null

Use Java exceptions internally for REST API user errors?

We have a REST API that works great. We're refactoring and deciding how to internally handle errors by the users of our API. For example the user needs to specify the "movie" url parameter which should take the value of "1984", "Crash", or "Avatar". First we check to see if it has a valid value. What would be the best approach if the...

"Cannot read property 'xxx' of null"

I've got a document fragment with children that I want to loop over (when possible). This is causing an error "Cannot read property 'xxx' of null". How do I test if this will be the case? ...

List with non-null elements ends up containing null. A synchronization issue?

Hi. First of all, sorry about the title -- I couldn't figure out one that was short and clear enough. Here's the issue: I have a list List<MyClass> list to which I always add newly-created instances of MyClass, like this: list.Add(new MyClass()). I don't add elements any other way. However, then I iterate over the list with foreach and...

Internal Java code best practice for dealing with invalid REST API parameters

My colleague wrote the following stackoverflow question: other stack overflow question on this topic The question seems to have been misinterpreted and I want to find out the answer, so I'm starting this new question... hopefully a little more clear. Basically, we have a REST API. Users of our API call our methods with parameters. Bu...

ssrs: one static row matrix, multiple columns will not filter out nulls

Using a ssrs 2005 matrix client side. I want to list the multiple addresses of one person, hence one row, multiple columns. The Column field is =Fields!StreetName.Value. The data details field is =First(Fields!StreetPrefix.Value) & " " & First(Fields!StreetName.Value). The datasource has a row for each address; however, some rows will ha...

linq null parameter

how can i do the code static string BuildMenu(List<Menu> menu, int? parentId) { foreach (var item in menu.Where(i => i.ParentMenu == parentId || i.ParentMenu.MenuId == parentId).ToList()) { } } return BuildMenu(menuList,null); so if parentId==null then return only records i =>...

C++ standard: dereferencing NULL pointer to get a reference?

I'm wondering about what the C++ standard says about code like this: int* ptr = NULL; int& ref = *ptr; int* ptr2 = &ref; In practice the result is that ptr2 is NULL but I'm wondering, is this just an implementation detail or is this well defined in the standard? Under different circumstances a dereferencing of a NULL pointer should re...

How can I write a null ASCII character (nul) to a file with a Windows batch script?

I'm attempting to write an ASCII null character (nul) to a file from a Windows batch script without success. I initially tried using echo like this: echo <Alt+2+5+6> which seems like it should work (typing <Alt+2+5+6> in the command window does write a null character - or ^@ as it appears), but echo then outputs: More? and hangs un...

SQL SERVER SSAS: How do I handle a NULL date value in my fact table, so I can process my time dimension without errors?

Hello! I have a fact table that has a column with dates loaded from an MS Access source. The thing is, some of the values are NULL and the SSAS won't let me refer my DATE dimension to it. Is it better to solve it at the SSIS stage or is there some solution at the SSAS? Thank you very much for you help. ...

ASP.NET: Why is my JavaScript object set to null?

I have a <script> that contains this line: var tbl = document.getElementById("<%= this.tblSelection.ClientID %>"); ... but tbl always ends up being set to null. The table is declared like this: <asp:Table ID="tblSelection" runat="server" CellPadding="2" CellSpacing="0" cols="1" style="position: absolute; top: 0%; right: 0%"> ...

Blanks causing problem while fetching rows (Informix)

The always interesting issue of NULL Vs Blank is driving me bit crazy now. I have two ESQL/C structures that represent two tables. I'm fetching a row from one table in a cursor. Using the values of two fields from this fetch, I will retrieve a row from another table. I know before hand the second fetch will definitely return one row. N...

Problem evaluating NULL in an IIF statement (Access)

Item in the recordset rstImportData("Flat Size") is = Null With that, given the following statement: IIF(IsNull(rstImportData("Flat Size")), Null, cstr(rstImportData("Flat Size"))) Result: Throws error 94: Invalid use of Null If I change the statement by removing the type conversion upon a false comparison: IIF(IsNull(rstImportData(...

I've got a ComboBox that's giving me grief in WPF using the MVVM pattern

Here's my code: <ComboBox Grid.Column="1" Grid.Row="9" ItemsSource="{Binding Path=PriorityEntries}" SelectedItem="{Binding Path=Priority,Mode=TwoWay}"/> The comboBox is bound properly with PriorityEntries, and when i change the value of the comboBox the "set" of the bound property(Priority) is called setting it to what it needs to be....

Java: prebuild flag to check pars not NULLs?

Currently, I use a very conservative way to stop malfunctioing code. It is annoying at the time of a change when I have to change the checker parts as well. if(ds==null||s==null||maxDs==null) { System.out.println("NULL in getDirs(ds[],s,maxDs)"); System.exit(9); ...

How to check if a BOOL is null?

Is there a way I can check to see if a value is NULL/Nil before assigning it to a BOOL? For example, I have a value in a NSDictionary that can be either TRUE/FALSE/NULL mySTUser.current_user_following = [[results objectForKey:@"current_user_following"]boolValue]; When the value is NULL I get the following error *** Terminating app ...

JQuery.ajax success function returns empty

I have a very basic AJAX function in JQuery: $.ajax({ url: "http://www.google.com", dataType: "html", success: function(data) { alert(data); } }); But the data is always an empty string, no matter what url I go to... Why is that? I am running this locally at http://localhost:3000, and am using JQuery 1.4.2. ...

MySQL Query Browser How do I enter NULL ?

Stupid question: In SQL, I know I can do UPDATE TableA SET MyColumn=NULL But, how do I enter NULL into a cell graphically? I tried entering 'null' and 'NULL' and '' (nothing/empty string) into the MySQL Query Browser with no success. ...

hibernate empty collection in component

I have a component mapped using Hibernate. If all fields in the component in the database are null, the component itself is set to null by hibernate. This is the expected behavior and also what I need. The problem I have, is that when I add a bag to that component, the bag is initialized to an empty list. This means the component has a ...

Cannot pass null to server using jQuery AJAX. Value received at the server is the string "null".

I am converting a javascript/php/ajax application to use jQuery to ensure compatibility with browsers other than Firefox. I am having trouble passing true, false, and null values using jQuery's ajax function. Javascript code: $.ajax ( { url : <server_url>, dataType: 'json', type : 'POST', success : re...

It is good programming practice to always check for null pointers before using an object in C++?

This seems like a lot of work; to check for null each time an object is used. I have been advised that it is a good idea to check for null pointers so you don't have to spend time looking for where segmentation faults occur. Just wondering what the community here thinks? ...