using static modifier with Seam logger

asookazian Dec 6, 2007 11:04 AM

On pg. 254 of 2.0.0.GA ref pdf, it states the following regarding @Logger:

"Specifies that a component field is to be injected with an instance of org.jboss.seam.log.Log"

I noticed that in my SFSB, I may use the following code without error:

@Logger
private Log log;

But if I use the same code in a Seam POJO used as an interceptor class I will get a NullPointerException (e.g. when log.info() is invoked).

If I use the following code in a Seam POJO used as an interceptor class, there is no exception:

@Logger
private static Log log;

Is this the correct behavior and what accounts for the difference?

1. Re: using static modifier with Seam logger

pmuir Dec 7, 2007 6:16 AM (in response to asookazian)

The injection for static loggers is different - static loggers are injected at component install, non static at component instantiation (think about what static means)
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2. Re: using static modifier with Seam logger

asookazian Dec 7, 2007 11:40 AM (in response to asookazian)

well I understand the meaning of static (you don't need to instantiate the object manually to reference it, it's already instantiated). My question was wronngly worded. I meant to ask why do I need to use static (why doesn't it work without static, i.e. it's null object w/o static). In a SFSB this is not the case.

You already indicated that it's not advisable to use a Seam POJO as an interceptor so perhaps this has something to do with it...
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3. Re: using static modifier with Seam logger

pmuir Dec 9, 2007 7:11 AM (in response to asookazian)

The interceptor isn't instantiated as a seam component when used, but it is installed as a component.
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