Hi, if you write a file in a source folder, it doesn't mean you can immediately access it through the classLoader...Eclipse will put your resource in the  classpath when it refreshes the project (e.g. the next time you start the application). This is why you don't get the resource immediately.
If you need that kind of flexibility (write and read a file on the same Thread), you should write on a temporary dir of your project and read from there. To do a better job, i suggest the process of creating the .drl from the .brl should be separated (e.g. compile-time, when you build your project, with maven or ant) . That way, you will always have access to the .drl thtough the class loader.

Regards.

2010/6/15 Fnu Mahalakshmi <FMahalakshmi@nyx.com>

Hi,

 

When I run my project – I have brl and drl rule files.

When I run it for the first time: I am converting brl to drl files.

I get this error

 

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:87)

      at com.org.RuleRunner.loadRules(RuleRunner.java:44)

      at com.org.RuleRunner.runStatelessRules(RuleRunner.java:108)

      at com.org.RulesTest.main(RulesTest.java:40)

 

 

But after I run it for the first time and the rule.drl (converted file from brl to drl) exists in my directory – I run it again and then the program runs fine.

 

So number of .brl files that many number of exceptions(same as above) and then program runs.

 

Why is this happening?? Should it not create the file and load it into the rulebase?

 

My code for converting from brl to drl is :

       try{

                  BRXMLPersistence read = (BRXMLPersistence) BRXMLPersistence.getInstance();

                  BRDRLPersistence write = (BRDRLPersistence) BRDRLPersistence.getInstance();

                  brl = FileUtils.readFileToString(file);

                System.out.println("File content: " + brl);

                outputDRL = write.marshal(read.unmarshal(brl));

                String drlFilePath = "src/main/rules"+rulesFiles +".drl";

                System.out.println("drlFilePath "+drlFilePath +"rulesFiles "+rulesFiles);

                String path = rulesFiles+".drl";

                System.out.println("path "+path);

                System.out.println("drlfile "+drlFilePath);

                drlFile = new File(drlFilePath);

                FileUtils.writeStringToFile(drlFile, outputDRL);

 

                Reader source = new InputStreamReader( RuleRunner.class.getResourceAsStream(path) ); // error is here

                addRulesToThisPackage.addPackageFromDrl(source);

            }catch (IOException e) {

 

                  e.printStackTrace();

             }

      }

 

Any idea why this problem?? Is there some error in my code above????

 

Please help.

Thank you

M






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