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：驱动程序：org.h2.Driver@78f95cf6为URL返回null：jdbc：mysql：// localhost：3306 / radb？createDatabaseIfNotExist = true

|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的初始化失败;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：init方法的调用失败;嵌套异常是java.lang.NullPointerException

数据库 radb 存在。我已经验证了它

我的Datasource.groovy文件供参考，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错了。使用正确的mysql（在环境中，例如com.mysql.jdbc.Driver），你需要mysql。现在你有：

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

你肯定想要清理它。还要确保，你的司机中有司机。

错误pool.ConnectionPool - 无法创建池

1 个答案: