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  • Want to learn/dive into Java Web Development—where to start?

    - by ernesto che
    Hi folks, I want to dive into Java Web Development, but I don’t know where to start because I am overwhelmed with Frameworks, JSRs, modules and the like. Coming from a PHP and Ruby (on Rails) background, it may seem awkward to go the other way ’round—still there are a lot of places where Java is (and probably will be) prevalent. I know basic Java concepts, syntax and OOP, and I have done (too much) nonsense in existing projects in JSP. I am already using SVN and GIT, but like coding PHP and Ruby mostly via VIM, i’ve also done versioning from the command line. But this time I want to learn to build a new project from the ground up, in a more, let’s say, academic way (instead of the hackery to date). Looking at e. g. Eclipse frightens me. Then there is Struts, Spring, JPA, Hibernate, Seam, just to throw in some buzzwords, that I cannot put into clear relation to each other. Can you point me to some tutorials or books that could help me? What are the technologies you absolutely have to know, the JSRs that are widely implemented in the industry? Or, if you are an employer: What does a “Junior Java Web developer” have to know? Thanks for your suggestions!

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  • Getting out of web-development before I make a huge investment? [closed]

    - by zhenka
    I am still in college. I've been doing web-app development for about a year now and I'm growing to hate it more and more. The whole thing feels like a huge hack and I am loosing my interest in programming because of it. Too much time is spent on learning tricks and libraries in javascript/css/html and battling the statelessness of it all. I don't so much mind back-end development, I just hate ALL of the frontend technology stack. What attracted me to programming was software architecture. I love design patterns, clean code, etc... I just feel like there is a lot more to play with in that regard in other forms of development. Moreover I feel like by becoming a Java or .Net expert I will be able to do A LOT more in terms of career choices. I would be able to do anything from server-side to desktop to mobile, but ruby, javascript, php, css etc... makes me completely unemployable in any other sub-domain of SE. Plus most of the learning on web seems to be technology tricks rather then becoming a better developer and expanding one's mind. Should I get out of it and start coding side mobile projects before I invest too much into it? Does anyone have any advice or perhaps share this feeling and moved out of it successfully? Thanks!

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  • How to enable services Discovery API in GoogleCL?

    - by Marcos
    There are bits and pieces of information all over the place but I'm trying to put it all together so that GoogleCL finally accesses more than the initial 7 services. Does anyone know of a step-by-step? Right now any attempt outside these result in the error message: google tasks list Did you specify the service correctly? Must be one of 'picasa', 'blogger', 'youtube', 'docs', 'contacts', 'calendar', 'finance' I installed GoogleCL from the Ubuntu repos, authenticated a few bundled services like contacts, docs etc. and those work great, giving me access to do certain operations like upload from the command line. I would really like to get it going to support tasks and all the other elegible Google services shown at https://code.google.com/apis/explorer/#_s=tasks Here are some guides/partial steps I've found: http://code.google.com/p/googlecl/wiki/DiscoveryManual (indicates needing to check it out updated GoogleCL from the subversion repository.) http://code.google.com/p/google-api-python-client/wiki/Installation easy_install --upgrade google-api-python-client http://code.google.com/p/googlecl/wiki/Install http://code.google.com/p/googlecl/source/checkout sudo -i cd /usr/local/src/ svn checkout http://googlecl.googlecode.com/svn/trunk/ googlecl-read-only cat googlecl-read-only/INSTALL.txt cd /usr/local/src/googlecl-read-only/ python setup.py install Result: $ google discovery list Traceback (most recent call last): File "/usr/bin/google", line 488, in run_interactive run_once(options, args) File "/usr/bin/google", line 540, in run_once options.config) File "/usr/bin/google", line 364, in import_service force_gdata_v1 = config.lazy_get(package.SECTION_HEADER, AttributeError: 'module' object has no attribute 'SECTION_HEADER'

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  • How do you prefer to handle image spriting in your web projects?

    - by Macy Abbey
    It seems like these days it is pretty much mandatory for web applications to sprite images if they want many images on their site AND a fast load time. (Spriting is the process of combining all images referenced from a style sheet into one/few image(s) with each reference containing a different background position.) I was wondering what method of implementing sprites you all prefer in your web applications, given that we are referring to non-dynamic images which are included/designed by the programming team and not images which are dynamically uploaded by a third party. 1. Add new images to an existing sprite by hand, create new css reference by hand. 2. Generate a sprite server-side from your css files which all reference single images set to be background images of an html element that is the same size of the image you are spriting once per build and update all css references programmatically. 3. Use a sprite generating program to generate a sprite image for you once per release and hand insert the new css class / image into your project. 4. Other methods? I prefer two as it requires very little hand-coding and image editing.

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  • Ubuntu security with services running from /opt

    - by thejartender
    It took me a while to understand what's going on here (I think), but can someone explain to me if there are security risks with regards to my logic of what's going on here as I am trying to set up a home web server as a developer with some good Linux knowledge? Ubuntu is not like other systems, as it has restricted the root user account. You can not log in as root or su to root. This was a problem for me as I have had to install numerous applications and services to /opt as per user documentation (XAMPPfor Linux is a good example). The problem here is that this directory is owned by root:root. I notice that my admin user account does not belong to root group through the following command: groups username so my understanding is that even though the files and services that I place in /opt belong to root, executing them by means of sudo (as required) does not mean that they are run as root? I imagine that the sudo command is hidden somewhere under belonging to the root user and has a 775 permission? So the question I have is if running a service like Tomcat, Apcahe, etc exposes my system like on other systems? Obviously I need to secure these in configurations, but isn't the golden rule to never run something as root? What happens if I have multiple services running under same user/group with regards to a compromised server?

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  • Web hosting providers for businesses (with offsite backups, disaster recovery options, etc.) [closed]

    - by Harry Muscle
    Possible Duplicate: How to find web hosting that meets my requirements? I'm wondering if anyone can point me in the direction of a couple of web hosting providers that are geared towards businesses. By this I mean providers that make it easy to create daily off site backups, are aware that websites require disaster recovery options and have these in place or are able to assist with them, etc. We currently have about a dozen sites with various providers, however, I've been asked to consolidate all of these into one provider and create a full disaster recovery plan. Unfortunately it seems like most providers are geared towards average users that don't require all these extra bells and whistles that businesses need. For example, HostGator, which is a very popular and well reviewed provider, doesn't even allow you to schedule full backups, they have to be manually requested via cPanel and then downloaded once available. If anyone can point out a couple companies that might be able to help with these sorts of things that would be much appreciated. Thanks, Harry P.S. I should also add that we are hoping to stay away from having to manage our own server, we're hoping for a fully managed solution like what HostGator would offer for example.

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  • web browsing vs. torrent traffic, and bandwidth priority?

    - by suli8
    recently i did download big torrent files. (120 Gb). and i need to seed them back to at least 1.5 ratio. my upload speed is 130 Kb/s max. the problem is that i need to seed them as fast as possible. but i browse the web a lot. and browsing with no upload left, can be very frustrating. I'm looking for something like this, torrent are on max. seeding rate, but when the browser needs the bandwidth, it gets it. priority is to web browser, but when not needed, torrent can be at max. i'm aware that i can change torrent client max speed. but doing it manually everytime and every 5 minutes or so, is hard. Info: i'm using firefox/chrome my torrent client is Ktorrent i'm on 11.10 with unity i do have a router, it's a HAG. and i can't access all it's properties. is this possible even? changing the priority in the system monitor for the applications can do the job?the nice value i mean. is there a way to set priority bandwidth usage for different apps? thank you!

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  • Web development and tips for building a website and the advantages of using HTML 5 in the site

    - by Siddarth
    I am trying to make a website for my college, and the program starts from jan 13 and we get 15 days of time to develop a running site. The best site will become the college site. I am participating, for all these days i used to participate in C and C++ contests and also won a few contests, now i am really into web dev for the last 2 months. I knew HTML long ago recently i brushed up on it and learnt javascript from "javascript and jquery the missing manual"(sorry for not adding the link) and recently bought "PHP and MySQL web development" and I am going on fine with it, but still a lot of pages to cover in that book. After this what do i need to know ajax is one language to concentrate on, what else do i need to do to make this project up and running. Can someone let me know the tricks of this trade and complete information to build a site like this. Right now i am good with javascript HTML and CSS and thats it, what else I am studying HTML5 and CSS3 its pretty fast and neat. The info on site is a college website which includes students profiles where the have to register their info with college id number and pretty much thats it. Think of it as a college site + a social networking site for students, where they can upload there pics and videos pdf books etc.

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  • Managed Cloud Services Wins Another Prestigious Industry Award

    - by Dori DiMassimo-Oracle
    Over the last 90 days, Oracle Managed Cloud Services has been the proud recipient of TWO prestigious industry awards for service excellence and customer value leadership.  The most recent award is last month's 2014 Frost & Sullivan Best Practice Award - North America Managed Cloud Customer Value Leadership Award, which rated Oracle Managed Cloud Services as the clear leader versus other providers; Managed Cloud received an "exceptional" rating in 9 of 10 evaluation categories.  The research report  is an excellent look at our industry and what is valued by cloud customers looking for a managed solution.   In April, Managed Cloud was a repeat winner of the Outsourcing Excellence Award - 2014 Outsourcing Excellence Award - Best ITO Infrastructure (Sony Computer Entertainment America).  Last year we won the award for Best Cloud: 2013 Outsourcing Excellence Award - Best Cloud (Take-Two Interactive)  These awards are a great testimony of the transformation of Managed Cloud Services to a true Cloud-based business and a strategic and relevant part of the Oracle Cloud Solutions portfolio.  Frost & Sullivan, in particular, recognizes our vision and our capability of successfully managing business transactions in the cloud.

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  • Is there an open source version check library and web app?

    - by user52485
    I'm a developer for a cross platform (Win, MacOS, Linux) open source C++ application. I would like to have the program occasionally check for the latest version from our web site. Between the security, privacy, and cross platform network issues, I'd rather not roll our own solution. It seems like this is a common enough thing that there 'ought' to be a library/app which will do this. Unfortunately, the searches I've tried come up empty. Ideally, the web app would track requests and process the logs into some nice reports (number of users, what version, what platform, frequency of use, maybe even geographical info from IP address, etc.). While appropriately respecting privacy, etc. What pre-existing tools can help solve this problem? Edits: I am looking for a reporting tool, not a dependency checker. Our project has the challenge of keeping up with our users. Most do not join the mailing list. Our project has not been picked up by major distributions -- most of our users are Windows/MacOS anyway. When a new version comes out, we have no way of informing our users of its existence. Development is moving pretty fast, major features added every few months. We would like to provide the user with a way to check for an updated version. While we're at it, we would like to use these requests for some simple & anonymous usage tracking (X users running version Y with Z frequency, etc.). We do not need/want something that auto-updates or tracks dependencies on the system. We are not currently worried about update size -- when the user chooses to update, we expect them to download the complete latest version. We would like to keep this as simple as possible.

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  • Is there a website that scrapes job postings to determine the popularity of web technologies? [closed]

    - by dB'
    I'm often in a position where I need to choose between a number of web technologies. These technologies might be programming languages, or web application frameworks, or types of databases, or some other kind of toolkit used by programmers. More often than not, after some doing research, I end up with a list of contenders that are all equally viable. They're all powerful enough to solve my problem, they're all popular and well supported, and they're all equally familiar/unfamiliar to me. There's no obvious rationale by which to choose between them. Still, I need to pick one, so at this point I usually ask myself a hypothetical question: which one of these technologies, if I invest in learning it, would be most helpful to me in a job search? Where can I go on the internet to answer this question? Is there a website/service that scrapes the texts of worldwide job postings and would allow me to compare, say, the number of employers looking for expertise in technology x vs. technology y? (Where x and y are Rails vs. Djando, Java vs. Python, Brainfuck vs. LOLCode, etc.)

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  • DataContractSerializer and deserializing web service response types

    - by matra
    Hi, I am using calling web services and using WCF generated service-reference on the client. I have saved XML responses that are received from test service to disk (without SOAP envelope and body tags) I would like to load them from disk and create objects from them. Lets' take the following method from my web service: SomeMethodResponse SomeMethod(SomeMethodRequest req) I manually (through SOAP UI) save the response to disk to file, Sample response: < SomeMethodResponse xmlns="http://myNamespace"> <SomeMember1>value</SomeMember1> </SomeMethodResponse xmlns="http://myNamespace"> Then I try to deserialize the object from file using: DataContractSerializer dcs = new DataContractSerializer(typeof(SomeMethodResponse)) This fails – the serializer complains with the error, that it is expecting element in namespace 'http://schemas.datacontract.org/2004/07', but found element in 'http://myNamespace'. Question: Why does the DataContractSerializer not use the namespace, that is declared on SomeMethodResponseType with XmlTypeAttribute(Namespace="http://myNamespace")? I can work around this by explicitly providing the namespace and the root element to DataContractSerializer constructor. But then it fails with message similar to: Error in line X position Y (last line of the XMLdocument). 'EndElement' 'SomeMethodResponse from namespace 'httpmyNapespace’ is not expected. Expecting element 'someNameField'. SomeName is an element in the XSD that web service is using. It is also a property on the SomeMethodResponse type, backed by the private field called someNameField. It looks like DataContractSerializer is trying to deserialize the fields in addition to properties. How can I deserailize XML that I have saved from disk and get back the object of same type that SomeMethod is returning? Thanks, Matra

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  • WCF Web Service Gives 404 error in Azure

    - by landyman
    I'm new to using WCF and Azure, but I have a WCF Web Service that works correctly when debugging in Visual Studio. I set the startup project to Azure, and I get 404 errors for any URL I try related to the service. Here is what I think is relavant code: From IWebService.cs [OperationContract] [WebGet(UriTemplate = "GetData/Xml?value={value}", ResponseFormat=WebMessageFormat.Xml)] string GetDataXml(string value); and from Web.config: <system.serviceModel> <services> <service name="WebService" behaviorConfiguration="WebServiceBehavior"> <!-- Service Endpoints --> <endpoint address="" binding="webHttpBinding" contract="IWebService" behaviorConfiguration="WebEndpointBehavior"></endpoint> <endpoint address="ws" binding="wsHttpBinding" contract="IWebService"/> <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/> </service> </services> <behaviors> <serviceBehaviors> <behavior name="WebServiceBehavior"> <serviceMetadata httpGetEnabled="true"/> <serviceDebug includeExceptionDetailInFaults="true"/> </behavior> </serviceBehaviors> <endpointBehaviors> <behavior name="WebEndpointBehavior"> <webHttp/> </behavior> </endpointBehaviors> </behaviors> </system.serviceModel> I have tried changing the binding to 'basicHttpBinding', but that had no luck. Thanks in advance for any help!

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  • Create an ASMX web service from a WSDL file

    - by metanaito
    I have a WSDL file and I am trying to create a web service that conforms to the WSDL. I've created clients using WSDL files that consume an existing service, but I've never created a web service that needed to follow a specific WSDL. I've gone as far as using: wsdl.exe mywsdl.wsdl /l:VB /serverInterface Now I've got a .vb file generated from that WSDL. However I am not sure what I'm supposed to do with this VB file. It looks like it's got a public interface in there but no class that implements the interface. It also has a bunch of partial classes for the types in the WSDL. I was expecting there to be some sort of stub where I put in the code to complete the service calls. I've only created simple web services before and none of them used public interfaces so I'm unfamiliar with what is going on here. At this point I'm not sure how I use the generated .vb file and make it work with an .asmx file and what additional coding is needed to complete the interface.

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  • C# Web Reference and PHP

    - by Louis
    I am attempting to call a Web Service (created in PHP) from my C# application. I have successfully added the Web Reference in Visual Studios, however I cannot figure out exactly how to invoke the call to the web service. I have been following this tutorial: http://sanity-free.org/article25.html however when I try and compile I get a "The type or namespace name 'SimpleService' could not be found". My C# code is as follows: using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.IO; namespace inVision_OCR { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void translateButton_Click(object sender, EventArgs e) { // We need to snap the image here somehow . . . // Open up the image and read its contents into a string FileStream file = new FileStream("\\Hard Disk\\ocr_images\\test.jpg", FileMode.Open); StreamReader sr = new StreamReader(file); string s = sr.ReadToEnd(); sr.Close(); // Using SOAP, pass this message to our development server SimpleService svc = new SimpleService(); string s1 = svc.getOCR("test"); MessageBox.Show(s); } } } Any help would be appreciated.

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  • How do you clean Core Data generated models and code from a project?

    - by Hazmit
    I'm having an extremely annoying problem with Core Data in the iPhone SDK. I would say in general Core Data for the most part appears easy to use and nice to implement. I have a sqlite database that is being used as a read only reference to pull data elements out for an iPhone app. It would seem there are really mysterious issues relating to what seems to be migration of the database to the most recent versions of my schema. Why can't you just clean out your stored objects and models and let a project redo all of it when you compile next? You would think if you setup a stored object model there would be a way to just reset it and recompile. I've tried what feels like a thousand 'tips' that have been the results of hours of google searches and documentation prowling to figure out how to do this. My most recent error during compile time is below. 2010-04-07 18:23:51.891 PE[1962:207] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Can't merge models with two different entities named 'PElement'' All of this code has been working in the simulator and is only causing me troubles now because I made a change to the schema. I also have the database options for automatically migrating set as below. NSMutableDictionary *optionsDictionary = [NSMutableDictionary dictionary]; [optionsDictionary setObject:[NSNumber numberWithBool:YES] forKey:NSMigratePersistentStoresAutomaticallyOption]; [optionsDictionary setObject:[NSNumber numberWithBool:YES] forKey:NSInferMappingModelAutomaticallyOption];

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  • Returning UTF-8 from a web service

    - by Marco Shaw
    Previous: Returning info from a Web Service I thought the previous answer made 100% sense, and I though I was out of the woods, but it still fails. An app I'm working with still seems to think what is being returned from the web service is ASCII encoded. Debugging it shows: <Envelope><Body><ReturnOneResponse><ReturnOneResult>&lt;xml version="1.0" encoding="UTF-8"&gt;&lt;Entry&gt;&lt;Symbol&gt;PACR&lt;/Symbol&gt;&lt;Company&gt;Pacer International, Inc.&lt;/Company&gt;&lt;MarketCap&gt;$229.0M&lt;/MarketCap&gt;&lt;PE&gt;18.7&lt;/PE&gt;&lt;Price&gt;6.56&lt;/Price&gt;&lt;Change&gt;0.42&lt;/Change&gt;&lt;PctChange&gt;6.84%&lt;/PctChange&gt;&lt;YTDChange&gt;107.59%&lt;/YTDChange&gt;&lt;/Entry&gt;</ReturnOneResult></ReturnOneResponse></Body></Envelope> So everything being returned from the web service seems to be changed into ASCII, and seems to refuse to read as UTF-8. Since my previous code in the above link, I also changed my string invocation: string value = @""; Still, that didn't help. Any other ideas?

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  • Best way to change jqGrid rowNum from ALL to -1 before pass to a web service

    - by Billyhole
    I'm looking to find the best way to allow users to choose to show ALL records in a jqGrid. I know that a -1 value passed for the rows parameter denotes ALL, but I want the word "ALL" not a -1 to appear in the rowList select element, ie. rowList: [15, 50, 100, 'ALL']. I'm passing the grid request to a web service which accepts an int for "rows", and I'm trying find how and when I should change the user selected value of "ALL" to a -1 before it gets sent to the web service. Below is my cleaned up grid code. I tried some various code blocks before my $.ajax in the datatype function. But most attempts just seemed like I have to be doing this the most convoluted way I possibly could. For example, datatype: function(postdata) { if ($("#gridTableAssets").jqGrid('getGridParam', 'rowNum') == 'ALL') { $("#gridTableAssets").appendPostData({ "rows": -1, "page": 1 }); } $.ajax({... But doing that seemed to cause the actual "page" GridParam to be nulled out on subsequent grid actions, forcing me handle that in other places. There just seems like this is something that would be frequently done out there and have clean way of doing it. Cleaned grid code: $("#gridTableAssets").jqGrid({ datatype: function(postdata) { $.ajax({ url: "/Service/Repository.asmx/GetAssets", data: JSON.stringify(postdata), type: 'POST', contentType: "application/json; charset=utf-8", error: function(XMLHttpRequest, textStatus, errorThrown) { alert('error'); }, success: function(msg) { var assetsGrid = $("#gridTableAssets")[0]; assetsGrid.addJSONData(JSON.parse(msg)); ... } }); }, ... pager: $('#pagerAssets'), rowNum: 15, rowList: [15, 50, 100, 'ALL'], ... onPaging: function(index, colindex, sortorder) { SessionKeepAlive(); } }); And here is the web service [WebMethod] public string GetAssetsOfAssetStructure(bool _search, int rows, int page, string sidx, string sord, string filters)

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  • UITableView and UITableCellView, how does this work with core plot ?

    - by Luc
    Hello, I'm very new to iPhone programming, and I'm currently following tutos to understand the whole thing. I've been able to do what I needed (retrive data from a JSON http server, parse them with YAJL and plot the data in core plot). I have done this in a "simple" view where I have added a UILayerHostingView as requested by core-plot. I am now trying to follow this tuto: http://blogs.remobjects.com/blogs/mh/2010/01/26/p973 but I am missing the first part regarding the views... My understanding is that I need to create a view with a UITableView first. Then add a UITableCellView to make the first cell be able to contain the graph ? Is this right ? Where does the method "(id)initWithStyle:(UITableViewCellStyle)style" come from ? For my needs, only the first cell needs to contain a graph, I will put some other info in the other cells. As for now, I have created a new GraphListViewController, in the corresponding view I have added a listview but I do not see any auto generated methods regading cell customisation ? Do I need to implements DataSource in this controller and manually add some customisation methods ? Do I need to add a UITagbleViewCell to this UITableViewTable within IB ? Hope I am not getting to confusing... Thanks a lot for your help, Best Regards, Luc

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  • Coldfusion Web Service Response Problem

    - by Ivan Paloscia
    I have a problem with the Web Service I recently developed. The problem is about the Web Service response. More precisely sometimes the Web Service sends back the following response: <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <soapenv:Body> <ns1:GetConstants2Response soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" xmlns:ns1="http://usermanagerwstest"> <GetConstants2Return xsi:type="ns2:CFComponentSkeleton" xmlns:ns2="http://rpc.xml.coldfusion"/> </ns1:GetConstants2Response> </soapenv:Body> </soapenv:Envelope> Instead the correct response (that sometimes shows up in an intermittent way) is reported below: <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <soapenv:Body> <ns1:GetConstants2Response soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" xmlns:ns1="http://usermanagerwstest"> <GetConstants2Return xsi:type="ns1:Constants2"> <BooleanTypeFalse xsi:type="xsd:string">0</BooleanTypeFalse> <BooleanTypeTrue xsi:type="xsd:string">1</BooleanTypeTrue> <GenderFemale xsi:type="xsd:string">F</GenderFemale> <GenderMale xsi:type="xsd:string">M</GenderMale> <LanguageEnglish xsi:type="xsd:string">inglese</LanguageEnglish> <LanguageItalian xsi:type="xsd:string">italiano</LanguageItalian> </GetConstants2Return> </ns1:GetConstants2Response> </soapenv:Body> </soapenv:Envelope> Where does the CFCComponentSkeleton comes from? I thank everybody in advance.

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  • How do I bind an iTunes style source list to an NSTableView using Core Data?

    - by Austin
    I have an iTunes style interface in my application: Source list (NSOutlineView) on the left that contains different libraries and playlists with an NSTableView on the right side of the interface displaying information for "Presentations". Similar to iTunes, I am showing the same type of information in the table view whether a library or playlist is selected (title, author, date created, etc). I currently have an NSArrayController connected to my NSTableView and was setting the fetch predicate based on what was selected in the source list. This works fine when selecting a library because I can just set the fetch predicate to filter by the "type" field in my Presentation Core Data entity. When I try to adjust the fetch predicate for the playlist however, it doesn't look like there is any way to set the fetch predicate because I've got a table in between Playlists and Presentations to keep up with the order within the Playlist. According to the Apple docs, these type of predicates are not doable with Core Data (it basically doesn't multiple inner joins). Below is the relevant portion of my Data Model. Is my data model setup incorrectly? Should I drop the NSArrayController and handle connecting the NSTableView up by hand? I'm trying to figure out if there is a simple fix, or really a design flaw.

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  • How to maintain an ordered table with Core Data (or SQL) with insertions/deletions?

    - by Jean-Denis Muys
    This question is in the context of Core Data, but if I am not mistaken, it applies equally well to a more general SQL case. I want to maintain an ordered table using Core Data, with the possibility for the user to: reorder rows insert new lines anywhere delete any existing line What's the best data model to do that? I can see two ways: 1) Model it as an array: I add an int position property to my entity 2) Model it as a linked list: I add two one-to-one relations, next and previous from my entity to itself 1) makes it easy to sort, but painful to insert or delete as you then have to update the position of all objects that come after 2) makes it easy to insert or delete, but very difficult to sort. In fact, I don't think I know how to express a Sort Descriptor (SQL ORDER BY clause) for that case. Now I can imagine a variation on 1): 3) add an int ordering property to the entity, but instead of having it count one-by-one, have it count 100 by 100 (for example). Then inserting is as simple as finding any number between the ordering of the previous and next existing objects. The expensive renumbering only has to occur when the 100 holes have been filled. Making that property a float rather than an int makes it even better: it's almost always possible to find a new float midway between two floats. Am I on the right track with solution 3), or is there something smarter?

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  • How to Declare Complex Nested C# Type for Web Service

    - by TheArtTrooper
    I would like to create a service that accepts a complex nested type. In a sample asmx file I created: [WebService(Namespace = "http://tempuri.org/")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] // To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. // [System.Web.Script.Services.ScriptService] public class ServiceNest : System.Web.Services.WebService { public class Block { [XmlElement(IsNullable = false)] public int number; } public class Cell { [XmlElement(IsNullable = false)] public Block block; } public class Head { [XmlElement(IsNullable = false)] public Cell cell; } public class Nest { public Head head; } [WebMethod] public void TakeNest(Nest nest) { } } When I view the asmx file in IE the test page shows the example SOAP post request as: <?xml version="1.0" encoding="utf-8"?> <soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"> <soap:Body> <TakeNest xmlns="http://schemas.intellicorp.com/livecompare/"> <nest> <head> <cell> <block xsi:nil="true" /> </cell> </head> </nest> </TakeNest> </soap:Body> </soap:Envelope> It hasn't expanded the <block> into its number member. Looking at the WSDL, the types all look good. So is this just a limitation of the post demo page creator? Thanks.

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  • can a webservice load jars during run time

    - by KItis
    I have created a simple web-service using Java. i want to load jars related to web-service during runtime. I have done this task for normal Java application. there what I did was JarFile jar = new JarFile(f.getPath()); final Manifest manifest = jar.getManifest(); final Attributes mattr = manifest.getMainAttributes(); // Read the manifset in jar files and get the Name attribute // whare it specified the class that need to load //for (Object a : mattr.keySet()) { for (Iterator iter = mattr.keySet().iterator(); iter.hasNext();) { Object obj = (Object)iter.next(); if ("ServiceName".equals(obj.toString())) className = mattr.getValue((Name) obj); //System.out.println(className); } /* * Create the jar class loader and use the first argument passed * in from the command line as the jar file to use. */ JarClassLoader jarLoader = new JarClassLoader(f.getPath()); /* Load the class from the jar file and resolve it. */ Class c = jarLoader.loadClass(className, true); My problem is can I put jars that need to be loaded during run time in to separate folder rather than putting in to WEBINF folder. do i have to put jars both in axis and web-application. thanks in advance for any contribution for this question.

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