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  • Hadoop is not able to find JAVA_HOME properly

    - by Shekhar
    I am trying to run hadoop my Ubuntu OS. I have set JAVA_HOME variable in ~/.bashrc file to /usr/lib/jvm/jdk1.7.0_01/ but when I run hadoop namenode -format command it fails with following errors : shekhar@ubuntu:/usr$ hadoop namenode -format Warning: $HADOOP_HOME is deprecated. /host/Shekhar/Softwares/hadoop-1.0.0/bin/hadoop: line 321: /usr/jdk1.7.0_01/bin/java: No such file or directory /host/Shekhar/Softwares/hadoop-1.0.0/bin/hadoop: line 387: /usr/jdk1.7.0_01/bin/java: No such file or directory hadoop tries to locate java command at /usr/jdk1.7.0_01/bin/ path. Clearly somehow it missed /lib/jvm folder. I am not able to understand why and how this is happening. my echo $PATH command gives following output : shekhar@ubuntu:/usr$ echo $PATH /usr/lib/jvm/jdk1.7.0_01/bin:/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/lib/jvm/jdk1.7.0_01/bin:/host/Shekhar/Softwares/hadoop-1.0.0/bin If I run which java command I get following output : shekhar@ubuntu:/usr$ which java /usr/lib/jvm/jdk1.7.0_01/bin/java and echo $JAVA_HOME returns following output : shekhar@ubuntu:/usr$ echo $JAVA_HOME /usr/lib/jvm/jdk1.7.0_01 I would like to know why hadoop is taking JAVA_HOME path incorrectly. Please help...

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  • Running each JUnit test in a separate JVM in Eclipse?

    - by HenryR
    I have a project with nearly 500 individual tests in around 200 test classes. Some of these tests don't do a great job of tearing down their own state after they're finished, and in Eclipse this results in some tests failing. The tests all pass when running the test suite from the command line via Ant. Can I enable 'test isolation' somehow in Eclipse? I don't mind if it takes longer to run. Long term, I will clean up the misbehaving tests, but in the short term I'd like to get the tests working.

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  • Will client JVM for a web service(https) throw an SSL Exception when the server is having a valid ce

    - by ring bearer
    I have a web service deployed on tomcat hosted on a remote server. I have set it up such that it can be accessed only via HTTPS. For this, I generated a Certificate Signing Request (CSR) and used it to get a temporary certificate from VeriSign. My web service client is on my local machine. If I try to access the service it will throw a javax.net.ssl.SSLHandshakeException:unable to find valid certification path to requested target If I install the certificate in to local Java's keystore, the issue will be resolved. My question is if I install a valid SSL certificate from a CA in to my tomcat server, will I get this client-side error even if I do not import the certificate to local key store?

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  • Why reduce the size of the Java JVM thread stack?

    - by djangofan
    I was reading an article on handling Out Of Memory error conditions in Java (and on JBoss platform) and I saw this suggestion to reduce the size of the threadstack. Can anyone explain how "reducing" the size of threadstack will help with a max memory error condition? http://community.jboss.org/wiki/OutOfMemoryExceptions

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  • int datatype in 64bit JVM. Is it more "inefficient" than long?

    - by Zwei Steinen
    I heard that using shorts on 32bit system is just more inefficient than using ints. Is this the same for ints on a 64bit system? Python recently(?) basically merged ints with long and has basically a single datatype long, right? If you are sure that your app. will only run on 64bit then, is it even conceivable (potentially a good idea) to use long for everything in Java?

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  • How can I get Syslogging to work on the JVM?

    - by Synesso
    I want to do syslogging from Java. There is a log4j appender, but it doesn't seem to work (for me anyway ... though Google results show many others with this issue still unresolved). I'm trying to debug the appender, so I've written the following script based upon RFC3164 It runs, but no logging appears in the syslog. // scala import java.io._ import java.net._ val ds = new DatagramSocket() val fullMsg = "<11>May 26 14:47:22 Hello World" val packet = new DatagramPacket(fullMsg.getBytes("UTF-8"), fullMsg.length, InetAddress.getLocalHost, 514) ds send packet ds.close I also tried using /bin/nc, but it doesn't work either. echo "<14>May 26 15:23:83 Hello world" > nc -u localhost 514 The Ubuntu command /usr/bin/logger does work, however. logger -p user.info hello world # logs: May 26 15:25:10 dsupport2 jem: hello world What could I be doing wrong?

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  • Is Perl still a useful, viable language?

    - by Bob
    I know it may have been asked before, but here goes nothing... Is Perl still something that would be considered useful? If someone was a new programmer (either completely new to programming or just a few month/years of experience) would Perl be something to be considered worthwhile to learn? Is Perl still used with frequency? Is it still popular? Or is Perl dying out compared to languages like Python, Ruby, PHP, ASP, .NET, etc.? Basically it boils down to this: Is it still used/is it still used frequently? If yes, is it dying? If no, will it make a come back? Is it something that would be worth learning? How does it compare in demand to languages like Python in both popularity and usability/viability? Could languages like Python or Ruby be considered replacements for Perl? Also, will newer versions of Perl really bring a large improvement to the Perl community, and perhaps bring Perl back to centerstage compared to other languages? EDIT: Okay, I suppose here's a better, reworded question: Is Perl still growing, or is it "dying"? Is it still a language worth learning and using? What projects does it really "shine" in compared to other languages? What makes Perl a language to choose? Essentially: is Perl growing obsolete compared to other languages, and if so, do you expect that to change, or to continue? And thank you to everyone who has answered so far, the discussion has been really interesting!

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  • Building a common syntax and scoping framework.

    - by Ben DeMott
    Hello fellow programmers, I was discussing a project the other day with a colleague of mine and I was curious to see what others had to say or if such a thing already existed. Background There are many programming languages. There are many IDE's and source editors that highlight and edit source code. Following perfectly and exactly the rules of a language to present auto-complete options and understand scopes in the code is rather complex. This task is complex enough that most IDE's implement different source-editors as plugins that often re-implement the same features over and over but in a different way (netbeans). From what I can tell most IDE's and source editors re-implement parsers that use regular expressions, or some meta-syntax Naur Form to describe the languages grammer generically. These parsers are implemented over and over and over again. Question Has anyone attempted to unify or describe a set of features through an API and have a consistent interface to parsing various programming languages and dialects. I'm not describing an IDE - but a consistent API for any program to use to parse and obtain meta-information from the source code. I realize various programming languages offer many different features which are difficult to 'abstract' into a set of features, but I feel this would be a worthwhile venture. It seems to me that this could possibly allow the authors of interpreters to help maintain a central grammer intepreter for their language. the Python foundation could maintain the Python grammer api, ANSI the C grammer api, Oracle the Java grammer API, etc Example usage If this was API existed code documentation generators could theoretically work across all dialects and languages to some level. It wouldn't matter if your project used 5 different languages a single application could document all of them and the comments and doc-tags within. Has anyone attempted this comprehensively?

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  • Benefits of Server-side Coding

    There are numerous advantages to server scripting languages over client side languages in regards to creating web sites that are more compelling compared to a standard static site. Server side scripting are scripts that are executed on a web server during the compilation of data to return to a client. These scripts allow developers to modify the content that is being sent to the user prior to the return of the data to the user as well as store information about the user. In addition, server side scripts allow for a controllable environment in which they can be executed. This cannot be said for client side languages because the developer cannot control the users’ environment compared to a web server. Some users may turn off client scripts, some may be only allow limited access on the system and others may be able to gain full control of the environment.  I have been developing web applications for over 9 years, and I have used server side languages for most of the applications I have built.  Here is a list of common things I have developed with server side scripts. List of Common Generic Functionality Send Email FTP Files Security/ Access Control Encryption URL rewriting Data Access Data Creation I/O Access The one important feature server side languages will help me with on my website is Data Access because my component will be backed with a SQL server database. I believe that form validation is one instance where I might see server-side scripts and JavaScript used interchangeably because it does not matter how or where the data is validated as long as the data that gets inserted is valid. However, I would have to say that my personal experience would have to sway me in deciding what type of languages to use for form validation because they both have advantages and disadvantages based on the each situation.

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  • Maintaining C/C++/Java skills as a web developer

    - by wwwuser
    When I was in college I learned how to program in C, C++, and Java. Currently, I'm a web developer using front end and back end technologies (HTML/CSS/JS, PHP, MYSQL). While the sorting algorithms and OOP concepts that I learned in college can be applied to web development, I'm looking for ways to keep up my knowledge of all languages. I enjoy programming in C-Style (C/C++/Java) languages and front-end/back-end technologies. Unfortunately, there aren't many options to use C-style languages to build websites. However, I would like to keep up my knowledge and skills in the languages I learned in college as I know they will continue to help me with my growth. What resources are available to keep challenging myself in C-style languages that are relevant to web development? Would contract work for C-style languages be beneficial? Are there sites that offer algorithm challenges? Any help is appreciated. I'm also interested in how others that have asked themselves this have solved this problem.

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  • Any Programming Languages Recommendations? A Space shooter game that allows two people to play at the same time?

    - by Bombcode
    Hey Everyone, Do you remember a arcade game, that allow two people to versus or play each other? A Galaga/Gradius type game. Me and a couple of other people I know wanna make a game like this. We want to get some other opinions on what programming languages to use.(C or C++ isn't an option .). We plan to use an engine to help us build. It's gonna be a multiplayer game, so we would be handling the networking with this language as well. We are thinking about C#, Java, or Actionscript 3. Any Advice on this? And if anyone knows the arcade game I am referring to please post up :)! Edit Let me add something here, this game will be plain on computers and laptops only. We mainly wanna what's good for handling the networking and Dual screen play.

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  • What are the real-world benefits of declarative-UI languages such as XAML and QML?

    - by Stu Mackellar
    I'm currently evaluating QtQuick (Qt User Interface Creation Kit) which will be released as part of Qt 4.7. QML is the JavaScript-based declarative language behind QtQuick. It seems to be a very powerful concept, but I'm wondering if anybody that's made extensive use of other, more mature declarative-UI languages like XAML in WPF or Silverlight can give any insight into the real-world benefits that can be gained from this style of programming. Various advantages are often cited: Speed of development Forces separation between presentation and logic Better integration between coders and designers UI changes don't require re-compilation Also, are there any downsides? A few potential areas of concern spring to mind: Execution speed Memory usage Added complexity Are there any other considerations that should be taken into account?

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  • How can i group and display facebook comments done with FB comments plugin on different pages (same page in different languages)?

    - by user1061544
    I use the Facebook comment plugin on my multilingual website. My website's URL contains website language and when someone comments on example.com/en/page.html it is not visible for user who is viewing the same page in French example.com/fr/page.html I want to display all comments done on the page in different languages (different URLs in this case). How can do that?. This is the comment code as it is described here. <div class="fb-comments" data-href="example.com/fr/page.html" data-num-posts="2" data-width="630"></div>

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  • So do programming languages get updated regularly like everyday applications or are they just x.0 re

    - by Randy
    I was wondering if programming languages and frameworks get updated in small increments or are they just x.0 releases? And if they do how do you keep up on all the changes in every update? I am specifically interested in Objective-C and Cocoa and CocoaTouch. I'm learning from books and online PDF's etc, but often they are at best a few years old. I just would like to know if there have been any changes etc. that should concern me and even if not, inevitably there will be, so where can I look out for them?

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  • How can this closure test be written in other languages?

    - by Jian Lin
    I wonder how the following closure test can be written in other languages, such as C and Java. Can the same result be expected also in Perl, Python, and PHP? Ideally, we don't need to make a new local variable such as x and assign it the value of i inside the loop, but just so that i has a new copy in the new scope each time. (if possible). (some discussion is in this question.) The following is in Ruby, the "1.8.6" on the first line of result is the Ruby version which can be ignored. p RUBY_VERSION $foo = [] (1..5).each do |i| $foo[i] = lambda { p i } end (1..5).each do |j| $foo[j].call() end the print out is: [MacBook01:~] $ ruby scope.rb "1.8.6" 1 2 3 4 5 [MacBook01:~] $ Contrast that with another test, with i defined outside: p RUBY_VERSION $foo = [] i = 0 (1..5).each do |i| $foo[i] = lambda { p i } end (1..5).each do |j| $foo[j].call() end the print out: [MacBook01:~] $ ruby scope2.rb "1.8.6" 5 5 5 5 5 [MacBook01:~] $

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  • How to handle right to left languages in Flash (pre version 10)?

    - by Maan Ashgar
    Hello, We are currently working with Flex creating a web application. We are having trouble taking Arabic text from the user and displaying correctly (like in a chat feature). While presumably Flash 10 will solve this problem, we don't want to force our users to upgrade. Flash flips the order of the sentence's words. so if I wrote something like "Hello World" in the text field, it will appear as "World Hello" in the chat area. Is there a standard way to work with Right to Left languages in Flash? *We currently flip the order of the words with a function, but it things get messed up when using English or special characters in the chat like :) or :D *

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  • What languages, frameworks, and technologies have you used to implement document searching?

    - by Bill Brasky
    I am at a new company and one of our goals is to implement a document search portal for our team and our clients. I am a bit worried that if we use an external service provider like Salesforce or some other ECM in the cloud there will be a lot of integration work in the future. From a client perspective, these documents will also exist in the same bucket as our structured content (stored in the DB, not a MS Word doc). If you have implemented document searching, what languages, frameworks, and technologies have you used? Do you have any failure stories? I don't have a problem using something out of the box, but I think it is important that we have control over the documents and the API to access them. I would like to use Rails if we go fully custom.

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  • why don't more programming languages have builtin interfaces to the window manager?

    - by Naveen
    Programming is at the heart about automating tasks on a computer. Presumably those tasks would normally be done manually by a human. Humans use the computer through the keyboard, mouse, and interaction with the console or the window manager. But very few languages have built in functions that provide an interface to these basic computing objects. A notable exception is autohotkey, an open source language on windows, providing builtin functions that allow the following simple tasks: * Get Pixel Information * Get mouse position * Keyboard macros * Simulate key strokes * Simulate mouse click * Window management See examples on rosettacode. There have been various attempts on linux, many of which were stopped without explanation. One is the inactive tcl library: android. Search google code for android, lang:tcl

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  • Why There is a difference between assembly languages like Windows, Linux ?

    - by mcaaltuntas
    I am relatively new to all this low level stuff,assembly language.. and want to learn more detail. Why there is a difference between Linux, Windows Assembly languages? As I understand when I compile a C code Operating system does not really produce pure machine or assembly code, it produces OS dependent binary code.But why ? For example when I use a x86 system, CPU only understands x86 ASM am I right?.So Why we dont write pure x86 assembly code and why there are different assembly variations based on Operating system? If we would write pure ASM or OS produce pure ASM there wouldn't be binary compatilibty issues between Operating systems or Not ? I am really wondering all reasons behind them. Any detailed answer, article, book would be great. Thanks.

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  • What programming languages do you consider indispensable in your experience?

    - by Federico Ramponi
    Each programming language comes with its concepts, best practices, libraries, tools, community, in one word: culture. Learning more than one programming language will make you a better programmer, for the more concepts you learn, the faster you will feel comfortable when the next language or technology will come. Mine, so far, are C, some C++, and Python, and many times I read that it would be worth learning LISP, for "the profound enlightenment experience you will have when you finally get it" (quoting Eric Raymond). My questions are: Which is the next one you would consider a good investment to learn? Of the many programming languages you have learnt and worked with, which ones do you consider to be an essential part of one's CS culture, and why? EDIT. Further question: is there any language you would sincerely advise to avoid as a waste of time? (The famous, and questionable, slatings in this letter from Dijkstra come to my mind.)

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  • Are there any embedded languages that can be embedded into C# and actionscript?

    - by AnthonyF
    I'm looking for a embedded language that can be used to script common code between a server app written in C# and a client app written in Flash/Actionscript. It is important that the embedded language interpreter run natively in the environment it is embedded into. For example, it cannot load any external C libraries (i.e. python, neko). Does such a thing exist for these two languages? Perhaps there is some minimal interpreter that could be easily ported to both? Thanks!

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