[AREX] Agent would not install due to null.

[xiaoquanWu]

Due to technical research, I tried to use arextest for the first time, but it failed to start.

2025-09-05 11:29:46.947 [main]  io.arex.foundation.services.ConfigService - deserialize exception
2025-09-05 11:29:46.947 [main]  io.arex.foundation.services.ConfigService - [AREX] Load agent config, deserialize response is null, pause recording
2025-09-05 11:29:46.954 [main]  io.arex.foundation.services.ConfigService - [AREX] Report agent status, previous lastModified: null, lastModified: null. request: {"appId":"35c9d632af6838d3","host":"172.18.0.1","agentStatus":"UN_START","currentRate":"0","decelerateCode":0}
2025-09-05 11:29:46.954 [main]  io.arex.agent.instrumentation.BaseAgentInstaller - [AREX] Agent would not install due to null.

I checked the code and found that the interface returned something other than JSON data

POST: http://0.0.0.0:20093/api/config/agent/load, I get response below:

# HELP process_cpu_seconds_total Total user and system CPU time spent in seconds.
# TYPE process_cpu_seconds_total counter
process_cpu_seconds_total 33.45
# HELP process_start_time_seconds Start time of the process since unix epoch in seconds.
# TYPE process_start_time_seconds gauge
process_start_time_seconds 1.757041179915E9
# HELP process_open_fds Number of open file descriptors.
# TYPE process_open_fds gauge
process_open_fds 136.0
..
..
..

Can someone help me ？

ENV:
JDK17 + SpringBoot3, and Config the arextest-agent.jar by IDEA VM Optional