The rule you have shown is not capable of producing that error message. Which version of Drools are you using? (1) You cannot use "=" (in: MyEvent(prop1="XYZ") to compare two values. (2) You cannot use "matches" in eval, where Java expressions are expected (in: eval((prop3 matches ...). (3) You must use one argument for a call to count (in: accumulate(..., count())), even though this argument does not matter. (4) You should not use eval where it is not necessary. (5) Your must use correct regular expressions, there is an error in: matches ("MatchOne|MatchTwo){1}::"+... and also in: matches "(second|Third{1}_CONNECT". (6) It is highly unusual to use a repeat count of 1 for a subpattern in a regular expression. Anyway, below is a correct version of the LHS *except for the patterns, *where I don't know what you really need to match. Moreover, I urgently suggest that you - DO NOT post the same question twice within 24 hours. Cleaning up the mess takes time. - Read the Drools Expert documentation before you write rules. - Start with simple conditions and test that they work. - Read the Drools Expert documentation. - Build and test more complex patterns once simple patterns work as expected. - Read the Java documentation on regular expressions. The following code has been compiled successfully using Drools 5.1.1, but some regular expressions contain errors, which will throw an exception at runtime. declare MyEvent @role( event ) prop1 : String prop2 : int prop3 : String end function String getFirstNameRegex(){ return "blah"; } function String getMMSCNameRegex(){ return "gaga"; } function String getServerID(){ return "R2D2"; } function int getNodeCount(){ return 20; } function int getConnectionCount(){ return 20; } function int getThirdNodeCount(){ return 20; } rule "or-or-or" when MyEvent(prop1 == "XYZ") over window:time(1m) from entry-point MyStream or ( MyEvent() over window:time(1m) from entry-point MyStream and Number($i1 : doubleValue > (getNodeCount()*0.35) ) from accumulate( MyEvent( prop1 == "CONNECT", prop2 == 3, prop3 matches ("match " + getFirstNameRegex() + " Connect") ) over window:time(1m) from entry-point MyStream, count(1) ) ) or ( MyEvent() over window:time(1m) from entry-point MyStream and Number($i2 : doubleValue > (getConnectionCount()*0.4) ) from accumulate( MyEvent( prop1 matches "(second|Third{1}_CONNECT", prop2 == 1, prop3 matches ("MatchOne|MatchTwo){1}::" + getMMSCNameRegex()+", failure") ) over window:time(1m) from entry-point MyStream, count(1) ) ) or ( MyEvent() over window:time(1m) from entry-point MyStream and Number($i3 : doubleValue > (getThirdNodeCount()*0.5) ) from accumulate( MyEvent( prop1 matches "(E1|E2){1}_CONNECT", prop2 == 3, prop3 matches ("REPT (one|five|seven){1}::" + getServerID()+" is down") ) over window:time(1m) from entry-point MyStream, count(1) ) ) then System.out.println( "match" ); end -W On 28 January 2011 07:08, Ayush <ayush.vatsyayan(a)alcatel-lucent.com&gt;wrote: > > > When I'm trying to execute multiple evals I'm getting errors. Below is > what > I'm trying to do > > MyEvent(prop1="XYZ") over window:time(1m) from entry-point > MyStream > or > (MyEvent() over window:time(1m) from entry-point MyStream > and > Number($i1 : doubleValue) > from accumulate( > MyEvent( > prop1 == "CONNECT", > prop2 == 3, > eval((prop3 matches ("match "+getFirstNameRegex()+" > Connect")) == true) > ) over window:time(1m) from entry-point MyStream, > count() > ) > and > eval($i1 > getNodeCount()*0.35)) > or > (MyEvent() over window:time(1m) from entry-point MyStream > and > Number($i2 : doubleValue) > from accumulate( > MyEvent( > prop1 matches "(second|Third{1}_CONNECT", > prop2 == 1, > eval((prop3 matches > ("MatchOne|MatchTwo){1}::"+getMMSCNameRegex()+", failure")) == true) > ) over window:time(1m) from entry-point MyStream, > count() > ) > and > eval($i2 > getConnectionCount()*0.4)) > or > (MyEvent() over window:time(1m) from entry-point MyStream > and > Number($i3 : doubleValue) > from accumulate( > MyEvent( > prop1 matches "(E1|E2){1}_CONNECT", > prop2 == 3, > eval((prop3 matches ("REPT (one|five|seven){1}:: > "+getServerID()+" is down")) == true) > ) over window:time(1m) from entry-point MyStream, > count() > ) > and > eval($i3 > getThirdNodeCount()*0.5)) > > When I'm trying to execute the above LHS I get > org.drools.rule.InvalidPatternException: Required Declarations not bound: > '$i1'. > > I even tried using below approach > > AlertReceivedEvent() over window:time(1m) from entry-point > NotificationStream > > $I1 : Double() from getIsgNodeCount() > > Number(doubleValue > $I1) from accumulate( > AlertReceivedEvent( > entity == "NPMMS_NE_CONNECT", > probableCause == 3, > eval((specificProblems matches ("REPT ISG > NPMMS::Unable to connect to "+getPxmmsNameRegex()+" node: PXMMS")) == > true) > ) over window:time(1m) from entry-point > NotificationStream, count() > ) > > > But when I'm placing parentheses () around it, it throws exception stating > mismatched input '$I1' expecting ')' in rule. For now I'd placed these 3 > statements in separate rules. Can anyone please help me solving it? > Thanks > in advance. > -- > View this message in context: > http://drools-java-rules-engine.46999.n3.nabble.com/Problem-implementing-... > Sent from the Drools - User mailing list archive at Nabble.com. > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users >