Chinto's blog » java

Evaluate an EL expression

Kishore — Tue, 08 Feb 2011 07:33:05 +0000

Once you start using EL heavily within your UI, eventually you will want to use it/evaluate it back in your EJB’s and Seam/Spring components

There are three steps to evaluating an EL expression.

//get current EL context
javax.el.ELContext elContext = javax.faces.context.FacesContext.getCurrentInstance().getELContext();
 
//get the expression factory (for seam). You can probably do ExpressionFactory.newInstance() if not using seam .
javax.el.ExpressionFactory expressionFactory = org.jboss.seam.core.Expressions.instance().getExpressionFactory();
 
//Create value expression as the EL I'm evaluating is a value e.g. #{bean.property} . Create MethodExpression if the EL is a method e.g. #{bean.method()}
javax.el.ValueExpression valueExpression = expressionFactory.createValueExpression(elContext, elExpressionYouAreEvaluating, WhateverYouAreExpecting.class);
 
// get value and dont' forget to cast.
whateverYouAreExpecting = (WhateverYouAreExpecting) valueExpression.getValue(elContext);

Yup.. that’s how convulted this is . It should more be like below

1 2	//NOTE: imaginary code Object value = ExpressionFactory.getValue("#{bean.property}");

That’s what these guys are asking as well..

DEBUG logging not working in jboss (jboss 5 and log4j)

Kishore — Mon, 23 Aug 2010 02:18:58 +0000

Just did a small post about log4j DEBUG logging not working in jboss 5.1.0.

http://community.jboss.org/people/kchintoju/blog/2010/08/22/debug-logging-not-working-in-jboss-jboss-5-and-log4j

Subversion proxy connection issues with Eclipse (In windows)

Kishore — Wed, 11 Mar 2009 06:56:33 +0000

If you are having issues connecting to your subversion repositories from Eclipse (May be with Subversive/Subclipse). Try the following.

Enter proxy details into Subversion configuration:

Open servers file in the following location

Window XP: C:\Documents and Settings\MyUserId\Application Data\Subversion\servers
Windows Vista: C:\Users\Clientside\AppData\Roaming\Subversion\servers

Update following lines at the end of file

[global]
http-proxy-exceptions = yourproxy exceptions (e.g. dev.company.com.au)
http-proxy-host = yourproxyhost (e.g. proxy.company.com.au)
http-proxy-port = your proxy port (e.g. 8080)
http-proxy-username = proxyusername
http-proxy-password = proxypassword

This step might not be needed all the time

Update Eclipse Proxy settings

Windows > Preferences

Type ‘proxy‘ in the filter text box. Go to ‘Network Connections’ config page. Choose manual proxy configuration and Update the proxy details.

Eclipse/RAD debugger timing out before starting server

Kishore — Sat, 21 Jun 2008 00:31:00 +0000

Is your RAD/Eclipse Java debugger timing out before starting the server?

Have a gazillion projects in RAD/Eclipse which all have to be deployed in server for debugging all the time like I do?

There is an easy way to increase RAD/Eclipse debugger timeout.

Go to Windows > Preferences > Java > Debug
Increase both “Debugger time-out” and “Launch time-out” value to be much larger. Try values like 180000/360000 respectively for time-out values of 3 and 6 mins.

Full article at IBM

http://www-1.ibm.com/support/docview.wss?rs=2042&context=SSRTLW&context=SSJM4G&context=SSSTY3&context=SSCGQ7C&context=SSDV2W&uid=swg21212755&loc=en_US&cs=UTF-8&lang=en