Again? You posted a similar problem some days ago. The stacktrace you have posted doesn't involve any drools' class. Did you try to debug your code? According to the error, I'm 90% sure that ruleSource is null.
Please, try to debug or try different solutions before posting here. What you have here is a basic java error. 

Best,

2010/6/16 Fnu Mahalakshmi <FMahalakshmi@nyx.com>

Hi guys,

 

I am trying to create a very basic dsl which is giving me the following error stack:

 

The code to add the dsl is as follows:

 

InputStream ruleSource = RuleRunner.class.getClassLoader().getResourceAsStream("/Rule1.dslr");

InputStream dslSource = RuleRunner.class.getClassLoader().getResourceAsStream("/sample-dsl.dsl");

          

            //Load the rules , using DSL

            addRulesToThisPackage.addPackageFromDrl(

                        new InputStreamReader(ruleSource),

                        new InputStreamReader(dslSource));

 

I have both the sample-dsl .dsl and Rule1.dslr in my working directory.

 

Error encountered at adding the dsl to the package (last line)

 

Error stack:

Exception in thread "main" java.lang.NullPointerException

      at java.io.Reader.<init>(Unknown Source)

      at java.io.InputStreamReader.<init>(Unknown Source)

      at com.org.RuleRunner.loadRuleFile(RuleRunner.java:96)

      at com.org.RuleRunner.loadRules(RuleRunner.java:48)

      at com.org.RuleRunner.runStatelessRules(RuleRunner.java:109)

      at com.org.RulesTest.main(RulesTest.java:41)

 

my dsl file has basic mapping as per the online documentations.

 

The dsl rule I created is:

expander sample-dsl.dsl

 

rule "A status changes B status"

      when

            There is an A

-        has an address

There is a B

      - has name

      then

            - print updated A and Aaddress

End

 

 

I have created DSL in eclipse.

 

Is the code I added for it to be loaded to my package correct?? Or am I missing something????

 

 

Please help.

 

Thanks.

M

 






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