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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...
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...
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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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();
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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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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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Abstract class in Java
What is an "abstract class" in Java?
14 Answers
14
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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...