February 2007 - rules-users - Jboss List Archives

Need Help: Errors while running FibonacciExample

by venkatesh devalapura nagabhushana

Hi, After successfully compiling the example code FibnacciExample.java, I tried to run it, I get the following error, let me know how to solve it: java FibonacciExample Exception in thread "main" java.lang.ExceptionInInitializerError at java.lang.Class.initializeClass() (/usr/lib/libgcj.so.6.0.0) at org.drools.semantics.java.RuleBuilder.<clinit>() (Unknown Source) at java.lang.Class.initializeClass() (/usr/lib/libgcj.so.6.0.0) at org.drools.compiler.PackageBuilder.addRule(org.drools.lang.descr.RuleDescr) (Unknown Source) at org.drools.compiler.PackageBuilder.addPackage(org.drools.lang.descr.PackageDescr) (Unknown Source) at org.drools.compiler.PackageBuilder.addPackageFromDrl(java.io.Reader) (Unknown Source) at FibonacciExample.main(java.lang.String[]) (Unknown Source) at gnu.java.lang.MainThread.call_main() (/usr/lib/libgcj.so.6.0.0) at gnu.java.lang.MainThread.run() (/usr/lib/libgcj.so.6.0.0) Caused by: java.util.regex.PatternSyntaxException: At position 2 in regular expression pattern: expected end of character class (.*)\bmodify\s*\(([^)]+)\)(.*) ^ at java.util.regex.Pattern.Pattern(java.lang.String, int) (/usr/lib/libgcj.so.6.0.0) at java.util.regex.Pattern.compile(java.lang.String, int) (/usr/lib/libgcj.so.6.0.0) at org.drools.semantics.java.KnowledgeHelperFixer.<clinit>() (Unknown Source) at java.lang.Class.initializeClass() (/usr/lib/libgcj.so.6.0.0) ...8 more Is it require to place .drl file in the same directory as that of the source code ? Thanks, Venkatesh The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately and destroy all copies of this message and any attachments. WARNING: Computer viruses can be transmitted via email. The recipient should check this email and any attachments for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by this email. www.wipro.com

18 years, 8 months

4
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Recursive Running While Using assertLogical()

by Micheal John

18 years, 10 months

2
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DSL - Calling Java Method , Eval functions

by kingston

Is it possible to write a rule in DSL to check for a value that is returned by a calls to a java method in the Condition part ? Are there any sample codes for using eval in DSL Syntax or for calling java methods ? -- View this message in context: http://www.nabble.com/DSL---Calling-Java-Method-%2C-Eval-functions-tf3307... Sent from the drools - user mailing list archive at Nabble.com.

19 years

3
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can we get the output from getters for two asserted objects using DSL method in drools rules

by vijay nooka

hi, i am setting two inputs through setters and asserting the corresponding objects in to working memory. after firing the rules the error message is setting in a setters method of Errorlist class,when i try to retrieve those err mssges through getters..i am getting only one error message and the other message is Null..i need to print two error messages for two asserted objects..can u plz help in this... Thanks vijay -- View this message in context: http://www.nabble.com/can-we-get-the-output-from-getters-for-two-asserted... Sent from the drools - user mailing list archive at Nabble.com.

19 years

3
2
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PropertyChangeListeners vs. modify()

by Dirk Bergstrom

Reading through the sources, it looks like property change listeners simply end up calling modify(). This implies that you're better off not using them if you'll be changing more than one property at a time, since you'll just be calling modify() a bunch of times. Better to change all the properties, then call modify() once. Is this a fair reading, or am I missing something? -- Dirk Bergstrom dirk(a)juniper.net _____________________________________________ Juniper Networks Inc., Computer Geek Tel: 408.745.3182 Fax: 408.745.8905

19 years

4
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retracting a fact after all interested rules have fired??

by Justine Hlista

Need some instruction for retraction strategies. We have an application that receives messages about the status of various things in the system, and at the moment I am asserting these messages as facts. The rules are written against these messages. Various rules might be interested in various values in the message, and they all fire independently. The problem is that after all the existing rules that are interested in the message have fired, I want to retract the message. How do I ensure that all the interested rules have fired first?? At the moment, I am trying to use a salience value of -1 to make sure a simple "cleanup" rule fires last: rule "cleanupMessage" no-loop true salience -1 when msg : MyMessage() then retract(msg) end Does this sound like a reasonable solution? Is there a better one?? Thanks!

19 years

3
2
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Converting this DRL into a Decision Table

by Vargas, Michael E

Hi, I'm currently trying to convert this Rules into a Decision Table: rule "JobLevel" when p : Person( status == Person.NOTRUN, age == "27", person) then System.out.println(p.getJobLevel()); p.setJobLevel("You're a rookie"); p.setStatus(Person.RUN); modify(p); System.out.println(p.getJobLevel()); end The thing I can't seem to figure out is how to bind the p variable to an object person. Any help would be much appreciated!! Regards, Michael Vargas

19 years

2
1
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Newbie: Is this feasible w/ Drools?

by Alexander Richter

Hello, I work in a bioinformatics group and we're interested in using Drools for setting up an assertion engine for biological processes. We have over 300 genomes ( == sets of facts), each with upwards of 10K genes/features with annotations ( == facts). We want to be able to predict whether various biological processes exist, based on presence of the annotated genes that are the components of the process. Asserted processes are not black and white; we may have various levels of certainty, based on the percentage of component genes found (because we can't be certain that not finding a certain annotation means the the gene isn't in the genome -- it could mean that we just didn't find it). In addition, processes tend to be composed of sub-processes. The assertions then get used to make additional annotations on the features, which we then use to help us look for missing components. Therefore, we need to be able to display the decisions that led to a specific assertion, as well as the features that went into the component assertions. In addition, we regularly add new processes, as we get new ways to annotate genes, or read about newly worked-out processes. We really don't want to have to run all rules against all the genomes every time we add a new rule, but just add that rule. We would like to define the actual rules for the assertions in Drools, but don't know how we would do certain parts. 1) Can one walk through the rule hierarchy from a given rule and tease out the hierarchy of rules and the facts that went into that rule? 2) Is it possible to add a rule, or set of interacting rules, and have them incrementally evaluated, instead of forcing full evaluation? Alternatively, can the rulesets be individually defined and run in such a way that they interact? Thanks, Alexander Richter

19 years

4
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RuleBaseImpl Error - Help needed

by kingston

Hi, I am a beginner. I am using DSL Syntax. I get errrors like org.drools.rule.InvalidRulePackage: unknown:7:48 mismatched token: [@16,48:49='&&',<55>,1:48]; expecting type ')' unknown:8:0 Unable to expand: ;. Due to Expression was not expandable: at org.drools.rule.Package.checkValidity(Unknown Source) at org.drools.reteoo.RuleBaseImpl.addPackage(Unknown Source) at student.DroolsStudent.main(DroolsStudent.java:50) Where can i get the API documentation for RuleBaseImpl classs and other classes like WorkingMemoryImpl ? Are there any sets of DO's and DONT's to be followed frame rules in DSL Syntax ? -- View this message in context: http://www.nabble.com/RuleBaseImpl-Error---Help-needed-tf3308727.html#a92... Sent from the drools - user mailing list archive at Nabble.com.

19 years

2
1
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Salience Problem

by Micheal John

19 years

2
1
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rules-users February 2007