Tech Notes @ Fernvale

Generic DAO

singchyun — Tue, 23 Nov 2010 10:01:36 +0000

This is based on Generic Data Access Objects on Hibernate forums. I modified it for JPA.
import java.lang.reflect.ParameterizedType; import javax.persistence.EntityManager;


public abstract class GenericDAOImpl {

private Class persistentClass;

protected EntityManager em;
@SuppressWarnings("unchecked")

public GenericDAOImpl(EntityManager emgr) {

this.persistentClass = (Class) ((ParameterizedType) getClass()

.getGenericSuperclass()).getActualTypeArguments()[0];

this.em = emgr;

}
public T findById(ID id) {

T entity = em.find(persistentClass, id);

return entity;

}
public void create(T entity) {

em.persist(entity);

}
public void update(T entity) {

em.merge(entity);

}

public void remove(T entity) { em.remove(entity); } }

Source of info: http://community.jboss.org/wiki/GenericDataAccessObjects#The_DAO_interfaces

Making Vista faster

singchyun — Thu, 19 Mar 2009 03:43:47 +0000

Some handy tips on improving Vista’s performance. Get rid of bloat.

http://www.techsupportalert.com/make-vista-run-faster.htm

Starting JavaDB for Sun Portal Server

singchyun — Thu, 20 Nov 2008 04:59:26 +0000

Starting/stopping JavaDB:

/usr/jdk/entsys-j2se/bin/java -classpath /opt/SUNWjavadb/lib/derby.jar:/opt/SUNWjavadb/lib/derbytools.jar:/opt/SUNWjavadb/lib/derbynet.jar -Dderby.system.home=/var/opt/SUNWportal/derby org.apache.derby.drda.NetworkServerControl

The process will be connected to the terminal from which it was started. To leave it running in the background, use the nohup command.

References: http://docs.sun.com/app/docs/doc/819-5025/6n74td5jt?a=view

Adding new disk to Solaris 10 on VMWare

singchyun — Wed, 19 Nov 2008 13:36:27 +0000

A wonderful and thorough guide on adding new disks to Solaris 10 on VMWare:

http://blogs.sun.com/harcey/entry/solaris_x86_vmware_adding_a

Adding swap space in Solaris

singchyun — Wed, 19 Nov 2008 13:26:46 +0000

When desperate for more swap space in Solaris, this will add more swap space temporarily until the next reboot:

mkfile 512m /path/to/new/swap/file

swap -a /path/to/new/swap/file

Verify the new swap space:

swap -l

References: http://www.tech-recipes.com/rx/163/add-swap-space-temporarily-in-solaris/

Changing Solaris host name and domain name

singchyun — Tue, 18 Nov 2008 16:37:48 +0000

References: http://pantsblazing.com/geek/get_solaris_online.html

In addition, edit /etc/defaultdomain

After the above is done, restart network services: svcadm restart network/physical

ufsdump and ufsrestore

singchyun — Tue, 04 Nov 2008 14:24:55 +0000

ufsdump 0f /path/to/mydumpfile /export/home/mystuffs-to-be-backup/
ufsrestore fr mydumpfile (this will dump the contents in the current working directory)

Optimal HTML width: 960 pixels

singchyun — Tue, 07 Oct 2008 12:53:18 +0000

Assuming a screen resolution of 1024px, what should be the optimal HTML page width?

Cameron Moll shares an interesting concept: a 960-pixel page width. One of the reasons is due to 960 being divisible by 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 32, 40, 48, 60, 64, 80, 96, 120, 160, 192, 240, 320, 480, and 960. It sure offers a lot of grid possibilities.

Small little icons

singchyun — Thu, 18 Sep 2008 09:51:06 +0000

Needing small little utility icons for your applications? Find them all here at: http://www.famfamfam.com/lab/icons/silk/: Seven hundred 16-by-16 pixel icons to tickle your fancy.

Develop a full application using CakePHP

singchyun — Thu, 28 Aug 2008 17:34:48 +0000

James Fairhurst has come up with an excellent series of postings on how to build a full application using CakePHP. It is a wonderful tutorial for newbies who are starting on CakePHP. Thanks James!

Follow the whole series here: http://www.jamesfairhurst.co.uk/tags/view/cakephp/