java.util.ConcurrentModificationException while mutating an object

I am iterating over a List of CustomObject and while doing this iteration, I am mutating this object by adding a tag to tags list of this custom object. I am not adding or removing any CustomObject to …

How to make Spring server to start even if database is down?

I’m using a Spring Boot(1.4.7) & MyBatis. spring.main1.datasource.url=jdbc:mariadb://192.168.0.11:3306/testdb?useUnicode=true&characterEncoding=utf8&autoReconnect=true&socketTimeout=…