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Do I need elements in persistence.xml?
...m the Java EE 5 tutorial:
<persistence>
<persistence-unit name="OrderManagement">
<description>This unit manages orders and customers.
It does not rely on any vendor-specific features and can
therefore be deployed to any persistence provider.
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Test whether a glob has any matches in bash
...for the existence of a single file, I can test for it using test -e filename or [ -e filename ] .
19 Answers
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How to sort by two fields in Java?
I have array of objects person (int age; String name;) .
16 Answers
16
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Java 8 stream's .min() and .max(): why does this compile?
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Let me explain what is happening here, because it isn't obvious!
First, Stream.max() accepts an instance of Comparator so that items in the stream can be compared against each other to find the minimum or maximum, in some optima...
How do I fix a NoSuchMethodError?
I'm getting a NoSuchMethodError error when running my Java program. What's wrong and how do I fix it?
28 Answers
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What does the variable $this mean in PHP?
I see the variable $this in PHP all the time and I have no idea what it's used for. I've never personally used it.
10 An...
Get Maven artifact version at runtime
...y given library/class.
You can simply use getClass().getPackage().getImplementationVersion() to get the version information that is stored in a .jar-files MANIFEST.MF. Luckily Maven is smart enough Unfortunately Maven does not write the correct information to the manifest as well by default!
Inste...
ssh remote host identification has changed
I've reinstalled my server and I am getting these messages:
28 Answers
28
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lenses, fclabels, data-accessor - which library for structure access and mutation is better
... am aware of providing lenses.
The notion of a lens is that it provides something isomorphic to
data Lens a b = Lens (a -> b) (b -> a -> a)
providing two functions: a getter, and a setter
get (Lens g _) = g
put (Lens _ s) = s
subject to three laws:
First, that if you put something,...
Is there any way to specify a suggested filename when using data: URI?
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Use the download attribute:
<a download='FileName' href='your_url'>
Live example on html5-demos.appspot.com/....
The download attribute works on Chrome, Firefox, Edge, Opera, desktop Safari 10+, iOS Safari 13+, and not IE11.
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