mysql - 错误 pool.ConnectionPool - 无法创建池的初始连接

Question

我是 Grails 新手。在 Datasource.groovy 中进行一些基本配置后，我的 grails 应用程序无法启动。我收到以下错误

Error 2015-07-03 15:27:19,014 [localhost-startStop-1] ERROR pool.ConnectionPool  - Unable to create initial connections of pool.

消息:Driver:org.h2.Driver@78f95cf6 为 URL:jdbc:mysql://localhost:3306/radb?createDatabaseIfNotExist=true 返回空值

|错误 2015-07-03 15:27:19,854 [localhost-startStop-1] 错误 context.GrailsContextLoaderListener - 初始化应用程序时出错:创建名为“transactionManagerPostProcessor”的 bean 时出错:bean 初始化失败；嵌套异常是 org.springframework.beans.factory.BeanCreationException:创建名为“transactionManager”的 bean 时出错:在设置 bean 属性“sessionFactory”时无法解析对 bean“sessionFactory”的引用；嵌套异常是 org.springframework.beans.factory.BeanCreationException:创建名为“sessionFactory”的 bean 时出错:调用 init 方法失败；嵌套异常是 java.lang.NullPointerException

数据库radb 存在。我已经验证过了

我的 Datasource.groovy 文件如下所示

dataSource {
    pooled = true
    jmxExport = true
    driverClassName =  "org.h2.Driver"
    dialect = "org.hibernate.dialect.MySQL5InnoDBDialect"
    //username = "sa"
    //password = ""
}
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 = "create-drop" // one of 'create', 'create-drop', 'update', 'validate', ''
            url = "jdbc:mysql://localhost:3306/radb?createDatabaseIfNotExist=true"
            username="root"
            password="root"
            logSql = true
        }
    }
    test {
        dataSource {
            dbCreate = "update"
            url = "jdbc:h2:mem:testDb;MVCC=TRUE;LOCK_TIMEOUT=10000;DB_CLOSE_ON_EXIT=FALSE"
        }
    }
    production {
        dataSource {
            dbCreate = "update"
            url = "jdbc:h2:prodDb;MVCC=TRUE;LOCK_TIMEOUT=10000;DB_CLOSE_ON_EXIT=FALSE"
            properties {
               // See http://grails.org/doc/latest/guide/conf.html#dataSource for documentation
               jmxEnabled = true
               initialSize = 5
               maxActive = 50
               minIdle = 5
               maxIdle = 25
               maxWait = 10000
               maxAge = 10 * 60000
               timeBetweenEvictionRunsMillis = 5000
               minEvictableIdleTimeMillis = 60000
               validationQuery = "SELECT 1"
               validationQueryTimeout = 3
               validationInterval = 15000
               testOnBorrow = true
               testWhileIdle = true
               testOnReturn = false
               jdbcInterceptors = "ConnectionState"
               defaultTransactionIsolation = java.sql.Connection.TRANSACTION_READ_COMMITTED
            }
        }
    }
}

Answer 1

您的 driverClassName 是错误的。对 mysql 使用正确的(在环境中，例如 com.mysql.jdbc.Driver)，您需要 mysql。现在你有:

default: driver=h2, dialect=mysql; 
dev: url=mysql
prod: url=h2

你绝对想清理它。还要确保你的部门有司机。