Task org.apache.activemq.artemis.utils.actors.ProcessorBase$$Lambda/0x00007f01f8246960@5fded0bc rejected from java.util.concurrent.ThreadPoolExecutor@1ddd3478[Shutting down, pool size = 1, active threads = 1, queued tasks = 0, completed tasks = 2]

null is not a legitimate internal value. Concurrent Modification?

Task org.apache.activemq.artemis.core.remoting.impl.netty.NettyConnector$Listener$2@6e97082c rejected from java.util.concurrent.ThreadPoolExecutor@2076920c[Shutting down, pool size = 1, active threads = 1, queued tasks = 0, completed tasks = 1]

Task org.apache.activemq.artemis.core.remoting.impl.netty.NettyConnector$Listener$2@1dc1610b rejected from java.util.concurrent.ThreadPoolExecutor@138c1613[Shutting down, pool size = 1, active threads = 1, queued tasks = 0, completed tasks = 1]