How to Use Stateless Session in Drools 6.2.0

[Ashish Soni]

I am not sure how can i use the Stateless session when using Drools 6.2.0 as there is no good documentation i have placed my empty kmodule inside META-INF and my DRL rule file is inside  my package com.test.sample and when i run this outside of eclipse it gives below error

5/07/15 14:57:46 INFO scheduler.TaskSetManager: Lost task 10.1 in stage 0.0 (TID 11) on executor 10.200.37.158: java.lang.RuntimeException (Error while creating KieBase[Message [id=1, level=ERROR, path=org/drools/compiler/lang/dsl/rule1.drl, line=3, column=0
   text=[ERR 107] Line 3:0 mismatched input 'expander' expecting one of the following tokens: '[package, import, global, declare, function, rule, query]'.], Message [id=2, level=ERROR, path=org/drools/compiler/lang/dsl/rule1.drl, line=8, column=0
   text=[ERR 102] Line 8:13 mismatched input '1' in rule "new rule"], Message [id=3, level=ERROR, path=org/drools/compiler/lang/dsl/rule1.drl, line=0, column=0
   text=Parser returned a null Package]]) [duplicate 1]

[Ashish Soni]

Any one can explain as i have tried all the possible combination and done everything as per the documentation but still i get an error

java.lang.RuntimeException: Cannot find a default StatelessKieSession

Ashish

[Mark Proctor]

You're drl is not compiling, so the ksession cannot be built and thus cannot be found.

Mark

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[Andreas Razmyslov]

Hallo Ashish,

i'm using Drools 6.5.0 for one of my projects and have exactly the same problem. Were you able to solve it?

Greetings
Andreas

[Oleksandr Lytvyn]

Hey guys,

I have exactly the same issue as you. If I run the project from Eclipse, it works. Once I package a jar file (I tried tons of different ways to package) and run it as "java -jar ...", I get this "mismatched input '1' in rule "new rule"" error.

Were you able to solve it?

Thank you,

Olek

[Parveen Chhikara]

@Lytvyn - I am facing the same behaviour. It is working fine in eclipse but not with jar. Please let me know if you find any solution. 

[Dmitry Antonov]

Had the same issue with 7.1 - while debugging or packaging into separate jar's all works ok, but as soon as I packaged into a single jar with embedded dependencies, started getting the issue as in the original post.

I think it's caused by this file /org/drools/compiler/lang/dsl/rule1.drl which gets automatically picked up by the drools compiler.

As a workaround I've set packages property of kbase in kmodule.xml to point to my .drl location (note that's a path, not package name) as <kbase name="KBase1" default="true" eventProcessingMode="stream" equalsBehavior="equality" packages="org.package.folder">, now the dummy .drl gets filtered out. Before I had .drl in the resources folder and it was working fine automagically, however in order to make this work I had to move .drl out and tweak pom.xml with custom resources declarations. Now I like it even better than before, the packages attribute gives some flexibility.

As a side note, it seems to me that rule1.drl file shouldn't be included in the drools compiler package, however I'm just starting with drools and not 100% sure, its content is quite meaningless though.

~Dmitry