为什么springboot数据源max-wait无效

Question

我在项目中配置了spring.datasource.max-wait = 3000，并且当spring.datasource.url错误时，我认为它将在3秒后引发Exception。但这并没有生效。它仍然花费超过3s（约5m）的时间来抛出Exception。为什么？

springboot的版本是v1.5.8.RELEASE

这样的配置和代码

spring:
  datasource:
    master:
      url: jdbc:mysql://172.16.11.229:3306/tc_ums?zeroDateTimeBehavior=convertToNull&autoReconnect=true&characterEncoding=utf-8
      username: root
      password: 1234
      driver-class-name: com.mysql.jdbc.Driver
      maxActive: 10
      maxIdle: 5
      minIdle: 5
      initialSize: 5
      minEvictableIdleTimeMillis: 3600000
      timeBetweenEvictionRunsMillis: 1200000
      test-while-idle: true
      validation-query: SELECT 1
      max-wait: 3000
    slave00:
      url: jdbc:mysql://172.16.11.229:3306/tc_ums?zeroDateTimeBehavior=convertToNull&autoReconnect=true&characterEncoding=utf-8
      username: root
      password: 1234
      driver-class-name: com.mysql.jdbc.Driver
      maxActive: 10
      maxIdle: 5
      minIdle: 5
      initialSize: 5
      minEvictableIdleTimeMillis: 1800000
      timeBetweenEvictionRunsMillis: 300000
      test-while-idle: true
      validation-query: SELECT 1
      max-wait: 3000



@Bean
@Primary
@ConfigurationProperties(prefix="spring.datasource.master")
public DataSource MasterDataSource() {
    return new DataSource();
}

@Bean
@ConfigurationProperties(prefix="spring.datasource.slave00")
public DataSource SlaveDataSource00() {
    return new DataSource();
}

@Bean
public DynamicDataSource dataSource(@Qualifier("MasterDataSource") DataSource masterDataSource,
                                    @Qualifier("SlaveDataSource00") DataSource slaveDataSource00) {
    Map<Object, Object> targetDataSources = new HashMap<Object, Object>();
    targetDataSources.put(DatabaseType.master, masterDataSource);
    targetDataSources.put(DatabaseType.slave00, slaveDataSource00);

    DynamicDataSource dataSource = new DynamicDataSource();
    dataSource.setTargetDataSources(targetDataSources);
    dataSource.setDefaultTargetDataSource(masterDataSource);
    return dataSource;
}