micronaut-core: EmbeddedServer java.net.BindException: Address already in use

Expected Behavior

Spinning up EmbeddedServer should never throw java.net.BindException: Address already in use

Actual Behaviour

Spinning up EmbeddedServer sometimes throws java.net.BindException: Address already in use.

My guess is that sometimes another process binds to the random port it has chosen before it has a chance to?

• SocketUtils.findAvailableTcpPort() starts looking at port 1024 rather than 5000, increasing the probability of a clash with another container spun up during the test
• In any case, random ports should be generated by binding to port 0 and accepting whatever the OS gives us- all other implementations are buggy. The port is only guaranteed to be free at the point SocketUtils checks, not by the time the server tries to listen.

Steps To Reproduce

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Environment Information

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Example Application

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Version

2.5.5