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  • Automatically calling OnDetaching() for Silverlight Behaviors

    - by Dan Auclair
    I am using several Blend behaviors and triggers on a silverlight control. I am wondering if there is any mechanism for automatically detaching or ensuring that OnDetaching() is called for a behavior or trigger when the control is no longer being used (i.e. removed from the visual tree). My problem is that there is a managed memory leak with the control because of one of the behaviors. The behavior subscribes to an event on some long-lived object in the OnAttached() override and should be unsubscribing to that event in the OnDetaching() override so that it can become a candidate for garbage collection. However, OnDetaching() never seems to be getting called when I remove the control from the visual tree... the only way I can get it to happen is by explicit detaching the behavior BEFORE removing the control and then it is properly garbage collected. Right now my only solution was to create a public method in the code-behind for the control that can go through and detach any known behaviors that would cause garbage collection problems. It would be up to the client code to know to call this before removing the control from the panel. I don't really like this approach, so I am looking for some automatic way of doing this that I am overlooking or a better suggestion. public void DetachBehaviors() { foreach (var behavior in Interaction.GetBehaviors(this.LayoutRoot)) { behavior.Detach(); } //... //continue detaching all known problematic behaviors.... }

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  • MissingMethodException when running application on different computer

    - by Codesleuth
    I have a problem where I compiled my application on Visual Studio 2010 while targetting the .NET Framework 3.5, deployed it to a client server, only to find it gives me the following error: ************** Exception Text ************** System.MissingMethodException: Method not found: 'Void System.Xml.Xsl.XslCompiledTransform.Transform( System.Xml.XPath.IXPathNavigable, System.Xml.Xsl.XsltArgumentList, System.Xml.XmlWriter, System.Xml.XmlResolver)'. ************** Loaded Assemblies ************** [...] System.Xml Assembly Version: 2.0.0.0 Win32 Version: 2.0.50727.3082 (QFE.050727-3000) CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Xml/2.0.0.0__b77a5c561934e089/System.Xml.dll The method it says it's looking for is this: XslTransform.Transform Method (IXPathNavigable, XsltArgumentList, XmlWriter, XmlResolver) (Supported in: 4, 3.5, 3.0, 2.0, 1.1) I've tried setting up a redirect to the .NET Framework 4.0 version of the same DLL using the assemblyBinding element like so: <runtime> <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"> <dependentAssembly> <assemblyIdentity name="System.Xml" publicKeyToken="b77a5c561934e089" culture="neutral" /> <bindingRedirect oldVersion="2.0.0.0" newVersion="4.0.0.0"/> <codeBase version="4.0.0.0" href="file:///C:/WINDOWS/Microsoft.NET/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll" /> </dependentAssembly> </assemblyBinding> </runtime> But now the application won't run, and puts this in the event log: EventType clr20r3, P1 myapplication.exe, P2 3.85.12.27583, P3 4be9757f, P4 system.configuration, P5 2.0.0.0, P6 4889de74, P7 1a6, P8 136, P9 ioibmurhynrxkw0zxkyrvfn0boyyufow, P10 NIL. So, in summary, (1) does anyone know why the application can't find the method listed, and (2) why doesn't it let me redirect to the .NET 4.0 version of System.Xml? Any help is appreciated, I'm totally stuck!

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  • Explicit behavior with checks vs. implicit behavior

    - by Silviu
    I'm not sure how to construct the question but I'm interested to know what do you guys think of the following situations and which one would you prefer. We're working at a client-server application with winforms. And we have a control that has some fields automatically calculated upon filling another field. So we're having a field currency which when filled by the user would determine an automatic filling of another field, maybe more fields. When the user fills the currency field, a Currency object would be retrieved from a cache based on the string introduced by the user. If entered currency is not found in the cache a null reference is returned by the cache object. Further down when asking the application layer to compute the other fields based on the currency, given a null currency a null specific field would be returned. This way the default, implicit behavior is to clear all fields. Which is the expected behavior. What i would call the explicit implementation would be to verify that the Currency object is null in which case the depending fields are cleared explicitly. I think that the latter version is more clear, less error prone and more testable. But it implies a form of redundancy. The former version is not as clear and it implies a certain behavior from the application layer which is not expressed in the tests. Maybe in the lower layer tests but when the need arises to modify the lower layers, so that given a null currency something else should be returned, i don't think a test that says just that without a motivation is going to be an impediment for introducing a bug in upper layers. What do you guys think?

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  • ASP.Net: Writing chunks of file..HTTP File upload with resume..

    - by Manish
    Please refer to question: http://stackoverflow.com/questions/2062852/resume-in-upload-file-control Now to find a solution for the above question, I want to work on it and develop a user control which can resume a HTTP File Upload process. For this, I'm going to create a temporary file on server until the upload is complete. Once the uploading is done completely then will just save it to the desired location. The procedure I have thought of is: Create a temporary file with a unique name (may be GUID) on the server. Read a chunk of file and append it to this temp file on the server. Continue step 1 to 3 until EOF is reached. Now if the connection is lost or user clicks on pause button, the writing of file is stopped and the temporary file is not deleted. Clicking on resume again or uploading the same file again will check on the server if the file exists and user whether to resume or to overwrite. (Not sure how to check if it's the same file. Also, how to step sending the chunks from client to server.) Clicking on resume will start from where it is required to be uploaded and will append that to the file on the server. (Again not sure how to do this.) Questions: Are these steps correct to achieve the goal? Or need some modifications? I'm not sure how to implement all these steps. :-( Need ideas, links... Any help appreciated...

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  • Reusing service proxies

    - by Hadi Eskandari
    I have a set of webservices that I connect to using Silverlight Client. I use proxies generated by "Add service reference" or SLSVCUTIL.exe tool to connect to this service. So far, I have only used one single service. Now I want to use another service on the same server. The problem is that, first service generated set of proxy classes for me, and second service will reuse the same set of classes (plus extra services/classes), e.g. CustomerService.SaveCustomer(Customer customer); OrderService.CheckCustomerLevel(Customer customer); The problem is when I add reference to the second service, I can not reuse the same namespace for the second one (VS error), and when I use a different namespace, the generated classes, although are essentially the same, reside in different namespace, hence different and I end up with two Customer classes in two different namespaces. Anyway around this? I just neeed to have two set of services, reusing the Customer class. I have already tried "reuse types in assembly / all assemblies" check mark when generating proxy classes, but it seems to have no effect. any help is greatly appreciated.

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  • Request for the permission of type 'System.Web.AspNetHostingPermission' failed when compiling web si

    - by ahsteele
    I have been using Windows 7 for a while but have not had to work with a particular legacy intranet application since my upgrade. Unfortunately, this application is setup as an ASP.NET Website project hosted on a remote server. When I have the website open in Visual Studio 2008 and try to debug it I get the following compiler error: Request for the permission of type 'System.Web.AspNetHostingPermission' failed To resolve this issue on Windows Vista machines, I would change the machine's .NET Security Configuration trust level to full for the local intranet (fix outlined here). I believe this configuration utility relied upon the mscorcfg.msc which from some cursory research appears to be apart of the .NET 2.0 SDK. I have tried to follow the instructions from this Microsoft Support article running the command below to no avail. Drive:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\caspol.exe -m -ag 1 -url "file:////\\computername\sharename\*" FullTrust -exclusive on Presently, I have the following .NET and ASP.NET components installed on my machine Microsoft .NET Compact Framework 2.0 SP2 Microsoft .NET Compact Framework 3.5 Microsoft .NET Framework 4 Client Profile Microsoft .NET Framework 4 Extended Microsoft .NET Framework 4 Multi-Targeting Pack Microsoft ASP.NET MVC 1.0 Microsoft ASP.NET MVC 2 Microsoft ASP.NET MVC 2 - Visual Studio 2008 Tools Microsoft ASP.NET MVC 2 - Visual Studio 2010 Tools Do I need to install the .NET 2.0 SDK? Am I issuing the caspol command incorrectly? Is there something else that I am missing?

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  • C++ JSON parser

    - by pollux
    Dear reader, I'm working on a twitter client which uses the twitter streaming json api. Twitter advices JSON as XML version is deprecated. I'm looking for a good JSON parser which can parse the json data below. I'm receiving this JSON which I want to be able to read/parse using a JSON parser. { "in_reply_to_status_id": null, "text": "Home-plate umpire Crawford gets stung http://tinyurl.com/27ujc86", "favorited": false, "coordinates": null, "in_reply_to_user_id": null, "source": "<a href=\"http://apiwiki.twitter.com/\" rel=\"nofollow\">API</a>", "geo": null, "created_at": "Fri Jun 18 15:12:06 +0000 2010", "place": null, "user": { "profile_text_color": "333333", "screen_name": "HostingViral", "time_zone": "Pacific Time (US & Canada)", "url": "http://bit.ly/1Way7P", "profile_link_color": "228235", "profile_background_image_url": "http://s.twimg.com/a/1276654401/images/themes/theme14/bg.gif", "description": "Full time Internet Marketer - Helping other reach their Goals\r\nhttp://wavemarker.com", "statuses_count": 1944, "profile_sidebar_fill_color": "c7b7c7", "profile_background_tile": true, "contributors_enabled": false, "lang": "en", "notifications": null, "created_at": "Wed Dec 30 07:50:52 +0000 2009", "profile_sidebar_border_color": "120412", "following": null, "geo_enabled": false, "followers_count": 2485, "protected": false, "friends_count": 2495, "location": "Working at Home", "name": "Johnathan Thomas", "verified": false, "profile_background_color": "131516", "profile_image_url": "http://a1.twimg.com/profile_images/600114776/nessykalvo421_normal.jpg", "id": 100439873, "utc_offset": -28800, "favourites_count": 0 }, "in_reply_to_screen_name": null, "id": 16477056501, "contributors": null, "truncated": false } *This is the raw string (above it beautified) * {"in_reply_to_status_id":null,"text":"Home-plate umpire Crawford gets stung http://tinyurl.com/27ujc86","favorited":false,"coordinates":null,"in_reply_to_user_id":null,"source":"<a href=\"http://apiwiki.twitter.com/\" rel=\"nofollow\">API</a>","geo":null,"created_at":"Fri Jun 18 15:12:06 +0000 2010","place":null,"user":{"profile_text_color":"333333","screen_name":"HostingViral","time_zone":"Pacific Time (US & Canada)","url":"http://bit.ly/1Way7P","profile_link_color":"228235","profile_background_image_url":"http://s.twimg.com/a/1276654401/images/themes/theme14/bg.gif","description":"Full time Internet Marketer - Helping other reach their Goals\r\nhttp://wavemarker.com","statuses_count":1944,"profile_sidebar_fill_color":"c7b7c7","profile_background_tile":true,"contributors_enabled":false,"lang":"en","notifications":null,"created_at":"Wed Dec 30 07:50:52 +0000 2009","profile_sidebar_border_color":"120412","following":null,"geo_enabled":false,"followers_count":2485,"protected":false,"friends_count":2495,"location":"Working at Home","name":"Johnathan Thomas","verified":false,"profile_background_color":"131516","profile_image_url":"http://a1.twimg.com/profile_images/600114776/nessykalvo421_normal.jpg","id":100439873,"utc_offset":-28800,"favourites_count":0},"in_reply_to_screen_name":null,"id":16477056501,"contributors":null,"truncated":false} I've tried multiple JSON parsers from json.org though I've tried 4 now and can't find one which can parse above json. Kind regards, Pollux

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  • org.apache.cxf.interceptor.Fault: Unmarshalling Error: Duplicate default namespace declaration.

    - by JohnC
    Not sure why I am receiving this after the webservice ran and I am trying to return back to my client side bean. The webservice works perfectly outside of my webserver in SoapUI. org.apache.cxf.interceptor.Fault: Unmarshalling Error: Duplicate default namespace declaration. at [row,col {unknown-source}]: [1,321] at org.apache.cxf.jaxb.JAXBEncoderDecoder.unmarshall(JAXBEncoderDecoder.java:764) at org.apache.cxf.jaxb.JAXBEncoderDecoder.unmarshall(JAXBEncoderDecoder.java:623) at org.apache.cxf.jaxb.io.DataReaderImpl.read(DataReaderImpl.java:128) at org.apache.cxf.interceptor.DocLiteralInInterceptor.handleMessage(DocLiteralInInterceptor.java:101) at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:236) at org.apache.cxf.endpoint.ClientImpl.onMessage(ClientImpl.java:671) at org.apache.cxf.transport.http.HTTPConduit$WrappedOutputStream.handleResponseInternal(HTTPConduit.java:2177) at org.apache.cxf.transport.http.HTTPConduit$WrappedOutputStream.handleResponse(HTTPConduit.java:2057) at org.apache.cxf.transport.http.HTTPConduit$WrappedOutputStream.close(HTTPConduit.java:1982) at org.apache.cxf.transport.AbstractConduit.close(AbstractConduit.java:66) at org.apache.cxf.transport.http.HTTPConduit.close(HTTPConduit.java:637) at org.apache.cxf.interceptor.MessageSenderInterceptor$MessageSenderEndingInterceptor.handleMessage(MessageSenderInterceptor.java:62) at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:236) at org.apache.cxf.endpoint.ClientImpl.invoke(ClientImpl.java:483) at org.apache.cxf.endpoint.ClientImpl.invoke(ClientImpl.java:309) at org.apache.cxf.endpoint.ClientImpl.invoke(ClientImpl.java:261) at org.apache.cxf.frontend.ClientProxy.invokeSync(ClientProxy.java:73) at org.apache.cxf.jaxws.JaxWsClientProxy.invoke(JaxWsClientProxy.java:124)

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  • .NET Reference "Copy Local" True / Fasle Being Set Based on Contents of General Assembly

    - by D-Sect
    Hello All. First question for me here. We had a very interesting problem with a Win Forms project. It's been resolved. We know what happened, but we want to understand why it happened. This may help other people out in the future who have a similar problem. The WinForms project failed on 2 of our client's PCs. The error was an obscure kernel.dll error. The project ran fine on 3 other PCs. We found that a .DLL (log4net.dll - a very popular open-source logging library) was missing from our release folder. It was previously in our release folder. Why was it missing in this latest release? It was missing because I must have installed a program on my Dev box that used log4net.dll and it was added to the general assembly. When I checked the SLN's references for log4net.dll, they were changed to "copy local=FALSE". They must have changed automagicially because log4net.dll was present in my GAC. Here's where my question starts: Why did my reference for log4net.dll get changed from COPY LOCAL = TRUE to COPY LOCAL = FALSE? I suspect it's because it was added to my GAC by another program. How can we prevent this from happening again? As it stands now, if I install a piece of software that uses a common library and it adds it to my GAC, then my SLNs that REF that DLL will change from Copy Local TRUE to FALSE. Thank you so much. I hope this helps people out who have a piece of software that runs in some places, but not in others, when it used to run fine in ALL places.

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  • Books and resources for Java Performance tuning - when working with databases, huge lists

    - by Arvind
    Hi All, I am relatively new to working on huge applications in Java. I am working on a Java web service which is pretty heavily used by various clients. The service basically queries the database (hibernate) and then works with a lot of Lists (there are adapters to convert list returned from DB to the interface which the service publishes) and I am seeing lot of issues with the service like high CPU usage or high heap space. While I can troubleshoot the performance issues using a profiler, I want to actually learn about what all I need to take care when I actually write code. Like what kind of List to use or things like using StringBuilder instead of String, etc... Is there any book or blogs which I can refer which will help me while I write new services? Also my application is multithreaded - each service call from a client is a new thread, and I want to know some best practices around that area as well. I did search the web but I found many tips which are not relevant in the latest Java 6 releases, so wanted to know what kind of resources would help a developer starting out now on Java for heavily used applications. Arvind

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  • How do I declare an IStream in idl so visual studio maps it to s.w.interop.comtypes?

    - by Grahame Grieve
    hi I have a COM object that takes needs to take a stream from a C# client and processes it. It would appear that I should use IStream. So I write my idl like below. Then I use MIDL to compile to a tlb, and compile up my solution, register it, and then add a reference to my library to a C# project. Visual Studio creates an IStream definition in my own library. How can I stop it from doing that, and get it to use the COMTypes IStream? It seems there would be one of 3 answers: add some import to the idl so it doesn't redeclare IStream (importing MSCOREE does that, but doesn't solve the C# problem) somehow alias the IStream in visual studio - but I don't see how to do this. All my thinking i s completely wrong and I shouldn't be using IStream at all help...thanks [ uuid(3AC11584-7F6A-493A-9C90-588560DF8769), version(1.0), ] library TestLibrary { importlib("stdole2.tlb"); [ uuid(09FF25EC-6A21-423B-A5FD-BCB691F93C0C), version(1.0), helpstring("Just for testing"), dual, nonextensible, oleautomation ] interface ITest: IDispatch { [id(0x00000006),helpstring("Testing stream")] HRESULT _stdcall LoadFromStream([in] IStream * stream, [out, retval] IMyTest ** ResultValue); }; [ uuid(CC2864E4-55BA-4057-8687-29153BE3E046), noncreatable, version(1.0) ] coclass HCTest { [default] interface ITest; }; };

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  • Exception on apache cxf when calling JaxWsProxyFactoryBean.create() (in maven project)

    - by tzippy
    I wrote a Client that uses a Webservice. Works well in a seperate project. But when I try to use it in my maven project, it fails. The dependencies are correct: <dependency> <groupId>org.apache.cxf</groupId> <artifactId>cxf-rt-frontend-jaxws</artifactId> <version>2.2.8</version> </dependency> <dependency> <groupId>org.apache.cxf</groupId> <artifactId>cxf-rt-transports-http</artifactId> <version>2.2.8</version> </dependency> <!-- Jetty is needed if you're are not using the CXFServlet --> <dependency> <groupId>org.apache.cxf</groupId> <artifactId>cxf-rt-transports-http-jetty</artifactId> <version>2.2.8</version> </dependency> But the error seems to occur calling this method: JaxWsProxyFactoryBean.create(); This is what I get: 10.06.2010 12:50:59 org.apache.cxf.service.factory.ReflectionServiceFactoryBean buildServiceFromClass INFO: Creating Service {http://tempuri.org/}BMWebServiceSoapService from class net.myClassPath.BMWebServiceSoap 2010-06-10 12:51:00.992::WARN: Nested in org.springframework.web.util.NestedServletException: Handler processing failed; nested exception is java.lang.NoClassDefFoundError: javax/wsdl/extensions/soap12/SOAP12Address: java.lang.NoClassDefFoundError: javax/wsdl/extensions/soap12/SOAP12Address Does anyone have a clue? Thanks!

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  • GWT JsonpRequestBuilder Timeout issue

    - by Anthony Kong
    I am getting time out from using JsonpRequestBuilder. The entry point code goes like this: // private static final String SERVER_URL = "http://localhost:8094/data/view/"; private static final String SERVER_URL = "http://www.google.com/calendar/feeds/[email protected]/public/full?alt=json-in-script&callback=insertAgenda&orderby=starttime&max-results=15&singleevents=true&sortorder=ascending&futureevents=true"; private static final String SERVER_ERROR = "An error occurred while " + "attempting to contact the server. Please check your network " + "connection and try again."; /** * This is the entry point method. */ public void onModuleLoad() { JsonpRequestBuilder requestBuilder = new JsonpRequestBuilder(); // requestBuilder.setTimeout(10000); requestBuilder.requestObject(SERVER_URL, new Jazz10RequestCallback()); } class Jazz10RequestCallback implements AsyncCallback<Article> { @Override public void onFailure(Throwable caught) { Window.alert("Failed to send the message: " + caught.getMessage()); } @Override public void onSuccess(Article result) { // TODO Auto-generated method stub Window.alert(result.toString()); } The article class is simply: import com.google.gwt.core.client.JavaScriptObject; public class Article extends JavaScriptObject { protected Article() {}; } The gwt page, however, always hit the onFailure() callback and show this alert: Failed to send the message. Timeout while calling <url>. Fail to see anything on the Eclipse plugin console. I tried the url and it works perfectly. Would appreciate any tip on debugging technique or suggestion

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  • How are you taking advantage of Multicore?

    - by tgamblin
    As someone in the world of HPC who came from the world of enterprise web development, I'm always curious to see how developers back in the "real world" are taking advantage of parallel computing. This is much more relevant now that all chips are going multicore, and it'll be even more relevant when there are thousands of cores on a chip instead of just a few. My questions are: How does this affect your software roadmap? I'm particularly interested in real stories about how multicore is affecting different software domains, so specify what kind of development you do in your answer (e.g. server side, client-side apps, scientific computing, etc). What are you doing with your existing code to take advantage of multicore machines, and what challenges have you faced? Are you using OpenMP, Erlang, Haskell, CUDA, TBB, UPC or something else? What do you plan to do as concurrency levels continue to increase, and how will you deal with hundreds or thousands of cores? If your domain doesn't easily benefit from parallel computation, then explaining why is interesting, too. Finally, I've framed this as a multicore question, but feel free to talk about other types of parallel computing. If you're porting part of your app to use MapReduce, or if MPI on large clusters is the paradigm for you, then definitely mention that, too. Update: If you do answer #5, mention whether you think things will change if there get to be more cores (100, 1000, etc) than you can feed with available memory bandwidth (seeing as how bandwidth is getting smaller and smaller per core). Can you still use the remaining cores for your application?

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  • How to upgrade the project build in visual studio 2005 to visual studio 2008?

    - by Shailesh Jaiswal
    I have one OPC ( OLE for Process control ) server project which is developed into visual studio 2005. I want to run it in visual studio 2008. The coding for the OPC server project is done in VC++. I want to connect my OPC client to this OPC server. When I was opened the OPC server project which was build into visual studio 2005 into visual studio 2008 first time it was asking for conversion wizard. I gone through that wizard & successfully finished that wizard. But when I build ( by right clicking on the project & choosing build solution ) it is giving lots of error near about 64 errors. Most of the errors are like - fetal error C1083:Can not open type library file:'msxml4.dll':No such file or directory, fetal error LINK1181:can not open input file 'rpcndr.lib' , error C2051:case expression not constant. only these 3 types of errors in am getting. All these 3 errors are repeated in Error list & becoming bunch of 64 errors. Please provide me the solution for the above issue. Can you provide me any suusgestion or link or any way through whcih I can resolve the above issue?

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  • Can't Change The Content of a Ajax Control After CallBack

    - by Kubi
    public void RaiseCallbackEvent(String eventArgument) { // Processes a callback event on the server using the event // argument from the client. //Response.Write(eventArgument); printAlternativesFromAirport(eventArgument); } public void printAlternativesFromAirport(string airport) { List<TravelPlan> alternatives = fit.Code.TextDataHelper.GetAllTravelPlansFromCity(airport); AlternativesAcc.Panes.Clear(); AjaxControlToolkit.AccordionPane p = new AjaxControlToolkit.AccordionPane(); Label header = new Label(); header.Text = airport; Label content = new Label(); content.Text = airport; p.HeaderContainer.Controls.Add(header); p.ContentContainer.Controls.Add(content); AlternativesAcc.Panes.Add(p); ... Hi, printAlternativesFromAirport method should change an accordion panel after the callback but it doesn't. Is there anything that i could set to fix this problem ? There should be stg with the page lifecycle but i can't figure it out ! Thanks

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  • How do I use a .NET class in VBA? Syntax help!

    - by Jordan S
    ok I have couple of .NET classes that I want to use in VBA. So I must register them through COM and all that. I think I have the COM registration figured out (finally) but now I need help with the syntax of how to create the objects. Here is some pseudo code showing what I am trying to do. EDIT: Changed Attached Objects to return an ArrayList instead of a List The .NET classes look like this... public class ResourceManagment { public ResourceManagment() { // Default Constructor } public static List<RandomObject> AttachedObjects() { ArrayList list = new ArrayList(); return list; } } public class RandomObject { // public RandomObject(int someParam) { } } OK, so this is what I would like to do in VBA (demonstrated in C#) but I don't know how... public class VBAClass { public void main() { ArrayList myList = ResourceManagment.AttachedObjects(); foreach(RandomObject x in myList) { // Do something with RandomObject x like list them in a Combobox } } } One thing to note is that RandomObject does not have a public default constructor. So I can not create an instance of it like Dim x As New RandomObject. MSDN says that you can not instantiate an object that doesn't have a default constructor through COM but you can still use the object type if it is returned by another method... Types must have a public default constructor to be instantiated through COM. Managed, public types are visible to COM. However, without a public default constructor (a constructor without arguments), COM clients cannot create an instance of the type. COM clients can still use the type if the type is instantiated in another way and the instance is returned to the COM client. You may include overloaded constructors that accept varying arguments for these types. However, constructors that accept arguments may only be called from managed (.NET) code. Added: Here is my attempt in VB: Dim count As Integer count = 0 Dim myObj As New ResourceManagment For Each RandomObject In myObj.AttachedObjects count = count + 1 Next RandomObject

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  • OLAP Web Visualization and Reporting Recommendations

    - by Gok Demir
    I am preparing an offer for a customer. They proide weekly data to different organizations. There is huge amount data suits OLAP that needed to be visualized with charts and pivot tables on web and custom reports will be built by non-it persons (an easy gui). They will enter a date range, location which data columns to be included and generate report and optionally export the data to Excel. They currently prepare reports with MS Excel with Pivot Tables and but they need a better online tool now to show data to their customers. Tables are huge and need of drill-down functionality. My current knowledge Spring, Flex, MySql, Linux. I have some knowledge of PostgreSQL and MSSQL and Windows. What is the easiest way of doing this project. Do you think that SSRP (haven't tried yet) and ASP.NET better suits for this kind of job. Actually I prefer open source solutions. Flex have OLAP Data Grid control which do aggregation on client side. JasperServer seems promising but it seems I need enterprise version (multiple organizations and ad hoc queries). What about Modrian + Flex + PostgreSQL solution? Any previous experience will be appreciated. Yes I am confused with options.

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  • How should I handle persistence in a Java MUD? OptimisticLockException handling

    - by Chase
    I'm re-implementing a old BBS MUD game in Java with permission from the original developers. Currently I'm using Java EE 6 with EJB Session facades for the game logic and JPA for the persistence. A big reason I picked session beans is JTA. I'm more experienced with web apps in which if you get an OptimisticLockException you just catch it and tell the user their data is stale and they need to re-apply/re-submit. Responding with "try again" all the time in a multi-user game would make for a horrible experience. Given that I'd expect several people to be targeting a single monster during a fight I think the chance of an OptimisticLockException would be high. My view code, the part presenting a telnet CLI, is the EJB client. Should I be catching the PersistenceExceptions and TransactionRolledbackLocalExceptions and just retrying? How do you decide when to stop? Should I switch to pessimistic locking? Is persisting after every user command overkill? Should I be loading the entire world in RAM and dumping the state every couple of minutes? Do I make my session facade a EJB 3.1 singleton which would function as a choke point and therefore eliminating the need to do any type of JPA locking? EJB 3.1 singletons function as a multiple reader/single writer design (you annotate the methods as readers and writers). Basically, what is the best design and java persistence API for highly concurrent data changes in an application where it is not acceptable to present resubmit/retry prompts to the user?

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  • Getting error detail from WCF REST

    - by Keith
    I have a REST service consumed by a .Net WCF client. When an error is encountered the REST service returns an HTTP 400 Bad Request with the response body containing JSON serialised details. If I execute the request using Fiddler, Javascript or directly from C# I can easily access the response body when an error occurs. However, I'm using a WCF ChannelFactory with 6 quite complex interfaces. The exception thrown by this proxy is always a ProtocolException, with no useful details. Is there any way to get the response body when I get this error? Update I realise that there are a load of different ways to do this using .Net and that there are other ways to get the error response. They're useful to know but don't answer this question. The REST services we're using will change and when they do the complex interfaces get updated. Using the ChannelFactory with the new interfaces means that we'll get compile time (rather than run time) exceptions and make these a lot easier to maintain and update the code. Is there any way to get the response body for an error HTTP status when using WCF Channels?

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  • Java EE suitablity for a social network using Cassandra datastore ??

    - by Marcos
    We are in the process of making some important technology decisions for a social networking application. We're planning to have Cassandra(a NoSQL database to support efficient data storage). We would be using Hector(a Java client) to interact with Cassandra. 1.) Would Java EE be a good choice over PHP for a social networking application in terms of performance, scalabilty & complexities? 2.) Another possible implementation strategy, Is it suitable to have backend alone in Java and rest in PHP? 3.) What differences(as compared to PHP) it makes in terms of costs at various stages of application development, deployment and maintenance ? 4.) What are the things to keep in mind as we move along with Java development& deployment(as we are relatively new to the Java background) ? 5.) If you could list some major production deployments of similar type(social network) applications in Java. Thank you!

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  • Complex data types in WCF?

    - by Hojou
    I've run into a problem trying to return an object that holds a collection of childobjects that again can hold a collection of grandchild objects. I get an error, 'connection forcibly closed by host'. Is there any way to make this work? I currently have a structure resembling this: pseudo code: Person: IEnumerable<Order> Order: IEnumberable<OrderLine> All three objects have the DataContract attribute and all public properties i want exposed (including the IEnumerable's) have the DataMember attribute. I have multiple OperationContract's on my service and all the methods returning a single object OR an IEnumerable of an object works perfectly. It's only when i try to nest IEnumerable that it turns bad. Also in my client service reference i picked the generic list as my collection type. I just want to emphasize, only one of my operations/methods fail with this error - the rest of them work perfectly. EDIT (more detailed error description): [SocketException (0x2746): An existing connection was forcibly closed by the remote host] [IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.] [WebException: The underlying connection was closed: An unexpected error occurred on a receive.] [CommunicationException: An error occurred while receiving the HTTP response to http://myservice.mydomain.dk/MyService.svc. This could be due to the service endpoint binding not using the HTTP protocol. This could also be due to an HTTP request context being aborted by the server (possibly due to the service shutting down). See server logs for more details.] I tried looking for logs but i can't find any... also i'm using a WSHttpBinding and an http endpoint.

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  • Axis2 attachments are vanishing in the response

    - by Shamik
    I am using axis2 to come up with a basic web service which will get the file name as parameter and produces a response SOAP packet which will have the file attached along with the SOAP. Here is the way I am creating the service code (its simple and inspired by Axis2 sample code) public String getFile(String name) throws IOException { MessageContext msgCtx = MessageContext.getCurrentMessageContext(); File file = new File (name); System.out.println("File = " + name); System.out.println("File exists = " + file.exists()); FileDataSource fileDataSource = new FileDataSource(file); System.out.println("fileDataSource = " + fileDataSource); DataHandler dataHandler = new DataHandler(fileDataSource); System.out.println("DataHandler = " + dataHandler); String attachmentID = msgCtx.addAttachment(dataHandler); System.out.println("attachment ID = " + attachmentID); return attachmentID; } Now The client side code - MessageContext response = mepClient .getMessageContext(WSDLConstants.MESSAGE_LABEL_IN_VALUE); SOAPBody body = response.getEnvelope().getBody(); OMElement element = body.getFirstElement().getFirstChildWithName( new QName("http://service.soapwithattachments.sample","return")); String attachementId = element.getText(); System.out.println("attachment id is " + attachementId); Attachments attachment = response.getAttachmentMap(); DataHandler dataHandler = attachment.getDataHandler(attachementId); Problem is that dataHandler is always null. Though I think at the server side, the file was read and attached along with the SOAP packet. Am I doing something wrong ? EDIT : I have put <parameter name="enableSwA" locked="false">true</parameter> in the axis2.xml file.

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  • Need help troubleshooting why Solr wont start (or why solr admin page wont show)

    - by Camran
    I can't get Solr working. I have Jetty, and my server OS is Ubuntu 9.10. It is a VPS server. So, when I execute the java -jar start.jar everything seems fine. I even do a netstat to check if there are any listeners on the port before the start and after the start, and it seems solr is starting. However, I cant access the admin page. I have even turned off the firewall. Here is some info about my server: I have changed DocumentRoot to var/www/SV/ I have Apache2, PHP5, MySql installed I have "disabled" iptables firewall I have removed the htaccess files (I used them to passw protect my site under develop) I have installed JRE (NOT JDK) on my server. I use the "example" which comes with Solr, so I use Jetty as container on my Server. My Server has 768MB RAM Doing a java -version command shows this: java version "1.6.0_15" Java(TM) SE Runtime Environment (build 1.6.0_15-b03) Java HotSpot(TM) Client VM (build 14.1-b02, mixed mode) And in the terminal the last lines when executing start.jar is: May 29, 2010 1:30:03 PM org.apache.solr.core.SolrCore registerSearcher INFO: [] Registered new searcher Searcher@1dc64a5 main NOTE: Also before this last line, there is a line which makes me suspicious: Started SocketConnector @ 0.0.0.0:8983 // Should this be with leading zeros? Is there any ways you know to troubleshoot this? Memory issue maybe? Thanks

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  • GWT: uiBinder-based widget cant be instanced second time

    - by Konoplianko
    Hi. I created a widget using GWT uiBinder. It works fine, till the moment when I want to instance it second time. After i call constructor second time it returns only raw description from XML and statements in constructor (rootElement.add( new HTML( "panel1" ), leftId );) are just don't work. It throws no error or warning. Please help Java class: public class DashboardLayout extends Composite { final String leftId = "boxLeft"; final String rightId = "boxRight"; interface DashboardLayoutUiBinder extends UiBinder<HTMLPanel, DashboardLayout> { } private static DashboardLayoutUiBinder ourUiBinder = GWT.create( DashboardLayoutUiBinder.class ); @UiField HTMLPanel htmlPanel; public DashboardLayout() { HTMLPanel rootElement = ourUiBinder.createAndBindUi( this ); this.initWidget( rootElement ); rootElement.add( new HTML( "panel1" ), leftId ); rootElement.add( new HTML( "panel2" ), rightId ); } } XML descriprion: <ui:UiBinder xmlns:ui='urn:ui:com.google.gwt.uibinder' xmlns:g='urn:import:com.google.gwt.user.client.ui' > <g:HTMLPanel ui:field="htmlPanel"> <table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="40%" id="boxLeft" class="boxContextLeft"> </td> <td width="60%" id="boxRight" class="boxContextRight"> </td> </tr> </table> </g:HTMLPanel> </ui:UiBinder>

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