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... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

But 'wow - we've spent several hours trying to resolve this on our own. And we did not want to post before we confirmed that we've taking care of all the obvious..

But seriously - someone is advocating that MVEL use an 'algorithm' to add semicolons to the code - I don't know if that's such a good idea - IMHO, it's going create more frustrating situations like these than it's going to solve. Just my opinion though.....

laune, Unfortunately, the earlier test worked when I set the dialect to "java". It does not work when it's set to "mvel". When the rule is written as follows : rule "Hello World" dialect "mvel" when $cur : Message() $others : ArrayList ( size > 0 ) from collect(Message( status == Message.HELLO )) then for ( int ctr = 0; ctr < $others.size(); ctr++ ) { System.out.println("Got message : " + (Message) others.get(i)); } end I am now getting the following error : Unable to Analyse Expression for ( int ctr = 0; ctr < $others.size(); ctr++ ) { System.out.println("Got message : " + (Message) others.get(i)); } ;: [Error: unable to resolve method using strict-mode: org.drools.spi.KnowledgeHelper.$others()] [Near : {... int ctr = 0; ctr < $others.size(); ctr++ ) { ....}] ^ [Line: 7, 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) It looks like for some reason, the parser is unable to decipher the $other. Any insight into what could cause this ? Thanks in advance, Gurvinder -- View this message in context: http://drools.46999.n3.nabble.com/Drools-parser-error-accessing-ArrayList... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users