Exceptions when closing SJM in unit tests

[andrus]

Getting this exception at the end of each unit test that does mail delivery, e.g. in SimpleJavaMailDeliveryIT.

It is benign, but still should be fixed. Looks like the issue is that Greenmail (test SMTP server) is shutdown before the app (BQRuntime) is shutdown.

[WARN] [stderr] Exception in thread "pool-75-thread-1" org.simplejavamail.smtpconnectionpool.TransportHandlingException: error closing transport connection
[WARN] [stderr] 	at org.simplejavamail.smtpconnectionpool.TransportAllocator.deallocate(TransportAllocator.java:62)
[WARN] [stderr] 	at org.simplejavamail.smtpconnectionpool.TransportAllocator.deallocate(TransportAllocator.java:30)
[WARN] [stderr] 	at org.bbottema.genericobjectpool.GenericObjectPool$AutoAllocatorDeallocator.deallocate(GenericObjectPool.java:283)
[WARN] [stderr] 	at org.bbottema.genericobjectpool.GenericObjectPool$AutoAllocatorDeallocator.allocatedCorePoolAndDeallocateOneOrPlanDeallocations(GenericObjectPool.java:270)
[WARN] [stderr] 	at org.bbottema.genericobjectpool.GenericObjectPool$AutoAllocatorDeallocator.run(GenericObjectPool.java:256)
[WARN] [stderr] 	at java.base/java.lang.Thread.run(Thread.java:829)
[WARN] [stderr] Caused by: javax.mail.MessagingException: Exception reading response;
[WARN] [stderr]   nested exception is:
[WARN] [stderr] 	java.net.SocketException: Connection reset
[WARN] [stderr] 	at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:2476)
[WARN] [stderr] 	at com.sun.mail.smtp.SMTPTransport.close(SMTPTransport.java:1396)
[WARN] [stderr] 	at org.simplejavamail.smtpconnectionpool.TransportAllocator.deallocate(TransportAllocator.java:60)
[WARN] [stderr] 	... 5 more
[WARN] [stderr] Caused by: java.net.SocketException: Connection reset
[WARN] [stderr] 	at java.base/java.net.SocketInputStream.read(SocketInputStream.java:186)
[WARN] [stderr] 	at java.base/java.net.SocketInputStream.read(SocketInputStream.java:140)
[WARN] [stderr] 	at com.sun.mail.util.TraceInputStream.read(TraceInputStream.java:102)
[WARN] [stderr] 	at java.base/java.io.BufferedInputStream.fill(BufferedInputStream.java:252)
[WARN] [stderr] 	at java.base/java.io.BufferedInputStream.read(BufferedInputStream.java:271)
[WARN] [stderr] 	at com.sun.mail.util.LineInputStream.readLine(LineInputStream.java:100)
[WARN] [stderr] 	at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:2456)
[WARN] [stderr] 	... 7 more
[WARN] [stderr] [pool-75-thread-2] INFO org.bbottema.genericobjectpool.GenericObjectPool - Simple Object Pool shutdown complete