Re: [rules-users] java.lang.ClassCastException: java.lang.String cannot be cast to com.sample.DroolsTest$Message
You cannot cast an object of type java.lang.String (i.e.
$a as it is bound to "add") to Message.
Apparently you have not understood how "from" works.
(Its various forms are described in the "Expert" manual.)
Most frequently, it is used to "pull" one or more objects,
one at a time, from a fact, in order to permit them to
match a pattern although they have not been inserted
in Working Memory.
What I see in this rule doesn't indicate what you might
have intended to do - so I cannot propose an improved
version.
-W
On 19/01/2012, Veera <veera.se(a)gmail.com> wrote:
Hi All,
Can anybody tell me what is the problem here ..
i have a 2 classes:
person(i have a field in this :java.lang.String
add)
Message(i have a filed in this :java.lang.String
name)
rule "H"
when
person( $a : add )
Message ( name == "tree" ) from $a
then
# System.out.println("in H rule");
when i compile this rule i am getting below exception...
java.lang.ClassCastException: java.lang.String cannot be cast to
com.sample.DroolsTest$Message
Thanks in Advance....
Veeras
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