Updated: 17/4/07; 10:49:49.
James Strachan's Weblog
Ramblings on Open Source, Java, Groovy, XML and other geeky malarkey
        

Thursday, October 31, 2002

iBATIS JPetStrore 2.0 in the works. Now this is what I call doing some real work and makeing Java work for you. [dsuspense]

Interesting stuff.


9:28:47 PM    comment []

Look at Nanning. Nice one! [Joe's Jelly]

This looks great. I really like the example.


2:24:01 PM    comment []

An interesting article by Tyler Jewel on why stateful session beans should typically be avoided if you're using a Servlet engine. Here's another article that shows that using them is more trouble than its worth and typically have zero performance benefit.

So if entity beans suck, and stateful session beans suck, all thats left of EJB thats of any real value is stateless session beans. Which is kinda like RMI with a simple transactional interceptor.

Its no suprise to see that all the EJB vendors have been quietly de-emphasizing EJB and talking up web servies instead for quite some time.


12:20:20 PM    comment []

XWork, Ognl, and type conversion.

Today I spent some time on seeing if Ognl would be a good choice for bean manipulation in XWork. Well, things were running well until I hit two very large snags

1) Performance is the pits. I mean, Ognl is literally 25X slower than WebWork's BeanUtil method.

2) Ognl, like BeanUtil, OSCore BeanUtils, and Jakarta Commons-BeanUtils, has no way to get data in a type-specific way. This is actually more important than people tend to think. Sure, converting from input is important (setValue in all the above implementations has a way to convert data), but getting the data back in the same way we set it is equally important. Example:

User inputs a date as "02/12/1982". This should be calling FooAction.setBar(Date). FooAction also has a method "Date getBar()". But when we display the data back to the user, we want to display it as "02/12/1982" or "12/02/1982" or however the user first entered it. This means that type conversion needs to happen both ways, not just for setting values. So I think I'll write my own code that does this and is tuned specifically for XWork (Ognl has too much other stuff going on, which is probably why it's so much slower).

[PSquad's Corner]

commons-beanutils comes with a ConverterUtils helper class for performing type conversions if you need it, which can work both directions.

However  it sounds like what you really want to do is to use internationalization to convert the value into a localised String representation? If its any help, there's various JSP custom tags in JSTL for doing this kinda thing.


7:47:34 AM    comment []

XML APIs. I am trying to get a good comparative benchmark of the current XML APIs (JDOM, dom4j, etc, etc).
I was able to find this document.
But seeing that it uses the v7 of JDOM and v8 claims great performance improvements I am not sure how valid it is.
Any of you out there have a preference, biased by performance, on your XML API?
I am using JDOM v8 right now, but am thinking of switching my code to dom4j since it seems to be fast and also has XPath built in, so I don't have to use jaxen separately to traverse my Documents.
Maybe James will have some insight since he works on dom4j and jaxen.

I am running into performance problems on a work project where I am needing to build an XML document (used for reporting via the web) with up to 60,000 entries (leaf nodes).
I use XPath to update nodes in the tree as well.
I store this document as a blob in an Interbase database, and retrieve it for viewing via the web, which uses a server side XSLT transformation of the document to HTML.
I am using JDOM v8, jaxen for XPath traversal and xalan for XSLT transformation.
From what I have seen so far the bottlenecks are the XPath node updates, serialization to a blob for storage, and XSLT transformation for view. [dsuspense]

I'm obviously biased - use dom4j! :-)

Irrespective of whatever model you use, I'd certainly recommend a few things.

  • cache the XML parser. In dom4j this is the SAXReader. Can't remember the similar class in JDOM. Its SAXParser in JAXP. Basically reuse these things as they typically have considerable startup time. (Its the underlying XML parser that takes the time to warm up). Though only use the parser by 1 thread at once.
  • cache the XPath expression objects. This avoids parsing the XPath expressions each time you use them
  • do you need to parse and process the whole document in one go? 60K nodes is quite a lot. dom4j has an ElementHandler feature that allows you to process things in a 'row by row' kinda manner which if you've a large document can boost performance considerably by requiring much less RAM and having a much smaller document on which the XPaths operate.
  • try cache the output of XSLT stylesheets as they can be expensive to run.
  • when using XPath try to use relative rather than absolute expressions. So //foo is always gonna be slow for a large document. If possible try to refactor out common parts of XPath expressions and use variables. e.g. foo/bar/a and foo/bar/b could be refactored to create a variable bar of the value foo/bar and then reusing that for $bar/a and $bar/b. It can be tempting to use XPath a little too much... :-) 

Dunno how applicable the above is but thats my general XML performance advice.


7:41:52 AM    comment []

© Copyright 2007 James Strachan.
 
October 2002
Sun Mon Tue Wed Thu Fri Sat
    1 2 3 4 5
6 7 8 9 10 11 12
13 14 15 16 17 18 19
20 21 22 23 24 25 26
27 28 29 30 31    
Sep   Nov




Click to see the XML version of this web page.
Subscribe to "James Strachan's Weblog" in Radio UserLand.
Click here to send an email to the editor of this weblog.
blogchalk: James/Male/31-35. Lives in United Kingdom/London/Islington and speaks English. Spends 60% of daytime online. Uses a Fast (128k-512k) connection.
this site is a java.blog

currently subscribed to:

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. <big>kev's</big> catalogue of this and that.

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. /\ndy's Weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. /dev/null

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. ::Manageability::

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Abe Fettig's Web Workshop

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Absurdities and nonsenses

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. All Things

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. All Things Distributed

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Andres Aguiar's Weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Aslak Hellesoy's Weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. bayard

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Be Blogging

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Blaug Blawg Blog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Blogging Pubbitch

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. bob mcwhirter

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Brett Morgan's Insanity Weblog Zilla

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Brian Behlendorf's Blog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Brian Jepson's Weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Brian Maso's Tecno-Geek Weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Bright Eyed Mister Zen

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Cafe con Leche XML News and Resources

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. CapeBlog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Citations for : squishy

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Clemens Vasters: Indigo'ed

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Cocoon and more

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Code Feed

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Code:Q

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Codito ergo sum

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. corporate eejit

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Coty's Radio Weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Craig Burton: logs, links, life, and lexicon

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. crazybob.org - web log

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Crowbar Tech

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. cwinters.com

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Darren Hobbs

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. deem

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. deep:code

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. dion

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. dive into mark

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. DJ's Weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Don Box's Spoutlet

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Don Park's Daily Habit

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. dorodok

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Doug Kaye: Web Services Strategies

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Eclectic

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Eric Alexander

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. ericfreeman.com

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Erik Hatcher - Blog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Erik's Weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Fast Takes

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Forwarding Address: OS X

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Free XML tools

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Glen Daniels

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Gordon Weakliem's Weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. graham glass: what's next?

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. gru's logic

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. grubbel

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Guido Casper's Radio Weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. IKVM.NET Weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Jason Carreira

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Java Testing, Tools, and Engineering

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. java.sun.com

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. JavaGu(i)(y)

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Jeff Turner's Weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. jelly

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. jeremiahcode

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Jeremy Allaire's Radio

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Joe's Jelly

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Joel on Software

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Jon's Radio

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Jon's StudioZ.tv Blog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. josh lucas' Radio Weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. jutopia

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. kdub's log

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Ken Bereskin's Radio Weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Knowing .NET

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. mabo

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Mac Net Journal

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. MacSlash

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. manicwave

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Mark O'Neill's Radio Weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Martin Dulisch's Radio Weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Matt Croydon::postneo

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Memory Dump

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. meta-douglasp

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. miceda

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Michael J. Radwin's blog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Mike Clark

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Mitch Kapor's Weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Mozquito XForms

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Nathan Torkington's Radio Weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Nicholas Riley's Weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. nickminutello

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Ockham's Flashlight

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Off the beaten track

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. ongoing

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Organic BPEL

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Otaku, Cedric's weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Outer Web Thought Log

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Ovidiu Predescu's Weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Part of the problem.....

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Patrick Chanezon's Radio Weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Patrick Logan's Radio Weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Peter Drayton's Radio Weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. PragDave

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. PSquad's Corner

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Pushing the envelope

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Raible Designs ~ We Build Web Apps

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Random thoughts

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Ray Ozzie's Weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. rebelutionary

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Remus

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Rick Salsa's Blog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. rinkrank

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Rod Waldhoff's Weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. rosewater

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Royle's Random Ruminations

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Sam Ruby

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Sanjiva Weerawarana's Radio Weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Sean McGrath, CTO, Propylon

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Service Oriented Enterprise

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. skizz.biz

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Sklires Skepsis...

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Small Values of Cool

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Spike's GeekBlog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Steve Conover's Weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Steve's Radio Weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Technomagica

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Ted Leung on the air

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. The Blue Pill

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. The Fishbowl

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. The Mountain of Worthless Information

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. The Occasional Blogger

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. TheArchitect.co.uk - Jorgen Thelin's weblog

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. TheServerSide.Com: Your J2EE Community Forum

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. thinair

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Thinking About Computing

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Tobiased thoughts

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Tomalak's Realm

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. toolbox

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. transMorphic

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Vincent Massol Think Tank

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Weblog for Costin Manolache

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Weblog: Morgan Delagrange

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. WebMink

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. Whispering

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. X180

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. XMLhack

Radio UserLand users: click to subscribe. Other folks: use the RSS link to acquire this channel. xpzen.com: what's on my mind

Here's how this works.