Error while invoking onHeartBeat() method, exception is "Cannot load header

Question

I have a problem that when I read out an IMAP mailbox I sometimes get the above problem, and sometimes I don't get the problem.
Below I attached the main parts of my environment to get an insight within the code:
bpel.xml of process that is reading out the IMAP mailbox
<activationAgents>
<activationAgent className="com.collaxa.cube.activation.mail.MailActivationAgent"
heartBeatInterval="60">
<property name="accountName">account</property>
</activationAgent>
account.xml
<mailAccount xmlns="http://services.oracle.com/bpel/mail/account">
<userInfo>
<displayName>Eneco Process lAyer</displayName>
<organization>iFactory</organization>
<replyTo>[email protected]</replyTo>
</userInfo>
<outgoingServer>
<protocol>smtp</protocol>
<host>10.126.16.73</host>
<port>25</port>
<authenticationRequired>false</authenticationRequired>
</outgoingServer>
<incomingServer>
<protocol>imap</protocol>
<host>10.126.20.8</host>
<port>143</port>
<email>IFACAORTA</email>
<password>CRYPT{IB3B7SrA3kMYHoBDzWwsEg==}</password>
<folderName>InBox</folderName>
</incomingServer>
</mailAccount>
The domain.log of the appserver
<2006-12-04 15:08:25,546> <ERROR> <default.collaxa.cube.activation> <HeartBeatListenerJob::execute> Error while invoking onHeartBeat() method, exception is "Cannot load header".
<2006-12-04 15:08:25,562> <ERROR> <default.collaxa.cube.activation> <HeartBeatListenerJob::execute> Error while invoking onHeartBeat() method, exception is "No content".

Answer 1

This problem is occuring only on BPEL release 10.1.3.
I retested this again on BPEL 10.1.2, but there the problem did not occur.