jvm exits for unknown reason

Question

Openjdk version "11" 2018-09-25, Spring Boot 2.6.6 application, will automatically exit for unknown reasons. It appears approximately every half month to one month

Introduction to the situation:

G1 garbage collector, maximum heap memory 8G

1. It is not a Linux system that kills processes

2. No out of memory

3. No JVM error file generated

4. The springboot log shows that the application is gracefully exiting normally, while the springApplication ShuttdownHook

5. Checked the ready-made logs and did not find any time consumption issues with the business thread

6. MAT tool found a large object in the heap file, accounting for approximately 1.4G

When it should be crashed, the heap memory is approximately 70% used

Who has a troubleshooting strategy? Help, thank you!

I hope to receive my troubleshooting ideas or reasons for this issue