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Created by Fang on October 31, 2011 21:10:10
Last update: October 31, 2011 21:13:10
In this example I'll add a parameter to a facelets template. The example contains three tabs, each tab points to a different page. The tab control is shared among all pages, therefore, it is put in the template.
Starting from the simple facelet example , make these additions:
Create a new template WEB-INF/templates/tabs.xhtml :
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Stric...
Add a page for the about tab ( about.xhtml ):
<?xml version="1.0" encoding="UTF-8"?>
<ui:comp...
Add a page for the news tab ( news.xhtml ):
<?xml version="1.0" encoding="UTF-8"?>
<ui:comp...
Add a page for the partner tab ( partner.xhtml ):
<?xml version="1.0" encoding="UTF-8"?>
<ui:comp...
Build and re-deploy the application. Launch the browser and load page http://localhost:8080/facelet-demo/about.jsf .
This is a screenshot:
Created by Fang on March 03, 2010 05:16:40
Last update: October 31, 2011 10:22:51
Implicit variables are always available to JSTL - you don't need to set them before using them. Page context: pageContext pageContext properties: Name Type Description page javax.servlet.Servlet The current servlet request request javax.servlet.ServletRequest The current servlet request response javax.servlet.ServletResponse The current servlet response servletConfig javax.servlet.ServletConfig The servlet config servletContext javax.servlet.ServletContext The application session javax.servlet.http.HttpSession The current HTTP session Note: request , response etc., is not directly available, you access them with pageContext.request , pageContext.response , etc. Scope variables: pageScope, requestScope, sessionScope, applicationScope Name Type Description pageScope java.util.Map Name-value pair of page scoped variables requestScope java.util.Map Name-value pair of request scoped variables sessionScope java.util.Map Name-value pair of session scoped variables applicationScope java.util.Map Name-value pair of application scoped variables Parameters, HTTP headers and cookies: param, paramValues, header,...
Created by Fang on October 30, 2011 20:35:17
Last update: October 30, 2011 20:37:03
This note lists some of the different behaviors I found using different JSF implementations. In the simple JSF facelet example, I used Sun's reference implementation version 2.0.0-RC:
<dependency> <groupId>javax.faces</gro... With this version, the DOCTYPE declaration is dropped when the page is rendered. It doesn't matter what DOCTYPE you declare in your templates, the facelet engine simply drops it. The problem with this is, your page is always displayed in quirks mode , despite your intentions to require standards compliant mode. The DOCTYPE problem is fixed in release 2.0.2-FCS . Change the dependency in pom.xml to: <dependency> <groupId>javax.faces</gro... and test again, you'll find that DOCTYPE is faithfully passed over to the browser (view source at browser). You can delete the DOCTYPE declaration in the xhtml template...
Created by Fang on October 28, 2011 13:49:40
Last update: October 30, 2011 19:23:25
This is a simple example to demonstrate the templating power of JSF facelets. If you've used struts tiles before, you'll recognize the simplicity of templating with facelets. I've stripped out everything else except the pages themselves, just to put our focus on facelets. This is a Maven based project, and you need Tomcat (or any servlet container) to run the resulting webapp. To begin with this is the list of files:
./pom.xml ./src/main/webapp/home.xhtml ./src... I left faces-config.xml in there for completeness sake, it may not be needed. The Maven POM ( pom.xml ): <?xml version="1.0" encoding="UTF-8"?> <project... Web app configuration ( WEB-INF/web.xml ): <?xml version="1.0" encoding="UTF-8"?> <web-app... Empty WEB-INF/faces-config.xml : <?xml version="1.0" encoding="UTF-8"?> <!-- Thi... index.jsp is simply a redirect to home.jsf : <% response.sendRedirect("home.jsf"); %>...
Created by Fang on October 28, 2011 14:49:53
Last update: October 28, 2011 14:52:19
Facelet templates can be nested, for example, a page can use a template which inherits from another template. To demonstrate this, let's start from the simple example and make these additions:
Add a place holder for CSS style sheets in WEB-INF/templates/default.xhtml :
<h:head>
<title>Facelets Template Demo</tit...
Add a derivative template ( WEB-INF/templates/default-style.xhtml ) which provides CSS:
<?xml version="1.0" encoding="UTF-8"?>
<ui:comp...
Add a page that uses the styled template ( home-style.xhtml ):
<?xml version="1.0" encoding="UTF-8"?>
<ui:comp...
The only difference between this file and home.xhtml is the template being used.
Compare the display of the pages home.xhtml and home-style.xhtml .
Created by Fang on January 23, 2011 19:28:35
Last update: October 28, 2011 12:10:07
Maven repositories are a central part of the Maven build system. Maven resolves dependencies through repositories. There are two types of repositories: local and remote . The local repository stores local build artifacts (when you do mvn install ) and caches artifacts from remote repositories. It is usually located on the local file system at $USER_HOME/.m2/repository . Remote repositories are located on the network and accessed by URLs ( http:// or file:// etc). The central Maven repository is: repo1.maven.org . The Java EE repositories are located at: http://download.java.net/maven/2/ and http://download.java.net/maven/1/ . Remote repositories can also be set up on the company intranet within a company's firewall. The central repository is automatically configured after installation. You can add additional repositories in settings.xml , for example:
<?xml version="1.0" encoding="UTF-8"?> <setting......
Created by Fang on October 22, 2011 20:43:31
Last update: October 22, 2011 20:45:13
The only explanation of why some Java EE API classes are stripped off methods implementations I can find is this JBos forum post: What's the cause of this exception: java.lang.ClassFormatError: Absent Code? which also provides some workarounds for these crippled API classes. The explanation offered was: When one compiles, they want to run as well. By the way, we have been promoting full set of Java EE APIs which can only be used for compilation - they are stripped off method details. That way, user can't take those artifacts and try to use it in runtime. Honestly, I don't see any logic in those statements. This is the only place any such explanation is offered. Yes only from this JBos forum post! There's no public...
Created by Fang on October 22, 2011 19:51:05
Last update: October 22, 2011 20:31:48
I built a very basic JSF application and deployed to Tomcat 7.0.22, but it failed with this error:
Caused by: java.lang.ClassFormatError: Absent Code... That looks weird and I wasn't able to find a sensible explanation! So I copied the jsf-api-2.1.jar , which was downloaded from the java.net Maven repository by Maven, into a temp folder. And tested it with this simple program: public class ClassFormatErrorTest { public ... I also copied servlet-api.jar from Tomcat's lib folder to the temp folder. Sure enough it failed with the same error: C:\tmp>java -cp .;jsf-api-2.1.jar;servlet-api.jar ... But when I replaced the javax.faces.webapp.FacesServlet class with one I compiled from source, the error disappears! Conclusions: The jar file jsf-api-2.1.jar from java.net Maven repository is good for compilation only (cannot be used...
Created by freyo on September 29, 2011 16:01:31
Last update: September 29, 2011 16:09:37
With standalone broadcast receiver
AndroidManifest.xml :
<?xml version="1.0" encoding="utf-8"?>
<manifes...
Java code:
package com.android.networkreceiver;
import...
Register listener inside Activity programmatically
AndroidManifest.xml :
<?xml version="1.0" encoding="utf-8"?>
<manifes...
Java code:
package com.android.networklistener;
import...
Register/unregister broadcast receiver in onResume / onPause works because the connectivity change broadcast is sticky . I intentionally used two registerReceiver calls in onResume to demonstrate this - onReceive will be called once for each registration.
Created by freyo on May 13, 2011 15:45:29
Last update: September 20, 2011 08:08:12
This is an Android app that dumps any binarized xml file as plain text - to the sdcard on the device or emulator.
build.xml :
<?xml version="1.0" encoding="UTF-8"?>
<project...
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<man...
res/layout/main.xml
<?xml version="1.0" encoding="utf-8"?>
<Lin...
res/values/strings.xml :
<?xml version="1.0" encoding="utf-8"?>
<res...
src/com/android/xmltool/DumpXml.java
package com.android.xmltool;
import java.ut...
Screenshot
Pre-built APK can be downloaded from: http://code.google.com/p/android-binxml-dump/
