According to JSP specs if you're attemting to initialize a bean property from a
request parameter that does not exist or is defined as an empty value then
<jsp:setProperty> command has no effect: the tag is just ignored. More exactly
(from the JSP 1.1 spec):
"If the param is not set in the Request object, or if it has the value of "",
the jsp:setProperty element has no effect (a noop)"
hth
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>
>Hi, I'm new to this list, and hope this is the appropriate forum. Kick me
>over to a developer forum if not...
>
>I am developing JSPs with JavaBeans and have run into an issue with "blank"
>input fields on the form. An empty string, "", is NOT passed to the setter
>method on my beans. I have researched the source code in
>JspRuntimeLibrary.java and found the introspect (Tomcat 3.1) /
>introspectHelper (Tomcat 3.2.1) method intentionally excludes parameters
>that have a NULL or "" value - of course NULL could never happen because of
>the flow of the code, but never mind that.
>
>I guess my question is this. Is this correct functionality. I have read
>the JSP 1.1 specification on the topic of the setProperty tag, and it is NOT
>specific regarding this matter. It is a huge problem for me because I have
>beans that have a session scope and a particular property of the bean may be
>"Fred" but if I blank out the related input field it doesn't overwrite the
>value in the bean when I submit the form. Hope this makes sense.
>
>Any and all help would be appreciated.
>
>Thanks!
>
>Michael W. Housman Jr.
>Optimal Systems Design, Inc.
>Consulting at Wells Fargo Services Company
>Phone: 612.341.9784
>Cell: 612.386.6785
>Office: 763.537.2631
