After add the Skywalking agent, the Java service was restarted

[ShepherdZFJ]

**question description：**Our Java application is deployed in k8s containers. After we introduced the Skywalking agent, we found that the Java application restarted in the early morning. The application had a large number of batch processing scheduled tasks at that time. The error message is as follows：

When we remove the Skywalking agent, the system will no longer restart. Otherwise, it restarts every morning. Therefore, we can rule out that it is caused by the memory issue of the Java application itself.

The startup parameters are as follows：
-javaagent:/skywalking/skywalking-agent/skywalking-agent.jar -Dskywalking.agent.service_name=service-name -Dskywalking.collector.backend_service=host:11800

Amazingly, when I added the parameters：
-Dskywalking.agent.cache_class=true
Everything is ok！！！
But up to now, I still don't know why.
Has anyone encountered the same situation or do you know the reason?
THANKS

[wu-sheng]

Are you using an old version(before v9)? This config should be deprecated and removed.

[ShepherdZFJ]

yes, java-agent version:8.14.0，this version have the problems I described above? I couldn't find any information about this problem, so I came here to seek an answer and try to figure out what's going on.

[wu-sheng]

That is hard to tell just from your description. Why did you pick a so old version in a new deployment?
I could only say, usually that error means you have some other agent or hot-code-change library(e.g. spring dev-tool) in your application.

[ShepherdZFJ]

Our APM Skywalking system was deployed in 2023, so the version is a bit old. Now, when integrating a new Java application, we encountered this problem. The Java application does not have any other agents.

[wu-sheng]

I could only say, usually that error means you have some other agent or hot-code-change library(e.g. spring dev-tool) in your application.

Then most likely this. Also, we still encourage you to upgrade as much as possible. Many things are changed with years. Those you are using are too old.

[ShepherdZFJ]

all right, thanks for your reply, I am a big fan of you. 🫡