Connection lost overnight (spring boot + mysql)

Question

My spring boot application always show me this whitelabel error in the morning: Could not open JPA EntityManager for transaction; nested exception is javax.persistence.Persi

Answer 1

Check this answer: Spring Boot JPA - configuring auto reconnect

In short, you'll need:

spring.datasource.testOnBorrow=true
spring.datasource.validationQuery=SELECT 1