Recent Notes
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Created by Fang on May 03, 2012 15:07:17
Last update: May 03, 2012 15:07:52
Scaling an image with default Java API loses quality (horribly!):
public static BufferedImage resizeImage(Buffer...
The imgscalr library does the job beautifully. And its' very easy to do:
// import org.imgscalr.Scalr;
public static...
To import the library in Maven:
<dependency>
<groupId>org.imgscalr</groupId>
...
Created by magnum on July 26, 2010 15:55:41
Last update: March 28, 2012 15:28:02
Given the URL:
http://www.mydomain.com/myWebApp/theServlet/p1/p2/p3;sid=123?param=abc
This would be the output of the various method calls on HttpServletRequest :
String scheme = request.getScheme(); // ...
Created by James on February 02, 2012 09:31:03
Last update: February 02, 2012 09:31:03
This is an example that adds a validation rule to jQuery validation:
// add a custom method
$.validator.addMethod("m...
Created by Fang on December 06, 2011 19:03:25
Last update: December 07, 2011 08:54:11
Our custom tag, as implemented in the previous note , is broken when a template is used.
Create a template file ( home-template.xhtml ):
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Stric...
and a test page that uses it ( home.xhtml ):
<?xml version="1.0" encoding="UTF-8"?>
<ui:comp...
Then request the page with URL: http://localhost:8080/facelet-demo/home.jsf?name=Jack .
You'll find that our hello tag works inside ui:repeat but fails to get the value defined by ui:param ! What's the problem? Our hello tag implementation evaluated the EL with the wrong EL context!
This is the corrected implementation:
package com.example;
import java.io.IOExcep...
Created by James on November 27, 2011 12:43:24
Last update: November 27, 2011 12:59:01
An easy to digest stylesheet example for XSLT for Atom. Simply list entry titles and summary:
<?xml version="1.0" encoding="utf-8"?>
<xsl:sty...
To show the first 3 items in atom feed:
<?xml version="1.0" encoding="utf-8"?>
<xsl:sty...
Created by James on November 23, 2011 13:57:51
Last update: November 23, 2011 13:57:51
An easy to digest stylesheet example for XSLT for RSS. Simply list item titles descriptions:
<?xml version="1.0" encoding="utf-8"?>
<xsl:sty...
URL for Google news feed: http://news.google.com/news?ned=us&topic=h&output=rss
Created by Fang on November 10, 2011 09:26:12
Last update: November 10, 2011 09:26:12
Syntax highlighted XML schema for JSF 2.0 Application Configuration Resource File ( faces-config.xml ). Almost 3000 lines!
<?xml version="1.0" encoding="UTF-8"?>
<xsd:sch...
Created by Fang on September 07, 2009 20:44:15
Last update: November 03, 2011 14:43:19
Step 1: Repackage a web app as EAR A Java EE application is a multimodule Maven project. At the very least you'll need to package a WAR and an EAR. To get started, I'll simply re-package the simple webapp as an EAR. Create a directory named javaee-app Copy the webapp from here to javaee-app . Rename struts1app to webapp . Create pom.xml under javaee-app :
<project> <modelVersion>4.0.0</modelVersion>... Create a directory named ear under javaee-app . Create pom.xml under ear : <project> <modelVersion>4.0.0</modelVersion>... Modify pom.xml in the webapp directory so that it looks like this: <project> <modelVersion>4.0.0</modelVersion> ... Build with " mvn package " in the javaee-app directory. You can see that ear-1.0.ear is successfully generated in javaee-app/ear/target . Maven successfully resolves dependencies between the sub-projects....
Created by alfa on June 02, 2011 15:26:37
Last update: June 02, 2011 15:26:37
While doing some Java reflection code, I noticed the method Class.isSynthetic() , which the JavaDoc says returns " true if and only if this class is a synthetic class as defined by the Java Language Specification". However, there's no definition of "synthetic class" in the JLS ! The only thing that I can find that remotely resembles a definition is in the JVM spec , where it defines the synthetic attribute : "The Synthetic attribute is a fixed-length attribute in the attributes table of ClassFile (§4.1), field_info (§4.5), and method_info (§4.6) structures. A class member that does not appear in the source code must be marked using a Synthetic attribute." By this definition, a default constructor, which does not appear in the source code, should...
Created by alfa on June 02, 2011 13:04:18
Last update: June 02, 2011 13:04:18
Some javap usage examples.
Start from HelloWorld.java :
@Deprecated
public class HelloWorld {
pu...
javap -c HelloWorld outputs:
Compiled from "HelloWorld.java"
public class He...
javap -v HelloWorld outputs ( -v for verbose mode):
Compiled from "HelloWorld.java"
public class He...
The output consists of:
" Compiled from... " header
Class attributes. For the HelloWorld example, there are two: SourceFile and Deprecated .
Minor and major class file version
Constant pool
Disassembled code
LineNumberTable for debugging purposes.
javap by default only prints package/protected/public members. To display all members including private, use the -p switch.
javap -v -p HelloWorld
