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“java.lang.OutOfMemoryError : unable to create new native Thread”
We are getting "java.lang.OutOfMemoryError : unable to create new native Thread " on 8GB RAM VM after 32k threads (ps -eLF| grep -c java)
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Java executors: how to be notified, without blocking, when a task completes?
... submit these to ExecutorService. Or, see below for a mechanism built into Java 8.
class CallbackTask implements Runnable {
private final Runnable task;
private final Callback callback;
CallbackTask(Runnable task, Callback callback) {
this.task = task;
this.callback = callback;
}...
enum.values() - is an order of returned enums deterministic
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The Java language specification uses this explicit language:
@return an array containing the constants of this enum type, in the order they're declared [Source]
So, yes, they will be returned in declaration order. It's wort...
Should one call .close() on HttpServletResponse.getOutputStream()/.getWriter()?
In Java Servlets, one can access the response body via response.getOutputStream() or response.getWriter() . Should one call .close() on this OutputStream after it has been written to?
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What are the differences between PMD and FindBugs?
...of problems. Use both. These tools taught me a lot about how to write good Java code.
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Is SecureRandom thread safe?
...port seems to indicate that its lack of documentation as thread safe is a javadoc issue. Has anyone confirmed that it is in fact thread safe?
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How do I calculate someone's age in Java?
I want to return an age in years as an int in a Java method.
What I have now is the following where getBirthDate() returns a Date object (with the birth date ;-)):
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Calculating days between two dates with Java
I want a Java program that calculates days between two dates.
11 Answers
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Why doesn't C++ have a garbage collector?
...nherent incompatibility between threading/forking and garbage collection. Java and C# both have high performance preemptive multithreading and and a garbage collector. There are issues to do with realtime applications and a garbage collector, as most garbage collectors have to stop the world to ru...
What does Maven Update Project do in Eclipse?
...m. If you for example change important plugin settings, such as the output java version, you will find that Eclipse will ask you to update the project and afterwards the configured Java runtime in the project will have changed to reflect what your Maven pom indicates.
That is an important thing to ...