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  • javaEE javax.xml.bind.MarshalException

    - by sandeep
    Hi, I am getting javax.xml.bind.MarshalException error. I am sending List from my webservice to the backingbean and I have this error. Here is my code: Errors WARNING: invocation error on ejb endpoint Login_webservice at /Login_webserviceService/Login_webservice : javax.xml.bind.MarshalException - with linked exception: [javax.xml.bind.JAXBException: class JPA.Cantable nor any of its super class is known to this context.] javax.xml.ws.WebServiceException: javax.xml.bind.MarshalException - with linked exception: [javax.xml.bind.JAXBException: class JPA.Cantable nor any of its super class is known to this context.] at com.sun.xml.ws.message.jaxb.JAXBMessage.writePayloadTo(JAXBMessage.java:325) at com.sun.xml.ws.message.AbstractMessageImpl.writeTo(AbstractMessageImpl.java:142) at com.sun.xml.ws.encoding.StreamSOAPCodec.encode(StreamSOAPCodec.java:109) at com.sun.xml.ws.encoding.SOAPBindingCodec.encode(SOAPBindingCodec.java:278) at com.sun.xml.ws.transport.http.HttpAdapter.encodePacket(HttpAdapter.java:380) at com.sun.xml.ws.transport.http.HttpAdapter.access$100(HttpAdapter.java:92) at com.sun.xml.ws.transport.http.HttpAdapter$HttpToolkit.handle(HttpAdapter.java:525) at com.sun.xml.ws.transport.http.HttpAdapter.handle(HttpAdapter.java:285) at com.sun.xml.ws.transport.http.servlet.ServletAdapter.handle(ServletAdapter.java:143) at org.glassfish.webservices.Ejb3MessageDispatcher.handlePost(Ejb3MessageDispatcher.java:116) at org.glassfish.webservices.Ejb3MessageDispatcher.invoke(Ejb3MessageDispatcher.java:87) at org.glassfish.webservices.EjbWebServiceServlet.dispatchToEjbEndpoint(EjbWebServiceServlet.java:196) at org.glassfish.webservices.EjbWebServiceServlet.service(EjbWebServiceServlet.java:127) at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) Backing bean @WebServiceRef(wsdlLocation = "http://localhost:26565/Login_webserviceService/Login_webservice?WSDL") public String login() { System.out.println("Login Phase entered"); int result = 0; List list; List finalList = null; try { Weblogin.LoginWebserviceService service = new Weblogin.LoginWebserviceService(); Weblogin.LoginWebservice port = service.getLoginWebservicePort(); result = port.login(voterID, password); Weblogin.LoginWebservice port1 = service.getLoginWebservicePort(); list = port1.candDetails(1); finalList = list; this.setList(finalList); } catch (Exception e) { e.printStackTrace(); } if (result == 1) return "polling"; else return "login"; } Webservice public List candDetails(int pollEvent) { List resultList = null; List finalList = null; try { if (pollEvent == 1) { resultList = em.createNamedQuery("Cantable.findAll").getResultList(); finalList = resultList; } } catch (Exception e) { e.printStackTrace(); } return resultList; }

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  • junit mock objects

    - by Codenotguru
    i am new to junit so any help is appreciated. I have a class called sysconfig.java for which i have written a junit class file called TestSysconfig.java that tests some methods in the sysconfig.java. The method that i am testing in sysconfig.java calls another class file "ethipmapping.java" i have created a mock of this class file as Testethipmapping.java. so my question is how do i tell sysconfig.java to call this mock object?

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  • Blogger GData NullPointerException on every second try on Android

    - by Vinay
    I am experiencing a strange phenomenon with Blogger GData API 2.0 on Android. I am using the BloggerService to retrieve blogs. First time it works fine. However EVERY SECOND TRY I get a NullPointerException: Caused by: java.lang.NullPointerException at com.google.gdata.wireformats.AltRegistry.lookupType(AltRegistry.java:190) at com.google.gdata.client.Service.parseResponseData(Service.java:1860) at com.google.gdata.client.Service.getFeed(Service.java:1054) at com.google.gdata.client.Service.getFeed(Service.java:916) at com.google.gdata.client.GoogleService.getFeed(GoogleService.java:631) at com.google.gdata.client.Service.getFeed(Service.java:935)

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  • Why does mobile first responsive design tend to not use max-width queries alongside the min-width queries?

    - by Sam
    First off, I understand the basic principles behind mobile first responsive web design, and totally agree with them. But one thing I don't understand: In my experience, not all styles for small screens can be used for the larger version of a website. For example, usually smaller versions tend to have larger clickable areas, hamburger navigation, etc. So I sometimes have to override these specific styles, aside from just progressively enhancing the base styles. So I was wondering: why is max-width rarely mentioned (or used) in the context of mobile-first responsive web design? Because it looks like it could be used to isolate styles for smaller screens that are not useful for larger screens, and would thus prevent unnecessary duplication of code. A quote which mentions min-width as typically mobile-first, but not max-width: Mobile first, from a coding perspective, means that your base style is typically a single-column, fully-fluid layout. You use @media (min-width: whatever) to add a grid-based layout on top of that. from: http://gomakethings.com/mobile-first-and-internet-explorer/ EDIT: So to be more specific: I was wondering if there is a reason to exclude max-width from a mobile-first responsive design (as it seems like it can be useful for writing your css as DRY as possible, as some styles for small screens will not be used for bigger screens).

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  • WSDLException : An error occurred trying to resolve schema referenced at ...

    - by Stefano
    Hello i'm trying to generate a proxy class from a local wsdl file with eclipse Galileo and axis 2 1.4 on windows xp . My problem is that i get an error due to an imported schema inside the wsdl . The line tha troubles me is : <xsd:import namespace="http://www.w3.org/2005/05/xmlmime" schemaLocation="http://www.w3.org/2005/05/xmlmime"/> i've tried to run the wsdl2java following command: wsdl2java.bat -uri SOAService.wsdl -o D:\temp p test -d xmlbeans -a -s -ns2p -uw and i get the following exception : Exception in thread "main" org.apache.axis2.wsdl.codegen.CodeGenerationException : Error parsing WSDL at org.apache.axis2.wsdl.codegen.CodeGenerationEngine.(CodeGenerat ionEngine.java:156) at org.apache.axis2.wsdl.WSDL2Code.main(WSDL2Code.java:35) at org.apache.axis2.wsdl.WSDL2Java.main(WSDL2Java.java:24) Caused by: javax.wsdl.WSDLException: WSDLException (at /wsdl:definitions/wsdl:ty pes/xsd:schema): faultCode=OTHER_ERROR: An error occurred trying to resolve sche ma referenced at 'http://www.w3.org/2005/05/xmlmime', relative to 'file:/D:/Prog rammi/axis2-1.4/bin/SOAService.wsdl'.: java.net.ConnectException: Connection tim ed out: connect at com.ibm.wsdl.xml.WSDLReaderImpl.parseSchema(Unknown Source) at com.ibm.wsdl.xml.WSDLReaderImpl.parseSchema(Unknown Source) at com.ibm.wsdl.xml.WSDLReaderImpl.parseTypes(Unknown Source) at com.ibm.wsdl.xml.WSDLReaderImpl.parseDefinitions(Unknown Source) at com.ibm.wsdl.xml.WSDLReaderImpl.readWSDL(Unknown Source) at com.ibm.wsdl.xml.WSDLReaderImpl.readWSDL(Unknown Source) at com.ibm.wsdl.xml.WSDLReaderImpl.readWSDL(Unknown Source) at com.ibm.wsdl.xml.WSDLReaderImpl.readWSDL(Unknown Source) at com.ibm.wsdl.xml.WSDLReaderImpl.readWSDL(Unknown Source) at org.apache.axis2.wsdl.codegen.CodeGenerationEngine.readInTheWSDLFile( CodeGenerationEngine.java:288) at org.apache.axis2.wsdl.codegen.CodeGenerationEngine.(CodeGenerat ionEngine.java:111) ... 2 more Caused by: java.net.ConnectException: Connection timed out: connect at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333) at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195) at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182) at java.net.Socket.connect(Socket.java:520) at java.net.Socket.connect(Socket.java:470) at sun.net.NetworkClient.doConnect(NetworkClient.java:157) at sun.net.www.http.HttpClient.openServer(HttpClient.java:388) at sun.net.www.http.HttpClient.openServer(HttpClient.java:523) at sun.net.www.http.HttpClient.(HttpClient.java:231) at sun.net.www.http.HttpClient.New(HttpClient.java:304) at sun.net.www.http.HttpClient.New(HttpClient.java:321) at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLC onnection.java:813) at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConne ction.java:765) at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection .java:690) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLCon nection.java:934) at java.net.URL.openStream(URL.java:1007) at com.ibm.wsdl.util.StringUtils.getContentAsInputStream(Unknown Source) i suspect it's due to the system proxy which doesn't let retrieve the xsd to the wsdl2java tool. In fact i can download the file from the browser without problems. There's an option to specify a proxy to wsdl2java or someone has resolved this issue ? For the moment i've downloaded the xsd, added it to the project and changed the wsdl to include the relative file (instead of the remote one) , but i'd prefer to avoid this , because the file is a third party service wsdl. thank you in advance for any hint Stefano

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  • June Oracle Technology Network NEW Member Benefits - books books and more books!!!

    - by Cassandra Clark
    As we mentioned a few posts ago we are working to bring Oracle Technology Network members NEW benefits each month. Listed below are several discounts on technology books brought to you by Apress, Pearson, CRC Press and Packt Publishing. Happy reading!!! Apress Offers - Get 50% off the eBook below using promo code ORACLEJUNEJCCF. Pro ODP.NET for Oracle Database 11g By Edmund T. Zehoo This book is a comprehensive and easy-to-understand guide for using the Oracle Data Provider (ODP) version 11g on the .NET Framework. It also outlines the core GoF (Gang of Four) design patterns and coding techniques employed to build and deploy high-impact mission-critical applications using advanced Oracle database features through the ODP.NET provider. Pearson Offers - Get 35% off all titles listed below using code OTNMEMBER. SOA Design Patterns | Thomas Earl | ISBN: 0136135161 In cooperation with experts and practitioners throughout the SOA community, best-selling author Thomas Erl brings together the de facto catalog of design patterns for SOA and service-orientation. Oracle Performance Survival Guide | Guy Harrison | ISBN: 9780137011957 The fast, complete, start-to-finish guide to optimizing Oracle performance. Core JavaServer Faces, Third Edition | David Geary and Cay S. Horstmann | ISBN: 9780137012893 Provides everything you need to master the powerful and time-saving features of JSF 2.0? Solaris Security Essentials | ISBN: 9780137012336 A superb guide to deploying and managing secure computer environments.? Effective C#, Second Edition | Bill Wagner | ISBN: 9780321658708 Respected .NET expert Bill Wagner identifies fifty ways you can leverage the full power of the C# 4.0 language to express your designs concisely and clearly. CRC Press Offers - Use 813DA to get 20% off this the title below. Secure and Resilient Software Development This book illustrates all phases of the secure software development life cycle. It details quality software development strategies that stress resilience requirements with precise, actionable, and ground-level inputs. Packt Publishing Offers - Use the promo code "Java35June", to save 35% off of each eBook mentioned below. JSF 2.0 Cookbook By Anghel Leonard ISBN: 978-1-847199-52-2 Packed with fast, practical solutions and techniques for JavaServer Faces developers who want to push past the JSF basics. JavaFX 1.2 Application Development Cookbook By Vladimir Vivien ISBN: 978-1-847198-94-5 Fast, practical solutions and techniques for building powerful, responsive Rich Internet Applications in JavaFX.

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  • Dealing with a fundamental design flaw when you're new to the project

    - by Matt Phillips
    I've just started working on an open source project with around 30 developers in it. I'm working on fixing some of the bugs as a way to get into the "loop" and become a regular committer to the project. The problem is I think I've uncovered a fundamental design flaw that's causing one of the bugs I'm working on. But I feel like if I blast this on the mailing list I'm going to come off as arrogant, and some of the discussions I've had about the issue are butting heads with some of the people. How should I go about this?

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  • Design Book–Fourth(last) Section (Physical Abstraction Optimization)

    - by drsql
    In this last section of the book, we will shift focus to the physical abstraction layer optimization. By this I mean the little bits and pieces of the design that is specifically there for performance and are actually part of the relational engine (read: the part of the SQL Server experience that ideally is hidden from you completely, but in 2010 reality it isn’t quite so yet.  This includes all of the data structures like database, files, etc; the optimizer; some coding, etc. In my mind, this...(read more)

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  • Android 2.1 GoogleMaps ItemizedOverlay ConcurrentModificationException

    - by Soumya Simanta
    Hi, I cannot figure out the origin of the ConcurrentModificationException. In my activity I'm calling updateMapOverlay(). I'm also calling updateMapOverlay() inside another Thread (a TimerTask) that is invoked on regular intervals. I'm taking the appropriate locks when invoking updateMapOverlay() from both the threads. Is this problem being caused because I'm invoking updateMapOverlay from inside a non-UI thread (i.e., TimerTask). Has anyone else faced a similar issue ? private void updateMapOverlay() { this.itemizedOverlay.refreshItems(createOverlayItemsList()); List<Overlay> overlays = mapView.getOverlays(); overlays.clear(); overlays.add(cotItemizedOverlay); this.mapview.invalidate(); } Thanks. Exception: W/dalvikvm(10641): threadid=3: thread exiting with uncaught exception (group=0x4001b180) E/AndroidRuntime(10641): Uncaught handler: thread main exiting due to uncaught exception E/AndroidRuntime(10641): java.util.ConcurrentModificationException E/AndroidRuntime(10641): at java.util.AbstractList$SimpleListIterator.next(AbstractList.java:64) E/AndroidRuntime(10641): at com.google.android.maps.OverlayBundle.draw(OverlayBundle.java:41) E/AndroidRuntime(10641): at com.google.android.maps.MapView.onDraw(MapView.java:494) E/AndroidRuntime(10641): at android.view.View.draw(View.java:6535) E/AndroidRuntime(10641): at android.view.ViewGroup.drawChild(ViewGroup.java:1531) E/AndroidRuntime(10641): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258) E/AndroidRuntime(10641): at android.view.ViewGroup.drawChild(ViewGroup.java:1529) E/AndroidRuntime(10641): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258) E/AndroidRuntime(10641): at android.view.View.draw(View.java:6538) E/AndroidRuntime(10641): at android.widget.FrameLayout.draw(FrameLayout.java:352) E/AndroidRuntime(10641): at android.view.ViewGroup.drawChild(ViewGroup.java:1531) E/AndroidRuntime(10641): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258) E/AndroidRuntime(10641): at android.view.ViewGroup.drawChild(ViewGroup.java:1529) E/AndroidRuntime(10641): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258) E/AndroidRuntime(10641): at android.view.View.draw(View.java:6538) E/AndroidRuntime(10641): at android.widget.FrameLayout.draw(FrameLayout.java:352) E/AndroidRuntime(10641): at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1830) E/AndroidRuntime(10641): at android.view.ViewRoot.draw(ViewRoot.java:1349) E/AndroidRuntime(10641): at android.view.ViewRoot.performTraversals(ViewRoot.java:1114) E/AndroidRuntime(10641): at android.view.ViewRoot.handleMessage(ViewRoot.java:1633) E/AndroidRuntime(10641): at android.os.Handler.dispatchMessage(Handler.java:99) E/AndroidRuntime(10641): at android.os.Looper.loop(Looper.java:123) E/AndroidRuntime(10641): at android.app.ActivityThread.main(ActivityThread.java:4363) E/AndroidRuntime(10641): at java.lang.reflect.Method.invokeNative(Native Method) E/AndroidRuntime(10641): at java.lang.reflect.Method.invoke(Method.java:521) E/AndroidRuntime(10641): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) E/AndroidRuntime(10641): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) E/AndroidRuntime(10641): at dalvik.system.NativeStart.main(Native Method) I/Process ( 95): Sending signal. PID: 10641 SIG: 3

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  • Problem installing the latest eclipse IDE

    - by James
    I'm running ubuntu 11.04. I'm trying to install the latest "eclipse for java developers" IDE (version Indigo 3.7.1). I have downloaded and extracted it. I attempt to run it by changing to the extracted folder and executing ./eclipse This produces the following errors in the terminal: /usr/lib/gio/modules/libgiobamf.so: wrong ELF class: ELFCLASS64 Failed to load module: /usr/lib/gio/modules/libgiobamf.so /usr/lib/gio/modules/libgvfsdbus.so: wrong ELF class: ELFCLASS64 Failed to load module: /usr/lib/gio/modules/libgvfsdbus.so And then a dialog opens with this error message: JVM terminated. Exit code=13 /usr/bin/java -Dosgi.requiredJavaVersion=1.5 -XX:MaxPermSize=256m -Xms40m -Xmx384m -jar /opt/eclipse//plugins/org.eclipse.equinox.launcher_1.2.0.v20110502.jar -os linux -ws gtk -arch x86 -showsplash -launcher /opt/eclipse/eclipse -name Eclipse --launcher.library /opt/eclipse//plugins/org.eclipse.equinox.launcher.gtk.linux.x86_1.1.100.v20110505/eclipse_1407.so -startup /opt/eclipse//plugins/org.eclipse.equinox.launcher_1.2.0.v20110502.jar --launcher.overrideVmargs -exitdata 2f80031 -product org.eclipse.epp.package.java.product -clean -vm /usr/bin/java -vmargs -Dosgi.requiredJavaVersion=1.5 -XX:MaxPermSize=256m -Xms40m -Xmx384m -jar /opt/eclipse//plugins/org.eclipse.equinox.launcher_1.2.0.v20110502.jar I'd appreciate any help / insight. Update I should mention that I'm running 32 bit ubuntu and I'm trying to install 32 bit eclipse. Update #2 Oops - I just realized that I'm running 64 bit ubuntu, not 32 bit ubuntu.

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  • Human vs human android chess game design

    - by Plejo
    First of all I am total amateur in game development and sorry for my poor English. I want to make android human vs human chess game. So I am wondering how to design it? scenario 1: User connect to server, find opponent and send moves to server using socket, so match is running on a server side. I think this is not good idea because move should be validated on client side - or do I have to validate moves on client side? I do not think this is good solution because game is seperated. scenario 2: Using hole punching technique so server is needed only for connection between players, so game is running on android devices. which approach do you suggest? Or is there any better solution? Which server is best to use?

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  • choosing Database and Its Design for Rails

    - by Gaurav Shah
    I am having a difficulty in deciding the database & its structure. Let us say the problem is like this. For my product I have various customers( each is an educational institute) Each customer have their own sub-clients ( Institution have students) Each student record will have some basic information like "name" & "Number" . There are also additional information that a customer(institution) might want to ask sub-client(student) like "email" or "semester" I have come up with two solutions : 1. Mysql _insititution__ id-|- Description| __Student__ id-|-instituition_id-|-Name-|-Number| __student_additional_details__ student_id -|- field_name -|- Value Student_additional_details will have multiple records for each student depending upon number of questions asked from institution. 2.MongoDb _insititution___ id-|- Description| _Student__ id-|-instituition_id-|-Name-|-Number|-otherfield1 -|- otherfield2 with mongo the structure itself can be dynamic so student table seems really good in mongo . But the problem comes when I have to relate student with institution . So which one is a better design ? Or some other idea ?

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  • PASS Conference 2011 Topic: Multitenant Design and Sharding with SQL Azure

    - by Herve Roggero
    I am really happy to announce that I have been accepted as a speaker at the 2011 PASS Conference in Seattle. The topic? It will be about SQL Azure scalability using shards, and the Data Federation feature of SQL Azure. I will also talk extensively about the community open-source sharding library Enzo SQL Shard (enzosqlshard.codeplex.com) and show how to make the most out of it. In general, the presentation will provide details about how to properly design an application for sharding, how to make it work for SQL Server, SQL Azure, and how to leverage the upcoming Data Federation technology that Microsoft is planning. The primary objective is to turn sharding an implementation concern, not a development concern. Using a library like Enzo SQL Shard will help you achieve this objective. If you come to PASS Summit this year, come see me and mention you saw this blog!

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  • JavaOne Latin America Schedule Changes For Thursday

    - by Tori Wieldt
    tweetmeme_url = 'http://blogs.oracle.com/javaone/2010/12/javaone_latin_america_schedule_changes_for_thursday.html'; Share .FBConnectButton_Small{background-position:-5px -232px !important;border-left:1px solid #1A356E;} .FBConnectButton_Text{margin-left:12px !important ;padding:2px 3px 3px !important;} The good news: we've got LOTS of developers at JavaOne Latin America.The bad news: the rooms are too small to hold everyone! (we've heard you)The good news: selected sessions for Thursday have been moved larger rooms (the keynote halls) More good news: some sessions that were full from Wednesday will be repeated on Thursday. SCHEDULE CHANGES FOR THURSDAY, DECEMBER 9THNote: Be sure to check the schedule on site, there still may be some last minute changes. Session Name Speaker New Time/Room Ginga, LWUIT, JavaDTV and You 2.0 Dimas Oliveria Thursday, December 9, 11:15am - 12:00pm Auditorio 4 JavaFX do seu jeito: criando aplicativos JavaFX com linguagens alternativas Stephen Chin Thursday, December 9, 3:00pm - 3:45pm Auditorio 4 Automatizando sua casa usando Java; JavaME, JavaFX, e Open Source Hardware Vinicius Senger Thursday, December 9, 9:00am - 9:45am Auditorio 3 Construindo uma arquitetura RESTful para aplicacoes ricas com HTML 5 e JSF2 Raphael Helmonth Adrien Caetano Thursday, December 9, 5:15pm - 6:00pm Auditorio 2 Dicas eTruquies sobre performance em Java EE JPA e JSF Alberto Lemos e Danival Taffarel Calegari Thursday, December 9, 2:00pm - 2:45pm Auditorio 2 Escrevendo Aplicativos Multipatforma Incriveis Usando LWUIT Roger Brinkley Cancelled Platforma NetBeans: sem slide - apenas codigo Mauricio Leal Cancelled Escalando o seu AJAX Push com Servlet 3.0 Paulo Silveria Keynote Hall 9:00am - 9:45am Cobetura Completa de Ferramentas para a Platforma Java EE 6 Ludovic Champenois Keynote Hall 10:00am - 10:45am Servlet 3.0 - Expansivel, Assincrono e Facil de Usar Arun Gupta Keynote Hall 4:00pm - 4:45pm Transforme seu processo em REST com JAX-RS Guilherme Silveria Keynote Hall 5:00pm - 5:45pm The Future of Java Fabiane Nardon e Bruno Souza Keynote Hall 6:00pm - 6:45pm Thanks for your understanding, we are tuning the conference to make it the best JavaOne possible.

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  • Help Us Pick the First T-Shirt Design to Promote How-To Geek

    - by Eric Z Goodnight
    Here’s your first peek at How-To Geek’s new line of merchandise! Tell us what you think, what you like, and what you actually would like to own in this first round of potential HTG tee shirts. If you like the content here at HTG, we’d love to hear back from you—we made these for you, the readers, and we hope to hear what suits you and if you like what we’ve got to offer. Check them out, tell us your thoughts in the comments section (or send us emails at [email protected]) and fill out our poll in the section below.  The design that you like the most will be professionally printed and sold right here at howtogeek.com. Interested in buying one of them right now? Jump to the bottom to be notified when they’re ready for be bought and shipped right to you. How to Own Your Own Website (Even If You Can’t Build One) Pt 3 How to Sync Your Media Across Your Entire House with XBMC How to Own Your Own Website (Even If You Can’t Build One) Pt 2

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  • Code Generation and IDE vs writing per Hand

    - by sytycs
    I have been programming for about a year now. Pretty soon I realized that I need a great Tool for writing code and learned Vim. I was happy with C and Ruby and never liked the idea of an IDE. Which was encouraged by a lot of reading about programming.[1] However I started with (my first) Java Project. In a CS Course we were using Visual Paradigm and encouraged to let the program generate our code from a class diagram. I did not like that Idea because: Our class diagram was buggy. Students more experienced in Java said they would write the code per hand. I had never written any Java before and would not understand a lot of the generated code. So I took a different approach and wrote all methods per Hand (getter and Setter included). My Team-members have written their parts (partly generated by VP) in an IDE and I was "forced" to use it too. I realized they had generated equal amounts of code in a shorter amount of time and did not spend a lot of time setting their CLASSPATH and writing scripts for compiling that son of a b***. Additionally we had to implement a GUI and I dont see how we could have done that in a sane matter in Vim. So here is my Problem: I fell in love with Vim and the Unix way. But it looks like for getting this job done (on time) the IDE/Code generation approach is superior. Do you have equal experiences? Is Java by the nature of the language just more suitable for an IDE/Code generated approach? Or am I lacking the knowledge to produce equal amounts of code "per Hand"? [1] http://heather.cs.ucdavis.edu/~matloff/eclipse.html

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  • How to implement early exit / return in Haskell?

    - by Giorgio
    I am porting a Java application to Haskell. The main method of the Java application follows the pattern: public static void main(String [] args) { if (args.length == 0) { System.out.println("Invalid number of arguments."); System.exit(1); } SomeDataType d = getData(arg[0]); if (!dataOk(d)) { System.out.println("Could not read input data."); System.exit(1); } SomeDataType r = processData(d); if (!resultOk(r)) { System.out.println("Processing failed."); System.exit(1); } ... } So I have different steps and after each step I can either exit with an error code, or continue to the following step. My attempt at porting this to Haskell goes as follows: main :: IO () main = do a <- getArgs if ((length args) == 0) then do putStrLn "Invalid number of arguments." exitWith (ExitFailure 1) else do -- The rest of the main function goes here. With this solution, I will have lots of nested if-then-else (one for each exit point of the original Java code). Is there a more elegant / idiomatic way of implementing this pattern in Haskell? In general, what is a Haskell idiomatic way to implement an early exit / return as used in an imperative language like Java?

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  • In the Cloud, Everything Costs Money

    - by BuckWoody
    I’ve been teaching my daughter about budgeting. I’ve explained that most of the time the money coming in is from only one or two sources – and you can only change that from time to time. The money going out, however, is to many locations, and it changes all the time. She’s made a simple debits and credits spreadsheet, and I’m having her research each part of the budget. Her eyes grow wide when she finds out everything has a cost – the house, gas for the lawnmower, dishes, water for showers, food, electricity to run the fridge, a new fridge when that one breaks, everything has a cost. She asked me “how do you pay for all this?” It’s a sentiment many adults have looking at their own budgets – and one reason that some folks don’t even make a budget. It’s hard to face up to the realities of how much it costs to do what we want to do. When we design a computing solution, it’s interesting to set up a similar budget, because we don’t always consider all of the costs associated with it. I’ve seen design sessions where the new software or servers are considered, but the “sunk” costs of personnel, networking, maintenance, increased storage, new sizes for backups and offsite storage and so on are not added in. They are already on premises, so they are assumed to be paid for already. When you move to a distributed architecture, you'll see more costs directly reflected. Store something, pay for that storage. If the system is deployed and no one is using it, you’re still paying for it. As you watch those costs rise, you might be tempted to think that a distributed architecture costs more than an on-premises one. And you might be right – for some solutions. I’ve worked with a few clients where moving to a distributed architecture doesn’t make financial sense – so we didn’t implement it. I still designed the system in a distributed fashion, however, so that when it does make sense there isn’t much re-architecting to do. In other cases, however, if you consider all of the on-premises costs and compare those accurately to operating a system in the cloud, the distributed system is much cheaper. Again, I never recommend that you take a “here-or-there-only” mentality – I think a hybrid distributed system is usually best – but each solution is different. There simply is no “one size fits all” to architecting a solution. As you design your solution, cost out each element. You might find that using a hybrid approach saves you money in one design and not in another. It’s a brave new world indeed. So yes, in the cloud, everything costs money. But an on-premises solution also costs money – it’s just that “dad” (the company) is paying for it and we don’t always see it. When we go out on our own in the cloud, we need to ensure that we consider all of the costs.

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  • Android: Getting Error: Conversion to Dalvik format failed

    - by Rupesh C
    I am building an app on android and running into an error and while searching on net, came across your posting on this and changed the eclipse.ini to increase Xms and Xmx params but still this error does not go away. I am using Eclipse IDE for Java with Andrioid SDK 2.1 on Mac OS. Please help or please point me to someone who might know. Btw, this error only happens when i add external jar files (which i need for my project). here are the list of external jar files that i have in my classpath.) // httpclient-4.0.1.jar from apache // httpcore -4.0.1.jarfrom apache // commons-codec-1.3.jar from apache //commons-logging-1.1.1.jar from apache // json_simple-1.1.jar from google Here is the complete error: UNEXPECTED TOP-LEVEL EXCEPTION: java.lang.IllegalArgumentException: already added: Lorg/apache/commons/logging/impl/AvalonLogger; [2010-05-02 21:57:05 - MyApp]     at com.android.dx.dex.file.ClassDefsSection.add(ClassDefsSection.java:123) [2010-05-02 21:57:05 - MyApp]     at com.android.dx.dex.file.DexFile.add(DexFile.java:143) [2010-05-02 21:57:05 - MyApp]     at com.android.dx.command.dexer.Main.processClass(Main.java:301) [2010-05-02 21:57:05 - MyApp]     at com.android.dx.command.dexer.Main.processFileBytes(Main.java:278) [2010-05-02 21:57:05 - MyApp]     at com.android.dx.command.dexer.Main.access$100(Main.java:56) [2010-05-02 21:57:05 - MyApp]     at com.android.dx.command.dexer.Main$1.processFileBytes(Main.java:229) [2010-05-02 21:57:05 - MyApp]     at com.android.dx.cf http://com.android.dx.cf.direct.ClassPathOpener.pro .direct.ClassPathOpener.processArchive(ClassPathOpener.java:244) [2010-05-02 21:57:05 - MyApp]     at com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:130) [2010-05-02 21:57:05 - MyApp]     at com.android.dx.cf.direct.ClassPathOpener.process(ClassPathOpener.java:108) [2010-05-02 21:57:05 - MyApp]     at com.android.dx.command.dexer.Main.processOne(Main.java:247) [2010-05-02 21:57:05 - MyApp]     at com.android.dx.command.dexer.Main.processAllFiles(Main.java:183) [2010-05-02 21:57:05 - MyApp]     at com.android.dx.command.dexer.Main.run(Main.java:139) [2010-05-02 21:57:05 - MyApp]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [2010-05-02 21:57:05 - MyApp]     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) [2010-05-02 21:57:05 - MyApp]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [2010-05-02 21:57:05 - MyApp]     at java.lang.reflect.Method.invoke(Method.java:592) [2010-05-02 21:57:05 - MyApp]     at com.android.ide.eclipse.adt.internal.sdk.DexWrapper.run(Unknown Source) [2010-05-02 21:57:05 - MyApp]     at com.android.ide.eclipse.adt.internal.build.ApkBuilder.executeDx(Unknown Source) [2010-05-02 21:57:05 - MyApp]     at com.android.ide.eclipse.adt.internal.build.ApkBuilder.build(Unknown Source) [2010-05-02 21:57:05 - MyApp]     at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:627) [2010-05-02 21:57:05 - MyApp]     at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) [2010-05-02 21:57:05 - MyApp]     at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:170) [2010-05-02 21:57:05 - MyApp]     at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:201) [2010-05-02 21:57:05 - MyApp]     at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:253) [2010-05-02 21:57:05 - MyApp]     at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) [2010-05-02 21:57:05 - MyApp]     at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:256) [2010-05-02 21:57:05 - MyApp]     at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:309) [2010-05-02 21:57:05 - MyApp]     at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:341) [2010-05-02 21:57:05 - MyApp]     at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:140) [2010-05-02 21:57:05 - MyApp]     at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:238) [2010-05-02 21:57:05 - MyApp]     at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55) [2010-05-02 21:57:05 - MyApp] 4 errors; aborting [2010-05-02 21:57:05 - MyApp] Conversion to Dalvik format failed with error 1 Thanks, Rupesh

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  • Can't get Minecraft to run on Ubuntu

    - by Dennis
    I have installed JDK and JRE from this tutorial and have tried many methods of starting it up, yet my results are always the same. If any one could please help me I would be very grateful. Exception in thread "Thread-3" java.lang.UnsatisfiedLinkError: /home/dennis/.minecraft/bin/natives/liblwjgl.so: /home/dennis/.minecraft/bin/natives/liblwjgl.so: wrong ELF class: ELFCLASS32 (Possible cause: architecture word width mismatch) at java.lang.ClassLoader$NativeLibrary.load(Native Method) at java.lang.ClassLoader.loadLibrary1(Unknown Source) at java.lang.ClassLoader.loadLibrary0(Unknown Source) at java.lang.ClassLoader.loadLibrary(Unknown Source) at java.lang.Runtime.load0(Unknown Source) at java.lang.System.load(Unknown Source) at org.lwjgl.Sys$1.run(Sys.java:69) at java.security.AccessController.doPrivileged(Native Method) at org.lwjgl.Sys.doLoadLibrary(Sys.java:65) at org.lwjgl.Sys.loadLibrary(Sys.java:81) at org.lwjgl.Sys.<clinit>(Sys.java:98) at net.minecraft.client.Minecraft.F(SourceFile:1853) at aoe.<init>(SourceFile:20) at net.minecraft.client.Minecraft.<init>(SourceFile:77) at anv.<init>(SourceFile:36) at net.minecraft.client.MinecraftApplet.init(SourceFile:36) at net.minecraft.Launcher.replace(Launcher.java:136) at net.minecraft.Launcher$1.run(Launcher.java:79)

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  • How to design a replay system

    - by daddz
    So how would I design a replay system? You may know it from certain games like Warcraft 3 or Starcraft where you can watch the game again after it has been played already. You end up with a relatively small replay file. So my questions are: How to save the data? (custom format?) (small filesize) What shall be saved? How to make it generic so it can be used in other games to record a time period (and not a complete match for example)? Make it possible to forward and rewind (WC3 couldn't rewind as far as I remember)

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  • Is dynamic casting Entities A good design?

    - by Milo
    For my game, Everything inherits from Entity, then other things like Player, PhysicsObject, etc, inherit from Entity. The physics engine sends collision callbacks which has an Entity* to the B that A collided on. Then, lets say A is a Bullet, A tries to cast the entity as a player, if it succeeds, it reduces the player's health. Is this a good design? The problem I have with a message system is that I'd need messages for everything, like: entity.sendMessage(SET_PLAYER_HEALTH,16); So that's why I think casting is cleaner.

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  • Designing Mobile SMS text advertising system

    - by Ramraj Edagutti
    Currently, I am working on a product where we have an SMS text advertising system, and using this, we setup advertising campaigns for clients, and later these campaigns are sent to the end users. This is very similar to Google Adwords, but targeted to Mobile users via SMS. Just to give an overview of the system Each Campaign is mapped to an advertiser Campaign has start date and end date Campaign has a filter condition(s) or query to select the target user base from our database (to whom we send Campaigns) Target user base can be fixed, for e.g send campaign to 10000 users Target user base can also be dynamic based on query condition, for e.g send campaign to users who are active and from a particular state, district, town etc. (this way user base will be keep changing on daily basis) Campaign can have multiple campaign messages Each campaign message has start date and end date Each campaign message can have multiple message texts for different locales, for e.g English,Hindi,Telugu etc After creating an advertisement campaign, we run daily night job to provision the target user base for that a particular campaign in a separate table, and another daily job runs on morning times and checks provisioned table for campaigns and targeted users and sends the campaign to users via SMS. Problem is, current UI for creating advertising campaigns is designed in a very technical manner, I mean, normal user or business owner or clients can not use the UI to create a campaign. Below are reasons why the UI is very technical in nature Filter condition(s) or query input filed, takes user ids or mobile numbers or SQL queries. Most of times or almost every time, we use big SQL queries So we end up storing SQL queries in a database for a campaign, later we use this SQL query to fetch targeted user base. For scheduling these campaigns, we have input filed on UI which takes quartz cron expression(s) ( for e.g. send campaign on "0 0 9 1-10 MAR 2012" ), again very technical in nature Normal user or business owner, can not use the UI for creating campaigns for reasons mentioned above, Currently, we ourself (developers) helping clients to setup/create campaigns. we are trying to re-design the UI to make it more user friendly so that any user can go to UI and create an advertisement campaign by himself. I am thinking of re-designing the current UI similar to Google Adwords interface, especially for selecting target users based on user geography like country, state, city etc. I also need to select users based user subscription(s), which might make system even more complex. And also, for campaign scheduling, I am thinking of using weekdays with hours. For example, I will shows Monday to Sunday on UI, and user can select the from hours, to hours etc. Any better ideas or suggestion on how to design UI in very user friendly manner and what design should be followed on server side code (we write backend code on java/jpa/spring/quartz)? And I am looking for ideas or design patterns on how to build SQL queries (using JPA/Hinernate) programmatically on server side, based on varies conditions like based on country, state, town, village, and user subscriptions.

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  • hudson.util.ProcessTreeTest test error

    - by senzacionale
    error: Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.011 sec Running hudson.util.ProcessTreeTest Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.181 sec <<< FAILURE! Running hudson.model.LoadStatisticsTest Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 2.089 sec Running hudson.util.ArgumentListBuilderTest Tests run: 5, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.053 sec Running hudson.util.RobustReflectionConverterTest Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.029 sec Running hudson.util.VersionNumberTest Tests run: 3, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.074 sec Running hudson.util.CyclicGraphDetectorTest Tests run: 3, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.038 sec Results : Tests in error: testRemoting(hudson.util.ProcessTreeTest) Tests run: 102, Failures: 0, Errors: 1, Skipped: 0 [INFO] ------------------------------------------------------------------------ [ERROR] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] There are test failures. Please refer to D:\PROJEKTI\Maven\hudson\main\core\target\surefire-reports for the individual test results. [INFO] ------------------------------------------------------------------------ [INFO] For more information, run Maven with the -e switch [INFO] ------------------------------------------------------------------------ [INFO] Total time: 17 minutes 58 seconds [INFO] Finished at: Fri Jun 11 21:04:46 CEST 2010 [INFO] Final Memory: 85M/152M [INFO] ------------------------------------------------------------------------ error log: ------------------------------------------------------------------------------- Test set: hudson.util.ProcessTreeTest ------------------------------------------------------------------------------- Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.181 sec <<< FAILURE! testRemoting(hudson.util.ProcessTreeTest) Time elapsed: 0.169 sec <<< ERROR! org.jvnet.winp.WinpException: Failed to read environment variable table error=299 at .\envvar-cmdline.cpp:114 at org.jvnet.winp.Native.getCmdLineAndEnvVars(Native Method) at org.jvnet.winp.WinProcess.parseCmdLineAndEnvVars(WinProcess.java:114) at org.jvnet.winp.WinProcess.getEnvironmentVariables(WinProcess.java:109) at hudson.util.ProcessTree$Windows$1.getEnvironmentVariables(ProcessTree.java:419) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at hudson.remoting.RemoteInvocationHandler$RPCRequest.perform(RemoteInvocationHandler.java:274) at hudson.remoting.RemoteInvocationHandler$RPCRequest.call(RemoteInvocationHandler.java:255) at hudson.remoting.RemoteInvocationHandler$RPCRequest.call(RemoteInvocationHandler.java:215) at hudson.remoting.UserRequest.perform(UserRequest.java:114) at hudson.remoting.UserRequest.perform(UserRequest.java:48) at hudson.remoting.Request$2.run(Request.java:270) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:619) does anyone have any idea what can be wrong in test? Regards

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  • Transition from maintenance programming to design

    - by andrew wang
    What to do people do develop a design for a s/w for a given set of requirements? I like many people joined a Semiconductor MNC and got stuck in maintenance for quite a couple of years. My work was usually changing a lines of code for windows drivers supplied by my company or a couple of small script (style like) C programs for validating h/w. As a result I developed the bad habit of 'programming by coincidence'. I have not developed the ability for designing tools/programs from scratch. I was the only s/w member of the local team and thus some grunt work from the well established other site of the company came to be done by me. Now I have moved to a different company and thus finding developing from scratch very difficult. How do I unlearn my bad habit and develop this ability of designing s/w and then coding it ?

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