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Why generate long serialVersionUID instead of a simple 1L?
... or generated serialVersionUID(3567653491060394677L) . I think that first one is cooler, but many times I saw people using the second option. Is there any reason to generate long serialVersionUID ?
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JPA eager fetch does not join
... and lazy. In both cases JPA/Hibernate does not automatically join many-to-one relationships.
8 Answers
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Git undo changes in some files [duplicate]
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There are three basic ways to do this depending on what you have done with the changes to the file A. If you have not yet added the changes to the index or committed them, then you just want to use the checkout command - this will change the state of the working copy to match the repository...
How to debug a single thread in Visual Studio?
...l break-points in different projects. I want to trace the first thread hit one of these break-points and continue tracing that single thread despite of other threads entering the same code-blocks.
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What is “export default” in javascript?
...en export default is used, this is much simpler. Script files just exports one thing.
cube.js
export default function cube(x) {
return x * x * x;
};
and used as
App.js
import Cube from 'cube';
console.log(Cube(3)); // 27
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Mongoose and multiple database in single node.js project
I'm doing a Node.js project that contains sub projects. One sub project will have one Mongodb database and Mongoose will be use for wrapping and querying db. But the problem is
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Role-based access control (RBAC) vs. Claims-based access control (CBAC) in ASP.NET MVC
...o can do what. You can assign 'CanCreateCustomer' permission (claim) to anyone you like and only permitted user will be able to create customer and permitted user will be able to create only customer and nothing else (unless you assign other permissions to the same user).
This security model offer...
Why are arrays covariant but generics are invariant?
...possible to call these functions on an array of exactly the type Object[]. One could not, for example, shuffle an array of strings.
Therefore, both Java and C# treat array types covariantly. For instance, in C# string[] is a subtype of object[], and in Java String[] is a subtype of Object[].
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Recommended way to get hostname in Java
... in DNS can have many aliases called CNAMEs. These can only be resolved in one direction properly: name to address. The reverse direction is ambiguous. Which one is the "official" name?
A host can have many different IP addresses - and each address can have many different names. Two common cases are...
Insert a commit before the root commit in Git?
... newroot $commit
You can of course rearrange the whole procedure into a one-liner if you know your shell well enough.
Without plumbing
With regular porcelain commands, you cannot create an empty commit without checking out the newroot branch and updating the index and working copy repeatedly, f...