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  • What kind of knowledge you need to invent a new programming language?

    - by systempuntoout
    I just finished to read "coders at works", a brilliant book by Peter Seibel with 15 interviews to some of the most interesting computer programmers alive today. Well, many of the interviewees have (co)invented\implemented a new programming language. For example: * Joe Armstrong: Inventor of Erlang * L. Peter Deutsch: implementer of Smalltalk-80 * Brendan Eich: Inventor of JavaScript * Dan Ingalls: Smalltalk implementor and designer * Simon Peyton Jones: Coinventor of Haskell * Guy Steele: Coinventor of Scheme Is out of any doubt that their minds have something special and unreachable, and i'm not crazy to think i will ever able to create a new language; i'm just interested in this topic. So, imagine a funny\grotesque scenario where your crazy boss one day will come to your desk to say "i want a new programming language with my name on it..take the time you need and do it", what will you start to study? What kind of knowledge do you need to model, design and implement a brand new programming language?

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  • NullPointerException when installing the Android SDK on Mac OS X

    - by Feanor
    I'm installing the Android SDK on Mac OS X. Following the instructions on the Android Development site, I've downloaded the SDK and modified my .bash_profile to include the path. The next step is to use the Android SDK and AVD Manager to actually download the platforms. However, when I use the Manager to install the platforms, I get the following error in the Terminal. I've looked around for similar problems in the Eclipse and Android forums and haven't found anything yet. Is something else damaged in the environment and needs to be repaired? Any recommendations on where I should look? java.lang.NullPointerException at org.eclipse.swt.graphics.Device.getFontList(Unknown Source) at org.eclipse.jface.resource.FontRegistry.filterData(FontRegistry.java:456) at org.eclipse.jface.resource.FontRegistry.createFont(FontRegistry.java:490) at org.eclipse.jface.resource.FontRegistry.defaultFontRecord(FontRegistry.java:551) at org.eclipse.jface.resource.FontRegistry.defaultFontData(FontRegistry.java:563) at org.eclipse.jface.resource.FontRegistry.getFontData(FontRegistry.java:579) at org.eclipse.jface.dialogs.Dialog.dialogFontIsDefault(Dialog.java:1077) at org.eclipse.jface.dialogs.Dialog.applyDialogFont(Dialog.java:998) at org.eclipse.jface.dialogs.Dialog.createContents(Dialog.java:756) at org.eclipse.jface.window.Window.create(Window.java:431) at org.eclipse.jface.dialogs.Dialog.create(Dialog.java:1089) at com.android.sdkuilib.internal.repository.UpdateChooserDialog.create(UpdateChooserDialog.java:280) at org.eclipse.jface.window.Window.open(Window.java:790) at com.android.sdkuilib.internal.repository.UpdaterData.updateOrInstallAll(UpdaterData.java:502) at com.android.sdkuilib.internal.repository.RemotePackagesPage.onInstallSelectedArchives(RemotePackagesPage.java:323) at com.android.sdkuilib.internal.repository.RemotePackagesPage.access$600(RemotePackagesPage.java:54) at com.android.sdkuilib.internal.repository.RemotePackagesPage$7.widgetSelected(RemotePackagesPage.java:168) at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source) at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source) at org.eclipse.swt.widgets.Display.sendEvent(Unknown Source) at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source) at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source) at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source) at org.eclipse.swt.widgets.Widget.notifyListeners(Unknown Source) at org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source) at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source) at com.android.sdkuilib.internal.repository.UpdaterWindowImpl.open(UpdaterWindowImpl.java:104) at com.android.sdkuilib.repository.UpdaterWindow.open(UpdaterWindow.java:110) at com.android.sdkmanager.Main.showMainWindow(Main.java:281) at com.android.sdkmanager.Main.doAction(Main.java:247) at com.android.sdkmanager.Main.run(Main.java:92) at com.android.sdkmanager.Main.main(Main.java:81) logout

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  • Problems running Java SWT application. Is this something to do with 64 vs 32-bit libraries?

    - by ?????
    I'm getting started with SWT Exception in thread "main" java.lang.UnsatisfiedLinkError: no swt-cocoa-3557 or swt-cocoa in swt.library.path, java.library.path or the jar file at org.eclipse.swt.internal.Library.loadLibrary(Unknown Source) at org.eclipse.swt.internal.Library.loadLibrary(Unknown Source) at org.eclipse.swt.internal.C.<clinit>(Unknown Source) at org.eclipse.swt.internal.cocoa.NSThread.isMainThread(Unknown Source) at org.eclipse.swt.graphics.Device.<init>(Unknown Source) at org.eclipse.swt.widgets.Display.<init>(Unknown Source) at org.eclipse.swt.widgets.Display.<init>(Unknown Source) at org.eclipse.swt.widgets.Display.getDefault(Unknown Source) at com.astrobetty.getotagdesktop.MainUIWindow.main(MainUIWindow.java:110) I've carefully followed the directions here http://www.eclipse.org/swt/eclipse.php I can see libswt-awt-cocoa-3557.jnilib, libswt-cocoa-3557.jnilib, libswt-pi-cocoa-3557.jnilib clearly listed under "Referenced Libraries" in my Eclipse package explorer. Presumably, that should make them available on the classpath when I select the java module that contains "main" and do a "run as" application. What's the problem? I suspect it may be related to 64-bit vs 32-bit VMs....

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  • GPS with J2ME polish

    - by JV
    Hi all, I'm developing an GPS based application with J2ME and J2ME polish(2.1.2), i'm facing problems for accessing the location class. I'm getting the following exception Exception in thread "event-thread" java.lang.UnsatisfiedLinkError: aa.a(I)V Nokia/N95: at aa.a(Native Method) Nokia/N95: at ae.<clinit>(Unknown Source) Nokia/N95: at b.j(Unknown Source) Nokia/N95: at com.allstate.mini.MINIMidlet.commandAction(Unknown Source) Nokia/N95: at ax.b(Unknown Source) Nokia/N95: at u.b(Unknown Source) Nokia/N95: at al.d(Unknown Source) Nokia/N95: at bd.keyReleased(Unknown Source) Nokia/N95: at javax.microedition.lcdui.Display$KeyEvent.run(Display.java:158) Nokia/N95: at org.microemu.device.ui.EventDispatcher.post(EventDispatcher.java:144) Nokia/N95: at org.microemu.device.ui.EventDispatcher.run(EventDispatcher.java:74) Nokia/N95: at java.lang.Thread.run(Unknown Source) Please help...

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  • Error premature end of file pops up when accessing a URL

    - by kayteen
    Hi, I am using Coldfsuion 8.0.1 and Solaris 10 and when i try to run this URL, http://IPADDRESS/flex2gateway/http I am receiving an error message "Premature end of file". Please help me out if i am missing any installation/fix. Error details: [Flex] Premature end of file. flex.messaging.MessageException: Premature end of file. at flex.messaging.io.amfx.AmfxMessageDeserializer.fatalError(AmfxMessageDeserializer.java:249) at org.apache.xerces.util.ErrorHandlerWrapper.fatalError(Unknown Source) at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source) at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source) at org.apache.xerces.impl.XMLVersionDetector.determineDocVersion(Unknown Source) at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) at org.apache.xerces.parsers.XMLParser.parse(Unknown Source) at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source) at javax.xml.parsers.SAXParser.parse(SAXParser.java:395) at javax.xml.parsers.SAXParser.parse(SAXParser.java:198) at flex.messaging.io.amfx.AmfxMessageDeserializer.parse(AmfxMessageDeserializer.java:103) at flex.messaging.io.amfx.AmfxMessageDeserializer.readMessage(AmfxMessageDeserializer.java:90) at flex.messaging.endpoints.amf.SerializationFilter.invoke(SerializationFilter.java:113)

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  • What is a good programming language for beginners? [closed]

    - by user122401
    Possible Duplicates: Best ways to teach a beginner to program? What is the easiest language to start with? What is a good programming language for beginners? I am 15 and had learned C++ before never got into it though? But is this like learning a new language? like having to do it over and over and every day having new stuff to learn ?

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  • Java 7u4 webstart security exception: Class does not match trust level

    - by Glstunna
    We began to notice that with Java 7 (particularly with update 4), that all our users began to see this with our Webstart app: [14:42:58,422] AWT-EventQueue-0(DEBUG) java.lang.SecurityException: class "CLASSNAME" does not match trust level of other classes in the same package [14:42:58,422] AWT-EventQueue-0(DEBUG) at com.sun.deploy.security.CPCallbackHandler$ChildElement.checkResource(Unknown Source) [14:42:58,422] AWT-EventQueue-0(DEBUG) at com.sun.deploy.security.DeployURLClassPath$JarLoader.checkResource(Unknown Source) [14:42:58,422] AWT-EventQueue-0(DEBUG) at com.sun.deploy.security.DeployURLClassPath$JarLoader.getResource(Unknown Source) [14:42:58,422] AWT-EventQueue-0(DEBUG) at com.sun.deploy.security.DeployURLClassPath.getResource(Unknown Source) [14:42:58,422] AWT-EventQueue-0(DEBUG) at java.net.URLClassLoader$1.run(Unknown Source) [14:42:58,422] AWT-EventQueue-0(DEBUG) at java.net.URLClassLoader$1.run(Unknown Source) [14:42:58,422] AWT-EventQueue-0(DEBUG) at java.security.AccessController.doPrivileged(Native Method) [14:42:58,422] AWT-EventQueue-0(DEBUG) at java.net.URLClassLoader.findClass(Unknown Source) [14:42:58,422] AWT-EventQueue-0(DEBUG) at com.sun.jnlp.JNLPClassLoader.findClass(Unknown Source) [14:42:58,422] AWT-EventQueue-0(DEBUG) at java.lang.ClassLoader.loadClass(Unknown Source) [14:42:58,422] AWT-EventQueue-0(DEBUG) at java.lang.ClassLoader.loadClass(Unknown Source)...More Where CLASSNAME = pretty much every class at random points from several jars in the app execution, breaking several behavior. If our users were to use Java 6, they have no problems! Just 7 (update 4). We sign ALL our jars, both the main application jar and it's library jars. i.e Users launching our webstart app see the blue shield instead of yellow or red. This is obviously an issue as users are more frequently now upgrading to Java 7. I have tried to force our app to use Java 6 on the user machine either by using a previous installation(works), or installing a new one....with the j2se version="1.6" tag around resources but this causes it's own problems that would probably be best to make into it's own thread (the auto-jre-installation part). Did Oracle break Webstart security with Java 7u4? How do I solve this securityexception issue?

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  • If you have an application localized in pt-br and pt-pt, what language you should choose if the syst

    - by Sorin Sbarnea
    If you have an application localized in pt-br and pt-pt, what language you should choose if the system is reporting only pt code (generic Portuguese)? This question is independent of the nature of the application, desktop, mobile or browser based. Let's assume you are not able to get region information from another source and you have to choose one language as the default one. The question does apply as well for more case including: * pt-pt and pt-br * en-us and en-gb * fr-fr and fr-CA * zh-cn, zh-tw, .... - in fact in this case I know that zh can be used as predominant language for Simplified Chinese where full code is zh-hans. For zh-tw, zh-hant-tw, zh-hk, zh-mo the proper code (canonical) should be zh-hant. In fact the question can be extended to: How to I determine the predominant languages for a specified meta-language? I need a solution that will include at least Portuguese, English and French.

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  • Is it possible to make notepad++ support tamil language functionality?

    - by Pandiya Chendur
    Notepad++ (from v2.3) supports the multilanguage functionality by means of a translated xml file (from english.xml). Normally you don't need it if you install Notepad++ by its installer. You may need the language file if you install Notepad++ from zip format binary (or if your language is not supported by NSIS installer). Is it possible to make notepad++ support tamil language functionality?

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  • RMI java doesn't create skeleton class

    - by pavithra
    I wrote a remote service MyremoteImpl.java and used following command after compiled it. rmic MyRemoteImpl I learned that this method suppose to create stub class and a skeleton class but I can only see the stub class, why is that? The other problem I faced after run rmiregistry I started the service but it gives following error, I doubt I get this error as I'm missing skeleton class? java.net.MalformedURLException: invalid URL String: Remote Hello at java.rmi.Naming.parseURL(Unknown Source) at java.rmi.Naming.rebind(Unknown Source) at RMIservice.MyRemoteImpl.main(MyRemoteImpl.java:22) Caused by: java.net.URISyntaxException: Illegal character in path at index 6: Remote Hello at java.net.URI$Parser.fail(Unknown Source) at java.net.URI$Parser.checkChars(Unknown Source) at java.net.URI$Parser.parseHierarchical(Unknown Source) at java.net.URI$Parser.parse(Unknown Source) at java.net.URI.<init>(Unknown Source) at java.rmi.Naming.intParseURL(Unknown Source) ... 3 more Please help me to solve this, Thanx in advance!!!

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  • What is the current status of LOGO? (The programming language)

    - by Workshop Alex
    In another Q I saw someone mention LOGO and it reminded me of some programming language from the past, mostly used for educational purposes. Basically, you would have to program a turtle with a pen through it's back. By telling it where to move, the pen would draw lines. It could also lift the pen to move without drawing lines. I have fond memories of this language, since it was one of the first I've ever used, about 30 years ago. (Yeah, I'm old.) Well, I only programmed with LOGO for two days or so, but it got me hooked to programming. But I wonder if the LOGO information on it's Wikipedia page is still correct. And more importantly, are there versions that will create .NET binaries? Are there only LOGO Interpreters and no compilers? What is the current status of this educational language? And more interestingly, are there more experts here at SO who have experimented with LOGO in the past? Yeah, I know. Nowadays this language is a bit antique but I got some warm and comfortable memories when I remembered this interesting language from my history. For a teenager back then, it was fun!

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  • What is a good programming language for testers who are not great programmers?

    - by Brian T Hannan
    We would like to create some simple automated tests that will be created and maintained by testers. Right now we have a tester who can code in any language, but in the future we might want any tester with a limited knowledge of programming to be able to add or modify the tests. What is a good programming language for testers who are not great programmers, or programmers at all? Someone suggested LUA, but I looked into LUA and it might be more complicated that another language would be. Preferably, the language will be interpreted and not be compiled. Let me know what you think.

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  • How to learn a language that has very little coverage?

    - by bennybdbc
    I recently came across the Kogut language, and was interested by it. However, the only website to gain information from is the sourceforge page that hosts the project. I had no idea how to even attempt to look at the language in more depth. So what I'm asking is, has anyone here learnt a language that doesn't have the thousands of resources that Ruby, Python etc. have? What would be the best method to do so?

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  • No Buffer Space available(maximum connection reached?) Form Postgres EDB Driver

    - by Listening.Platform
    We are facing an exception while connecting to database through our java application. The stack trace is as follows com.edb.util.PSQLException: The connection attempt failed. at com.edb.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:189) at com.edb.core.ConnectionFactory.openConnection(ConnectionFactory.java:64) at com.edb.jdbc2.AbstractJdbc2Connection.<init>(AbstractJdbc2Connection.java:161) at com.edb.jdbc3.AbstractJdbc3Connection.<init>(AbstractJdbc3Connection.java:30) at com.edb.jdbc3.Jdbc3Connection.<init>(Jdbc3Connection.java:24) at com.edb.Driver.makeConnection(Driver.java:391) at com.edb.Driver.connect(Driver.java:266) at java.sql.DriverManager.getConnection(Unknown Source) at java.sql.DriverManager.getConnection(Unknown Source) ... 12 more Caused by: java.net.SocketException: No buffer space available (maximum connections reached?): connect at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.PlainSocketImpl.doConnect(Unknown Source) at java.net.PlainSocketImpl.connectToAddress(Unknown Source) at java.net.PlainSocketImpl.connect(Unknown Source) at java.net.SocksSocketImpl.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at java.net.Socket.<init>(Unknown Source) at java.net.Socket.<init>(Unknown Source) at com.edb.core.PGStream.<init>(PGStream.java:70) at com.edb.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:115) ... 20 more When the error occured we were not able to connect to internet and DB and had to reboot the system. But the error occured again after 3 days at same code i.e while connecting to DB. We checked TCP connections using netstat. But there were not many TCP connections i.e it has not reached the max limit. Our application has multiple long running Java processes that pools the DB connections (not more than 60) and keeps it alive for firing the next query (as it has to poll the DB every 2 seconds). Some of the queries in our application are joining large tables (10 million records) to get the related data. We are using following System and applications Windows 2003 server SP2 Java 1.6 Postgres Plus Advanced server 8.4 Database edb-jdbc14.jar driver for connection DB from Java We have used the default configuration of Postgres DB except increasing the connection to 120 from 100. Has anybody encountred the same error with postgres edb driver? Can anybody help us finding the solution?

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  • Why do programmers sometimes refer to "C++/STL" like it's a separate language?

    - by BillyONeal
    This may seem a trivial question, but it's one that's bothered me a lot lately. Why do some programmers refer to "C++/STL" like it's a different language? The STL is part of the C++ standard library -- and therefore is part of the language, "C++". It's not a separate component, and it does not live alone in the scope of things C++. Yet some continually act like it's a different language altogether. Why?

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  • Possibility of language data type not mapped to shipped .NET Framework?

    - by John K
    Does anybody know of a managed programming language implemented on .NET that contains a specialized data type that is not mapped through to the Common Type System/FCL/BCL or one that does not have a shipped .NET equivalent (e.g. shipped standard types like System.String, System.Int32)? This question would likely come from the perspective of someone porting a compiler (although I'm not doing that). Is it as simple as the language creating a new data type outside the BCL/FCL for its specialized type? If so does this hinder interoperability between programming languages that are otherwise accustomed to mapping all their built-in data types to what's in the BCL/FCL, like Visual Basic and C#? I can imagine this situation might come about if an obscure language compiler of some kind is ported to .NET for which there is no direct mapping of one of its implicit data types to the shipped Framework. How is this situation supported or allowed in general? What would be the expectation of the compiler and the Common Language Runtime?

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  • How do you get the language from a session in Joomla?

    - by Moak
    I have some code that sets the lang var to the site default language. $lg = &JFactory::getLanguage(); $lg = explode('-',$lg->_default); $dlg = $lg[0]; if(!JRequest::getWord('lang', false )) JRequest::setVar('lang', $dlg ); however before setting it to $dlg I would like to find out if the language is stored in the user information or session. Can someone tell me how to check the session for language information?

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  • iphone doesn't refresh the localized icon after you change language setting !

    - by tony
    Hi, I manage to localized app icon and app name for different languages.I found the icon changes depending on the language setting on the iphone only when the first time when you install the app from xcode. after that, if i change the language setting, the app icon stay the same but only the app name changes to the localized one. Anyone has an idea is there is way of solving the problem? it seems iphone doens't refresh the icon after you change the language setting. Tony

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  • A programming language for teaching data structures and algorithms with? [closed]

    - by Andreas Grech
    Possible Duplicate: Choice of programming language for learning data structures and algorithms Teachers have different opinions on what programming language they would choose to teach data structures and algorithms with. Some would prefer a lower level language such as C because it allows the student to learn more about what goes on beyond the abstractions in terms of memory allocation and deallocation and pointers and pointer arithmetic. On the other hand, others would say that they would prefer a higher level language like Java because it allows the student to learn more about the concepts of the structures and the algorithm design rather than 'waste time' and fiddle around with memory segmentation faults and all the blunders that come with languages where memory management is manual. What is your take on this issue? And also, please post any references you may know of that also discuss this argument.

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  • The most expressive web app programming language/framework combination?

    - by Thor
    When concerned about creating web applications, I often ask myself how I can make the code easy to read and above all; how to make it easy to maintain. There has been alot of inventions in the last couple of years with probably millions of programmers sharing these thoughts. So, lets test if we can squeeze the distilled knowledge of millions of StackOverflow users for this ultimate answer: Which language/framework combination in the world right now is the most expressive to do common tasks? Please provide a simple example of simplicity, add a link to more information about the language, and no more than one entry per language/framework combination. Specifications: "Web application" in this context refers to applications that runs on a server and outputs HTML/Javascript/CSS for rendering on a client browser. Any server operating system is ok. "Language/Framework combination" can for example be like Java+Struts or Java+SpringWeb or Perl+CGI or Java+ZK "Most expressive" in this context is meant to be minimal code to do common tasks. "Common tasks" include simple output/input, i.e. form specifying, displaying and processing, as well as simply styling of output. I am more concerned about minimality than about complete functionality. A decent language design can have great potential even though it is not complete.

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  • Why might someone say R is *NOT* a programming language? [closed]

    - by Tal Galili
    I came by the following comment today on twitter "R is not a programming language, it's a statistics package with the GUI missing." And I am wondering - Why not? What is "missing" in R to make it a "programming language" ? Update: For the protocol, I am a big fan of R, use it daily, and support it's existence. I now changed the name of this thread from "Why is R NOT a programming language?" to "Why might someone say R is NOT a programming language?" Which better reflects my motivation for this thread (which is, to know if R has any programmatical disadvantages that I might have not heard about).

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  • What can cause the language bar to disappear in a win32 application?

    - by user4484
    When I run my Win32 application the Windows language bar (which is visible in all other applications) disappears after about 5 seconds. It reappears if I quit my application or alt-tab to a different application. If I alt-tab back into my application, it disappears again after five seconds. The switch key doesn't work either. It seems as if the system somehow has concluded that my application doesn't "support" the language bar. Is there something I need to do to for the language bar to be enabled? Or something I shouldn't be doing that can cause it to disappear? The application has a single custom window (where I draw DirectX graphics). I've looked through the arguments to CreateWindow and RegisterClass as well as the window messages that I handle (instead of passing to DefWindowProc) but nothing seems to be directly related to the language bar. I've only tested this on Windows 7.

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