2018-03-29 05:42:46.551 [pool-1-thread-3] WARN  com.zabbix.gateway.SocketProcessor - error processing request
com.zabbix.gateway.ZabbixException: java.lang.IllegalArgumentException: invalid username and password nullness combination
        at com.zabbix.gateway.JMXItemChecker.<init>(JMXItemChecker.java:71) ~[zabbix-java-gateway-4.0.0alpha3.jar:na]
        at com.zabbix.gateway.SocketProcessor.run(SocketProcessor.java:58) ~[zabbix-java-gateway-4.0.0alpha3.jar:na]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_161]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_161]
        at java.lang.Thread.run(Thread.java:748) [na:1.8.0_161]
Caused by: java.lang.IllegalArgumentException: invalid username and password nullness combination
        at com.zabbix.gateway.JMXItemChecker.<init>(JMXItemChecker.java:67) ~[zabbix-java-gateway-4.0.0alpha3.jar:na]
        ... 4 common frames omitted

2018-03-29 05:52:21.924 [pool-1-thread-1] WARN  com.zabbix.gateway.SocketProcessor - error processing request
com.zabbix.gateway.ZabbixException: java.net.ConnectException: Connection refused
        at com.zabbix.gateway.JMXItemChecker.getValues(JMXItemChecker.java:98) ~[zabbix-java-gateway-4.0.0alpha3.jar:na]
        at com.zabbix.gateway.SocketProcessor.run(SocketProcessor.java:63) ~[zabbix-java-gateway-4.0.0alpha3.jar:na]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_161]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_161]
        at java.lang.Thread.run(Thread.java:748) [na:1.8.0_161]
Caused by: java.net.ConnectException: Connection refused
        at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) ~[na:1.8.0_161]
        at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717) ~[na:1.8.0_161]
        at org.xnio.nio.WorkerThread$ConnectHandle.handleReady(WorkerThread.java:327) ~[jboss-client.jar:11.0.0.Final]
        at org.xnio.nio.WorkerThread.run(WorkerThread.java:591) ~[jboss-client.jar:11.0.0.Final]
        at ...asynchronous invocation...(Unknown Source) ~[na:na]
        at org.jboss.remoting3.EndpointImpl.connect(EndpointImpl.java:570) ~[jboss-client.jar:11.0.0.Final]
        at org.jboss.remoting3.EndpointImpl.connect(EndpointImpl.java:532) ~[jboss-client.jar:11.0.0.Final]
        at org.jboss.remoting3.EndpointImpl.connect(EndpointImpl.java:520) ~[jboss-client.jar:11.0.0.Final]
        at org.jboss.remotingjmx.RemotingConnector.internalRemotingConnect(RemotingConnector.java:268) ~[jboss-client.jar:11.0.0.Final]
        at org.jboss.remotingjmx.RemotingConnector.internalConnect(RemotingConnector.java:156) ~[jboss-client.jar:11.0.0.Final]
        at org.jboss.remotingjmx.RemotingConnector.connect(RemotingConnector.java:103) ~[jboss-client.jar:11.0.0.Final]
        at javax.management.remote.JMXConnectorFactory.connect(JMXConnectorFactory.java:270) ~[na:1.8.0_161]
        at com.zabbix.gateway.ZabbixJMXConnectorFactory$1.run(ZabbixJMXConnectorFactory.java:76) ~[zabbix-java-gateway-4.0.0alpha3.jar:na]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[na:1.8.0_161]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_161]
        ... 3 common frames omitted