See www.zabbix.com for the official Zabbix site.
Support for java.util.concurrent.atomic types in Java gateway
Support for primitive types in Java gateway should be extended with the following list of classes from java.util.concurrent.atomic package:
Doing so is deemed to be as simple as adding these types to JMXItemChecker.isPrimitiveAttributeType() function. Zabbix will then automatically obtain their value using toString() method.
- https://www.zabbix.com/documentation/3.0/manual/config/items/itemtypes/jmx_monitoring (document list of supported types)