Root cause of exceptions thrown by custom JGroupsTransportLookup getting swallowed

AS7 uses a custom JGroupsTransportLookup so the jgroups channel is created from the jgroups subsystem. If channel creation throws an exception (i.e. during JGroupsTransportLookup.getJGroupsChannel(...)), the details are lost due to the exception handling in JGroupsTransport.buildChannel().
The root cause should be logged.