ClassCastException problem with reading working memory using ObjectInputStream

I experienced the problem while reading WorkingMemory using ObjectInputStream.

Here is the code:

public class DroolsTest5 {

public static void main(String[] args) {
Properties props = new Properties();
props.setProperty("file", "<<place a path to any working DRL here>>");

RuleAgent ruleAgent = RuleAgent.newRuleAgent(props);

Fact fact1 = new Fact("a","b");

RuleBase ruleBase = ruleAgent.getRuleBase();
WorkingMemory baseWm = ruleBase.newStatefulSession(false);
baseWm.insert(fact1);

Iterator iter1 = baseWm.iterateObjects();

while (iter1.hasNext())

{ System.out.println(iter1.next()); }

System.out.println("=====");

try {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeObject(baseWm);
oos.close();
byte[] buf = baos.toByteArray();
ByteArrayInputStream bais = new ByteArrayInputStream(buf);

ObjectInputStream ois = new ObjectInputStream(bais);
WorkingMemory wm = (WorkingMemory) ois.readObject();

Iterator iter2 = wm.iterateObjects();

while (iter2.hasNext())

{ System.out.println(iter2.next()); }

System.out.println("=====");
} catch (Exception e)

{ e.printStackTrace(); }

}

public static class Fact implements Serializable {

String name;

String id;

public Fact(String _name, String _id)

{ name = _name; id = _id; }

public String getId()

{ return id; }

public String getName()

{ return name; }

@Override
public String toString()

{ return "Name: " + name + ", Id: " + id; }

}
}

And here is an exception I get:

java.lang.ClassCastException: java.io.ObjectInputStream
at org.drools.reteoo.Rete$ClassObjectTypeConf.readObject(Rete.java:605)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:946)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1809)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1908)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1832)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1634)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
at org.drools.util.AbstractHashTable.readExternal(AbstractHashTable.java:66)
at org.drools.util.ObjectHashMap.readExternal(ObjectHashMap.java:41)
at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1755)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1717)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1634)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1634)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1908)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1832)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1908)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1832)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1908)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1832)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
at com.sample.DroolsTest5.main(DroolsTest5.java:52)