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错误pool.ConnectionPool - 无法创建池的初始连接

我正在关注Grails的应用程序开发,名为TekDays,名为"Grails 2 - A quick start quide".当我开始配置数据源时遇到了问题.我不知道是什么原因因为我所遵循的步骤非常清楚.源代码和错误写在下面.

DataSource.groovy的:

dataSource {
pooled = true
jmxExport = true
driverClassName = "org.h2.Driver"
username = "dave"
password = "1234"
}
hibernate {
    cache.use_second_level_cache = true
    cache.use_query_cache = false
    cache.region.factory_class =     'net.sf.ehcache.hibernate.EhCacheRegionFactory' // Hibernate 3
//    cache.region.factory_class =     'org.hibernate.cache.ehcache.EhCacheRegionFactory' // Hibernate 4
    singleSession = true // configure OSIV singleSession mode
    flush.mode = 'manual' // OSIV session flush mode outside of     transactional context
}

// environment specific settings
environments {
    development {
        dataSource {
            dbCreate = …
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grails database-connection datasource

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