Help in using drools
by Stelarinc
Hi,
I would like to use drools in my application. However, there are a few things that I do not quite understand and whether it can fit my requirements. I have tried to search through the documentation and mailing list, but to no avail.
Here is my situation. I am creating a web-based application which requires me to run certain rules for certain page. What I need is to pass all the information accumulated from the pages and pass it through a rule engine. Each rule will check the information and return string message(s) to the caller. Does drools fit in this requirements?
>From what I understand, I can create a stateful session, passing the information to the rule engine. But when I need to return the result, how do I do that? Do I pass an empty String List into the rule engine, and each rule will add the message to the List if there is an error?
Thank you.
Regards,
Leonard Soetedjo
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18 years
Re: [rules-users] Define a time event
by Christine
> All the above, just to tell you all users that time is not a simple
> concept to support.
With a few limitations, it shouldn't be that difficult. Of course,
re-running a rule base with the same results can't be done if you
incorporate time, but other than that, I don't see the difficulty.
Christine
18 years
Property Navigation
by Alessandro Lazarotti
If I've the simple classes:
public class ObjectBar{ public String name; gets/sets}
public class ObjectFoo{ public ObjectBar bar; gets/sets }
... and ObjectFoo this in WorkingMemory.
It's not possible navigate in objectFoo for make constraint in objectBar?
Example:
rule "Teste"
no-loop true
when
$foo: ObjectFoo(objectBar.name != "foobar")
then
System.out.println($foo);
end
... but:
org.drools.RuntimeDroolsException: Exception executing predicate
org.drools.base.mvel.MVELPredicateExpression@18488ef
Caused by: org.mvel.CompileException: unable to resolve property: nome
Caused by: org.mvel.PropertyAccessException: unable to resolve property:
nome
Thanks
Alessandro Lazarotti
18 years
Replacement not found for ${wsp.name}.
by Vikas Phonsa
Hi Everybody,
I'm a newbie to Drools. I am trying to run BRMS on Websphere 6.1. The
application started up fine with the default settings.
Now I'm trying to use MS SQL Server instead of Derby. I replaced the
DerbyPersistanceManager settings with the following values in the
repository.xml
<PersistenceManager
class="org.apache.jackrabbit.core.persistence.db.SimpleDbPersistenceMana
ger">
<param name="driver"
value="com.microsoft.jdbc.sqlserver.SQLServerDriver"/>
<param name="url"
value="jdbc:microsoft:sqlserver://MyMachine:1433;;DatabaseName=Drools;Se
lectMethod=Cursor;"/>
<param name="schema" value="mssql"/>
<param name="user" value="droolsuser"/>
<param name="password" value="droolspwd"/>
<param name="schemaObjectPrefix" value="${wsp.name}_"/>
<param name="externalBLOBs" value="false"/>
</PersistenceManager>
When I start up the server, I get an exception with message "Replacement
not found for ${wsp.name}."
If I replace "${wsp.name}." with "default_", the application starts up
successfully and tables are created in my database.
Does anybody have a clue?
Thanks in advance for your help.
Vikas
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18 years
Re: [rules-users] Date arithmetic in âwhenâ session
by Christine
Hi,
you shouldn't put part of the "if" or "when" part after the "then". Put
all conditions after the "when" so the rule engine will evaluate them.
I guess you mean to write something like (although I haven't tested this):
rule "ITR Discard"
when
req : LowFareRequest(
$reqTime : requestedDeparture.time)
itr : AirItinerary( discarded == false )
flight : Flight(
departure.time - 2 * 3600000 <
$reqTime,
departure.time + 4 * 3600000 >
$reqTime)
then
System.out.println("discard true");
end
Christine
18 years
Exception while deploying drools-jbrms 4.0.4
by Jonathan Guéhenneux
Hi,
I can't deploy the war drools-jbrms 4.0.4 because I got this error. I'm using apache tomcat 5.5.17 and Eclipse 3.3.2.
java.lang.RuntimeException: Could not create Component: org.jboss.seam.security.identity
at org.jboss.seam.init.Initialization.addComponent(Initialization.java:964)
at org.jboss.seam.init.Initialization.installComponents(Initialization.java:891)
at org.jboss.seam.init.Initialization.init(Initialization.java:547)
at org.jboss.seam.servlet.SeamListener.contextInitialized(SeamListener.java:34)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3729)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4187)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1013)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:718)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1013)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442)
at org.apache.catalina.core.StandardService.start(StandardService.java:450)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:709)
at org.apache.catalina.startup.Catalina.start(Catalina.java:551)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:294)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432)
Caused by: java.lang.NoClassDefFoundError: javax/faces/application/FacesMessage$Severity
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2427)
at java.lang.Class.getDeclaredMethods(Class.java:1791)
at org.jboss.seam.Component.initMembers(Component.java:546)
at org.jboss.seam.Component.<init>(Component.java:254)
at org.jboss.seam.Component.<init>(Component.java:217)
at org.jboss.seam.init.Initialization.addComponent(Initialization.java:949)
... 18 more
It seams there are missing classes, what can I do?
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18 years
Re: [rules-users] Define a time event
by Christine
Talking about date and time, how do I get current date in a when condition?
dagdag
Christine
> Exactly. Also, you need to make sure you "tell the engine" everytime
> your
> Time object change, as well as ensure that fireAllRules will be called at
> the exact time: 22:00, because if it is called 1 minute later or before,
> the
> constraint will evaluate to false.
>
> Edson
>
>
> 2008/5/7 Christine <christine(a)christine.nl>:
>
>> > Hi everyone,
>>
>> > For example:
>> > when Time(hour==22,minute==0) Lamp(status==1)
>> > then
>> > Console.Writeline("It's late,turn off the light and go to bed")
>> > where time is a class that return the current hour;
>>
>> Claudio, this would probably work if you fire the rules every hour or
>> every minute or every time your Time object changes. Just having the
>> rules
>> sitting in your rulebase doesn't mean they get executed.
>>
>> Christine
>>
>>
>> _______________________________________________
>> rules-users mailing list
>> rules-users(a)lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>
>
>
> --
> Edson Tirelli
> JBoss Drools Core Development
> Office: +55 11 3529-6000
> Mobile: +55 11 9287-5646
> JBoss, a division of Red Hat @ www.jboss.com
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
18 years
generic property access
by vadimar
Hi,
I'm considering to use drools. Unfortunately all my WM objects (facts) are
not Java beans. All properties are accessed in generic way (similar to
Properties in java)
T getProperty(String name)
void setProperty(String name, T value)
Is drools relevant for me? How this can be overcome in rule definition?
Thanks,
Vadim
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18 years
generic property access
by Vadim Arshavsky
Hi,
I'm considering to use drools. Unfortunately all my WM objects (facts) are
not Java beans. All properties are accessed in generic way (similar to
Properties in java)
T getProperty(String name)
void setProperty(String name, T value)
Is drools relevant for me? How this can be overcome in rule definition?
Thanks,
Vadim
18 years
Drools-BRMS at jboss-5.0.0.Beta4
by ravi thalupula
Hi All,
How to deploy drools-4.0.4-brms successfully in jboss-5.0.0.Beta4 version?
its working at jboss-4.x.
Any specific changes to need to do at library level?
root cause:
19:44:54,971 INFO [Scanner] scanning:
C:\java\jboss-5.0.0.Beta4\server\default\deploy\drools-jbrms.war\WEB-INF\lib\jboss-seam-2.0.0.CR2.jar
19:44:54,971 WARN [Scanner] could not read entries
java.util.zip.ZipException: The system cannot find the path specified
Thanks in advance.
Ravi Thalupula
18 years
