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• Testing for undefined and null child objects in ActionsScript/Flex

  - by dbasch

  Hi Everyone, I use this pattern to test for undefined and null values in ActionScript/Flex : if(obj) { execute() } Unfortunately, a ReferenceError is always thrown when I use the pattern to test for child objects : if(obj.child) { execute() } ReferenceError: Error #1069: Property child not found on obj and there is no default value. Why does testing for child objects with if statements throw a ReferenceError? Thanks!

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• ASP.NET MVC Value cannot be null Parameter name: httpContext

  - by Hitesh

  Hi There, I have downloaded Storefront asp.net mvc application. When I try to run the application, I get following exception: ArgumentNullException - Value cannot be null. Parameter name: httpContext I just don't understand it. How do I fix this error? Thanks -Hitesh

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• Spring Security: Authentication returns null

  - by Mike

  Hi! I implemented FilterInvocationSecurityMetadataSource. in getAttribute, i am trying to extract the Authentication object to achieve the user and get his allowed views from the database:Object principal = SecurityContextHolder.getContext().getAuthentication().getPrincipal(); but the authentication is null! why? how can i achieve it?

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• Java WebService call - null parameters

  - by Diana C

  I have a Java WS developed with JAX-WS. This service has only one method with two int parameters as input. Every time I try to call this service the parameters are 0. If I change to type to Integer 0 is transformed in null.

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• Javascript if (j === null) do nothing.

  - by Kyle Sevenoaks

  Hi, I'm using CurvyCorners to make my corners curvy in IE, only thing is that when it reads the CSS it takes all the webkit properties and shows me an alert curvyCorners.alert("No object with ID " + arg + " exists yet.\nCall curvyCorners(settings, obj) when it is created.");. How can I just set this if statement to do nothing? if (j === null) do nothing(); //but in real script Thanks :)

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• ASP.NET MVC Login ReturnUrl always NULL?

  - by aherrick

  Using Forms Authentication in ASP.NET MVC when trying to log back into a site, it puts a ReturnUrl parameter in the query string. My Logon action method accepts a "returnUrl" string. However it seems that returnUrl string is always null, even when it is clearly in the query string. Any thoughts on why this might be the case or a possible fix?

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• Why static fields are not initialized in time?

  - by Tom Brito

  Somebody tell me: class MyClass { private static MyClass myClass = new MyClass(); private static final Object obj = new Object(); public MyClass() { System.out.println(obj); // will print null once } } I wonder, isn't this a bug? Why static objects are not initialized before the constructor runs?

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• SPContext.Current is null in a web service under a sharepoint site

  - by Ariel

  I'm exposing a web service in a SharePoint site e.g. http://server/_vti_bin/subdir/mywebservice.asmx. In the web service method, SPContext.Current appears to be null. (Interestingly, I'm looking at an example in Chapter 5 of Inside Windows SharePoint Services 3.0 and they use SPContext.Current inside a web service!) Any idea what am I missing? Thanks in advance.

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• query " ALTER TABLE test_posts ADD sticky boolean NOT NULL default = false" = error

  - by William

  Whats wrong with my query? ALTER TABLE test_posts ADD sticky boolean NOT NULL default = false #1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '=false' at line 2

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• Java StringTokenizer, empty null tokens

  - by user69514

  I am trying to split a string into 29 tokens..... stringtokenizer won't return null tokens. I tried string.split, but I believe I am doing something wrong: String [] strings = line.split(",", 29); sample inputs: 10150,15:58,23:58,16:00,00:00,15:55,23:55,15:58,00:01,16:03,23:58,,,,,16:00,23:22,15:54,00:03,15:59,23:56,16:05,23:59,15:55,00:01,,,, 10155,,,,,,,,,,,07:30,13:27,07:25,13:45,,,,,,,,,,,07:13,14:37,08:01,15:23 10160,10:00,16:02,09:55,16:03,10:06,15:58,09:48,16:07,09:55,16:00,,,,,09:49,15:38,10:02,16:04,10:00,16:00,09:58,16:01,09:57,15:58,,,,

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• Make the selectedValue in bound combobox accept a Null value

  - by msfanboy

  Hello, I have a combobox bound to a bindingsource. The user must be able to set a null value as selected value. How can I achieve that without making the combobox unbound?

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• Null reference to DataContext when testing an ASP.NET MVC app with NUnit

  - by user252160

  I have an ASP.NET MVC application with a separate project added for tests. I know the plusses and minuses of using the connection to the database when running unit tests, and I still want to use it. Yet, every time when I run the tests with the NUnit tool, they all fail due to my Data Context being null. I heard something about having a separate config file for the tests assembly, but i am not sure whether I did it properly, or whether that works at all.

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• IVsEditorAdaptersFactoryService.CreateVsTextViewAdapter throws an object null reference

  - by Adam Driscoll

  I'm trying to create a IVsTextViewAdpater with the IVsEditorAdaptersFactoryService but when I call CreateVsTextViewAdapter it throws an object null reference: var editorFactory = componentModel.GetService<IVsEditorAdaptersFactoryService>(); var serviceProvider = (Microsoft.VisualStudio.OLE.Interop.IServiceProvider)this; var view = editorFactory.CreateVsTextViewAdapter(serviceProvider); 'this' is a Microsoft.VisualStudio.Shell.Package implementation. Any ideas?

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• HttpServletRequest.getServerName() occasionally returning null in concurrent use?

  - by oconnor0

  Under JBoss 4.0.1SP1, I have a servlet that makes multiple, concurrent calls to web services that are running under the same instance. I'm using request.getServerName() (on HttpServletRequest) to construct the endpoint URL. This normally works fine, but every once in a while returns null. I hadn't seen this before running the web service requests in parallel, and so I guessed that sharing the HttpServletRequest among threads won't always work or something. Any ideas on fixing this?

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• this.loaderInfo is null in Flex

  - by Viliam Husár

  I have a problem with Flex module. I want to access url variables by this.loaderInfo.url, i call a function in createionComplete handler of module and sometimes it works and sometimes it doesn't. (Can't access... null). Any suggestions?

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• ASP.Net Textbox control doesn't return NULL when it is empty

  - by iansinke

  In reference to this question that I just asked, http://stackoverflow.com/questions/2451579/sql-select-all-when-filter-value-is-empty, it appears that for some reason, an empty text box's value is not being fed to SQL Server as NULL, as it ought to be. Any ideas on how to fix this?

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• FastVectorHighlighter.Net returning null on GetBestFragment

  - by Midhat

  Hi I have a large index, on which Highlighter.Net works fine, but FastVectorHighlighter returns null as a Best Fragment on Some documents. the searcher works fine. It is just the highlighter. The field has been indexed in the same manner for all documents, so I fail to understand Why it highlights some documents but not all. Using Lucene.Net 2.9.2, built from trunk rev942061

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• ChildControl of a childcontrol is null when calling from Main control

  - by Jan Schoenrock

  Hello I built a webusercontrol in asp.net which contains a databound dropdown. When I directly put this control into a webform it runs well. But if I try to add this control as childcontrol to another control at runtime Childcontrol childcontrol = new Childcontrol (); maincontrol.controls.add(childcontrol) , the dropdown of the childcontrol is not instatiated (is null) so that I run in an exception by trying to bind the data to the dropdown.

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• groupby not allow include

  - by user276640

  i use such code _dataContext.Invoice.Include("Projects").Where(i => i.Paid == true).GroupBy(i => i.Projects.Id).OrderBy(grouping => grouping.Max(i => i.Projects.Id)).Take(3); but object Projects is null, but another code is working _dataContext.Invoice.Include("Projects").OrderBy(i => i.DateCreated).ToList(); what the problem?

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• NfcAdapter.getDefaultAdapter(this) returns null in emulator

  - by DixieFlatline

  I am trying to test ForegroundDispatch (http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/nfc/ForegroundDispatch.html) in emulator API 10 (Android 2.3.3). When i call NfcAdapter.getDefaultAdapter(this), i get null. Why is this so? Code: public class ForegroundDispatch extends Activity { private NfcAdapter mAdapter; private PendingIntent mPendingIntent; private IntentFilter[] mFilters; private String[][] mTechLists; private TextView mText; private int mCount = 0; @Override public void onCreate(Bundle savedState) { super.onCreate(savedState); setContentView(R.layout.foreground_dispatch); mText = (TextView) findViewById(R.id.text); mText.setText("Scan a tag"); mAdapter = NfcAdapter.getDefaultAdapter(this); // Create a generic PendingIntent that will be deliver to this activity. The NFC stack // will fill in the intent with the details of the discovered tag before delivering to // this activity. mPendingIntent = PendingIntent.getActivity(this, 0, new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0); // Setup an intent filter for all MIME based dispatches IntentFilter ndef = new IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED); try { ndef.addDataType("*/*"); } catch (MalformedMimeTypeException e) { throw new RuntimeException("fail", e); } mFilters = new IntentFilter[] { ndef, }; // Setup a tech list for all NfcF tags mTechLists = new String[][] { new String[] { NfcF.class.getName() } }; } @Override public void onResume() { super.onResume(); mAdapter.enableForegroundDispatch(this, mPendingIntent, mFilters, mTechLists); //CRASHES HERE BECAUSE mAdapter IS NULL } @Override public void onNewIntent(Intent intent) { Log.i("Foreground dispatch", "Discovered tag with intent: " + intent); mText.setText("Discovered tag " + ++mCount + " with intent: " + intent); } @Override public void onPause() { super.onPause(); mAdapter.disableForegroundDispatch(this); } } My manifest: <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.neka.znacka" android:versionCode="1" android:versionName="1.0"> <uses-sdk android:minSdkVersion="10" /> <uses-permission android:name="android.permission.NFC"></uses-permission> <uses-feature android:name="android.hardware.nfc" android:required="true" /> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".Uvodna" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name="Simulator"> </activity> </application> Any ideas?

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• How Should One Print Out a NULL Character without a Space in C

  - by sobbayi

  I have a situation where I have to print out a NULL character if there is no action in a part of my program. Take for example the code below: char x = '\0'; ... printf("@%c@\n", x); I want it to print this: @@ but it prints out @ @ Whats the correct way not to have the \0 character printed out a space as above?

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• Calling class method through NULL class pointer

  - by Adil

  I have following code snippet: class ABC{ public: int a; void print(){cout<<"hello"<<endl;} }; int main(){ ABC *ptr = NULL: ptr->print(); return 0; } It runs successfully. Can someone explain it?

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• PHP session is null when called in other page in safari

  - by steamboy

  Hello guys, I have a session created which is null when called from an ajax call on Safari. header.php session_start(); $_SESSION['test'] = 'this is my session'; mypage.php session_start(); echo $_SESSION['test']; <-- NOT WORKING ON SAFARI Thanks

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• Detecting null/empty input from user

  - by itsaboutcode

  How i can check if user has input null/empty string in classic-asp? Right now i am doing this. If Request.Form("productId") == "" Then 'my code here End If But its not working.

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• Enterprise Library Validation Block - Validate nullable properties?

  - by Robert MacLean

  I am trying to come up with a validation for a nullable property, like int? Example [RangeValidator(0, RangeBoundaryType.Inclusive, 1, RangeBoundaryType.Inclusive)] int? Age { get; set; } However if I set Age to null validation fails because it doesn't fall in the range, I know I need an [ValidatorComposition(CompositionType.Or)] as well, but what else should I use?

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