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Creation timestamp and last update timestamp with Hibernate and MySQL
...me with this elegant solution, create the following abstract class
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.MappedSuperclass;
import javax.persistence.PrePersist;
import javax.persistence.PreUpdate;
import javax.persistence.Temporal;
import javax.persistence...
Add object to ArrayList at specified index
... insert nulls between your size and the element you want to add.
import java.util.ArrayList;
public class ArrayListAnySize<E> extends ArrayList<E>{
@Override
public void add(int index, E element){
if(index >= 0 && index <= size()){
super.add...
How to add an extra source directory for maven to compile and include in the build jar?
In addition to the src/main/java, I am adding a src/bootstrap directory that I want to include in my build process, in other words, I want maven to compile and include the sources there in my build. How!?
...
Easy way to convert Iterable to Collection
...ly we would see some of these common patterns integrated directly into the Java runtime libraries.
– Jonathan Neufeld
Nov 3 '15 at 20:01
...
Immutable class?
How can one make a Java class immutable, what is the need of immutability and is there any advantage to using this?
13 Answ...
Random shuffling of an array
...e function yourself, using for example the Fisher–Yates shuffle:
import java.util.*;
import java.util.concurrent.ThreadLocalRandom;
class Test
{
public static void main(String args[])
{
int[] solutionArray = { 1, 2, 3, 4, 5, 6, 16, 15, 14, 13, 12, 11 };
shuffleArray(solutionArray);
...
Reintegrate can only be used if revisions X through Y were previously merged from to reintegra
... the
reintegrate source, but this is not the case:
trunk/proj/src/main/java/com/foo/furniture.java
Missing ranges: /trunk/proj/src/main/java/com/foo/furniture.java:18765-18920
To find the files with mergeinfo information you can do:
cd ~/svn/branches/2.7
svn propget -R svn:mergeinfo .
Then ...
How can we print line numbers to the log in java
... seen are slow. You are better off using a logging framework like that in java.util.logging package or log4j. Using these packages you can configure your logging information to include context down to the class name. Then each log message would be unique enough to know where it came from. As a r...
How to make a Java class that implements one interface with two generic types?
...
I'll say it: This is a flaw with Java. There's absolutely no reason we shouldn't be allowed to have multiple implementations of the same interface, provided that the implementations take different arguments.
– gromit190
...
Is asynchronous jdbc call possible?
...creating millions of actors on a standard JVM setup.
If you're targeting Java, Akka Framework is an Actor model implementation that has a good API both for Java and Scala.
Aside from that, the synchronous nature of JDBC makes perfect sense to me. The cost of a database session is far higher tha...