问题描述
我最近将Keycloak升级到了版本9，并且在Docker中运行时，无法附加远程调试器.我怀疑这与Keycloak向Java 9+的基础升级有关.
I recently upgraded Keycloak to version 9, and when running in Docker, I'm having trouble attaching a remote debugger. I suspect this has to do with Keycloak's underlying upgrade to Java 9+.
我得到的错误是:
handshake failed - connection prematurally closed
我在Docker中正确映射了我的端口(我可以运行Keycloak版本7，并且可以很好地连接).
I have my ports mapped correctly within Docker (I can run Keycloak version 7 and it attaches just fine).
推荐答案
事实证明，Java 9引入了有关调试的安全性增强.此处的信息: https://stackoverflow.com/a/60090750/2117355
As it turns out, Java 9 introduced a security enhancement with respect to debugging. Information here: https://stackoverflow.com/a/60090750/2117355
在我的Keycloak docker-compose服务定义中，我能够在environment下添加:
In my Keycloak docker-compose service definition, I was able to add under environment:
DEBUG_PORT: "*:8787"
这解决了问题.我现在可以调试了.
And that fixed the problem. I'm now able to debug.
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