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Security

Servlet 3.1 Specification (JSR 340) and Java Authorization Contract for Containers (JSR 115) MR3 are almost ready for release. Besides "*", the role-name "**" is introduced in the above two specifications. In a nutshell, "*" means any role defined in web.xml and "**" means any authenticated user. Prior to Servlet 3.1, web containers use proprietary mechanisms to add security-constraints for any...
on Apr 19, 2013
Servlet 3.1 Specification (JSR 340) is almost ready for the release. Several new security features have been added in this version of Servlet specification. In this blog, I will explain one of the security features, namely deny-uncovered-http-methods. Let us take a look at a simple security-constraint in web.xml as follows: <web-app xmlns="http://www.w3.org/2001/XMLSchema" ...
on Apr 19, 2013
Servlet 3.1 was in Public Review in Janurary 2013. And it is in Proposed Final Draft now. Most of the new features are related to security. In this following, I will highlight features since Servlet 3.1 Public Review: add new API javax.servlet.http.Part#getSubmittedFileName add new API javax.servlet.ServletContext#getVirtualServerNameThis API allows a JASPIC module to be registered in a Servlet...
on Mar 18, 2013

JSR

Servlet 3.1 (JSR 340) is almost ready for the release. One of the new features is the support for non-blocking IO. ReadListener and WriteListener are introduced to allow non-blocking processing in Servlet. Non-blocking IO can only be used in async (defined in Servlet 3.0) or the upgrade mode. We can set the async in a servlet with @WebServlet annotation. In this blog, we will illustrate the use...
on Apr 16, 2013

J2EE

If you have wanted JSF not to store any state now is your chance to try out the stateless mode of JSF. It is as easy as doing the following: <f:view transient="true">  Your regular content</f:view> And voila you are running stateless. If you decide you do want some state to be kept at the server you can use the @xxxScoped annotations on your beans Be aware that...
on Feb 8, 2013
The following blog articles are part of the JSF Validator series Introduction to JSF Validators The JSF Validator API The LengthValidator The LongRangeValidator The DoubleRangeValidator The RegexValidator The RequiredValidator Writing your own Validator Packaging your JSF Validator Multiple component validation The BeanValidator The FacesValidator annotation
on Sep 17, 2012
In the previous blog entry titled "Writing your own validator" you learned how to write a validator and hook it up for validation. At that time we made it all work using the faces-config.xml file. There is however another way, which we will describe below!   package nohelloworld;  @FacesValidator(value="NoHelloWorldValidator")  public class NoHelloWorldValidator...
on Sep 17, 2012
Since JSF 2 it is also possible to use BeanValidation as specified in JSR 303. The following blog article describes how this JSR has been integrated within JSF 2. With the following JSF managed bean. public class UserInfo {    /**     * Stores the username.     */    private String username;    /** ...
on Sep 17, 2012
Writing your own validator is a straightforward process. It involves implementing the Validator API and making sure you register it properly. Say you want to write a validator that will not allow you to use the string "Hello World" as a value.   package nohelloworld;  public class NoHelloWorldValidator implements Validator {        public void...
on Sep 9, 2012
Say you want to make sure that a value is required. <html xmlns:h="http://java.sun.com/jsf/html"  xmlns:f="http://java.sun.com/jsf/core">  <h:inputText value="#{user.firstName}">   <f:validateRequired/>  </h:inputText> </html> If you want to disable the RequiredValidator on a page you can...
on Sep 7, 2012
If you want to validate input against a regular expression then you would use the RegexValidator. Say you want to make sure only letters are used for a name. <html xmlns:h="http://java.sun.com/jsf/html"  xmlns:f="http://java.sun.com/jsf/core">  <h:inputText value="#{user.firstName}">   <f:validateRegex pattern=...
on Sep 6, 2012
Just like the LongRangeValidator before the DoubleRangeValidator validates if the given value is within the given range, but then a range of doubles. Say you want to make sure your donors can donate as little as 1.00 but at most 250.00. <html xmlns:h="http://java.sun.com/jsf/html"  xmlns:f="http://java.sun.com/jsf/core">  <h:inputText value=...
on Sep 5, 2012
The LengthValidator is one of the standard validators that is specified by the JavaServerFaces specification. It allows you to verify (validate) if the proposed input (submitted value) on a given component is valid. Say you want to make sure the minimum length of a password is 6 characters and up to 12 characters. The example below describe how you would put this into a JSF page to make that...
on Sep 4, 2012
During the JSF lifecycle each input value can be validated. As such the JSF runtime allows you to write validators that will take care of that during request processing. Several standard validators are part of the standard JSF runtime. Note that the specification has been written with extension in mind so it is also possible to write your own validator and hook it up for request processing...
on Sep 1, 2012
While I don't normally blog about the exiting world of JVM command line options, this new 7.0 option, which allows you to rotate to a new GC log file, was just so exciting... err... not so widely published that I decided to share. Of course these options only apply when you've used the -Xloggc: option. The settings are; UseGCLogFileRotation, default value: false NumberOfGCLogsFiles, default value...
on Aug 20, 2012

Community

I am glad our team and me ofcourse, part of the Support mySchool project in WorldBank for Indonesia's Ministery of Education and Culture (MoEC), the URL is http://bantusekolahku.kemdikbud.go.id The first social media that linked with all the role in our govermental (from ministery directorate, province's education structure, district's educatio structure and schools structure). The public...
on Dec 13, 2012
Oracle just give free ADF Essential on Glassfish, a streamline edition of ADF. An interesting thing is there are also OEPE (Oracle Eclipse Plugins) that have ADF inside. which the Jdeveloper edition is far more complete and rich. www.oracle.com/technetwork/developer-tools/adf ADF Essential is free for glassfish deployment, and with support US$ 1250/server (/core??), and you will get the source....
on Sep 29, 2012

JavaOne

Here are my slides on my "Remoting Retrospective" presentation at JavaOne 2012: Remoting Retrospective (pdf)
on Oct 26, 2012

Web Applications

If you want to make sure a value is within given Long range then the LongRangeValidator is for you! Say you want to make sure your users are at least 13 but at most 18. <html xmlns:h="http://java.sun.com/jsf/html"  xmlns:f="http://java.sun.com/jsf/core">  <h:inputText value="#{user.age}">   <f:validateLongRange...
on Sep 5, 2012

Web Design

The definition of a Validator according to the Validator interface: void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException The Faces Context is passed in so the validator can introspect various aspects of the request and response. The UI component is passed in because the actual value will be stored in that UI component after it has been...
on Sep 3, 2012