Sending invalid requests may force Executor into an unstable state

Steps to reproduce the faulty state;

1. Start Banzai and Executor
2. In Banzai specify the side to be 'Cross' and send a message (This will give an exception in Executor side)
3. Now send a valid message from Banzai (specifying the side as Buy or Sell)

Doing this will force Executor to an infinite loop giving the following output over and over...

<20080312-03:48:59, FIX.4.1:EXEC->BANZAI, incoming> (8=FIX.4.19=12535=D34=443=Y49=BANZAI52=20080312-03:48:5956=EXEC122=20080312-03:48:5711=120529373765021=138=540=154=155=IBM59=010=103)
<20080312-03:48:59, FIX.4.1:EXEC->BANZAI, event> (MsgSeqNum too high, expecting 3 but received 4)
<20080312-03:48:59, FIX.4.1:EXEC->BANZAI, outgoing> (8=FIX.4.19=6435=234=3549=EXEC52=20080312-03:48:5956=BANZAI7=316=99999910=200)
<20080312-03:48:59, FIX.4.1:EXEC->BANZAI, event> (Sent ResendRequest FROM: 3 TO: 999999)
<20080312-03:48:59, FIX.4.1:EXEC->BANZAI, incoming> (8=FIX.4.19=12535=D34=343=Y49=BANZAI52=20080312-03:48:5956=EXEC122=20080312-03:48:5411=120529373427321=138=540=154=855=IBM59=010=104)
<20080312-03:48:59, FIX.4.1:EXEC->BANZAI, event> (ResendRequest for messages FROM 3 TO 3 has been satisfied.)
<20080312-03:48:59, FIX.4.1:EXEC->BANZAI, event> (Invalid order side: 8
java.lang.RuntimeException: Invalid order side: 8
at quickfix.examples.executor.Application.getPrice(Application.java:185)
at quickfix.examples.executor.Application.onMessage(Application.java:204)
at quickfix.fix41.MessageCracker.crack41(MessageCracker.java:205)
at quickfix.MessageCracker.crack(MessageCracker.java:45)
at quickfix.examples.executor.Application.fromApp(Application.java:131)
at quickfix.Session.fromCallback(Session.java:1287)
at quickfix.Session.verify(Session.java:1245)
at quickfix.Session.verify(Session.java:1316)
at quickfix.Session.next(Session.java:727)
at quickfix.mina.SingleThreadedEventHandlingStrategy$SessionMessageEvent.processMessage(SingleThreadedEventHandlingStrategy.java:106)
at quickfix.mina.SingleThreadedEventHandlingStrategy.block(SingleThreadedEventHandlingStrategy.java:70)
at quickfix.mina.SingleThreadedEventHandlingStrategy$1.run(SingleThreadedEventHandlingStrategy.java:86)
at java.lang.Thread.run(Thread.java:595)
)