2:41 p.m.
Hi,
I have been trying to write the following code to automatically deploy any
changes made to the rules. However i am getting nullpointerexception errors.
I see many posts regarding this topic and have tried different options but
the error won;t go away.
public static void main(String[] args) {
try {
FileInputStream file = new
FileInputStream("C:\\Users\\folderabc\\workspace\\Drools
Sample\\bin\\Guvnor.properties");
Properties p = new Properties();
p.load(file);
RuleAgent agent = RuleAgent.newRuleAgent(p); *<-- this is where
it is failing* RuleBase rb = agent.getRuleBase();
WorkingMemory ksession = rb.newStatefulSession();
Car c = new Car("yellow", 2100);
Driver d = new Driver("Isha", 18, c, "lets try it" );
ksession.insert(d);
ksession.fireAllRules();
//logger.close();
} catch (Throwable t) {
t.printStackTrace();
}
}
/Here are the errors i am getting on my console:/
java.lang.NullPointerException
at org.drools.agent.RuleAgent.refreshRuleBase(RuleAgent.java:384)
at org.drools.agent.RuleAgent.configure(RuleAgent.java:368)
at org.drools.agent.RuleAgent.init(RuleAgent.java:268)
at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:208)
at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:168)
at kijanowski.GuvnorTest.main(GuvnorTest.java:43)
Any help will be greatly appreciated. Thank you
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4:49 p.m.
Which version are you using?
The RuleAgent is not part of the public API and has not been developed for
some time..
could you please use the KnowledgeAgent instead (see section 3.2.6 in the
manual),
and let us know if you still have problems?
Thanks
Davide
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12:28 p.m.
Hi, Thank you for your response...
So i have 2 methods readKnowledgeBase() and the main method. Both are
provided below. When i run the main method i get "Unable to parse ChangeSet"
error and java.io.FileNotFoundException the url specified in the
change-set.xml file.
I am not able to understand how to fix changeSet error. i have place the
package url in the change-set.xml. do i need to save this file somewhere???
Please Help!!!
public static void main(String[] args) {
try {
KnowledgeBase kbase = readKnowledgeBase();
StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
Driver d = new Driver("Isha", 18, null, "lets try it" );
ksession.insert(d);
ksession.fireAllRules();
} catch (Throwable t) {
t.printStackTrace();
}
}
private static KnowledgeBase readKnowledgeBase() throws Exception {
ResourceChangeNotifier notifier =
ResourceFactory.getResourceChangeNotifierService();
ResourceChangeScanner scannerService =
ResourceFactory.getResourceChangeScannerService();
notifier.start();
scannerService.start();
KnowledgeAgentConfiguration kaconf =
KnowledgeAgentFactory.newKnowledgeAgentConfiguration();
kaconf.setProperty("drools.agent.scanDirectories", "false");
KnowledgeAgent kagent = KnowledgeAgentFactory.newKnowledgeAgent("MyAgent",
kaconf);
kagent.applyChangeSet(ResourceFactory.newUrlResource("http://localhost:8080/guvnor-5.5.0.Final-jboss-as-7.0/org.drools-guvnor/org.drools.guvnor.Guvnor/package/TestIsha/LATEST"));
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
return kbase;
}
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Davide Sottara -
IPatel