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Posts Tagged java

Book Review – Beginning Java EE 6 Platform with GlassFish 3

Aug 18

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Book Review – Beginning Java EE 6 Platform with GlassFish 3: From Novice to Professional

Good for beginners.

This is a ideal book for someone starting Java Enterprise Edition (JEE), but also useful for those who want a brief overview of the ne features. It focuses on the changes in version 6 with examples in Glassfish. It also mentioned some of the significant changes in 5 and gives a good high level overview of the JEE platform in general. It also explains things like persistence layer, and ORM.

I’d recommend it to someone who’s new(ish) to java and whats to see what JEE/J2EE is all about. It’s not good as a reference book (but then it’s not pretending to be one.)

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Setting Proxy for java app

May 28

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hi, was playing around trying to get a rest API call to work and keep getting connection and timeout issues. Released as I am doing a HTTP request it needed to be routed via the company proxy server, here’s how I set the proxy details.

System.setProperty(”http.proxySet”, “true”);
System.setProperty(”http.proxyHost”, “130.x.x.x”);
System.setProperty(”http.proxyPort”, “80″);
System.setProperty(”http.proxyUser”, “UsernameHere”);
System.setProperty(”http.Password”, “PAsswordHere”);

Note: This was just a proof of concept to test out consuming a rest webservice, I’m not advocating this as the best way to set the proxy details.

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Client side show/hide in using ibmfaces JSF components

May 26

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This is a little note about showing and hiding a element(s)/control(s) from a client side event (without page refresh) using the ibm JavaServer Faces components.

The IBM documentation for the hx:behavior tag is here. But it doesn’t contain examples of how to use it and the describtion of the hx:behavior attributes is unclear in places.

behaviorAction is what you want to do (hide, show, invisible, visible etc)
targetAction requires the ID of the object you want to do the behaviorAction on.

<h:outputText style=“visibility:hidden;” id=“text7″ value=“Initially i’m hidden, “></h:outputText>
<h:outputText style=“visibility:hidden;” id=“text17″ value=“As am I! “></h:outputText>

<h:outputText styleClass=“outputText” id=“text6aa” value=“view hidden text,”>
<hx:behavior id=“behavior4″ event=“onclick” behaviorAction=“visible;visible” targetAction=“text7;text17″> </hx:behavior>

</h:outputText>

Also found that when you specify more than one targetAction you must also specify a behaviorAction for each (which is good if you want to do different behaviorActions to each target.

Note: offically hx:behavior tags aren’t supported in h:outputText, recommended to use outputlink tag.

Info from my Ibm devworks question post

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Passing client browser info to JSF via javascript

Aug 22

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I wanted to get the clients browser info and screen resolution and pass in into to a contact form so I can tell a little bit about the client’s browser encase of unreproducible issues. Basically run a javascript function to collect the info from it’s implicit objects and write that to a hidden form element.

Had this working in JSP ok, and with a slight tweak to account for the : in the hidden field id (fromname:compnonentId) it works.
In JSF file…

function getClientInfo()
{
var clientinfo = “”
clientinfo+=”Browser:” + navigator.appName + “,”
var b_version=navigator.appVersion
clientinfo+=” Version: ” + b_version + “,”
clientinfo+=” Screensize: ” + screen.width +”x” + screen.height
(document.getElementById(’contactfrm:clientinfo’)).value = clientinfo;
}


‹h:form id=”contactfrm” styleClass=”form”>

In Backingbean the usual code to get a request param:

String clientInfo = getFacesContext().getExternalContext().getRequestParameterMap().get(”contactfrm:clientinfo”);

Or is there a better way of doing this? comments most welcome

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