Capsule depends on JDK internal APIs that have been removed from JDK9

[chrisr3]

With JDK9 ea+160:

   Capsule   -> com.sun.jmx.mbeanserver.JmxMBeanServer  JDK internal API (java.management)
   Capsule   -> sun.management.Agent                    JDK internal API (JDK removed internal API)
   Capsule   -> sun.misc.VMSupport                      JDK internal API (JDK removed internal API)

Both of these sun. APIs seem to relate to JMX (capsule/src/main/java/Capsule.java):

final Properties agentProps = sun.misc.VMSupport.getAgentProperties();
if (agentProps.get(LOCAL_CONNECTOR_ADDRESS_PROP) == null) {
    log(LOG_VERBOSE, "Starting management agent");
    sun.management.Agent.agentmain(null); // starts a JMXConnectorServer that does not prevent the app from shutting down
}

[mikehearn]

I think this is a dupe of #110

[pron]

Yep. Duplicate.