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JPA: How to have one-to-many relation of the same Entity type
... is possible. This is a special case of the standard bidirectional @ManyToOne/@OneToMany relationship. It is special because the entity on each end of the relationship is the same. The general case is detailed in Section 2.10.2 of the JPA 2.0 spec.
Here's a worked example. First, the entity cla...
Why doesn't await on Task.WhenAll throw an AggregateException?
...n.
So, in catch block, you get the actual exception and not the aggregated one. This helps us write more natural and intuitive code.
This was also needed for easier conversion of existing code into using async/await where the a lot of code expects specific exceptions and not aggregated exceptions.
-...
Regex to get string between curly braces
Unfortunately, despite having tried to learn regex at least one time a year for as many years as I can remember, I always forget as I use them so infrequently. This year my new year's resolution is to not try and learn regex again - So this year to save me from tears I'll give it to Stack Overflow ...
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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How does a hash table work?
...and easier to search, but still you don't want to search sequentially from one end of the library (or list) to the other.
You want something that, with the title of the book, can give you the right spot at once, so all you have to do is just stroll over to the right shelf, and pick up the book.
Bu...
A definitive guide to API-breaking changes in .NET
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In fact, it can be a source-level break too, if someone tries to create a delegate for bar.
– Pavel Minaev
Sep 24 '09 at 17:17
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Remove items from one list in another
... might give you what you want in your context, however, "Remove items from one list in another" is certainly not equivalent to a set difference operation, and you should not misinform people by accepting this as the right answer!!!!
– user1935724
May 26 '16 at ...
Target elements with multiple classes, within one rule
...ould have elements with multiple classes, and I need to assign them within one rule, so that the same classes could be different within different containers. Say I have this in my CSS:
...
Difference between binary semaphore and mutex
...ex better than a binary semaphore then? Since it doesn't make sense if someone releases a lock which he doesn't actually hold.
– Pacerier
Dec 8 '11 at 16:31
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How do you split and unsplit a window/view in Eclipse IDE?
...Editor>Toggle Split Editor were added with Eclipse Luna 4.4 M4, as mentioned by Lars Vogel in "Split editor implemented in Eclipse M4 Luna"
The split editor is one of the oldest and most upvoted Eclipse bug! Bug 8009
The split editor functionality has been developed in Bug 378298, and will be ava...