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• Using DefaultIfEmpty in Linq - problem substituting a null value for a default value

  - by FiveTools

  I have questions that may or may not have a question_group if all the questions do not have a question_group and if I use default if empty like this: question_group defaultQuestion = new question_group {question_group_id = Guid.Empty}; questions.Select(x => x.question_group).DefaultIfEmpty(defaultQuestion).Distinct(); shouldn't I get an IEnumerable<question_group> containing only the default question_group that I defined? I get null.... what am I missing here?

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• Why might NotesSession.GetDatabase() return null?

  - by ssg31415926

  I'm trying to open names.nsf in code. The piece of code has been working for a while but suddenly, I'm getting null. Any idea why? I don't seem to be getting any errors and I don't know how to work out what's wrong. I can open the database from the Notes client on the same machine.

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• Either or has to have a value but both can't be null at the same time

  - by Coppermill

  I have two fields and I need to generate an attribute, using Microsoft Enterprise Library validation, so that either or has to have a value, but both can not be null at the same time.

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• Checking if a record in datareader is NULL

  - by user279521

  I have browsed thru other postings on S/O, but I can't find a solution that works for me. I have a datareader that might return a null value, and if so, I want to value to equal blank txtMiddleName.Text = rdrGetUserInfo.GetString(1) ?? ""; The string above does not work. When I walk thru the code, the code jumps to my error trapping block; Any ideas?

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• How to test input value for null or zero with jQuery

  - by Matt

  I need to keep the focus on the text input when the user moves to the next input without putting something in the previous one. In short, if it is null (left blank) or not valid, how do I keep the focus on that input until the conditions are satisfied?

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• issue with $.ParseJSON which converts json string to null

  - by Aby

  I am using spring mvc in which i convert the arraylist into json string. I have one object 1) results. My output from spring looks like this: { "data":"[{\"userName\":\"test1\",\"firstName\":\"test\",\"lastName\":\"user\"}, {\"userName\":\"test2\",\"firstName\":\"test1\",\"lastName\":\"user1\"}]", } I get output as null when i do '$.parseJSON' with this output. When i tried testing only with data object it works fine Any help would be great.

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• Unable to get value of property 'keyCode': object is null or undefined : Internet Explorer

  - by user1409232

  One of the customers are facing difficulty while logging into our webiste, whenever the user types the first character in UserName text box on the sign in page, he gets below JavaScript error message. Unable to get value of property 'keyCode': object is null or undefined We do check for event.keyCode to validate the userName textbox , so as soon as the user types the first character we send the event.keyCode for validation which is failing. The browser is internet Explorer 9 and we are not able to reproduce the problem in our workstation which has I9

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• Saving Variables In An ASP Page

  - by Or Betzalel

  I'm trying to convert a game I made (WindowsFormApplication) to an ASP Page. My Problem is that I have a lot "private" variables in my WindowFormApplication and those variables are important for the game. But when after I Declare all my variables (in my Page_Load), they turn null no matter what I do(click a button, refresh the page). Is there anyway to save my variables between buttons (other than Session, because I'd have to create like 6 more sessions)

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• Method Overloading for NULL parameter

  - by Phani

  I have added three methods with parameters: public static void doSomething(Object obj) { System.out.println("Object called"); } public static void doSomething(char[] obj) { System.out.println("Array called"); } public static void doSomething(Integer obj) { System.out.println("Array called"); } When I am calling doSomething(null) , then compiler throws error as ambiguous methods. So Is the issue because Integer and char[] methods or Integer and Object methods?

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• C#: DataBase Null in RadioButtonList

  - by Vinzcent

  Hey, I would like to have a radiobuttollist were you can select value null. Something like this: <asp:RadioButtonList ID="rblCD" runat="server" SelectedValue='<%# Bind("tblCD") %>'> <asp:ListItem Value="RW">RW</asp:ListItem> <asp:ListItem Value="R">R</asp:ListItem> <asp:ListItem Value="DBNull">None</asp:ListItem> </asp:RadioButtonList> Thanks a lot, Vincent

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• Can a std::string contain embedded nulls?

  - by WilliamKF

  For regular C strings, a NULL signifies the end of data. What about std::string, can I have a string with embedded NULLS?

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• getView() in CountDownTimer's onTick return sometimes null

  - by HexWrench

  I had recently a crash report where I could see that in the CountDownTimer's onTick method the getView() call returns null. I use the onTick method to display the remaining time in a textView. The textView is inside a Fragment. Since the CountDownTimer runs in the UI thread I have no idea why this had happened. What could be the cause for this and what is a possible workaround for this problem? Thanks!

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• Asp.Net Session is null in ashx file

  - by Amitabh

  If I access session variable in ashx handler through it is always null. How can I access the current user here. public void ProcessRequest (HttpContext context) { context.Session[UIConstants.SessionItems.ID] = Id; }

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• Grails Domain.get() returns null for mongo's ObjectId

  - by Shashank Agrawal

  I'm using grails 2.3.5 with mongodb 3.0.1 and no hibernate installed. I've a domain class which uses mongo's ObjectId. import org.bson.types.ObjectId class Category { ObjectId id String name } And has a record in mongo database: { "_id": ObjectId("53f6c34c33a429240e2ab471"), "name": "art", "version": NumberLong("41") } When I do, Category.get(new ObjectId("53f6c34c33a429240e2ab471")) somewhere in grails app, it returns null but when I do Category.get("53f6c34c33a429240e2ab471") it then actually returns the result. Why, get() method does not process ObjectId type?

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• Can class of linux device be NULL?

  - by Basilevs

  Can I pass NULL pointer to the first argument of device_create function? I'm using device_create() to create character device file in sysfs. This file don't represent any physical device (it is used to provide an access to a set of devices connected to various buses). What class should I use with device_create() to create such a file?

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• null string deserialized to empty string when using protobuf-net

  - by cornerback84

  I am using protobuf-net to serialize and deserialize my messages. My message also contain come strings that can be null. However when I deserialize them on the other side, I get empty strings (""). According to google docs, the default value for string type in empty string. What could be the resolution for this issue?

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• null checking edit textbox android

  - by sara brown

  i want to make empty textbox checking for android. i tried try catch but it was force to close. below is my codes try{ name = (EditText)findViewById(R.id.name); }catch(NullPointerException ex){ new AlertDialog.Builder(KawalanAppXTVT.this).setTitle("Error" ) .setMessage("That's not a number") .setPositiveButton("OK", null).show(); can someone help me?

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• JS Error:Cannot call method of null

  - by Nadeem

  I have the following method in a js file in ASP.Net web project. This method is giving the error Cannot call method 'split' of null function loadUser_InfoCallBack(res) { var ret=res.value; var senderGUID = ret.split(';')[0]; var senderText = ret.split(';')[1]; if(senderGUID.Length>0) { $('hiddenSender.value')=senderGUID; $('hiddenText.value')=senderText; } } Can anybody suggest the reasons for this error..

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• A C# class with a null namespace

  - by Richard Ev

  While going through some legacy code today I discovered that you can declare a C# class without placing it in a namespace (in this scenario I have an ASP.NET WebForms application and some of the web forms are not declared within any namespace). A GetType() on such a class returns a type where the namespace property is set to null. I did not know that this was allowed - can anyone suggest why it would be desirable to have a class that is not declared within a namespace?

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• How to handle null response for json object

  - by user1494754

  I get a JSON response as { "edges": [], "nodes": [] } how to check if the objects has null values and handle the case?? JSONObject jobj = new JSONObject(line); JSONArray jArray = jobj.getJSONArray("edges"); if(jArray.length()!=0) { for(int i=0;i<jArray.length();i++){ JSONObject json_data = jArray.getJSONObject(i); x.add((float) json_data.getInt("x")); y.add((float) json_data.getInt("y")); end This retrurns me : org.json.JSONException: end of input at character 0 of

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• `if (str1 == null)` when throws a NullPointerException

  - by Daziplqa

  In java, Does the following line has a possiblity (even 0.01%) to throw a NullPointerException?? if (str1 == null) Actually I am falling some bug in the code and It says that similar line throws a java.lang.NullPointerException ?!

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• Hibernate SessionFactory getCurrentSession returns null

  - by newbie

  Log file shows that when I start my war, there are no errors. When I try to get Session with SessionFactory it returns null. I'm using SQL Server 2008.

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• Jquery .text() call returns null?

  - by Alex

  Hey all, I'm practicing Jquery and I've written this simple Jquery statement: var someText = $("table tr td").text(); Should this not return all text of td elements found within tr's that are found within tables? How do I fix this? Currently when I run this, it says that table tr td is null, but I have a table on the page I'm testing on. Thanks!

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• Null pointer exception on .iterator() call

  - by Peter

  I'm getting a strange NullPointerException, evidently thrown by the following line of code: Iterator<Note> it = notes.iterator(); I've checked, and at the time the java.util.TreeSet notes is always non-null (with 15 elements). The TreeSet API says nothing about iterator() throwing NullPointerExceptions. What else could be going here?

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• Large memory chunk not garbage collected

  - by Niels

  In a hunt for a memory-leak in my app I chased down a behaviour I can't understand. I allocate a large memory block, but it doesn't get garbage-collected resulting in a OOM, unless I explicit null the reference in onDestroy. In this example I have two almost identical activities that switch between each others. Both have a single button. On pressing the button MainActivity starts OOMActivity and OOMActivity returns by calling finish(). After pressing the buttons a few times, Android throws a OOMException. If i add the the onDestroy to OOMActivity and explicit null the reference to the memory chunk, I can see in the log that the memory is correctly freed. Why doesn't the memory get freed automatically without the nulling? MainActivity: package com.example.oom; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; public class MainActivity extends Activity implements OnClickListener { private int buttonId; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); System.gc(); Button OOMButton = new Button(this); OOMButton.setText("OOM"); buttonId = OOMButton.getId(); setContentView(OOMButton); OOMButton.setOnClickListener(this); } @Override public void onClick(View v) { if (v.getId() == buttonId) { Intent leakIntent = new Intent(this, OOMActivity.class); startActivity(leakIntent); } } } OOMActivity: public class OOMActivity extends Activity implements OnClickListener { private static final int WASTE_SIZE = 20000000; private byte[] waste; private int buttonId; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Button BackButton = new Button(this); BackButton.setText("Back"); buttonId = BackButton.getId(); setContentView(BackButton); BackButton.setOnClickListener(this); waste = new byte[WASTE_SIZE]; } public void onClick(View view) { if (view.getId() == buttonId) { finish(); } } }

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