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What does it mean: The serializable class does not declare a static final serialVersionUID field? [d

I have the warning message given in the title. I would like to understand and remove it. I found already some answers on this question but I do not understand these answers because of an overload with technical terms. Is it possible to explain this issue with simple words? ...
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How to detect when an Android app goes to the background and come back to the foreground

I am trying to write an app that does something specific when it is brought back to the foreground after some amount of time. Is there a way to detect when an app is sent to the background or brought to the foreground? ...
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Default constructor with empty brackets

Is there any good reason that an empty set of round brackets (parentheses) isn't valid for calling the default constructor in C++? ...
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What is the purpose of the : (colon) GNU Bash builtin?

What is the purpose of a command that does nothing, being little more than a comment leader, but is actually a shell builtin in and of itself? ...
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Multiple Models in a single django ModelForm?

Is it possible to have multiple models included in a single ModelForm in django? I am trying to create a profile edit form. So I need to include some fields from the User model and the UserProfile model. Currently I am using 2 forms like this ...
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What is the most accurate way to retrieve a user's correct IP address in PHP?

I know there are a plethora of $_SERVER variables headers available for IP address retrieval. I was wondering if there is a general consensus as to how to most accurately retrieve a user's real IP address (well knowing no method is perfect) using said variables? ...
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What is PostgreSQL explain telling me exactly?

MySQL's explain output is pretty straightforward. PostgreSQL's is a little more complicated. I haven't been able to find a good resource that explains it either. ...
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How can I do test setup using the testing package in Go

How can I do overall test setup processing which sets the stage for all the tests when using the testing package ? 6 Answe...
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How can I check for Python version in a program that uses new language features?

If I have a Python script that requires at least a particular version of Python, what is the correct way to fail gracefully when an earlier version of Python is used to launch the script? ...
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How can I get a resource “Folder” from inside my jar File?

I have a resources folder/package in the root of my project, I "don't" want to load a certain File. If I wanted to load a certain File, I would use class.getResourceAsStream and I would be fine!! What I actually want to do is to load a "Folder" within the resources folder, loop on the Files inside t...