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Jackson how to transform JsonNode to ArrayNode without casting?
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In Java 8 you can do it like this:
import java.util.*;
import java.util.stream.*;
List<JsonNode> datasets = StreamSupport
.stream(datasets.get("datasets").spliterator(), false)
.collect(Collectors.toList())
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Java - JPA - @Version annotation
...ink bigint instead of an integer should be used in db type to match a long java type.
– Dmitry
Feb 1 '17 at 17:03
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Is it OK to use == on enums in Java?
Is it OK to use == on enums in Java, or do I need to use .equals() ? In my testing, == always works, but I'm not sure if I'm guaranteed of that. In particular, there is no .clone() method on an enum, so I don't know if it is possible to get an enum for which .equals() would return a diffe...
“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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Eclipse JPA Project Change Event Handler (waiting)
...I ended up finding out that this seems to be a known bug in DALI (Eclipse Java Persistence Tools) since at least eclipse 3.8 which could cause the save action in the java editor to be extremly slow.
Since this hasn't been fully resolved in Kepler (20130614-0229) yet and because I don't need JPT/DA...
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;
}...
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
11
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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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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...