Presentation for the September 15, 2009 Atlanta Java Users Group meeting.

1. jRecruiter
The AJUG Job Posting Service
Gunnar Hillert
1

2. About Myself
1998-2002 CS at Univ. of Applied Sciences (HTW)
Berlin, Germany
2002 Thesis
2002-2005 Business Integration Consultant
2005-today Mostly web application development
Struts 1, Spring MVC, Struts 2, GWT
2

3. Sometimes I don’t code...
but rather enjoy red clay and humidity
3

4. About jRecruiter
Google Code: http://code.google.com/p/jrecruiter/
CI: http://74.207.227.71:9080/hudson/job/jRecruiter/
Website: http://www.jrecruiter.org/
AJUG Job Posting Site: http://www.ajug.org/jrecruiter/
4

5. History
2005 jRecruiter 1.0 (Struts 1, Hibernate)
2006 jRecruiter 1.2 (Design changes, validation)
2009 jRecruiter 2.0 (Struts 2.1, Spring 3.0, JPA
(Hibernate))
5

6. Changes
Heavy Use of Annotations (Spring 2.5+)
Google Maps Integration
Hibernate Search
RSS
Better Security
Flex Integration Example
6

7. Maven 2
jRecruiter uses Maven 2
3 Modules
jrecruiter-server
jrecruiter-web
jrecruiter-flex
7

8. AppFuse
If you develop Java web-applications, it’s a must-know!
http://www.appfuse.org
Developed by Matt Raible - www.raibledesigns.com
jRecruiter is loosely based on AppFuse
8

9. Spring 2.5/3.0
Use annotations to reduce XML clutter
@Autowired - eliminate getters/setters
<tx:annotation-driven/>
<context:annotation-config />
<context:component-scan base-package="org.jrecruiter.dao.jpa" />
<context:component-scan base-package="org.jrecruiter.service.impl" />
9

10. Spring Tips
If using @Autowired and no setters - How to unit-test?
org.springframework.test.util.ReflectionTestUtils
Allows for setting private instance variables
EasyMock is awesome
10

11. Table Pluralization I
What about rails-like table pluralization?
You could do: @Table(name="users")
Better: Hibernate Naming Strategy
org.hibernate.cfg.DefaultNamingStrategy
org.hibernate.cfg.ImprovedNamingStrategy
11

12. Table Pluralization II
How to do pluralization?
inflector project (http://inflector.dev.java.net)
e.g. String cats = Noun.pluralOf(“cat”)
jRecruiter: ImprovedPluralizedNamingStrategy
12

13. Data Migration
How to deal with external services referencing jobs?
Primary key ids may change across data migrations
Solution: UUID for Job postings
How to map old urls to the new one?
Solution: urlrewriter (http://tuckey.org/urlrewrite/)
13

14. Lorem Ipsum
Generate an arbitrary number of job postings
Fill them with Dummy Data aka ‘place holder text’
http://en.wikipedia.org/wiki/Lorem_ipsum
Library for Java: http://loremipsum.sourceforge.net/
14

15. Struts 2.1
Annotation-driven configuration
Using Convention Plugin (Bundled with Struts 2.1)
VERY similar to Spring MVC 3.0
Which one is better?
15

16. I18N part I
support for German (80% complete)
support for Spanish is planned
Advice: UTF-8 for everything!
Java properties files are a bit ‘iffy’
16

17. I18N part II
by default Java properties files are in ISO-8859-1
UTF-8 characters need to be escaped - ugly!
Java 6 has better support: ResourceBundle.Control
ResourceBundle bundle =
ResourceBundle.getBundle("messages", new
MyControl());
17

18. I18N part III
Spring: ReloadableResourceBundleMessageSource
<bean id="messageSource"
class="org.springframework.context.support.ReloadableResourceBundleMessageSource" >
<property name="basenames" >
<list>
<value>classpath:messages</value>
</list>
</property>
<property name="defaultEncoding" value="utf-8"/>
<property name="cacheSeconds" value="0"/>
</bean>
Spring JSP message tag can use it
Good plugin for eclipse: Eclipse ResourceBundle Editor
http://sourceforge.net/projects/eclipse-rbe/
18

19. Security in jRecruiter
SSL for all administrative pages
Account verification at signup (Email)
User Login: Email + Password
Under the covers: Email OR Username + Password
19

20. Jasypt
http://www.jasypt.org/
http://www.jasypt.org/howtoencryptuserpasswords.html
<bean id="stringDigester" class="org.jasypt.digest.StandardStringDigester" >
<property name="algorithm" value="SHA-512" />
<property name="iterations" value="100000" />
<property name="saltSizeBytes" value="16" />
</bean>
<bean id="passwordEncoder" class="org.jasypt.spring.security2.PasswordEncoder">
<property name="stringDigester">
<ref bean="stringDigester" />
</property>
</bean>
20

21. reCATPCHA
http://recaptcha.net/
Ensure a human is filling
out the form
APIs for many languages
Java, Ruby, Python, .Net…
Recaptcha4j (http://code.google.com/p/recaptcha/)
21

22. Google Maps
jRecruiter uses:
Maps Api (Version 2)
Maps Api for Flash
Static Maps API
Be careful with SSL!
http://code.google.com/p/gmaps-api-issues/issues/detail?id=591
22

23. Google Maps for PDF
Using Static Maps API
Server makes call
Image embedded using iText
23

24. Twitter and bit.ly
Twitter4J (http://yusuke.homeip.net/twitter4j/
java-twitter (http://code.google.com/p/java-twitter/)
Jtwitter (http://www.winterwell.com/software/
jtwitter.php)
jRecruiter uses Twitter4J:
final Twitter twitter = new Twitter(“my_username”, “my password”);
try {
twitter.updateStatus(“tweet”);
} catch (TwitterException e) { …}
24

25. bit.ly
similar to TinyUrl, just cooler
there is a Java library available bitlyj
http://code.google.com/p/bitlyj/
bitlyj works okay but needs some work
final Bitly bitly = BitlyFactory.newInstance(“username”, “password”);
try {
final BitlyUrl bUrl = bitly.shorten(“http://www.google.com/”);
return bUrl.getShortUrl();
} catch (final IOException e) { … }
25

26. Managing API Keys
Dealing with one API key is easy, but many?
Google Maps, Twitter, bit.ly, reCAPTCHA ...
Centrally stored in jrecruiter.properties
org.jrecruiter.common.ApiKeysHolder
Spring-injected
26

27. RSS Feed Support
Provide the latest 20 Job postings as Feed
ROME
https://rome.dev.java.net/
Struts2 integration with s2-rome
http://code.google.com/p/s2-rome/
27

28. Web Services (Indeed.com)
Used JDOM at first, yet memory intensive
StAX - Streaming API for XML
Stream XML data to client
Advantage: Lower Memory Footprint
Part of Java 6
28

29. YSlow
80% of the end-user response time is spent on the
front-end.
Reduce HTTP requests, GZIP, Minify …
http://developer.yahoo.com/yslow/
http://developer.yahoo.com/performance/rules.html
29

30. Jawr
https://jawr.dev.java.net/
Bundling
Minification
GZipping
DWR Integration
JMX Support
30

31. Flex
Spring BlazeDS Integration
http://www.springsource.org/spring-flex
http://coenraets.org (Christophe Coenraets)
SWFObject 2 - Easier Flex Embedding
http://code.google.com/p/swfobject/
31

32. flexmojos
http://flexmojos.sonatype.org/
Build Flex projects with Maven
Now part of Sonatype
32

33. ¿Questions?
Feature requests/issues/feedback
gunnar@hillert.com
http://blog.hillert.com
Slides available at:
http://www.slideshare.net/hillert/jrecruiter-the-ajug-job-posting-service
33