[rules-users] Drools parser error accessing ArrayList.
Wolfgang Laun
wolfgang.laun at gmail.com
Wed Apr 11 11:21:18 EDT 2012
A rather debatable feature has been added: the automatic insertion of
semicolons in MVEL code. The problem surfaces in several constellations
where the naive algorithm thinks that a semicolon should be inserted, e.g.,
after the closing parenthesis of any structured statement (such as "for",
"while", "switch") whenever there is no opening brace following *on the
same line*.
This feature ought to be off-turnable!
-W
On 11 April 2012 16:51, groovenarula <gnarula1 at la-z-boy.com> wrote:
> Hi,
>
> I have a situation where I need to iterate over an ArrayList in the RHS of
> a
> rule. The ArrayList is created in the LHS of the rule as follows :
>
> rule "Hello World"
> dialect "mvel"
> when
> $cur : Message()
> $others : ArrayList ( size > 0 ) from
> collect(Message(status ==
> $cur.status, this != $cur ))
> then
> for ( int ctr = 0; ctr < $others.size(); ctr++)
> {
> System.out.println((Message) $others.get(ctr));
> }
> end
>
> This works in Drools 5.1.1.
>
> However it gives the following parser error in Drools 5.2.X :
>
> Unable to Analyse Expression for ( int ctr = 0; ctr < $others.size();
> ctr++);
> {
> System.out.println((Message) $others.get(ctr));
> } ;:
> [Error: was expecting type: java.lang.Object; but found type:
> <Unknown>]
> [Near : {... for ( int ctr = 0; ctr < $othe ....}]
> ^
> [Line: 6, Column: 0] : [Rule name='Hello World']
>
> java.lang.IllegalArgumentException: Could not parse knowledge.
> at com.sample.DroolsTest.readKnowledgeBase(DroolsTest.java:50)
> at com.sample.DroolsTest.main(DroolsTest.java:23)
>
> What am I missing here ? Any insight on a possible solution is appreciated.
> This has become a big stumbling block for us to move from 5.1.1 to 5.2.1.
>
> Thanks in advance,
> Gurvinder
>
>
>
> --
> View this message in context:
> http://drools.46999.n3.nabble.com/Drools-parser-error-accessing-ArrayList-tp3902766p3902766.html
> Sent from the Drools: User forum mailing list archive at Nabble.com.
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.jboss.org/pipermail/rules-users/attachments/20120411/d351033c/attachment.html
More information about the rules-users
mailing list