Tomcat 9.0.68 with SkyWalking Java Agent 8.13.0 Causes Netty Connection Timeout (Nacos/Redis Affected)

[Sic9527]

Description:
When deploying multiple applications on Apache Tomcat 9.0.68 (Oracle JDK 1.8) with SkyWalking Java Agent 8.13.0, we observe Netty-related connection timeout exceptions during Tomcat startup. This affects components like Nacos (gRPC) and Redis. The issue disappears when the SkyWalking agent is removed.
​Error Log:
java.util.concurrent.TimeoutException: Waited 3000 milliseconds...
at com.alibaba.nacos.shaded.com.google.common.util.concurrent.AbstractFuture.get
​Environment:
Tomcat: 9.0.68
JDK: Oracle JDK 1.8.0_301
SkyWalking: Java Agent 8.13.0

[wu-sheng]

8.13 is very old. Please try the latest.

[Sic9527]

I'll give it a try, thank you

[wu-sheng]

And alibaba shaded codes are not tested by us. So, it may face some issues we can't know.