Old mysql connections dont get killed on application reload in Grails 4

[luiszimmermann]

Steps to Reproduce

1. Create a New App
   • grails create-app testmysql
2. Add mysql dependencies in build.gradle
   • runtime "mysql:mysql-connector-java:5.1.47"
3. Create Schema and add connection to mysql in application.yml

dataSource:
            dbCreate: "update"
            #logSql: true
            url: "jdbc:mysql:https://localhost/testmysql?useSSL=false&allowPublicKeyRetrieval=true"
            driverClassName: "com.mysql.jdbc.Driver"
            username: "user"
            password: "pass"

Expected Behaviour

When a file gets changed and Grails 4 reload, the old connections should be gone.

Actual Behaviour

When a file gets changed and grails reaload, the old connections stay alive. With time, and many reloads, the mysql will reach the limit.

Environment Information

• Operating System: Windows 10
• Grails Version: Grails 4.0.0.RC2
• JDK Version:

openjdk version "1.8.0_212"
OpenJDK Runtime Environment Corretto-8.212.04.2 (build 1.8.0_212-b04)
OpenJDK 64-Bit Server VM Corretto-8.212.04.2 (build 25.212-b04, mixed mode)

• MySQL: 8.0.13