EE-Application, I at some point decide to switch from my dummy Persistence (Simply Using Lists and other Data Structures) to some Sort of Database Persistence. Mostly when I hope the Data Model is more or less complete. From this point on, changes to the data model become exhausting, but unluckily they occur rather often. I've used different Object-Relational-Mappers (iBatis, Hibernate) for my projects. They definitely reduce the pain coming with Data Model changes, but they anyway let me adjust code/configuration at 3 or 4 places for every single change. To me, that's cumbersome and error prone. I made a better experience with DB4O, which simply persists Java Objects as they are, but I believe it's performance does not scale for huge applications. Is there anyway to maintain performance while letting out all the ugly configuration work? I'm seeking a performant framework which really hides persistence from my code. Wish for thinking? Or am I missing out THE technology? Hope you can help.

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  • Where should I put bindings for dependency injection?

    - by Mike G
    I'm new to dependency injection and though I've really liked it so far, I'm not sure where bindings should go. I'm using Guice in Java, so some of what I say might be specific to just Guice. As I see it, there's two options: Accompanying the class(s) its needed for. Then, just write install(OtherClassModule.class) in whatever other modules want to be able to use said class. As I see it, the advantage of this is that classes that want to use it (or manage classes that want to use it) don't need to know any of the implementation detail. The issue I see is that what if two classes want to use two different versions of the same class? There's a lot of customization possible because of DI and this seems to restrict it a lot. Implemented in the module of the class(s) its needed for. It's the flip of what I said above. Now you have customization, but not encapsulation. Is there a third option? Am I misunderstanding something obvious? What's the best practice?

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  • RESTful Java on Steroids (Parleys, Podcast, ...)

    - by alexismp
    As reported previously here, the JAX-RS 2.0 (JSR 339) expert group is making good progress. If you're interested in what the future holds for RESTful Java web services, you can now watch Marek's Devoxx presentation or listen to him in the latest Java Spotlight Podcast (#74). Marek discusses the new client API, filters/handlers, BeanValidation integration, Hypermedia support (HATEOAS), server-side async processing and more. With JSR 339's Early Draft Review 2 currently out, another draft review is planned for April, the public review should be available in June while the final draft is currently scheduled for the end of the summer. In short, expect completion sometime before the end of 2012.

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  • EL 3.0 Public Review - JSR 341 and Java EE 7 Moving Along

    - by arungupta
    Following closely on the lines of EL 3.0 Early Draft, the specification is now available for a Public Review. The JCP2 Process Document defines different stages of the specifications. This review period closes Jul 30, 2012. Some of the main goals of the JSR are to separate ELContext into parsing and evaluation contexts, adding operators like equality, string concatenation, etc, and integration with CDI. The section A.7 of the specification highlights the difference between Early Draft and Public Review. Download the Public Review and and follow the updates at el-spec.java.net. For more information about EL 3.0 (JSR 341), check out the JSR project on java.net. The archives of EG discussion are available at jsr341-experts and you can subscribe to the users@el-spec and other aliases on the Mailing Lists page.

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  • JEE frameworks, a road map to learn? and should I learn them?

    - by vibhor
    Background Information I have been into programming since past 1 years professionally, my day to day work includes writing BIRT reports, designing and validating forms using JEE (struts/spring, hibernate). I don't have a comp Sci 4 year degree (Electronics), so I have very Limited experience in comp Sci. Question JEE frameworks (struts1/2, spring, hibernate etc) are hot nowadays, however java world have a tendency of building A4j, B4J... mayway4J kind of stuff (and I am tired of it). AFAIK, frameworks are nothing but bunch of XML config files and hundreds of classes built to cram (by developer). And sooner then later a new framework come into picture that says I am the best among all. So My Question is - 1.What will you do to learn a framework (many frameworks) considering that it can be obsolete till you'll be master in it (Learning frameworks can take significant amount of time)? 2.Considering early into your career, will you give a damn that how well someone knows framework (knowing frame work is important but still..) and why/how should I learn a framework knowing I have to (un)learn it in order to learn other one (plenty of of 4Js....)? I am just trying to get a big picture, that, if you're in place of me, what would be your learning/cramming strategy (Road map)? I am not intended to start a holy war between A versus B, (frameworks are more or less essential).

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  • Server-side Architecture for Online Game

    - by Draiken
    Hi, basically I have a game client that has communicate with a server for almost every action it takes, the game is in Java (using LWJGL) and right now I will start making the server. The base of the game is normally one client communicating with the server alone, but I will require later on for several clients to work together for some functionalities. I've already read how authentication server should be sepparated and I intend on doing it. The problem is I am completely inexperienced in this kind of server-side programming, all I've ever programmed were JSF web applications. I imagine I'll do socket connections for pretty much every game communication since HTML is very slow, but I still don't really know where to start on my server. I would appreciate reading material or guidelines on where to start, what architecture should the game server have and maybe some suggestions on frameworks that could help me getting the client-server communication. I've looked into JNAG but I have no experience with this kind of thing, so I can't really tell if it is a solid and good messaging layer. Any help is appreciated... Thanks !

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  • Where to store global enterprise properties?

    - by shylynx
    I'm faced with a crowd of java applications, which need different global enterprise wide properties for operation, for example: hostname of the central RDBMS, hostname and location of the central self-service portal, host location of central LDAP, host location of central mail server etc. Formally we build each application with a properties file, where all this properties are definied. But that's a very bad solution, because if the hostname of the mail server changes, we need to change the properties files for each application and deploy all applications again. Our idea is to centralize this properties, so that each application can ask for each property at runtime, for example: Idea: Put the properties file to an easy accessible file share. So if we need to change a property, each application uses the new properties. Idea: Put the properties to database. Main disadvantage: we need a dependency to database client libraries for each application. Idea: Put all applications into one big application server, that provides system properties for each application. Main disadvantage: needs deployment of each application to one application server. But that isn't a realistic scenario. Idea: Webservice that provides global enterprise wide properties. Main disadvantage: not very secure, because some properties are passwords or user credentials. What other alternatives are recommended? What is state of the art?

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  • How to solve SocketException: Permission denied: connect

    - by luxinxian
    I recently encountered a problem getting a headache, need help... System consists of: Two subsystems, called A, B (each running on a standalone tomcat instance), currently running on the same machine. A invoke B's service via spring httpInvoker(http). B system also invoke other system's services via http. Symptoms: 1, the system starts to run normally after 10-15 days; 2, the system will run for a period of time after an exception: org.springframework.remoting.RemoteAccessException: Could not access HTTP invoker remote service at [http://xxx.xxx.xxx.xxx/remoting/call]; nested exception is java. net.SocketException: Permission denied: connect 3, when the exception occour, it continues, not only occasional .(it looks like some resources exhausted, but cpu rate < 5%, memory < 15%, network < 5%) 4, A, B when the system call fails, B system via http call to an external service also failed for the same exception. 5, closed two tomcat services, restart, and working properly. So repeatedly (step 1 - 5), has not found the root reason. Emvironment: windows 2008 R2 tomcat7.0.42 x86_64 oralce-jdk-1.7.0_40 Any ideas?

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  • program logic of printing the prime numbers

    - by Vignesh Vicky
    can any body help to understand this java program it just print prime n.o ,as you enter how many you want and it works good class PrimeNumbers { public static void main(String args[]) { int n, status = 1, num = 3; Scanner in = new Scanner(System.in); System.out.println("Enter the number of prime numbers you want"); n = in.nextInt(); if (n >= 1) { System.out.println("First "+n+" prime numbers are :-"); System.out.println(2); } for ( int count = 2 ; count <=n ; ) { for ( int j = 2 ; j <= Math.sqrt(num) ; j++ ) { if ( num%j == 0 ) { status = 0; break; } } if ( status != 0 ) { System.out.println(num); count++; } status = 1; num++; } } } i dont understand this for loop condition for ( int j = 2 ; j <= Math.sqrt(num) ; j++ ) why we are taking sqrt of num...which is 3....why we assumed it as 3?

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  • Continuous integration never results in build errors

    - by Jon
    Hi, I'm working with a variety of Java EE websites which use internal libraries we've developed. For each website, we only upgrade to new versions of our internal libraries as needed, and before committing we make sure that the site compiles fine. What this means is that when TeamCity does a build of one of our sites, the site compiles fine, but later when the site is updated to the latest version of internal libraries, there might be a compile error. Is there a good way to handle this? We're not using Maven yet; would using Maven mean that our websites could automatically use the latest version of internal libraries? Thanks. Clarification: What we sometimes run into is this: Project A depends on a library, and is currently using library version 1.0 Project B also depends on that library. I make changes to the library so that it is now version 1.5. Project B now uses 1.5. Project A and project B have both been built just fine by the CI server (TeamCity) Working on project A again, I update to 1.5 and discover that 1.5 has breaking changes in it. Is there a way for the CI server to discover these kinds of breaking changes?

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  • How can I install oracle-java7 from webupd8 ppa?

    - by Ahmed Zain El Dein
    I installed ppa:webupd8team/java and I get the following error Output from: sudo apt-get install oracle-java7-installer Reading package lists... Done Building dependency tree Reading state information... Done Suggested packages: binfmt-support visualvm ttf-baekmuk ttf-unfonts ttf-unfonts-core ttf-kochi-gothic ttf-sazanami-gothic ttf-kochi-mincho ttf-sazanami-mincho ttf-arphic-uming The following packages will be upgraded: oracle-java7-installer 1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. 1 not fully installed or removed. Need to get 0 B/16.0 kB of archives. After this operation, 64.5 kB of additional disk space will be used. Could not exec dpkg! E: Sub-process /usr/bin/dpkg returned an error code (100) i did afterwords those line of code trying to resolve the issue becuase it is not existed actually in the /usr/bin/dpkg there is no dpkg mkdir /tmp/dpkg cd /tmp/dpkg wget http://archive.ubuntu.com/ubuntu/pool/main/d/dpkg/dpkg_1.15.5.6ubuntu4_i386.deb ar x dpkg*.deb data.tar.gz tar xfvz data.tar.gz ./usr/bin/dpkg sudo cp ./usr/bin/dpkg /usr/bin/ sudo apt-get update sudo apt-get install --reinstall dpkg then i get this $ sudo apt-get install --reinstall dpkg Reading package lists... Done Building dependency tree Reading state information... Done 0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 6 not upgraded. 1 not fully installed or removed. Need to get 0 B/1,814 kB of archives. After this operation, 0 B of additional disk space will be used. dpkg: warning: 'dpkg-deb' not found on PATH. dpkg: 1 expected program(s) not found on PATH. NB: root's PATH should usually contain /usr/local/sbin, /usr/sbin and /sbin. E: Sub-process /usr/bin/dpkg returned an error code (2) How can I fix this?

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  • How do I make time?

    - by SystemNetworks
    I wanted to output a text for a certain amount of time. One way is to use threads. Are there any other ways? I can't use threads for slick2d. This is my code when I use threads for slick: package javagame; import org.newdawn.slick.GameContainer; import org.newdawn.slick.Graphics; import org.newdawn.slick.Image; import java.util.Random; import org.newdawn.slick.Input; import org.newdawn.slick.*; import org.newdawn.slick.state.*; import org.lwjgl.input.Mouse; public class thread1 implements Runnable { String showUp; int timeLeft; public thread1(String s) { s = showUp; } public void run(Graphics g) { try { g.drawString("%s is sleeping %d", 500, 500); Thread.sleep(timeLeft); g.drawString("%s is awake", 600,600); } catch(Exception e) { } } @Override public void run() { // TODO Auto-generated method stub run(); } } It auto generates a new run() And also when I call it to my main class it has stack overflow!

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  • New Java EE/GlassFish Testimonial

    - by reza_rahman
    As you may be aware, we have been making a concerted effort to ask successful Java EE/GlassFish adopters to come forward with their stories. A number of such stories were shared at this year's GlassFish Community event at JavaOne. In addition to Adam Bien's testimonial (which we posted earlier), another story that really stands out is the one from Stephan Janssen. Stephan is one of the main organizers of Devoxx and the webmaster of the popular Parleys e-learning platform. Parleys, which won the Duke's Choice award this year, runs on GlassFish as does the Devoxx CFP/registration website. Stephan's story is particularly interesting because he talks about his reasons and experience of moving from Tomcat to GlassFish and from Spring to Java EE. See what Stephan had to say here.

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