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The editor for server resources only displays JNDI name, resource type and enablement, but does not displays any of the other properties that can be found in the XML. E.g. idle-timeout-in-seconds, is-connection-validation-required, etc.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss