@Bean
@ConfigurationProperties(prefix = "spring.datasource.tomcat")
public DataSource dataSource() {

    Map<Object,Object> resolvedDataSources = new HashMap<>();
    DataSourceBuilder dataSourceBuilder = new DataSourceBuilder(this.getClass().getClassLoader());

    for(String tenant : tenantList){
      dataSourceBuilder.driverClassName("com.mysql.jdbc.Driver")
      .url("jdbc:mysql://db-instance.example.com:3306/" + tenant)
      .username("DB_USER")
      .password("DB_PASSWORD");
      if(properties.getType() != null) {
        dataSourceBuilder.type(properties.getType());
      }
      resolvedDataSources.put(tenant, dataSourceBuilder.build());
    }
    MultitenantDataSource dataSource = new MultitenantDataSource();
    dataSource.setDefaultTargetDataSource(resolvedDataSources.get("database"));
    dataSource.setTargetDataSources(resolvedDataSources);
    dataSource.afterPropertiesSet();
    return dataSource;
}

spring.datasource.tomcat.max-wait=10000
spring.datasource.tomcat.max-active=120
spring.datasource.tomcat.test-on-borrow=true
spring.datasource.tomcat.validation-query=SELECT 1
spring.datasource.tomcat.test-while-idle=true
spring.datasource.tomcat.remove-abandoned=true
spring.datasource.tomcat.remove-abandoned-timeout=60