Steps to reproduce:
zabbix_server.log:
493:20190116:110541.082 item "adefrdappls25000:jvm.cpu.usage" became not supported: Cannot evaluate expression: "Cannot evaluate function "last()": not enough data.".
490:20190116:110542.083 item "adefrdappls25000:net.tcp.service[tcp,

{HOST.CONN}

,

{HOST.PORT}

]" became not supported: Invalid third parameter.
502:20190116:110557.276 JMX agent item "jmx.discovery["java.lang:type=GarbageCollector,name=*"]" on host "adefrdappls25000" failed: first network error, wait for 15 seconds
518:20190116:110637.734 JMX agent item "jmx["java.lang:type=Memory","HeapMemoryUsage.committed"]" on host "adefrdappls25000" failed: another network error, wait for 15 seconds
518:20190116:110709.743 temporarily disabling JMX agent checks on host "adefrdappls25000": host unavailable

zabbix_java_gateway.log:

2019-01-16 11:53:23.364 [pool-1-thread-1] WARN com.zabbix.gateway.SocketProcessor - error processing request: jmxrmi: service:jmx:rmi:///jndi/rmi://10.41.9.158:48011/jmxrmi
2019-01-16 11:53:27.367 [pool-1-thread-2] WARN com.zabbix.gateway.SocketProcessor - error processing request: Connection timed out: service:jmx:rmi:///jndi/rmi://adefrdappls25000.s2.ms.unilever.com:48031/jmxrmi
2019-01-16 11:54:36.379 [pool-1-thread-3] WARN com.zabbix.gateway.SocketProcessor - error processing request: Connection timed out: service:jmx:rmi:///jndi/rmi://10.41.9.158:48011/admin
2019-01-16 11:54:39.382 [pool-1-thread-4] WARN com.zabbix.gateway.SocketProcessor - error processing request: Connection timed out: service:jmx:rmi:///jndi/rmi://adefrdappls25000.s2.ms.unilever.com:48031/admin
2019-01-16 11:55:53.397 [pool-1-thread-5] WARN com.zabbix.gateway.SocketProcessor - error processing request: jmxrmi: service:jmx:rmi:///jndi/rmi://10.41.9.158:48011/jmxrmi
2019-01-16 11:55:57.400 [pool-1-thread-1] WARN com.zabbix.gateway.SocketProcessor - error processing request: Connection timed out: service:jmx:rmi:///jndi/rmi://adefrdappls25000.s2.ms.unilever.com:48031/jmxrmi
2019-01-16 11:57:06.412 [pool-1-thread-2] WARN com.zabbix.gateway.SocketProcessor - error processing request: Connection timed out: service:jmx:rmi:///jndi/rmi://10.41.9.158:48011/admin
2019-01-16 11:57:09.415 [pool-1-thread-3] WARN com.zabbix.gateway.SocketProcessor - error processing request: Connection timed out: service:jmx:rmi:///jndi/rmi://adefrdappls25000.s2.ms.unilever.com:48031/admin
2019-01-16 11:58:23.430 [pool-1-thread-4] WARN com.zabbix.gateway.SocketProcessor - error processing request: jmxrmi: service:jmx:rmi:///jndi/rmi://10.41.9.158:48011/jmxrmi
2019-01-16 11:58:27.433 [pool-1-thread-5] WARN com.zabbix.gateway.SocketProcessor - error processing request: Connection timed out: service:jmx:rmi:///jndi/rmi://adefrdappls25000.s2.ms.unilever.com:48031/jmxrmi