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

You can also see this link It tells you to include the following lines in the application.properties file.

spring.datasource.testWhileIdle = true
spring.datasource.timeBetweenEvictionRunsMillis = 3600000
spring.datasource.validationQuery = SELECT 1