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What does JVM flag CMSClassUnloadingEnabled actually do?

I cannot for the life of me find a definition of what the Java VM flag CMSClassUnloadingEnabled actually does, other than some very fuzzy high-level definitions such as "gets rid of your PermGen problems" ( which it doesn't , btw). ...
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What does (angle brackets) mean in Java?

... <T> is a generic and can usually be read as "of type T". It depends on the type to the left of the <> what it actually means. I don't know what a Pool or PoolFactory is, but you also mention ArrayList<T>, which is a standard Java cla...
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Synchronously waiting for an async operation, and why does Wait() freeze the program here

...ng for the entire task to complete, you have a deadlock. Moving the async call to Task.Run() solves the issue. Because the async call is now running on a thread pool thread, it doesn't try to come back to the UI thread, and everything therefore works. Alternatively, you could call StartAsTask().Co...
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How do I use the new computeIfAbsent function?

...the message creating a value for "snoop" exactly once as on the second invocation of computeIfAbsent there is already a value for that key. The k in the lambda expression k -> f(k) is just a placeolder (parameter) for the key which the map will pass to your lambda for computing the value. So in t...
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Add a dependency in Maven

...e an internal repository, and you're just trying to add your JAR to your local repository, you can install it as follows, using any arbitrary groupId/artifactIds: mvn install:install-file -DgroupId=com.stackoverflow... -DartifactId=yourartifactid... -Dversion=1.0 -Dpackaging=jar -Dfile=/path/to/jarf...
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Overriding Binding in Guice

I've just started playing with Guice, and a use-case I can think of is that in a test I just want to override a single binding. I think I'd like to use the rest of the production level bindings to ensure everything is setup correctly and to avoid duplication. ...
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MySQL 'create schema' and 'create database' - Is there any difference

... answered Aug 2 '09 at 20:09 Pascal MARTINPascal MARTIN 366k6767 gold badges624624 silver badges641641 bronze badges ...
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How is “int* ptr = int()” value initialization not illegal?

...his stays the same in C++11, though there is now also a nullptr, which you can use instead of 0 or NULL in new code. – Jerry Coffin Nov 9 '11 at 23:02 2 ...
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Returning from a finally block in Java

... Sure. I guess I'm asking in case someone can give me some really compelling example on the side of good. – Matt Sheppard Sep 7 '08 at 3:23 ...
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What do the crossed style properties in Google Chrome devtools mean?

...yle was applied, but then overridden by a more specific selector, a more local rule, or by a later property within the same rule. (Special cases: a style will also be shown as struck-through if a style exists in an matching rule but is commented out, or if you've manually disabled it by unchecking...