jsp:setProperty & null-values binding

[Roberto Pierpaoli <pi...@dudat.it>]

Hi guys,

my name is Roberto, I work as Engineer for an Italian software-house 
named "duDAT".
We do an intensive use of the JSP technology, since web applications are 
our main product.
Recently we have faced a problem dealing with the JSP specifications, 
more precisely with the following lines about the “setProperty” tag:


/"Sets one Bean property to a specific value. The value can be a 
/|/String/|/ or an //Expression/ 
<http://java.sun.com/products/jsp/tags/syntaxref.fm4.html#11258>/. If 
you use a /|/String/|/, it is converted to the Bean property's data 
type, according to the conversion rules shown above in //TABLE 1-1/ 
<http://java.sun.com/products/jsp/tags/syntaxref.fm13.html#17460>/. If 
you use an expression, the data type of the value of the expression must 
match the data type of the Bean property. /

/_*If the parameter has an empty or null value, the corresponding Bean 
property is not set. *_/

/You cannot use both the /|/param/|/ and /|/value/|/ attributes in a 
/|/<jsp:setProperty>/|/ tag." /


Well, the fact the an empty value is not bound cause us some problems, 
to change this behavior we have been obliged to recompile Tomcat after 
changing a line in “JspRuntimeLibrary.java”. So we are wondering:

1 – if this is the only (and the cheapest) solution to our problem;

2 – the reason why this behavior is not configurable;

3 – if any change has been planned over this point.


Your feedback will be very appreciated.

Thanking you in advance.


Roberto and duDAT Company


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