HTTP and HTTPS Auto-Binding

Payara Micro supports an auto-binding feature for its HTTP and HTTPS port, allowing Payara Micro to dynamically find a free HTTP or HTTPS port as required during startup.

This feature is controlled through these three options:

--autoBindHttp

Enables auto-bind functionality for the HTTP port

--autoBindSsl

Enables auto-bind functionality for the HTTPS port

--autoBindRange

Sets the range for the auto-bind feature

When auto-binding is enabled, Payara Micro will attempt to connect to the port specified with the --port or --sslPort option (or, if these options are not specified, to port 8080 and 8181 respectively), and if that port is busy, it will instead try to bind on the next port up, repeating this process until it finds a free port, or the --autoBindRange limiter is reached.

For example, if ports 8080 and 8081 were busy, and ports 8082 and 8182 were free, then starting Payara Micro with the following command would have the HTTP port bind to 8082 and the HTTPS port bind to 8182:

java -jar payara-micro.jar --autoBindHttp --sslPort 8181 --autoBindSsl

Whereas the following would fail to start in the same situation because --autoBindRange is not large enough (no free port within the range of 8080-8081):

java -jar payara-micro.jar --port 8080 --autoBindHttp --sslPort 8181 --autoBindSsl --autoBindRange 1
Warning
Be aware that the auto-bind feature does not currently read port values from domain.xml files; if the --port and --sslPort options are not used, then the --autoBindHttp and --autoBindSsl options will assume that the HTTP and HTTPS ports will be at the default values of 8080 and 8181 respectively.

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