how to set mysql max idel by jetty - jetty

Question

I want to use jetty instead of tomcat, but how to set mysql max idel by jetty?
Environment:spring boot, gradle
spring:
datasource:
url: jdbc:mysql://${MYSQL_HOST:cc-mysql}:${MYSQL_PORT:3306}/cc
username: ${MYSQL_USERNAME:root}
password: ${MYSQL_PASSWORD:root}
driver-class-name: com.mysql.jdbc.Driver
tomcat:
max-active: ${MYSQL_MAX_ACTIVE:10}
max-idle: ${MYSQL_MAX_IDEL:1}
jpa:
show-sql: false
hibernate:
ddl-auto: update

Answer 1

The configurations within spring.datasource.tomcat.* is for configuring the Tomcat DataSource Pool. (aka org.apache.tomcat.jdbc.pool.DataSource)
A more complete example with the missing (implied?) spring.datasource.type option.
spring:
application:
name: My Example Application
datasource:
name: example
url: jdbc:mysql://dev.mysql.example.com:4444/db?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&autoReconnect=true&failOverReadOnly=false
username: userexample
password: userpass
type: org.apache.tomcat.jdbc.pool.DataSource
driver-class-name: com.mysql.jdbc.Driver
tomcat:
max-active: 5
max-idle: 5
min-idle: 5
initial-size: 5
validation-query: 'select 1'
test-on-borrow: true
test-on-return: true
test-while-idle: true
max-wait: 15000
Jetty doesn't come with a container specific DataSource Pool.
At this point you have two options.
Use the mysql datasource directly. (this is the simplest approach)
Use one of the many DataSource pooling libraries out there instead.
If you choose to use a DataSource Pool library, it will have its own configuration that you'll have to learn to to know how to tweak it. The configuration max-idle may not exist, or may even be named differently in that library, or may exist but not be configured via a simple number, or it might refer to minutes (or milliseconds) instead of seconds.