Most voted "null" questions
In computer programming, null is a special value for a pointer (or any other type of reference) that indicates that this pointer intentionally does not refer to an object (null pointer)
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viewsProblem extracting token from incoming request header in Spring boot. Httpservletrequest.getHeader("Authorization") == null;
I made a CRUD API using Spring boot and used authentication and authorization in this CRUD with JWT (JSON web token). I have a tokenFilter class in my API which is responsible for validating tokens…
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viewsIntent Kotlin receiving null value
I have the following Intent of an Activity: val intent = Intent(this, FormCadastroUsuario::class.java) intent.putExtra("email", email) startActivity(intent) And to receive in another Activity, I…
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viewsJava script: get the element by ID says it is NULL
I am learning to code in javascript and I made a small code to sum two numbers. I put the result to be overwritten on top of "result", but this is not done. When using the chorme element inspect it…
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viewsWEB API POST returns NULL
I am starting my studies with REST API and following an Internet tutorial I developed this API : Class : namespace SimpleRESTServer.Models { public class Person { public long ID { get; set; } public…
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viewsProcedure does not update table with NULL value
Hello, I have a little problem. I need my file to update a value that is inside a column in the table "Cashshopdata", at the moment my code is this way. UPDATE CashShopData SET WCoinC=WCoinC+50…
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viewsHow to group by column only when it is not null (Oracle)?
The query is summarized to facilitate: SELECT nome,idade,profissao,cidade, bairro, estado, pais FROM objeto group by nome,idade,profissao,cidade, bairro, estado, pais; However 3 columns can come…
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viewsModal passing data null
When saving to my modal the Controller receives Null. 1 - Modal model @model WebAutenticado.Models.CAD_DEVP @{ Layout = "~/Views/Shared/_LayoutModal.cshtml"; } @using (Html.BeginForm()) {…
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viewsHow to check null fields in sql?
The Trigger I have to do: A user can only classify an offer if he has purchased it (reservation with estado = pago). On the other hand one of the two attributes classification and comment has to be…
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viewsTerminate program with enter/ EOF
I need the code to end after an empty enter, with no input or the 'EOF', but I don’t know how to apply it and I didn’t understand very well the examples I saw. The program is almost complete, it…
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viewsNull array in a constructor (java)
The purpose of the code is to pass a arraylist of Sessao for the builders sala2D and 3D(in the constructor, the name of the arraylistof Sessao is "Session"). But after some tests it is found that…
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viewsWeb Scraping with Pandas - How to treat values that are null in the collection and how to concatenate two columns in the final result?
I’m making a Web Scrap using Python and Pandas, on Windows. I am collecting the data from the page, generating a Dataframe in Pandas and then exporting to an Excel spreadsheet. I’m not using any…
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viewsReturn Null Print Java
I’m developing an exercise where I need to create a class Ponto and add to an Array of points without me using ArrayList, when testing the first option in the menu I received a return that the array…