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 at 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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>
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>
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--
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Esteban Aliverti
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