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

Monday, 11 January 2010

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

                 Key: JBRULES-2402
                 URL: https://jira.jboss.org/jira/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: Mark Proctor
            Priority: Critical

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] Created: (JBRULES-2402) Null Pointer exception while loading and executing two serialized rules which are in same package