Can we somehow inject properties to use the still unknown micronaut server port? The problem is that our tests sometimes fail because the port selected isn't available by the time we start the Embedded Server.

We have a pattern where we use:

@Requires(property = "micronaut.http.services.some-service.url")

for loading a client and micronaut uses the same. However, when testing controller code we use:

val port: Int = SocketUtils.findAvailableTcpPort()
val applicationProperties: Map<String, Any> = 
    mapOf(
        "micronaut.server.port" to port,
        "micronaut.http.services.some-service.url" to "http://localhost:$port"
    )
val embeddedServer = ApplicationContext.run(
    EmbeddedServer::class.java, 
    applicationProperties, 
    "test"
 )

On a busy build server, this often fails (~5% of the time) as the port is in a race condition and not available. I'm aware of the Random Port, but I'm not sure we can use it in the properties.

Can we somehow inject properties to use the still unknown micronaut server port? The problem is that our tests sometimes fail because the port selected isn't available by the time we start the Embedded Server.

We have a pattern where we use:

@Requires(property = "micronaut.http.services.some-service.url")

for loading a client and micronaut uses the same. However, when testing controller code we use:

val port: Int = SocketUtils.findAvailableTcpPort()
val applicationProperties: Map<String, Any> = 
    mapOf(
        "micronaut.server.port" to port,
        "micronaut.http.services.some-service.url" to "http://localhost:$port"
    )
val embeddedServer = ApplicationContext.run(
    EmbeddedServer::class.java, 
    applicationProperties, 
    "test"
 )

On a busy build server, this often fails (~5% of the time) as the port is in a race condition and not available. I'm aware of the Random Port, but I'm not sure we can use it in the properties.

• micronaut

1 Answer 1

Yes, you can. For example in your application-test.properties set a random port for the Micronaut Server. 99% of all execution it will pick a free port without any problem.

Then set the micronaut.server.port to your http client.

micronaut.server.port=${random.port}
micronaut.http.services.some-service.url=http://localhost:${micronaut.server.port}