Oracle Business Rule Exception during deployment

Question

Hi Experts,
We implemented the OBR(Oracle Business Rules) within CEP and I always encounter a strange behavior. For some reason, I always encounter this error:
Apr 8, 2011 3:15:10 PM oracle.rules.rl.RuleSession logIt
SEVERE: symbol 'oracle.rules.rl.xpath.Step' is undefined
at line 1 column 12 in main
Apr 8, 2011 3:15:10 PM oracle.rules.rl.RuleSession logIt
SEVERE: UndefinedException: symbol 'oracle.rules.rl.xpath.Step' is undefined
at line 1 column 12 in main
Apr 8, 2011 3:15:10 PM oracle.rules.rl.RuleSession logIt
SEVERE: symbol 'oracle.rules.rl.xpath.Step' is undefined
at line 1 column 12 in main
Apr 8, 2011 3:15:10 PM oracle.rules.rl.RuleSession logIt
SEVERE: UndefinedException: symbol 'oracle.rules.rl.xpath.Step' is undefined
at line 1 column 12 in main
<Apr 8, 2011 3:15:10 PM PHT> <Error> <com.nsn.cvo.ingestion.callscenario.bean.OBRExecuteBean> <BEA-000000> <oracle.rules.sdk2.exception.SDKException: RUL-05187: error getting a rule session from decision point rule session pool.
>
After restarting CEP, OBR is running perfectly. I am not sure how to resolve this issue and need your guidance on how to prevent this from happening. My java source source code is below: The initializeDecisionEngine is called only once. My input to OBR is a java.util.Map(this is a requirement and can't do anything about it).
private String rulesPath;
private RuleDictionary ruleDictionary;
private DecisionPointInstance decisionPointInstance;
private String decisionFunctionName = "decisionFunctionName";
private void initializeDecisionEngine() {
          try {
               if (rulesPath == null) {
                    return;
               if (decisionPointInstance == null) {
                    ruleDictionary = this.loadRuleDictionary(rulesPath);
                    DecisionPoint decisionPoint = new DecisionPointBuilder().with(
                              decisionFunctionName).with(ruleDictionary).build();
                    decisionPointInstance = decisionPoint.getInstance();
                    System.out.println("INIT() OUT");
          } catch (SDKException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
private RuleDictionary loadRuleDictionary(String path) {
          System.out.println("loading dictionary from path: " + path);
          RuleDictionary dict = null;
          Reader reader = null;
          try {
               reader = new FileReader(new File(path));
dict = RuleDictionary.readDictionary(reader, new DecisionPointDictionaryFinder(null));
               List<SDKWarning> warnings = new ArrayList<SDKWarning>();
               dict.update(warnings);
               if (warnings.size() > 0) {
                    log.error("Validation warnings: " + warnings);
          } catch (SDKException e) {
               log.error(e);
          } catch (FileNotFoundException e) {
               log.error(e);
          } catch (IOException e) {
          } finally {
               if (reader != null) {
                    try {
                         reader.close();
                    } catch (IOException ioe) {
                         ioe.printStackTrace();
          return dict;
private executeOBRRule(){
Map<String, String> mapEntry = new HashMap<String, String>();
mapEntry.put("column1", "value1");
mapEntry.put("column2", "value2");
mapEntry.put("column3", "value3");
if (decisionPointInstance != null) {
               decisionPointInstance.clearInputs();
               // decisionPointInstance.
               List<Object> list = new ArrayList<Object>();
               list.add(mapEntry); <--- Adding the map to a list since it is the only allowed input for OBR, or is there any other way other than list? -->
               decisionPointInstance.setInputs(list);
Object obj = decisionPointInstance.invoke();  <<<<<< this is where the exception is raised.
My question is that why is the exception is being raised and sometimes it is not. My only resolution is to restart CEP server. Am I missing something? My obr rule file is ok since it does not display any error during compilation. If you can guide me to the correct path, I will really appreciate it.
Regards,
Russel

Answer 1

Is this problem resolved?
If so it would be greatly helpful if you could provide the solution.
Regards,
Nigel.