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Spring vs EJB. Can Spring replace EJB? [closed]
...n to support the EJB standard can, in theory, be ported from one compliant Java EE app server to another. But that means staying away from any and all vendor-specific extensions that lock you in to one vendor.
Spring ports easily between app servers (e.g., WebLogic, Tomcat, JBOSS, etc.) because it...
How do I use a custom Serializer with Jackson?
I have two Java classes that I want to serialize to JSON using Jackson:
11 Answers
11
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Deleting an object in java?
.... Runtime.getRuntime().gc(). More Info:he garbage collection routines that Java provides are members of the Runtime class. The Runtime class is a special class that has a single object (a Singleton) for each main program. The Runtime object provides a mechanism for communicating directly with the vi...
Java: PrintStream to String?
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Use a ByteArrayOutputStream as a buffer:
import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.nio.charset.StandardCharsets;
final ByteArrayOutputStream baos = new ByteArrayOutputStream();
final String utf8 = StandardCharsets.UTF_8.name();
...
How to use Comparator in Java to sort
....format("{name=%s, age=%d}", name, age);
}
}
EDIT
And an equivalent Java 8 demo would look like this:
public class ComparatorDemo {
public static void main(String[] args) {
List<Person> people = Arrays.asList(
new Person("Joe", 24),
new Pers...
How do I clone a generic List in Java?
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docs.oracle.com/javase/8/docs/api/java/util/… Doesn't work because the list sizes are different.
– MLProgrammer-CiM
Mar 30 '16 at 17:59
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Abstract class in Java
What is an "abstract class" in Java?
14 Answers
14
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Why is super.super.method(); not allowed in Java?
...e cases, perhaps you could overcome inor's objection with dynamic proxies (javahowto.blogspot.co.uk/2011/12/…), redirecting method calls to the original object (synchronizing variables after each call)? It seems that proxies require everything to be implementing an interface, though. Also, I won...
Is there anything like .NET's NotImplementedException in Java?
Is there anything like .NET's NotImplementedException in Java?
5 Answers
5
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PermGen elimination in JDK 8
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Fixed size at startup – difficult to tune.
Internal Hotspot types were Java objects : Could move with full GC, opaque, not strongly typed and hard to debug, needed meta-metadata.
Simplify full collections : Special iterators for metadata for each collector
Want to deallocate class data concurren...