Previously, the serialization/deserialization methods used the type Item: public class Item{} Now I have a new class called ItemWrapper derived from Item with an additional property: public cla...

I would like to create a code which is Python 2.7-3.6 compatible I am trying to fix a problem with the csv module where initially I used outfile=open('./test.csv','wb') in Python 2.7 now I have to ...

I am writing a library that makes extensive use of threading and would likely benefit from virtual threads in Java 21+. However, the library must also work for earlier versions of Java (possibly ba...

This is a follow-up-question to Is there an annotation that denotes a max Android API version? Is there an Android annotation that produces a compiler error if neither @RequiresApi(xxx) nor @Requir...

The annotation @RequiresApi is helpful for requiring that the annotated element is only called on the given API level or higher. However, there does not appear to be a corresponding annotation for ...

I'd like to be able to create a function like: class A { private String extraVar; public String myFormat(String format, Object ... args){ return String.format(format, extraVar, args); } } Th...

Can I simply replace log4j-core-2.x (e.g. 2.8.2) with 2.17.1 without breaking backward compatibility? In other words, is Log4j project following Semantic Versioning? Log4J official changelog does n...

StringIO is the file-like string buffer object we use when reading pandas dataframe from text, e.g. "How to create a Pandas DataFrame from a string?" Which of these two imports should we use for S...

According to the answers in this question, std::vector<bool> implements "special" logic (to allow each boolean value to be stored in a single bit, rather than taking up an entire by...

I'm creating a simple image editor app and therefore need to load and save image files. I'd like the saved files to appear in the gallery in a separate album. From Android API 28 to 29, there have ...

I'm having difficulty deciding whether to build a new ruby gem in ruby 3.0.1 vs ruby 2.7. Is ruby code written in versions >=3.0.0 backwards compatible with versions >=2.5 or >=2.7? Can so...

I'm working on a mobile phone web app and I have several text fields that could benefit from <input type="tel"/>. iPhones will adjust the keyboard for the user, but I'm worried about breaking...

I need to make my code backwards compatible with python2.6 and BeautifulSoup 3. My code was written using python2.7 and at this case using BS4. But when I try to run it at squeezy server, I get thi...

While testing if my php script is php-8 compatible, I got stuck on the following code: function getDir($a, $o = 2) { $d = Floor($a / $o); return ($d % 2 === 0); } Prior to php-8, this worked fin...

This question, as you may have inferred from the title, is really two questions in one. First Question: Must I use HTTP/2.0 to send Apple Push Notifications? On the APNs Provider API documentatio...

I am working on a project with minSdkVersion set to 25 (aka Android 7.1). Since this version is quite high, there are a lot of methods I can use without worrying about backward compatibility. For e...

I have a doubt as to whether java is backward compatible or forward compatible? Also, can we run java bytecode written in JDK 11 Windows on a MAC which has JDK 8 without any complications? I'...

Is there a recommended way to introduce restructurings/renamings into an externalized configuration while keeping backwards compatibility for consumers still relying on the old configuration struct...

I do most of my programming in Python 3.x on Windows 7, but now I need to use the Python Imaging Library (PIL), ImageMagick, and wxPython, all of which require Python 2.x. Can I have both Py...

We're developing a modern JS library which uses the ES6 syntax heavily and doesn't support IE11. However we have a small number of users who want to use our library on IE11-compatible sites and we ...

I'm migrating a C++ Visual Studio Project from VS2017 to VS2019. I'm getting an error now, that didn't occur before, that can be reproduced with these few lines of code: struct Foo { Foo() = def...

The following piece of code works fine on my local system but threw compile error on an online platform. #include <iostream> int32_t time[int32_t(1e5)]; int main() { int32_t n; std::cin&g...

My app that currently depends on Postgres and Django's Postgres-only JSONField. The field works well and I've no interest in another project, but I have prospective-users who want to use my app, bu...

I often need to target Mac OS X versions that are older than the one I'm currently running. As I prefer to work with a bash shell and Makefiles, I do not use Xcode. Apple explicitly supports target...

In my company, we're using Spring Boot to implement backend API and React to implement frontend including Web interface and Android/iOS apps. Since our product is an Enterprise software, customers...