Under what circmustances, is BodyContent null?

Hi,
I got a problem with BodyContent in my custom tag. I created the class that extends BodyTagSupport, and I use bodyContent object, which is a field of BodyTagSupport, in doEndTag method.
The problem is "bodyContent is always null." Why is that? Does somebody tell me, under what circumustances, bodyContent is null? And how can I get bodyContent object appropriately?
thanks.

Body content refers to what is between your start/end tags of your custom tag.
ie
<my:tag>This is some body content</my:tag>
So obviously you need to put something in the body before getBodyContent() will return anything.

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Under what circmustances, is BodyContent null?

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