Tomcat 5.0.16 jsp:useBean of type java.util.List won 't compile 2004-01-12 - By Jason Wilson
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I have some jsp pages that now break in Tomcat 5.0.16.
In particular, my use of the jsp:useBean tag is no
longer working, it fails to compile.
## <jsp:useBean id="myListBean" scope="session"
class="java.util.List  "/>
In the generated servlet, it attempts to do a
## java.util.List .html>java.util.List java.util.List .java.html>' border=0> myListBean = new java.util.List .html>java.util.List java.util.List .java.html>' border=0>();
which does not work, since it is not a concrete class.
In the version of Tomcat I was working with (4.1.*),
it didn't use a hard coded constructor, for example:
## myListBean = (java.util.List )
java.beans.Beans (this.getClass().getClassLoader(),
"java.util.List ");
Using reflection to call the constructordid not create
a compile time error. This was good, in any case,
because my JSP is never supposed to instantiate these
beans, they are created by a servlet that forwards the
request to them.
Does anyone know why this new JSP servlet generator
uses this type of constructor? It seems like it would
break A LOT of code out there, where a JPS page uses
the useBean to get a bean that is supposed to already
be existing in the specified scope. Or are we
supposed to only put concrete objects in our class
types, and only those that have a no-arg constructor?
Is there something new in the jsp 2.0 spec that allows
me to define a bean that will never be instantiated in
the page itself?
My workaround is to remove all the jsp:useBean tags
and just use scriptlets to get at the objects.
## <% java.util.List .html>java.util.List java.util.List .java.html>' border=0> myList = (java.util.List .html>java.util.List java.util.List .java.html>' border=0>)
session.getAttribute("myList"); %>
Once again, is there anyway that I can use jsp:useBean
with classes like java.util.List or even classes that
I have written that do not provide a no-arg
constructor?
Thanks for any assistance,
Jason
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