I did a quick search in the mailing list, but couldn't find a related issue.
The following rule worked fine in 5.3.0.CR1 (and earlier)
...
when
$party : ImmutableParty(addresses == null || addresses.size() == 0)
then
...
ImmutableParty has a getter for addresses and addresses is a collection.
When upgrading to 5.3.0.Final, I get this error:
Caused by: java.lang.RuntimeException: Predicate 'addresses == null ||
addresses.size() == 0' must be a Boolean expression
[Line: 17, Column: 32] : [Rule name='party - address - at least one']
This is with mvel 2.1 beta 6.
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