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Getting a null value,where a value is expected


Getting a null value,where a value is expected

By : Matt Lipy
Date : November 19 2020, 03:59 PM
Any of those help I am trying to create a Login page using JSP.The first Jsp page collects the username and password, when login button is pressed the user is navigated to another JSP page.Here I want to display the username of the user.I wrote a code for it,but I am getting null as the value.Kindly tell me where I have gone wrong.The code is as follows , It looks like you need type="submit" instead of button.
code :


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Null propagation + null coalescing operator not working as expected when dealing with InnerException

Null propagation + null coalescing operator not working as expected when dealing with InnerException


By : Auli18462
Date : November 01 2020, 01:05 PM
this one helps. For a simple console application that I am developing I want to implement a very basic exception handling (just printing the exception message and terminating the program). The logic that I want to implement is: if the exception has an inner exception, print the inner's message; otherwise print the own exceptions's message. , What you are doing now is this:
code :
("--- Error: " + ex.InnerException?.Message) ?? ex.Message
"--- Error: " + (ex.InnerException?.Message ?? ex.Message)
JUnit test case failure: java.lang.AssertionError: expected null, but was:<null>

JUnit test case failure: java.lang.AssertionError: expected null, but was:<null>


By : Will
Date : March 29 2020, 07:55 AM
hope this fix your issue getDataAsString() does not return null because return new ObjectMapper().writeValueAsString(this.data); does not throw an exception, instead it returns a string that says "< null >" and that does not equal to null of course. Instead of only returning null on catching an exception you should return null too if writeValueAsString() returns this custom null type.
Null is returned from a method that is expected to return non-null value (UITableViewCell)

Null is returned from a method that is expected to return non-null value (UITableViewCell)


By : Dhyan
Date : March 29 2020, 07:55 AM
Hope that helps First of all never register cells in cellForRowAtIndexPath. Register your cell (once) in viewDidLoad if necessary at all.
The error occurs because you are only registering a cell but not creating one if cell is nil.
code :
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
     GSDischargeListCell *cell = (GSDischargeListCell *)[tableView dequeueReusableCellWithIdentifier:cellIdentifier forIndexPath: indexPath];

     if (_searchController.active && ... 
}
Moshi: Expected a Class, ParameterizedType, or GenericArrayType, but <null> is of type null

Moshi: Expected a Class, ParameterizedType, or GenericArrayType, but <null> is of type null


By : user7630089
Date : March 29 2020, 07:55 AM
will help you I have this model: , Just need to do this:
code :
class Model1 {
    <... other fields here ...>
    @JvmSuppressWildcards var attributes: Map<String, Any>? = null
    <... other fields here ...>
}
SQL Server Select into variable not null when expected to be null (info)

SQL Server Select into variable not null when expected to be null (info)


By : Markh Cnx
Date : March 29 2020, 07:55 AM
I hope this helps you . As was suggested by a commenter the correct way is to use something like:
code :
SET @field2 = (SELECT field2 FROM test1 WHERE field1 = 'worldhello');
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