[jboss-jira] [JBoss JIRA] (JBRULES-2402) Null Pointer exception while loading and executing two serialized rules which are in same package

Tuesday, 23 October 2012

     [
https://issues.jboss.org/browse/JBRULES-2402?page=com.atlassian.jira.plug...
]

Michael Anstis updated JBRULES-2402:
------------------------------------

    Fix Version/s: 6.0.0.Beta1
                       (was: 5.5.0.CR1)

...
 Null Pointer exception while loading and executing two serialized
rules which are in same package

-------------------------------------------------------------------------------------------------

                 Key: JBRULES-2402
                 URL: https://issues.jboss.org/browse/JBRULES-2402
             Project: Drools
          Issue Type: Bug
      Security Level: Public(Everyone can see) 
          Components: drools-core  (expert)
    Affects Versions: 5.0.1.FINAL
         Environment: OS : Ubuntu ( 2.6.28-13-server )
 Sun Jdk 1.3
            Reporter: Nagarajan Santhanam
            Assignee: Tihomir Surdilovic
            Priority: Critical
             Fix For: 6.0.0.Beta1

 Hi,
 I'm trying to load drts in a serialized fashion and executing it. During execution, I
get the error as mentioned below. 
 But if I keep the package name different for both the drts, the same code works fine.
 Find below the errors and code snippets  :
 Files Used :
 1. Main.java
 2. SchemeEngine.java
 3. PurchaseOrder.java
 4. PurchaseOrderImpl.java
 5. SchemeHelper.java
 6. ON_PO_PROD_PACK_PER_DISC.drt
 7. ON_PO_PROD_DIS.drt
 Main.java
 *
  * To change this template, choose Tools | Templates
  * and open the template in the editor.
  */
 package test;
 import app.PurchaseOrder;
 import app.PurchaseOrderImpl;
 import java.util.ArrayList;
 import java.util.List;
 import scheme.SchemeEngine;
 /**
  *
  * @author msuser1
  */
 public class Main {
     /**
      * @param args the command line arguments
      */
     public static void testCrazyBug() throws Exception {
 //        String[] drts = new String[]{"/ON_PO_PROD_DIS.drt",
"/ON_PO_PROD_PACK_PER_DISC.drt",
"/ON_PO_PROD_PACK_PER_DISC_using_function.drt"};
 //        String[] xls = new String[]{"/ON_PO_PROD_DISC_1.xls",
"/ON_PO_PROD_PACK_PER_DISC.xls",
"/ON_PO_PROD_PACK_PER_DISC_using_function.xls"};
         String[] drts = new String[]{"/ON_PO_PROD_DIS.drt",
"/ON_PO_PROD_PACK_PER_DISC.drt"};
         String[] xls = new String[]{"/ON_PO_PROD_DISC_1.xls",
"/ON_PO_PROD_PACK_PER_DISC.xls"};
         PurchaseOrder po = new PurchaseOrderImpl();
         System.out.println("length of drt " + drts.length);
         SchemeEngine engineDirect = new
SchemeEngine(PurchaseOrderImpl.class.getClassLoader());
         for (int i = 0; i < drts.length; i++) {
             engineDirect.loadSchemeFromDRT(drts[i], xls[i]);
         }
         System.out.println("Applying Schemes in normal mode");
         engineDirect.applyOnPurchaseOrder(po);
         List serializedList = new ArrayList();
         for (int i = 0; i < drts.length; i++) {
             SchemeEngine engineLocal = new
SchemeEngine(PurchaseOrderImpl.class.getClassLoader());
             engineLocal.loadSchemeFromDRT(drts[i], xls[i]);
             byte[] blobBytes = engineLocal.serializeDefinition();
             serializedList.add(blobBytes);
         }
         SchemeEngine engineOptimized = new
SchemeEngine(PurchaseOrderImpl.class.getClassLoader());
         for (int i = 0; i < drts.length; i++) {
             engineOptimized.loadSerializedDefinition((byte[]) serializedList.get(i));
         }
         try {
             System.out.println("Applying Schemes in optmized mode");
             engineOptimized.applyOnPurchaseOrder(po);
         } catch (Exception e) {
             e.printStackTrace();
         }
     }
     public static void main(String args[]) throws Exception {
         testCrazyBug();
     }
 }
 SchemeEngine.java
 /*
  * To change this template, choose Tools | Templates
  * and open the template in the editor.
  */
 package scheme;
 import app.*;
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Properties;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 import org.drools.KnowledgeBase;
 import org.drools.KnowledgeBaseConfiguration;
 import org.drools.KnowledgeBaseFactory;
 import org.drools.builder.DecisionTableConfiguration;
 import org.drools.builder.DecisionTableInputType;
 import org.drools.builder.KnowledgeBuilder;
 import org.drools.builder.KnowledgeBuilderFactory;
 import org.drools.builder.ResourceType;
 import org.drools.common.DroolsObjectInputStream;
 import org.drools.common.DroolsObjectOutputStream;
 import org.drools.decisiontable.ExternalSpreadsheetCompiler;
 import org.drools.decisiontable.InputType;
 import org.drools.definition.KnowledgePackage;
 import org.drools.io.ResourceFactory;
 import org.drools.runtime.StatelessKnowledgeSession;
 import org.drools.template.parser.DataListener;
 import org.drools.template.parser.TemplateDataListener;
 /**
  *
  * @author msuser1
  */
 public class SchemeEngine {
     private KnowledgeBase kbase = null;
     private ClassLoader classLoader = null;
     public SchemeEngine(ClassLoader cl) {
         this.classLoader = cl;
         KnowledgeBaseConfiguration kbc =
KnowledgeBaseFactory.newKnowledgeBaseConfiguration(new Properties(), this.classLoader);
         kbase = KnowledgeBaseFactory.newKnowledgeBase(kbc);
     }
     public void loadSchemeFromDRL(String drlFileName) {
         DecisionTableConfiguration dtableconfiguration =
KnowledgeBuilderFactory.newDecisionTableConfiguration();
         dtableconfiguration.setInputType(DecisionTableInputType.XLS);
         KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
         kbuilder.add(ResourceFactory.newClassPathResource(drlFileName,
SchemeEngine.class),
                 ResourceType.DRL);
         if (kbuilder.hasErrors()) {
             System.err.println(kbuilder.getErrors().toString());
         }
         kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
     }
     public void loadSchemeFromXLS(String xlsFileName) {
         DecisionTableConfiguration dtableconfiguration =
KnowledgeBuilderFactory.newDecisionTableConfiguration();
         dtableconfiguration.setInputType(DecisionTableInputType.XLS);
         KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
         kbuilder.add(ResourceFactory.newClassPathResource(xlsFileName,
SchemeEngine.class),
                 ResourceType.DTABLE, dtableconfiguration);
         if (kbuilder.hasErrors()) {
             System.err.println(kbuilder.getErrors().toString());
         }
         kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
     }
     public void loadSchemeFromDRT(String drtFileName, String xlsFileName) throws
Exception {
         loadSchemeFromDRT(drtFileName, xlsFileName, 1, 1);
     }
     public void loadSchemeFromDRT(String drtFileName, String xlsFileName, int
startingRow, int startingColumn) throws Exception {
         InputStream drtInput = SchemeEngine.class.getResourceAsStream(drtFileName);
         ByteArrayOutputStream drtOut = new ByteArrayOutputStream();
         writeToStream(drtInput, drtOut);
         InputStream xlsInput = SchemeEngine.class.getResourceAsStream(xlsFileName);
         ByteArrayOutputStream xlsOut = new ByteArrayOutputStream();
         writeToStream(xlsInput, xlsOut);
         loadSchemeFromDRT(drtOut.toByteArray(), xlsOut.toByteArray(), startingRow,
startingColumn);
     }
     private void writeToStream(InputStream in, OutputStream out) throws IOException {
         byte[] buf = new byte[4 * 1024];
         int numRead = 0;
         while ((numRead = in.read(buf)) >= 0) {
             out.write(buf, 0, numRead);
         }
     }
     public void loadSchemeFromDRT(byte[] drtContent, byte[] xlsContent) {
         loadSchemeFromDRT(drtContent, xlsContent, 1, 1);
     }
     public void loadSchemeFromDRT(byte[] drtContent, byte[] xlsContent, int startingRow,
int startingColumn) {
         final ExternalSpreadsheetCompiler converter = new ExternalSpreadsheetCompiler();
         final List<DataListener> listeners = new ArrayList<DataListener>();
         InputStream in = new ByteArrayInputStream(drtContent);
         TemplateDataListener listener = new TemplateDataListener(3, 1, in);
         listeners.add(listener);
         converter.compile(new ByteArrayInputStream(xlsContent), InputType.XLS,
listeners);
         KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();

kbuilder.add(ResourceFactory.newByteArrayResource(listener.renderDRL().getBytes()),
                 ResourceType.DRL);
         if (kbuilder.hasErrors()) {
             System.err.println(kbuilder.getErrors().toString());
         }
         kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
     }
     public byte[] serializeDefinition() {
         DroolsObjectOutputStream dos = null;
         ByteArrayOutputStream bos = null;
         try {
             bos = new ByteArrayOutputStream();
             dos = new DroolsObjectOutputStream(bos);
             dos.writeObject(kbase.getKnowledgePackages());
             return bos.toByteArray();
         } catch (IOException ex) {
             Logger.getLogger(SchemeEngine.class.getName()).log(Level.SEVERE, null, ex);
             return null;
         } finally {
             try {
                 dos.close();
                 bos.close();
             } catch (IOException ex) {
                 Logger.getLogger(SchemeEngine.class.getName()).log(Level.SEVERE, null,
ex);
             }
         }
     }
     public void loadSerializedDefinition(byte[] serializedContent) {
         try {
             DroolsObjectInputStream dis = null;
             ByteArrayInputStream bis = null;
             bis = new ByteArrayInputStream(serializedContent);
             dis = new DroolsObjectInputStream(bis);
             Collection<KnowledgePackage> defn =
(Collection<KnowledgePackage>)dis.readObject();
             kbase.addKnowledgePackages(defn);
         } catch (ClassNotFoundException ex) {
             Logger.getLogger(SchemeEngine.class.getName()).log(Level.SEVERE, null, ex);
         } catch (IOException ex) {
             Logger.getLogger(SchemeEngine.class.getName()).log(Level.SEVERE, null, ex);
         }
     }
     public void applyOnPurchaseOrder(PurchaseOrder purchaseOrder) {
         if (kbase.getKnowledgePackages().size() == 0) {
             throw new RuntimeException("No Schemes are loaded.");
         }
         List objects = new ArrayList();
         objects.add(purchaseOrder);
         if (purchaseOrder.orderDetails() != null &&
purchaseOrder.orderDetails().size() > 0) {
             Iterator iter = purchaseOrder.orderDetails().iterator();
             while (iter.hasNext()) {
                 PurchaseOrderDetail detail = (PurchaseOrderDetail) iter.next();
                 objects.add(detail);
             }
         }
         StatelessKnowledgeSession session = kbase.newStatelessKnowledgeSession();
         session.execute(Arrays.asList(objects.toArray()));
     }
     public void applyRule(Object[] objects) {
         if (kbase.getKnowledgePackages().size() == 0) {
             throw new RuntimeException("No Schemes are loaded.");
         }
         StatelessKnowledgeSession session = kbase.newStatelessKnowledgeSession();
         session.execute(Arrays.asList(objects));
     }
     public static void main(String[] args) {
     }
 }
 PurchaseOrder.java
 package app;
 /*
  * To change this template, choose Tools | Templates
  * and open the template in the editor.
  */
 import java.util.Date;
 import java.util.List;
 /**
  *
  * @author msuser1
  */
 public interface PurchaseOrder {
     public Float orderAmount();
     public Date orderDate();
     public Integer orderDay();
     public List orderDetails();
     public boolean belongsToGeoHierarchy(String nodeName);
     public void addFreeItem(String schemeId, String skuId, int qty);
     public void addFlatDiscount(String SchemeId, Float discountAmt);
     public void addPercentageDiscount(String SchemeId, Float discountPercent);
     public void addFlatDiscountForItem(String SchemeId, String skuId, Float
discountAmt);
     public void addPercentageDiscountForItem(String SchemeId, String skuId, Float
discountPercent);
     public void addPercentageDiscountPerUomForItem(String SchemeId, String skuId, Float
discountPercent);
     public void addInternalGiftVoucher(String SchemeId, Float voucherAmt);
     public void addExternalGiftVoucher(String SchemeId, Float voucherAmt, String
externalVendorId);
     public void addInternalGiftVoucherForItem(String SchemeId, String skuId, Float
voucherAmt);
     public void addExternalGiftVoucherForItem(String SchemeId, String skuId, Float
voucherAmt, String externalVendorId);
     public void addRewardPoint(String SchemeId, int rewardPoint);
     public void addRewardPointForItem(String SchemeId, String skuId, int rewardPoint);
     public void addWeightBasedFlatDiscountPerUomForItem(String SchemeId, String skuId,
Float discount_amt, String uomId);
     public Boolean immediatePayment();
     public Boolean regularPurchase();
     public Boolean consignmentPurchase();
     public Boolean cat2ConsignmentPurchase();
     public Boolean cat3ConsignmentPurchase();
     public Boolean intransitPurchase();
     public Boolean skuPresent(String skuId);
     public Integer materialQuantityForItem(String skuId);
     public Boolean schemeApplied(String schemeDefinitionId);
     public void addDetail(PurchaseOrderDetail prd);
 }

=========================================================================================================================
 PurchaseOrderImpl.java
 package app;
 /*
  * To change this template, choose Tools | Templates
  * and open the template in the editor.
  */
 import java.text.DateFormat;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
 import java.util.ArrayList;
 import java.util.Date;
 import java.util.List;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 /**
  *
  * @author msuser1
  */
 public class PurchaseOrderImpl implements PurchaseOrder {
     private List details = new ArrayList();
     public Date orderDate() {
         try {
             DateFormat fmt = new SimpleDateFormat("yyyy-dd-MM");
             Date dt = fmt.parse("2009-06-23");
             return dt;
         } catch (ParseException ex) {
             Logger.getLogger(PurchaseOrderImpl.class.getName()).log(Level.SEVERE, null,
ex);
             return null;
         }
     }
     public Integer orderDay(){
         return 10;
     }
     public List orderDetails() {
         return details;
     }
     public boolean belongsToGeoHierarchy(String nodeName) {
         return true;
     }
     public void addFreeItem(String schemeId, String skuId, int qty) {
         System.out.println("Add Free Item");
     }
     public void addFlatDiscount(String SchemeId, Long discountAmt) {
         System.out.println("Add Flat Discount");
     }
     public void addPercentageDiscount(String SchemeId, int discountPercent) {
         System.out.println("Add Percentage Discount");
     }
     public void addFlatDiscountForItem(String SchemeId, String skuId, Long discountAmt)
{
         System.out.println("Add Flat Discount For Item");
     }
     public void addPercentageDiscountForItem(String SchemeId, String skuId, int
discountPercent) {
         System.out.println("Add Percentage Discount For Item");
     }
     public void addPercentageDiscountPerUomForItem(String SchemeId, String skuId, int
discountPercent) {
         System.out.println("Add Percentage Discount For Uom For Item");
     }
     public void addInternalGiftVoucher(String SchemeId, Long voucherAmt) {
         System.out.println("Add Internal Gift Voucher");
     }
     public void addExternalGiftVoucher(String SchemeId, Long voucherAmt, String
externalVendorId) {
         System.out.println("Add External Gift Voucher");
     }
     public void addInternalGiftVoucherForItem(String SchemeId, String skuId, Long
voucherAmt) {
         System.out.println("Add Internal Gift Voucher For Item");
     }
     public void addExternalGiftVoucherForItem(String SchemeId, String skuId, Long
voucherAmt, String externalVendorId) {
         System.out.println("Add External Gift Voucher For Item");
     }
     public void addRewardPoint(String SchemeId, int rewardPoint) {
         System.out.println("Add Reward Point");
     }
     public void addRewardPointForItem(String SchemeId, String skuId, int rewardPoint) {
         System.out.println("Add Reward Point For Item");
     }
     public Boolean immediatePayment(){
         return true;
     }
     public Boolean regularPurchase() {
         return true;
     }
     public Boolean consignmentPurchase() {
         return false;
     }
     public Boolean cat2ConsignmentPurchase() {
         return false;
     }
     public Boolean cat3ConsignmentPurchase() {
         return false;
     }
     public Boolean commissionPurchase() {
         return false;
     }
     public Boolean intransitPurchase() {
         return false;
     }
     public Boolean skuPresent(String skuId) {
         return false;
     }
     public Integer materialQuantityForItem(String skuId) {
         return 10;
     }
     public Boolean schemeApplied(String schemeDefinitionId) {
         return false;
     }
     public void addWeightBasedFlatDiscountPerUomForItem(String SchemeId, String skuId,
Long discount_amt, String uomId) {
         throw new UnsupportedOperationException("Not supported yet.");
     }
     public void addDetail(PurchaseOrderDetail pod)
     {
         details.add(pod);
     }
     public void addFlatDiscount(String SchemeId, Float discountAmt) {
         throw new UnsupportedOperationException("Not supported yet.");
     }
     public void addFlatDiscountForItem(String SchemeId, String skuId, Float discountAmt)
{
         throw new UnsupportedOperationException("Not supported yet.");
     }
     public Float orderAmount() {
         throw new UnsupportedOperationException("Not supported yet.");
     }
     public void addPercentageDiscount(String SchemeId, Float discountPercent) {
         throw new UnsupportedOperationException("Not supported yet.");
     }
     public void addPercentageDiscountForItem(String SchemeId, String skuId, Float
discountPercent) {
         throw new UnsupportedOperationException("Not supported yet.");
     }
     public void addPercentageDiscountPerUomForItem(String SchemeId, String skuId, Float
discountPercent) {
         throw new UnsupportedOperationException("Not supported yet.");
     }
     public void addInternalGiftVoucher(String SchemeId, Float voucherAmt) {
         throw new UnsupportedOperationException("Not supported yet.");
     }
     public void addExternalGiftVoucher(String SchemeId, Float voucherAmt, String
externalVendorId) {
         throw new UnsupportedOperationException("Not supported yet.");
     }
     public void addInternalGiftVoucherForItem(String SchemeId, String skuId, Float
voucherAmt) {
         throw new UnsupportedOperationException("Not supported yet.");
     }
     public void addExternalGiftVoucherForItem(String SchemeId, String skuId, Float
voucherAmt, String externalVendorId) {
         throw new UnsupportedOperationException("Not supported yet.");
     }
     public void addWeightBasedFlatDiscountPerUomForItem(String SchemeId, String skuId,
Float discount_amt, String uomId) {
         throw new UnsupportedOperationException("Not supported yet.");
     }
 }
 SchemeHelper.java
 /*
  * To change this template, choose Tools | Templates
  * and open the template in the editor.
  */
 package helper;
 import app.PurchaseOrder;
 import app.PurchaseOrderDetail;
 import java.lang.Float;
 /**
  *
  * @author msuser1
  */
 public class SchemeHelper {
     public static boolean belongsToProductHierarchy(String skuId, String nodeName) {
         return false; //Sku.belongsToProductHierarchy(nodeName);
     }
     public static Integer materialQuantityForItem(PurchaseOrder po, String skuId) {
         return po.materialQuantityForItem(skuId);
     }
     public static boolean productIdOrProductAncestorMatching(PurchaseOrderDetail
poDetail, String productId) {
         System.out.println("Inside the
method......................################################");
         boolean result = false;
         try {
             result = poDetail.productId().compareTo(productId) == 0 ||
poDetail.belongsToAncestorProduct(productId).booleanValue();
         } catch (Exception e) {
             e.printStackTrace();
         }
         return result;
     }
     public static boolean complexMethod(PurchaseOrderDetail poDetail, String productId,
String packId) {
         boolean result = false;
         try {
             result = (poDetail.packId().compareTo(packId) == 0 ||
poDetail.belongsToAncestorPack(packId).booleanValue()) &&
(poDetail.productId().compareTo(productId) == 0 ||
poDetail.belongsToAncestorProduct(productId).booleanValue());
         } catch (Exception ex) {
             ex.printStackTrace();
         }
         return result;
     }
 }
 ON_PO_PROD_DIS.drt
 template header
 SchemeID
 ProductID
 Discount
 package app;
 import function helper.SchemeHelper.*
 template "Scheme"
 rule &quot;po_@{SchemeID}_(a){row.rowNumber}&quot;
 when
     $order : PurchaseOrder()
     $orderDetail : PurchaseOrderDetail($det :
this,eval($det.productId().compareTo("@{ProductID}") == 0 ||
$det.belongsToAncestorProduct("@{ProductID}") == true), purchaseOrder ==
$order)
 then
     float disAmt=0;
     disAmt = $orderDetail.saleableQty() * @{Discount}F;
     System.out.println("Discount amount = @{Discount}..XXXX..........."  +
disAmt);
     $order.addFlatDiscountForItem(&quot;(a){SchemeID}&quot;,$orderDetail.skuId(), disAmt);
 end
 end template
 ON_PO_PROD_PACK_PER_DISC.drt
 template header
 SchemeID
 ProductID
 PackID
 Discount
 package app;
 import app.*;
 import function helper.SchemeHelper.*
 template "Scheme"
 rule &quot;ON_PO_PROD_PACK_PER_DISC_(a){row.rowNumber}&quot;
 when
     $order: PurchaseOrder()
     $orderDetail : PurchaseOrderDetail($det : this, eval(
 ($det.belongsToAncestorPack("@{PackID}") == true ||
$det.packId().compareTo("@{PackID}") == 0)
  && 
 ($det.productId().compareTo("@{ProductID}") == 0 ||
$det.belongsToAncestorProduct("@{ProductID}") == true)
 ) , purchaseOrder == $order)
 then
     float disAmt=0;
     disAmt =  ($orderDetail.materialPrice() * $orderDetail.saleableQty()) *
@{Discount}F/100;
     System.out.println("Discount amount = XXXX..........."  + disAmt);
     $order.addFlatDiscountForItem(&quot;(a){SchemeID}&quot;,$orderDetail.skuId(), disAmt);
 end
 end template
 Error :
 java.lang.NullPointerException
         at org.drools.base.ClassFieldReader.getIndex(ClassFieldReader.java:78)
         at
org.drools.util.LeftTupleIndexHashTable.<init>(LeftTupleIndexHashTable.java:48)
         at
org.drools.util.LeftTupleIndexHashTable.<init>(LeftTupleIndexHashTable.java:35)
         at
org.drools.common.SingleBetaConstraints.createBetaMemory(SingleBetaConstraints.java:172)
         at org.drools.reteoo.BetaNode.createMemory(BetaNode.java:340)
         at
org.drools.common.ConcurrentNodeMemories.createNodeMemory(ConcurrentNodeMemories.java:96)
         at
org.drools.common.ConcurrentNodeMemories.getNodeMemory(ConcurrentNodeMemories.java:75)
         at
org.drools.common.AbstractWorkingMemory.getNodeMemory(AbstractWorkingMemory.java:1534)
         at org.drools.reteoo.JoinNode.assertLeftTuple(JoinNode.java:103)
         at
org.drools.reteoo.CompositeLeftTupleSinkAdapter.doPropagateAssertLeftTuple(CompositeLeftTupleSinkAdapter.java:145)
         at
org.drools.reteoo.CompositeLeftTupleSinkAdapter.createAndPropagateAssertLeftTuple(CompositeLeftTupleSinkAdapter.java:57)
         at
org.drools.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:142)
         at
org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:42)
         at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:185)
         at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:146)
         at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1046)
         at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1001)
         at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:788)
         at
org.drools.impl.StatelessKnowledgeSessionImpl.execute(StatelessKnowledgeSessionImpl.java:259)
         at scheme.SchemeEngine.applyOnPurchaseOrder(SchemeEngine.java:178)
         at test.Main.testCrazyBug(Main.java:55)
         at test.Main.main(Main.java:64) 
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[jboss-jira] [JBoss JIRA] (JBRULES-2402) Null Pointer exception while loading and executing two serialized rules which are in same package