netty - Out of x channels, only one transitions from state OPEN to CONNECTED

Question

I'm fairly new to both network programming in general and Netty in particular, so pray forgive my ignorance.

I wrote a small server using Netty's NIO transport, and thus far everything went smoothly. Now I implemented a test that tries to verify that my server does indeed support multiple concurrent connections. Much to my surprise, out of x (I tried different numbers between 10 and 100) connections to my server I open with a test client, only one transitions from state OPEN via BOUND to CONNECTED. All the others never make it past OPEN.

Before I dive into implementation details I would rather like to know whether someone can think of a general explanation for this phenomenon, or has experienced the same problem. Any hints are appreciated.

Regards, Olaf

Answer 1

事实证明，42 是在正确的轨道上：深埋在 spring xml 配置中的某个地方，突然出现了一个线程池配置，该配置将核心池大小和最大池大小都设置为 1。愚蠢的我。