[rules-users] Getting Null pointer exception for applying change set

[Michael Anstis]

Any particular place you get the NPE?

Is variable "url" null?

On 14 August 2012 16:18, Rana <ven12344 at yahoo.com> wrote:

> Having trouble getting the URL, getting null when getting the ChangeSet
> file.
> Please let me know what is the problem.
>
>
> ResourceChangeScannerConfiguration conf =
>
> ResourceFactory.getResourceChangeScannerService().newResourceChangeScannerConfiguration();
>                 conf.setProperty("drools.resource.scanner.interval", "60");
>                 log.info("Drools Resource Scanner is set to 60 seconds");
>
> ResourceFactory.getResourceChangeScannerService().configure(conf);
>                 ResourceFactory.getResourceChangeScannerService().start();
>                 log.info("Drools Resource Change Scanner Service has
> started");
>                 ResourceFactory.getResourceChangeNotifierService().start();
>                 log.info("Drools Resource Change Notifier Service has
> started");
>
>                 URL url =
> this.getClass().getResource("/src/main/resources/DroolsChangeSet.xml");
>                 URLClassLoader customURLClassloader = new
> URLClassLoader(new URL[]
> {url }, this.getClass().getClassLoader());
>                 KnowledgeBuilderConfiguration kbuilderConfig =
> KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration(null,
> customURLClassloader);
> //              KnowledgeBuilder kbuilder =
> KnowledgeBuilderFactory.newKnowledgeBuilder(kbuilderConfig);
>                 KnowledgeBaseConfiguration kbaseConfig =
> KnowledgeBaseFactory.newKnowledgeBaseConfiguration(null,
> customURLClassloader);
>                 kbaseConfig.setOption( EventProcessingOption.STREAM );
>                 kbaseConfig.setOption( MultithreadEvaluationOption.YES );
> //              kbaseConfig.setOption( MaxThreadsOption.get(2) );
>                 kbase = KnowledgeBaseFactory.newKnowledgeBase(kbaseConfig);
>
>                 // create a knowledge agent
>                 KnowledgeAgentConfiguration aconf =
> KnowledgeAgentFactory.newKnowledgeAgentConfiguration();
>                 aconf.setProperty("drools.agent.scanDirectories", "true");
>                 aconf.setProperty("drools.agent.newInstance", "false");
> //              KnowledgeAgent kAgent =
> KnowledgeAgentFactory.newKnowledgeAgent("Drools Knowledge Agent", null,
> aconf);
>                 KnowledgeAgent kagent =
> KnowledgeAgentFactory.newKnowledgeAgent("Drools Knowledge Agent", kbase,
> aconf, kbuilderConfig);
>                 kagent.applyChangeSet(ResourceFactory.newUrlResource(url));
>                 log.info("Knowledge Agent Created for all the Drools
> Files");
>
>             // load up the knowledge base
>             kbase = kagent.getKnowledgeBase();
>
> Thanks.
>
>
>
> --
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