Get basename in JSTL

dravidnsr,

For example, given: "java.lang.NullPointerException"

I want the substring, 'NullPointerException'.

The solution has to be generic enough to handle any exception name

ie: java.io.IOException, org.springframework.webflow.engine.NoMatchingTransitionEngine, etc.

I think using a custom function is the cleanest way. It is really easy as well.
The following code is my best try using JSTL.

<c:forEach items="${fn:split(exception,'.')}" var="current" varStatus="status" >
  <c:if test="${status.last == true}" > ${current} </c:if>
</c:forEach>

You can use split method by separator ., and take last value from string array.

karanw>You can use split method by separator ., and take last value from string array.
That is what I just posted.

sorry, I didnt see your post.

softechnics:,

you can give customer msg when ur error msg set it to  ${rootCause.error}

if u got DB error means u can do split  but other error(expection) means what u will do ??

All,

I'm working on creating a custom taglib. Who said this was easy? Yer NUTS!!! :-)

I said creating a custom function was easy.  Is that what you are doing ?  Show us where you are having trouble.

Not terribly difficult, but not trivial, either. Typical Sun documentation - not clear and somewhat ambiguous.

I wrote the function, compiled it, packaged it in a jar file and put it in the lib folder under WEB-INF.
Edited web.xml to tell Tomcat about it.
Added taglib declaration in JSP.
Ran it and got:

"The function lastIndexOf cannot be located with the specified prefix"

Saw something about taglib handlers. Is that required?

I think you are confusing "custom tag"  with "custom function".    
First no editing of your web app's web.xml file is necessary.  Here is how I did it. My code is below here.
I created a file called   myFunctions.tld   and placed it into my web app's WEB-INF folder.
I created a file called  Basename.java and compiled it.
I placed Basename.class into a folder called rrz and placed that into my web app's classes folder.
On my JSP I have

<%@taglib prefix="my" uri="/WEB-INF/myFunctions.tld" %>
<c:set var="exception" value="org.springframework.webflow.engine.NoMatchingTransitionEngine" />
Exception is ${my:basename(exception)}

<?xml version="1.0" encoding="ISO-8859-1" ?>
 
<taglib
    xsi:schemaLocation=
    "http://java.sun.com/xml/ns/javaee web-
        jsptaglibrary_2_1.xsd"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    version="2.1" >
  <tlibversion>1.1</tlibversion>
  <function>
    <name>basename</name>
    <function-class>rrz.Basename</function-class>
    <function-signature>
        String basename(java.lang.String)
    </function-signature>
  </function>
 
</taglib>
--------------------------------------------------------------------------
package rrz;
public class Basename {
  public static String basename( String exception) {
        return exception.substring(exception.lastIndexOf(".") + 1);
  }
} 
----------------------------------------------------------------------------

                                              

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I guess the really confusing part of this is that the function name is what appears in the EL on the JSP.
EL looks for that named function in the tld and uses the listed  method signature to find the correct method in the class file.  
To make it easier, I just use the same name for the function and for the method (basename in this case).

I got it running for a single method in my tld library, but when I added a second method to the class, I get an error that it cannot find the second method (even though it precedes the first method I wrote and THAT method IS found and executed ok.?!?!)

I edited the web.xml so my JSP tld declaration looks like a standard URL - http:softechnics.com/softretail/... That works OK. I also package up the class and tld into a jar file that goes into WEB-INF/lib. The tld is also placed in WEB-INF. Not sure why it needs to be in both places - or does it? Anyway, this all works for my first method, but not my second. Bummer! Still working at it, though.

All's well. Thanks.