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• jQuery slideToggle stay open on hover

  - by durilai

  I have a div that I have bound the jQuery hover event to activate a slideDown using slideToggle: <div class="Square"> <div class="RedSquare"></div> <div class="GraySquare"></div> </div> $("div.RedSquare").hover( function() { $(this).siblings("div.GraySquare").slideToggle("fast"); }, function() { $(this).siblings("div.GraySquare").slideToggle("fast"); } ); It toggles a div '.GraySquare' right below it. Basically making a gray box slide down from the red box. The problem I am facing is that when the mouse moves over the gray div the slide toggles up. I want it to remain down when hovering over the red or gray square. Any help is appreciated.

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• JPA 2.0, hiberante 3.5, jars & persistence.xml location

  - by phmr

  I'm building a desktop application using hibernate 3.5 & JPA 2.0. I have 2 jars, the lib, which defines every entity and DAO, packages looks like this : org.my.package.models org.my.package.models.dao org.my.package.models.utils In org.my.package.utils I defined my hibernate utility class for getting EM & EMF instances, which means the lib is bound to a Persistence Unit name but that's not a problem for now (anyway you can recommend me a better way to manage that) the second jars is built as follow: org.my.package.app META-INF is defined on the root of the project which means in my jar I can find this directories directly in the root: META-INF/ META-INF/persistence.xml org/ org/my/ ... org/my/package/app/Main.class META-INF/ When I run the app, hibernate doesn't managed to find persistence.xml it throws an exception something like "package or class for PersistenceUnitName not found". I googled a bit about the problem but I can't get the source code organisation right. Any help ?

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• How to use role-hierarchy in Spring Security 3 with Spring EL?

  - by Aleksey

  I want to use @PreAuthorize annotation on service methods with Spring Security. One of requirements is to use role-hierarchy. But by default it is not enabled. I found that in SecurityExpressionRoot class ("the base class for expression root objects") there is a property roleHierarchy. The class actually does use this property for methods like hasRole() and hasAnyRole(). I suppose that if I supply it with my own RoleHierarchy bean I will be able to use @PreAuthorize annotations with hierarchical roles. How can I inject my hierarchy bean into SecurityExpressionRoot?

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• Dealing with the lack of closures in Objective-C

  - by Sean Clark Hess

  Maybe it's just the fact that I've been using http://nodejs.org/ lately, but the lack of closures in Objective-C (iphone) has been really hard to work around. For example, I'm creating service classes. Each service class can have several methods, each of which makes a different URL request. I can use the delegate pattern, but that means that I have to create a new service each time I want to call a method on it (because it has to store the delegate and selector for that request, and new method calls would overwrite them). Even more difficult for me is the fact that I can't easily keep local variables around in the scope for a callback. I have to store anything I want to send back to the delegate on the service class itself, which makes it harder to have more than one method on each class. How do you pros do it? Should I just quit whining and do it another way?

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• C# "Enum" Serialization - Deserialization to Static Instance

  - by Walt W

  Suppose you have the following class: class Test : ISerializable { public static Test Instance1 = new Test { Value1 = "Hello" ,Value2 = 86 }; public static Test Instance2 = new Test { Value1 = "World" ,Value2 = 26 }; public String Value1 { get; private set; } public int Value2 { get; private set; } public void GetObjectData(SerializationInfo info, StreamingContext context) { //Serialize an indicator of which instance we are - Currently //I am using the FieldInfo for the static reference. } } I was wondering if it is possible / elegant to deserialize to the static instances of the class? Since the deserialization routines (I'm using BinaryFormatter, though I'd imagine others would be similar) look for a constructor with the same argument list as GetObjectData(), it seems like this can't be done directly . . Which I would presume means that the most elegant solution would be to actually use an enum, and then provide some sort of translation mechanism for turning an enum value into an instance reference. How might one go about this?

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• Heap Dump Root Classes

  - by Adnan Memon

  We have production system going into infinite loop of full gc and memory drops form 8 gigs to like 1 MB in just 2 minutes. After taking heap dump it tells me there an is an array of java.lang.Object ([Ljava.lang.Object) with millions of java.lang.String objects having same String taking 99% of heap. But it doesn't tell me which class is referencing to this array so that I can fix it in the code. I took the heap dump using jmap tool on JDK 6 and used JProfiler, NetBeans, SAP Memory Analyzer and IBM Memory Analyzer but none of those tell me what is causing this huge array of objects?? ... like what class is referencing to it or contains it. Do I have to take a different dump with different config in order to get that info? ... Or anything else that can help me find out the culprit class causing this ... it will help a lot.

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• How to properly match varargs in Mockito

  - by qualidafial

  I've been trying to get to mock a method with vararg parameters using Mockito: interface A { B b(int x, int y, C... c); } A a = mock(A.class); B b = mock(B.class); when(a.b(anyInt(), anyInt(), any(C[].class))).thenReturn(b); assertEquals(b, a.b(1, 2)); This doesn't work, however if I do this instead: when(a.b(anyInt(), anyInt())).thenReturn(b); assertEquals(b, a.b(1, 2)); This works, despite that I have completely omitted the varargs argument when stubbing the method. Any clues?

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• constructor injection using Autofac 2 and Named Registration

  - by Thad

  I am currently attempting to remove a number of .Resolve(s) in our code. I was moving along fine until I ran into a named registration and I have not been able to get Autofac resolve using the name. What am I missing to get the named registration injected into the constructor. Registration builder.RegisterType<CentralDataSessionFactory>().Named<IDataSessionFactory>("central").SingleInstance(); builder.RegisterType<ClientDataSessionFactory>().Named<IDataSessionFactory>("client").SingleInstance(); builder.RegisterType<CentralUnitOfWork>().As<ICentralUnitOfWork>().InstancePerDependency(); builder.RegisterType<ClientUnitOfWork>().As<IClientUnitOfWork>().InstancePerDependency(); Current class public class CentralUnitOfWork : UnitOfWork, ICentralUnitOfWork { protected override ISession CreateSession() { return IoCHelper.Resolve<IDataSessionFactory>("central").CreateSession(); } } Would Like to Have public class CentralUnitOfWork : UnitOfWork, ICentralUnitOfWork { private readonly IDataSessionFactory _factory; public CentralUnitOfWork(IDataSessionFactory factory) { _factory = factory; } protected override ISession CreateSession() { return _factory.CreateSession(); } }

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• Startup Broadcast Receiver Not Running At Startup

  - by comead

  I have a class StartupReceiver: public class StartupReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { Intent service = new Intent(context, ARMRService.class); context.startService(service); } and it is declared in my Manifest.xml as <receiver android:name=".StartupReceiver"> <intent-filter> <action android:name="android.intent.action.BOOT_COMPLETED" /> </intent-filter> </receiver> and I have given the correct permission: <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" /> Why is this not working???

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• Undo "Upgrade Current Target for iPad?

  - by Moshe

  I've upgraded current Target for iPad and I dodn't like the result. Now, i've tried to downgrade by deleting files but it's not working. Help! Do I need to change project settings? Does XCode keep a backup of the project? What to do... It doesn't run on iPhone anymore... EDIT: The console crash log on the iPhone Simulator: 2010-05-10 00:11:02.455 iDecide[9743:207] Unknown class iDecideAppDelegate in Interface Builder file. 2010-05-10 00:11:02.456 iDecide[9743:207] Unknown class iDecideViewController in Interface Builder file. 2010-05-10 00:11:02.465 iDecide[9743:207] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UICustomObject 0x391eb80> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key viewController.' 2010-05-10 00:11:02.466 iDecide[9743:207] Stack: ( 34047067, 2420679945, 34206145, 215656, 214197, 4551796, 33949999, 4546347, 4554615, 2715730, 2754518, 2743092, 2725503, 2752609, 39038297, 33831808, 33827912, 2719253, 2756527 )

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• Protected Members of Other Instances in Scala

  - by Masterofpsi

  I just ran into a difficulty while learning Scala. I have an inheritance hierarchy that is essentially equivalent to this: class A { protected def myMethod() = println("myMethod() from A") } class B extends A { def invokeMyMethod(a: A) = a.myMethod() } But trying to compile this sample, I get the error "test.scala:7: error: method myMethod cannot be accessed in A". Coming from Java, my understanding is that protected members should be accessible at any point from a derived class, and nowhere have I seen anything that tells me that protected members in Scala are limited by instance. Does anyone have an explanation for this?

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• Installing gtk+ themes on Windows

  - by srisar

  How do I download a gtk+ theme and install it on a computer running Windows? I know that I can select a few of the themes from the theme selector, but not sure how I install one.

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• Efficient counting of an association’s association

  - by Matthew Robertson

  In my app, when a User makes a Comment in a Post, Notifications are generated that marks that comment as unread. class Notification < ActiveRecord::Base belongs_to :user belongs_to :post belongs_to :comment class User < ActiveRecord::Base has_many :notifications class Post < ActiveRecord::Base has_many :notifications I’m making an index page that lists all the posts for a user and the notification count for each post for just that user. # posts controller @posts = Post.where( :user_id => current_user.id ) .includes(:notifications) # posts view @posts.each do |post| <%= post.notifications.count %> This doesn’t work because it counts notifications for all users. What’s an efficient way to do this without running a separate query for each post?

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• Spring MVC defaultValue for Double

  - by mlathe

  Hi All, I'm trying to build a controller like this: @RequestMapping(method = {RequestMethod.GET}, value = "/users/detail/activities.do") public View foo(@RequestParam(value = "userCash", defaultValue="0.0") Double userCash) { System.out.println("foo userCash=" + userCash); } This works fine: http://localhost/app/users/detail/activities.do?userCash=123& but in this one userCash==null despite the default value http://localhost/app/users/detail/activities.do?userCash=& From some digging it seems like the first one works b/c of a Editor binding like this: binder.registerCustomEditor(Double.class, new CustomNumberEditor(Double.class, false)); The trouble is that the second param (ie false) defines whether blank values are allowed. If i set that to true, than the system considers the blank input as valid so i get a null Double class. If i set it to false then the system chokes on the blank input string with: org.springframework.beans.TypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'double'; nested exception is java.lang.NumberFormatException: empty String Does anyone know how to get the defaultValue to work for Doubles? Thanks --Matthias

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• forloop and table in latex

  - by Tim

  Hi, Here is the latex code for my table: \begin{table}{| c || c | c | c || c | c | c | } \caption{Examples of the concepts. \label{tab:conceptsimgs}}\\ \hline \backslashbox{Concept}{Class} &\multicolumn{3}{|c||}{Negative Class} & \multicolumn{3}{|c|}{Positive Class} \\ \hline \forloop{themenumber}{1}{\value{themenumber} < 4}{ %\hline \arabic{themenumber} \forloop{classnumber}{0}{\value{classnumber} < 2}{ \forloop{imagenumber}{1}{\value{imagenumber} < 4}{ & 0 } } \\ \hline } \end{table} Something is wrong in the result however. There is some extra thing at the end of the table, as shown in this image. How can I fix it? Thanks and regards!

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• Entity Relationship diagram - Composition

  - by GigaPr

  Hi, I am implementing a small database(university Project) and i am facing the following problem. I created a class diagram where i have a class Train {Id, Name, Details} And a class RollingStock which is than generalized in Locomotive and FreightWagon. A train is Composed by multiple RollingStock at a certain time(on different days the rolling stock will compose a different train). I represented the relationship train - rolling stock as a diamond filled (UML) but still I have a many to many relationship between the two tables. so i guess i have to create an additional table to solve the many to many relationship train_RollingStock. but how do i represent the Composition? Can i still use the filled diamond? If yes on which side? Thanks

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• C# inheritance XmlSerializer

  - by ikurtz

  greetngs, i have two classes: [Serializable] public class FireGridUnit { public GridUnit FireGridLocation { get; set; } } [Serializable] public class FireResult: FireGridUnit { public bool Hit { get; set; } public bool ShipDestroyed { get; set; } public Ship.ValidShips DestroyedShipType {get; set;} public bool Win { get; set; } } as you see FireResult inherits FireGrdUnit. in my code when i try to use them i get a runtime error: Unable to cast object of type 'NietzscheBattleships.FireGridUnit' to type 'NietzscheBattleships.FireResult'. is this because if i am serializing the class has to be independant ie not be inherited? many thanks.

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• Covariance and Contravariance on the same type argument

  - by William Edmondson

  The C# spec states that an argument type cannot be both covariant and contravariant at the same time. This is apparent when creating a covariant or contravariant interface you decorate your type parameters with "out" or "in" respectively. There is not option that allows both at the same time ("outin"). Is this limitation simply a language specific constraint or are there deeper, more fundamental reasons based in category theory that would make you not want your type to be both covariant and contravariant? Edit: My understanding was that arrays were actually both covariant and contravariant. public class Pet{} public class Cat : Pet{} public class Siamese : Cat{} Cat[] cats = new Cat[10]; Pet[] pets = new Pet[10]; Siamese[] siameseCats = new Siamese[10]; //Cat array is covariant pets = cats; //Cat array is also contravariant since it accepts conversions from wider types cats = siameseCats;

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• DataAnnotations multiple property validation in MVC

  - by scottrakes

  I am struggling with DataAnnotations in MVC. I would like to validate a specific property, not the entire class but need to pass in another property value to validate against. I can't figure out how to pass the other property's value, ScheduleFlag, to the SignUpType Validation Attribute. public class Event { public bool ScheduleFlag {get;set;} [SignupType(ScheduleFlag=ScheduleFlag)] } public class SignupTypeAttribute : ValidationAttribute { public bool ScheduleFlag { get; set; } public override bool IsValid(object value) { var DonationFlag = (bool)value; if (DonationFlag == false && ScheduleFlag == false) return false; return true; } }

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• Django Managers

  - by owca

  I have the following models code : from django.db import models from categories.models import Category class MusicManager(models.Manager): def get_query_set(self): return super(MusicManager, self).get_query_set().filter(category='Music') def count_music(self): return self.all().count() class SportManager(models.Manager): def get_query_set(self): return super(MusicManager, self).get_query_set().filter(category='Sport') class Event(models.Model): title = models.CharField(max_length=120) category = models.ForeignKey(Category) objects = models.Manager() music = MusicManager() sport = SportManager() Now by registering MusicManager() and SportManager() I am able to call Event.music.all() and Event.sport.all() queries. But how can I create Event.music.count() ? Should I call self.all() in count_music() function of MusicManager to query only on elements with 'Music' category or do I still need to filter through them in search for category first ?

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• Good Async pattern for sequential WebClient requests

  - by Omar Shahine

  Most of the code I've written in .NET to make REST calls have been synchronous. Since Silverlight on Windows Phone only supports Async WebClient and HttpWebRequest calls, I was wondering what a good async pattern is for a Class that exposes methods that make REST calls. For example, I have an app that needs to do the following. Login and get token Using token from #1, get a list of albums Using token from #1 get a list of categories etc my class exposes a few methods: Login() GetAlbums() GetCategories() since each method needs to call WebClient using Async calls what I need to do is essentially block calling Login till it returns so that I can call GetAlbums(). What is a good way to go about this in my class that exposes those methods?

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• Google App Engine (python): TemplateSyntaxError: 'for' statements with five words should end in 'rev

  - by Phil

  This is using the web app framework, not Django. The following template code is giving me an TemplateSyntaxError: 'for' statements with five words should end in 'reversed' error when I try to render a dictionary. I don't understand what's causing this error. Could somebody shed some light on it for me? {% for code, name in charts.items %} <option value="{{code}}">{{name}}</option> {% endfor %} I'm rendering it using the following: class GenerateChart(basewebview): def get(self): values = {"datepicker":True} values["charts"] = {"p3": "3D Pie Chart", "p": "Segmented Pied Chart"} self.render_page("generatechart.html", values) class basewebview(webapp.RequestHandler): ''' Base class for all webapp.RequestHandler type classes ''' def render_page(self, filename, template_values=dict()): filename = "%s/%s" % (_template_dir, filename) path = os.path.join(os.path.dirname(__file__), filename) self.response.out.write(template.render(path, template_values))

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• C# WinForms problem with draw image

  - by Paul

  Hi I have this class: class OriginalImage: Form { private Image image; private PictureBox pb; public OriginalImage() { pb = new PictureBox {SizeMode = PictureBoxSizeMode.CenterImage}; pb.SizeMode = PictureBoxSizeMode.StretchImage; Controls.Add(pb); image = Image.FromFile(@"Image/original.jpg"); this.Width = image.Width; this.Height = image.Height; this.Text = "Original image"; this.Paint += new PaintEventHandler(Drawer); } public virtual void Drawer(object source, PaintEventArgs e) { Graphics g = pb.CreateGraphics(); g.DrawImage(image,0,0); } I call this create object OriginalImage in other form on button click, but image is not draw? Where is problem? public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { var oi = new OriginalImage(); oi.Show(); } }

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• Custom array sorting based on instance properties

  - by St. John Johnson

  I'm trying to perform a usort on an array inside an instance of a class. But the sort is dependent on the properties of said instance. Code (which doesn't work): class foo { private $array; private $key; private $dir; function sort() { usort($this->array, array("foo", "orderArray")); } function orderArray($a, $b) { return strcmp($a[$this->key], $b[$this->key]) * $this->dir; } } From the orderArray class, you can't access $key or $dir. The question is, how can I write this so I can?

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• Javassist: how to create proxy of proxy?

  - by Bozho

  I'm creating proxies with javassist ProxyFactory. When creating a single proxy all works fine. However, when I pass a proxied class to the proxying mechanism, it fails with javassist.bytecode.DuplicateMemberException: duplicate method: setHandler in com.mypackage.Bean_$$_javassist_0_$$_javassist_1 I'm creating the proxies with this: public Object createProxiedInstance(Object originalInstance) throws Exception { Class<?> originalClass = instance.getClass(); ProxyFactory factory = new ProxyFactory(); factory.setSuperclass(originalClass); factory.setHandler(new MethodHandler() {..}); Class<T> proxyClass = factory.createClass(); return proxyClass.newInstance(); } So, how do I create proxies of proxies? Update: The actual problems is that each proxy implements the ProxyObject which defines setHandler(..) method. So the 2nd proxy is trying to redefine the method, instead of overriding it in the subclass.

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