I see two different problems.
13:50:20,215 ERROR [XPathEvaluator] selection of size other than one: []
This means one of your expressions is required to return a node-set of size 1, as
described in the BPEL spec, but it returned an empty node-set (as evidenced by the empty
string inside the square brackets []). Check your expressions. The server log file
(jboss-4.x.x/server/default/log/server.log) will tell you which expression was being
evaluated and help you pinpoint the problem.
13:50:20,246 WARN [loggerI18N]
[com.arjuna.ats.internal.jta.transaction.arjunacore.lastResource.disallow] Adding multiple
last resources is disallowed. Current resource is
org.jboss.resource.connectionmanager.TxConnectionManager$LocalXAResource@151cc3
This situation is known and documented. Please refer to section 3.5.2 "Transaction
Manager" of the jBPM BPEL 1.1.1 manual for details.
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