There are mentions of "Tonga" in JMX tests, which are confusing, not helpful, and should be removed.

A bug like this from 2002 suggests Tonga was a test suite/harness:
JDK-4780787: lin64: Intermittent Tonga harness crashes

These references have no useful meaning. They make no sense to most people.

These 5 files are not likely the only places which have that history.

test/jdk/javax/management/MBeanServer/ExceptionFactory.java: * |----- Original Description Coming From Tonga Original Source Code -------|
test/jdk/javax/management/MBeanServer/ExceptionTest.java: // Utility inner class coming from JMX Tonga test suite.
test/jdk/javax/management/MBeanServer/ExceptionTest.java: * from the DTonga JMX test suite.
test/jdk/javax/management/mxbean/Utils.java:// utility class for MXBean* tests coming from JMX Tonga test suite
test/jdk/javax/management/mxbean/Utils.java: * from the DTonga JMX test suite.
test/jdk/javax/management/query/SupportedQueryTypesTest.java: // Utility inner class coming from JMX Tonga test suite.
test/jdk/javax/management/query/SupportedQueryTypesTest.java: * from the DTonga JMX test suite.
test/jdk/javax/management/security/Utils.java:// utility class for MXBean* tests coming from JMX Tonga test suite