[rules-users] adding process to an empty rule base

[Kris Verlaenen]

This error is caused by a mismatch between the version of the mvel library 
you are using and the version that is expected by drools.
Drools 4.0.0 is expecting mvel14-1.2rc1.jar.  Previous versions of drools 
are probably based on older versions of mvel.
Might also be caused by having multiple versions of mvel in your classpath.

Kris

----- Original Message ----- 
From: "hypnosat7" <ablarbi at yahoo.fr>
To: <rules-users at lists.jboss.org>
Sent: Friday, July 27, 2007 5:30 PM
Subject: Re: [rules-users] adding process to an empty rule base


>
>
> I try this:
> ...
> InputStream stream =
> getClass().getResourceAsStream("/rules/demoRuleFlow.rfm");
> Reader ruleFlowReader = new InputStreamReader(stream);
> ruleEngine.setRuleFlow(ruleFlowReader);
> ..
>
> PackageBuilder builder = new PackageBuilder();
> builder.addRuleFlow(ruleFlow);
> Package pkgRuleFlow = builder.getPackage();
> ruleBase.addPackage(pkgRuleFlow);
>
> but I have this error:
> Caused by: java.lang.NoSuchMethodError:
> org.mvel.optimizers.OptimizerFactory.setDefaultOptimizer(Ljava/lang/String;)V
> at
> org.drools.rule.builder.dialect.mvel.MVELDialect.init(MVELDialect.java:132)
> at org.drools.compiler.DialectRegistry.initAll(DialectRegistry.java:49)
> at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:139)
> at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:88)
>
>
>
> Kris Verlaenen wrote:
>>
>> Yes, that is possible, but you should also add the (generated) package of
>> your PackageBuilder.
>>
>> But this process is actually much simpler when using the ProcessBuilder
>> exclusively.
>> It should look something like this:
>>
>> PackageBuilder builder = new PackageBuilder();
>> // add your rules (if any)
>> builder.addPackageFromDrl( ... );
>> // add your processes (if any)
>> builder.addRuleFlow( ... );
>> // add Package to ruleBase
>> Package pkg = builder.getPackage(); // this includes all the rules and
>> processes
>> ruleBase.addPackage( pkg );
>>
>> Kris
>>
>> ----- Original Message ----- 
>> From: "hypnosat7" <ablarbi at yahoo.fr>
>> To: <rules-users at lists.jboss.org>
>> Sent: Friday, July 27, 2007 3:59 PM
>> Subject: [rules-users] adding process to an empty rule base
>>
>>
>>>
>>> Is it possible to set the rule flow in my rule base before adding rule
>>> packages :
>>>
>>> ruleBase = RuleBaseFactory.newRuleBase();
>>> org.drools.compiler.ProcessBuilder processBuilder = new
>>> ProcessBuilder(new
>>> PackageBuilder());
>>> processBuilder.addProcessFromFile(ruleFlow);
>>> ruleBase.addProcess(processBuilder.getProcesses()[0]);
>>>
>>> thanks
>>> -- 
>>> View this message in context:
>>> http://www.nabble.com/adding-process-to-an-empty-rule-base-tf4157978.html#a11829714
>>> Sent from the drools - user mailing list archive at Nabble.com.
>>>
>>> _______________________________________________
>>> rules-users mailing list
>>> rules-users at lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>> _______________________________________________
>> rules-users mailing list
>> rules-users at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>>
>
> -- 
> View this message in context: 
> http://www.nabble.com/adding-process-to-an-empty-rule-base-tf4157978.html#a11831502
> Sent from the drools - user mailing list archive at Nabble.com.
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users