[jboss-jira] [JBoss JIRA] Created: (JBRULES-1925) ClassCastException problem with reading working memory using ObjectInputStream

[Przemyslaw Rozycki (JIRA)]

ClassCastException problem with reading working memory using ObjectInputStream
------------------------------------------------------------------------------

                 Key: JBRULES-1925
                 URL: https://jira.jboss.org/jira/browse/JBRULES-1925
             Project: JBoss Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
    Affects Versions: 4.0.7
         Environment: JDK 1.5.0_11
            Reporter: Przemyslaw Rozycki
            Assignee: Mark Proctor


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) 

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