Are javabeans thread safe in a jsp environment?
I am a newbie as far as developing in Java. However, I want to create a
simple web based application which will allow web users to update a
database.
I have apache2 and tomcat4 installed with mod_jk to provide the link between
the two
I think I want to use jsp as the main tactic for controlling the dynamic
format for each page that I display, but provide "behind the scenes" logic
in JavaBeans.
There are two elements that I am not sure how I hold the information for.
1) Database connections - presumably taken from a connection pool
Is it normal to store these in a bean? if so, do I declare the bean scope
to be a page, request or a session (I forsee having to use <jsp:forward />
directives after using logic which needs to differnt things dependant on
what is in the database. Are the properties of page/request/session scope
beans thread safe?
2) Prepared sql statements
I would like to have several of these to cover the main cases of querying
the database.
- do they need to be associated with connection - in which case I presume
their life is only for the same life as the connection?
- can they be cloned - ie so that I create them in a application scope bean
and then copy them into the bean that has less scope?
I can't find any documentation which provides answers to these questions.
It seems they are the sort of issue that has to be dealt with regularly in
the development of web applications - so where would the standard answers
be?
--
Alan Chandler
alan@chandlerfamily.org.uk
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