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Re: Problem passing strings to my wrapper component
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Re: Problem passing strings to my wrapper component


  • Subject: Re: Problem passing strings to my wrapper component
  • From: "Jerry W. Walker" <email@hidden>
  • Date: Sat, 24 Feb 2007 18:15:21 -0500

Hi, Kevin,

On Feb 22, 2007, at 11:51 PM, Kevin Windham wrote:

I have a page wrapper and I've set up an API for it so I can pass some variables to it from the pages containing content. I have managed to pass Boolean values without any problem. ...

However, if I do the same thing with a string, I get a null pointer exception. The only difference I can see is there is no option for String in the value set menu, so I just leave that unset. I imagine I am missing something, but I can't seem to find any leads on what it is.

... Is there any documentation on the chain of events for this scenario?

There is, and Mike Schrag was right, it's hard to beat the chapter on "The Secret Life of Components" in Chuck & Sacha's book.


However, there's also good documentation online on the chain of events for this scenario.

For a good overview of the general method invocations on WOApplication, WOSession and WOComponent during the Request-Response loop, take a look at:

http://developer.apple.com/documentation/WebObjects/Web_Applications/ Articles/1_Architecture.html#//apple_ref/doc/uid/TP40003268-SW13

You'll need to be well grounded in those Request-Reponse Loop calls to understand what's going on with InterComponent communication. Once you've got that down, then for a good overview of InterComponent communication, take a look at:

http://developer.apple.com/documentation/LegacyTechnologies/ WebObjects/WebObjects_4.5/System/Documentation/Developer/WebObjects/ DevGuide/ReusableComponents4.html

If you read that page and the other pages in that section of the manual, you will far better understand how to control it and what you can do to make it much more efficient.

This latter page was written for WO 4.5, but the things they're describing haven't changed much since, so if you understand that material, any minor changes are well covered in the WO 5.x API documentation.

Good Luck

Regards,
Jerry


--
__ Jerry W. Walker,
WebObjects Developer/Instructor for High Performance Industrial Strength Internet Enabled Systems


    email@hidden
    203 278-4085        office



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 >Problem passing strings to my wrapper component (From: Kevin Windham <email@hidden>)

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