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Difference between ProcessBuilder and Runtime.exec()
I'm trying to execute an external command from java code, but there's a difference I've noticed between Runtime.getRuntime().exec(...) and new ProcessBuilder(...).start() .
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Why doesn't the example compile, aka how does (co-, contra-, and in-) variance work?
...ed in the presence of mutable data. This is why generics are invariant in Java. Brief example of unsoundness using Java arrays (which are erroneously covariant):
Object[] arr = new Integer[1];
arr[0] = "Hello, there!";
We just assigned a value of type String to an array of type Integer[]. For ...
Is it a bad practice to catch Throwable?
... a Error/Throwable if I don't catch it? I didn't see anything in the logs. Java EE app. Just spent days stuck not knowing what the problem was until I added this catch.
– Philip Rego
Nov 26 '18 at 19:47
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Android ACTION_IMAGE_CAPTURE Intent
...lolipop: ava.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.net.Uri.getScheme()' on a null object reference
– Igor Janković
Aug 16 '16 at 13:56
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How many constructor arguments is too many?
...has been passed an illegal or inappropriate argument." see docs.oracle.com/javase/7/docs/api/java/lang/…)
– Grmpfhmbl
May 4 '17 at 13:27
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How to add reference to a method parameter in javadoc?
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As far as I can tell after reading the docs for javadoc there is no such feature.
Don't use <code>foo</code> as recommended in other answers; you can use {@code foo}. This is especially good to know when you refer to a generic type such as {@code Iterator<...
“Invalid signature file” when attempting to run a .jar
My java program is packaged in a jar file and makes use of an external jar library, bouncy castle . My code compiles fine, but running the jar leads to the following error:
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Can I exclude some concrete urls from inside ?
...ollowin error; Uncaught exception thrown by filter Static Resource Filter: java.io.FileNotFoundException. Any idea why ?
– shamaleyte
Jun 29 '15 at 16:48
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Why is char[] preferred over String for passwords?
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To quote an official document, the Java Cryptography Architecture guide says this about char[] vs. String passwords (about password-based encryption, but this is more generally about passwords of course):
It would seem logical to collect and store the pass...
When to use an assertion and when to use an exception
... where it doesn't matter at all if someone turns them off. (Note that the java command turns off all assertions by default.)
Use regular tests for any kind of checks what shouldn't be turned off. This includes defensive checks that guard against potential damage cause by bugs, and any validation d...