[rules-users] OutOfMemoryError with non-existence check in flow XOR split

[heldeen]

I am using drools marshalling for persistence and am getting an OOME with my
simple rule flow. I have a custom CommandService that persists at the end of
each execution. (I am not using JPA :-( ).

In the rule flow I have a split that checks for the non-existence of a
simple pojo using "not ValidationResult()" as one of the constraints. The
other constraint is ValidationResult(valid == false). I get an
OutOfMemoryError using the "not" in one of the constraints. Changing "not
ValidationResult()" to "ValidationResult(valid == true)" results in normal
operation. 

The flow is essentially Start->ValidationRuleFlowGroup->XOR Split->Valid
Action XOR Invalid Action -> End. The ValidationRuleFlowGroup has a simple
set of rules that will insert a ValidationResult() fact if something is not
valid.

Anyone have any idea why checking for the non-existence of a fact causes
this error. I'll post the pojo and the stack trace below.

public class ValidationResult {

  private boolean isValid;
  private String message;
  public boolean isValid() {
    return isValid;
  }
  public void setValid(boolean isValid) {
    this.isValid = isValid;
  }
  public String getMessage() {
    return message;
  }
  public void setMessage(String message) {
    this.message = message;
  }
}

java.lang.OutOfMemoryError: Java heap space
	at java.util.Arrays.copyOf(Arrays.java:2786)
	at java.io.ByteArrayOutputStream.write(ByteArrayOutputStream.java:94)
	at
java.io.ObjectOutputStream$BlockDataOutputStream.drain(ObjectOutputStream.java:1838)
	at
java.io.ObjectOutputStream$BlockDataOutputStream.write(ObjectOutputStream.java:1769)
	at java.io.DataOutputStream.writeInt(DataOutputStream.java:182)
	at
java.io.ObjectOutputStream$BlockDataOutputStream.writeInt(ObjectOutputStream.java:1904)
	at java.io.ObjectOutputStream.writeInt(ObjectOutputStream.java:769)
	at
org.drools.marshalling.impl.OutputMarshaller.writeLeftTuple(OutputMarshaller.java:459)
	at
org.drools.marshalling.impl.OutputMarshaller.writeInitialFactHandleLeftTuples(OutputMarshaller.java:356)
	at
org.drools.marshalling.impl.OutputMarshaller.writeFactHandles(OutputMarshaller.java:251)
	at
org.drools.marshalling.impl.OutputMarshaller.writeSession(OutputMarshaller.java:85)
	at
org.drools.marshalling.impl.DefaultMarshaller.marshall(DefaultMarshaller.java:117)

Thanks, 
Heath
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