Mysql 通过vpn从Grails项目连接到远程服务器数据库时，Grails运行应用程序出错

我在印度的一家公司远程工作，通过VPN连接到公司网络进行日常工作

我目前正在本地系统/计算机上实施Grails2.2.4中的一个项目。GGTS中的grails项目在连接到我机器上的本地db时运行良好

但是，当我试图从我的项目开发环境连接到公司网络服务器上托管的数据库时，我收到了很多连接错误，所有这些错误都来自MySQL

我已将DataSource.groovy配置如下：

dataSource {
 pooled = true
 driverClassName="com.mysql.jdbc.Driver"
 dialect = org.hibernate.dialect.MySQL5InnoDBDialect
 username = <username>
 password = <password>
}
hibernate {
 cache.use_second_level_cache = true
 cache.use_query_cache=true
 cache.provider_class='net.sf.ehcache.hibernate.EhCacheProvider'
 cache.region.factory_class = 'net.sf.ehcache.hibernate.EhCacheRegionFactory'
}
environments {
  development {
    dataSource {
        dbCreate = "update"
        url = "jdbc:mysql://<remoteIP-on company network>:3306/<DB_Name>"
        properties{
            initialSize="50"
            maxActive="100"
            minIdle="50"
            maxIdle="75"
            maxWait="30000"
            timeBetweenEvictionRunsMillis="5000"
            minEvictableIdleTimeMillis="60000"
            testWhileIdle="true"
            testOnBorrow="true"
            testOnReturn="true"
            poolPreparedStatements="true"
            maxOpenPreparedStatements="100"
            validationQuery="SELECT 1 FROM DUAL"
            connectionInitSqls="SELECT 1 FROM DUAL"
            logAbandoned="true"
        }
    }
  }
  test {
    dataSource {
        dbCreate = "update"
        url = "jdbc:mysql://<remoteIP-on company network>:3306/<DB_Name>"
        driverClassName="com.mysql.jdbc.Driver"
        username = <username>
        password = <password>
    }
  }
  production {
    dataSource {
        dbCreate = "update"
        jndiName = "java:comp/env/<JNDIName>"
        properties {
         maxActive = 50
            maxIdle = 25
            minIdle = 5
            initialSize = 5
            minEvictableIdleTimeMillis = 60000
            timeBetweenEvictionRunsMillis = 60000
            maxWait = 10000
        }
    }
  }
}

我将mysql-connector-java-5.1.40-bin.jar文件添加到构建路径和/lib/文件夹中

在远程数据库上，通过我机器上的HeidiSQL客户端连接到它，根据我对同一讨论主题的研究，我运行了以下查询

GRANT ALL PRIVILEGES ON <DB_Name>.* TO <username>@'%' IDENTIFIED BY <password>;
FLUSH PRIVILEGES;

将。*上的所有权限授予由标识的@“%”；
同花顺特权；

当我从命令提示符ping到远程服务器时，这也可以正常工作

ping <Remote Server IP>

Pinging <Remote Server IP> with 32 bytes of data:
Reply from <Remote Server IP>: bytes=32 time=261ms TTL=61
Reply from <Remote Server IP>: bytes=32 time=261ms TTL=61
Reply from <Remote Server IP>: bytes=32 time=257ms TTL=61
Reply from <Remote Server IP>: bytes=32 time=257ms TTL=61

Ping statistics for <Remote Server IP>:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 257ms, Maximum = 261ms, Average = 259ms

ping
使用32字节的数据进行ping：
回复自：字节=32时间=261ms TTL=61
回复自：字节=32时间=261ms TTL=61
回复：字节=32时间=257ms TTL=61
回复：字节=32时间=257ms TTL=61
Ping统计数据用于：
数据包：发送=4，接收=4，丢失=0（0%丢失），
以毫秒为单位的近似往返时间：
最小值=257ms，最大值=261ms，平均值=259ms

现在，当我使用GGTS run As->Grails命令（run app）运行应用程序时，我得到以下错误：

| Error 2016-12-13 18:36:05,400 [localhost-startStop-1] ERROR context.GrailsContextLoader  - Error initializing the application: Error creating bean with name 'transactionManagerPostProcessor': Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager': Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory': Cannot resolve reference to bean 'lobHandlerDetector' while setting bean property 'lobHandler'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'lobHandlerDetector': Invocation of init method failed; nested exception is org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.)
Message: Error creating bean with name 'transactionManagerPostProcessor': Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager': Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory': Cannot resolve reference to bean 'lobHandlerDetector' while setting bean property 'lobHandler'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'lobHandlerDetector': Invocation of init method failed; nested exception is org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Communications link failure


The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.)
    Line | Method
->>  334 | innerRun  in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|    166 | run       in java.util.concurrent.FutureTask
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run       in java.util.concurrent.ThreadPoolExecutor$Worker
^    724 | run . . . in java.lang.Thread
Caused by BeanCreationException: Error creating bean with name 'transactionManager': Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory': Cannot resolve reference to bean 'lobHandlerDetector' while setting bean property 'lobHandler'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'lobHandlerDetector': Invocation of init method failed; nested exception is org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.)
->>  334 | innerRun  in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|    166 | run       in java.util.concurrent.FutureTask
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run       in java.util.concurrent.ThreadPoolExecutor$Worker
^    724 | run . . . in java.lang.Thread
Caused by BeanCreationException: Error creating bean with name 'sessionFactory': Cannot resolve reference to bean 'lobHandlerDetector' while setting bean property 'lobHandler'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'lobHandlerDetector': Invocation of init method failed; nested exception is org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.)
->>  334 | innerRun  in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|    166 | run       in java.util.concurrent.FutureTask
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run       in java.util.concurrent.ThreadPoolExecutor$Worker
^    724 | run . . . in java.lang.Thread
Caused by BeanCreationException: Error creating bean with name 'lobHandlerDetector': Invocation of init method failed; nested exception is org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.)
->>  334 | innerRun  in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|    166 | run       in java.util.concurrent.FutureTask
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run       in java.util.concurrent.ThreadPoolExecutor$Worker
^    724 | run . . . in java.lang.Thread
Caused by MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.)
->>  334 | innerRun  in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|    166 | run       in java.util.concurrent.FutureTask
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run       in java.util.concurrent.ThreadPoolExecutor$Worker
^    724 | run . . . in java.lang.Thread
Caused by SQLNestedException: Cannot create PoolableConnectionFactory (Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.)
->> 1549 | createPoolableConnectionFactory in org.apache.commons.dbcp.BasicDataSource
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|   1388 | createDataSource in     ''
|   1044 | getConnection in     ''
|    334 | innerRun  in java.util.concurrent.FutureTask$Sync
|    166 | run . . . in java.util.concurrent.FutureTask
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run . . . in java.util.concurrent.ThreadPoolExecutor$Worker
^    724 | run       in java.lang.Thread
Caused by CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
->>  409 | handleNewInstance in com.mysql.jdbc.Util
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|   1118 | createCommunicationsException in com.mysql.jdbc.SQLError
|    343 | <init> .  in com.mysql.jdbc.MysqlIO
|   2308 | connectOneTryOnly in com.mysql.jdbc.ConnectionImpl
|   2122 | createNewIO in     ''
|    774 | <init>    in     ''
|     49 | <init> .  in com.mysql.jdbc.JDBC4Connection
|    409 | handleNewInstance in com.mysql.jdbc.Util
|    375 | getInstance in com.mysql.jdbc.ConnectionImpl
|    289 | connect   in com.mysql.jdbc.NonRegisteringDriver
|     38 | createConnection in org.apache.commons.dbcp.DriverConnectionFactory
|    582 | makeObject in org.apache.commons.dbcp.PoolableConnectionFactory
|   1556 | validateConnectionFactory in org.apache.commons.dbcp.BasicDataSource
|   1545 | createPoolableConnectionFactory in     ''
|   1388 | createDataSource in     ''
|   1044 | getConnection in     ''
|    334 | innerRun  in java.util.concurrent.FutureTask$Sync
|    166 | run       in java.util.concurrent.FutureTask
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run       in java.util.concurrent.ThreadPoolExecutor$Worker
^    724 | run . . . in java.lang.Thread
Caused by ConnectException: Connection refused: connect
->>   79 | socketConnect in java.net.DualStackPlainSocketImpl
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|    339 | doConnect in java.net.AbstractPlainSocketImpl
|    200 | connectToAddress in     ''
|    182 | connect   in     ''
|    172 | connect . in java.net.PlainSocketImpl
|    392 | connect   in java.net.SocksSocketImpl
|    579 | connect . in java.net.Socket
|    528 | connect   in     ''
|    425 | <init> .  in     ''
|    241 | <init>    in     ''
|    256 | connect . in com.mysql.jdbc.StandardSocketFactory
|    292 | <init>    in com.mysql.jdbc.MysqlIO
|   2308 | connectOneTryOnly in com.mysql.jdbc.ConnectionImpl
|   2122 | createNewIO in     ''
|    774 | <init> .  in     ''
|     49 | <init>    in com.mysql.jdbc.JDBC4Connection
|    409 | handleNewInstance in com.mysql.jdbc.Util
|    375 | getInstance in com.mysql.jdbc.ConnectionImpl
|    289 | connect . in com.mysql.jdbc.NonRegisteringDriver
|     38 | createConnection in org.apache.commons.dbcp.DriverConnectionFactory
|    582 | makeObject in org.apache.commons.dbcp.PoolableConnectionFactory
|   1556 | validateConnectionFactory in org.apache.commons.dbcp.BasicDataSource
|   1545 | createPoolableConnectionFactory in     ''
|   1388 | createDataSource in     ''
|   1044 | getConnection in     ''
|    334 | innerRun  in java.util.concurrent.FutureTask$Sync
|    166 | run . . . in java.util.concurrent.FutureTask
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run . . . in java.util.concurrent.ThreadPoolExecutor$Worker
^    724 | run       in java.lang.Thread

| Error 2016-12-13 18:36:05400[localhost-startStop-1]Error context.grailContextLoader-初始化应用程序时出错：创建名为“transactionManagerPostProcessor”的bean时出错：初始化bean失败；嵌套异常为org.springframework.beans.factory.BeanCreationException:创建名为“transactionManager”的bean时出错：设置bean属性“sessionFactory”时无法解析对bean“sessionFactory”的引用；嵌套异常为org.springframework.beans.factory.BeanCreationException:创建名为“sessionFactory”的bean时出错：设置bean属性“lobHandler”时无法解析对bean“lobHandlerDetector”的引用；嵌套异常为org.springframework.beans.factory.BeanCreationException:创建名为“lobHandlerDetector”的bean时出错：调用init方法失败；嵌套异常为org.springframework.jdbc.support.MetaDataAccessException:提取数据库元数据时出错；嵌套异常为org.apache.commons.dbcp.SQLNestedException:无法创建PoolableConnectionFactory（通信链路故障
成功发送到服务器的最后一个数据包是0毫秒前的。驱动程序尚未从服务器收到任何数据包。）
消息：创建名为“transactionManagerPostProcessor”的bean时出错：bean初始化失败；嵌套异常为org.springframework.beans.factory.BeanCreationException:创建名为“transactionManager”的bean时出错：设置bean属性“sessionFactory”时无法解析对bean“sessionFactory”的引用；嵌套异常为org.springframework.beans.factory.BeanCreationException:创建名为“sessionFactory”的bean时出错：设置bean属性“lobHandler”时无法解析对bean“lobHandlerDetector”的引用；嵌套异常为org.springframework.beans.factory.BeanCreationException:创建名为“lobHandlerDetector”的bean时出错：调用init方法失败；嵌套异常为org.springframework.jdbc.support.MetaDataAccessException:提取数据库元数据时出错；嵌套异常为org.apache.commons.dbcp.SQLNestedException:无法创建PoolableConnectionFactory（通信链路故障
成功发送到服务器的最后一个数据包是0毫秒前的。驱动程序尚未从服务器收到任何数据包。）
直线法
->>334 |在java.util.concurrent.FutureTask$Sync中运行innerRun
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|166 |在java.util.concurrent.FutureTask中运行
|1145 | java.util.concurrent.ThreadPoolExecutor中的runWorker
|615 |在java.util.concurrent.ThreadPoolExecutor$Worker中运行
^724 |跑。在java.lang.Thread中
由BeanCreationException引起：创建名为“transactionManager”的bean时出错：设置bean属性“sessionFactory”时无法解析对bean“sessionFactory”的引用；嵌套异常为org.springframework.beans.factory.BeanCreationException:创建名为“sessionFactory”的bean时出错：设置bean属性“lobHandler”时无法解析对bean“lobHandlerDetector”的引用；嵌套异常为org.springframework.beans.factory.BeanCreationException:创建名为“lobHandlerDetector”的bean时出错：调用init方法失败；嵌套异常为org.springframework.jdbc.support.MetaDataAccessException:提取数据库元数据时出错；嵌套异常为org.apache.commons.dbcp.SQLNestedException:无法创建PoolableConnectionFactory（通信链路故障
成功发送到服务器的最后一个数据包是0毫秒前的。驱动程序尚未从服务器收到任何数据包。）
->>334 |在java.util.concurrent.FutureTask$Sync中运行innerRun
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|166 |在java.util.concurrent.FutureTask中运行
|1145 | java.util.concurrent.ThreadPoolExecutor中的runWorker
|615 |在java.util.concurrent.ThreadPoolExecutor$Worker中运行
^724 |跑。在java.lang.Thread中
由BeanCreationException引起：创建名为“sessionFactory”的bean时出错：设置bean属性“lobHandler”时无法解析对bean“lobHandlerDetector”的引用；嵌套异常为org.springframework.beans.factory.BeanCreationException:创建名为“lobHandlerDetector”的bean时出错：调用init方法失败；嵌套异常为或
| Error 2016-12-13 18:36:05,400 [localhost-startStop-1] ERROR context.GrailsContextLoader  - Error initializing the application: Error creating bean with name 'transactionManagerPostProcessor': Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager': Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory': Cannot resolve reference to bean 'lobHandlerDetector' while setting bean property 'lobHandler'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'lobHandlerDetector': Invocation of init method failed; nested exception is org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.)
Message: Error creating bean with name 'transactionManagerPostProcessor': Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager': Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory': Cannot resolve reference to bean 'lobHandlerDetector' while setting bean property 'lobHandler'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'lobHandlerDetector': Invocation of init method failed; nested exception is org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Communications link failure


The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.)
    Line | Method
->>  334 | innerRun  in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|    166 | run       in java.util.concurrent.FutureTask
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run       in java.util.concurrent.ThreadPoolExecutor$Worker
^    724 | run . . . in java.lang.Thread
Caused by BeanCreationException: Error creating bean with name 'transactionManager': Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory': Cannot resolve reference to bean 'lobHandlerDetector' while setting bean property 'lobHandler'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'lobHandlerDetector': Invocation of init method failed; nested exception is org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.)
->>  334 | innerRun  in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|    166 | run       in java.util.concurrent.FutureTask
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run       in java.util.concurrent.ThreadPoolExecutor$Worker
^    724 | run . . . in java.lang.Thread
Caused by BeanCreationException: Error creating bean with name 'sessionFactory': Cannot resolve reference to bean 'lobHandlerDetector' while setting bean property 'lobHandler'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'lobHandlerDetector': Invocation of init method failed; nested exception is org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.)
->>  334 | innerRun  in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|    166 | run       in java.util.concurrent.FutureTask
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run       in java.util.concurrent.ThreadPoolExecutor$Worker
^    724 | run . . . in java.lang.Thread
Caused by BeanCreationException: Error creating bean with name 'lobHandlerDetector': Invocation of init method failed; nested exception is org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.)
->>  334 | innerRun  in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|    166 | run       in java.util.concurrent.FutureTask
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run       in java.util.concurrent.ThreadPoolExecutor$Worker
^    724 | run . . . in java.lang.Thread
Caused by MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.)
->>  334 | innerRun  in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|    166 | run       in java.util.concurrent.FutureTask
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run       in java.util.concurrent.ThreadPoolExecutor$Worker
^    724 | run . . . in java.lang.Thread
Caused by SQLNestedException: Cannot create PoolableConnectionFactory (Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.)
->> 1549 | createPoolableConnectionFactory in org.apache.commons.dbcp.BasicDataSource
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|   1388 | createDataSource in     ''
|   1044 | getConnection in     ''
|    334 | innerRun  in java.util.concurrent.FutureTask$Sync
|    166 | run . . . in java.util.concurrent.FutureTask
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run . . . in java.util.concurrent.ThreadPoolExecutor$Worker
^    724 | run       in java.lang.Thread
Caused by CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
->>  409 | handleNewInstance in com.mysql.jdbc.Util
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|   1118 | createCommunicationsException in com.mysql.jdbc.SQLError
|    343 | <init> .  in com.mysql.jdbc.MysqlIO
|   2308 | connectOneTryOnly in com.mysql.jdbc.ConnectionImpl
|   2122 | createNewIO in     ''
|    774 | <init>    in     ''
|     49 | <init> .  in com.mysql.jdbc.JDBC4Connection
|    409 | handleNewInstance in com.mysql.jdbc.Util
|    375 | getInstance in com.mysql.jdbc.ConnectionImpl
|    289 | connect   in com.mysql.jdbc.NonRegisteringDriver
|     38 | createConnection in org.apache.commons.dbcp.DriverConnectionFactory
|    582 | makeObject in org.apache.commons.dbcp.PoolableConnectionFactory
|   1556 | validateConnectionFactory in org.apache.commons.dbcp.BasicDataSource
|   1545 | createPoolableConnectionFactory in     ''
|   1388 | createDataSource in     ''
|   1044 | getConnection in     ''
|    334 | innerRun  in java.util.concurrent.FutureTask$Sync
|    166 | run       in java.util.concurrent.FutureTask
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run       in java.util.concurrent.ThreadPoolExecutor$Worker
^    724 | run . . . in java.lang.Thread
Caused by ConnectException: Connection refused: connect
->>   79 | socketConnect in java.net.DualStackPlainSocketImpl
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|    339 | doConnect in java.net.AbstractPlainSocketImpl
|    200 | connectToAddress in     ''
|    182 | connect   in     ''
|    172 | connect . in java.net.PlainSocketImpl
|    392 | connect   in java.net.SocksSocketImpl
|    579 | connect . in java.net.Socket
|    528 | connect   in     ''
|    425 | <init> .  in     ''
|    241 | <init>    in     ''
|    256 | connect . in com.mysql.jdbc.StandardSocketFactory
|    292 | <init>    in com.mysql.jdbc.MysqlIO
|   2308 | connectOneTryOnly in com.mysql.jdbc.ConnectionImpl
|   2122 | createNewIO in     ''
|    774 | <init> .  in     ''
|     49 | <init>    in com.mysql.jdbc.JDBC4Connection
|    409 | handleNewInstance in com.mysql.jdbc.Util
|    375 | getInstance in com.mysql.jdbc.ConnectionImpl
|    289 | connect . in com.mysql.jdbc.NonRegisteringDriver
|     38 | createConnection in org.apache.commons.dbcp.DriverConnectionFactory
|    582 | makeObject in org.apache.commons.dbcp.PoolableConnectionFactory
|   1556 | validateConnectionFactory in org.apache.commons.dbcp.BasicDataSource
|   1545 | createPoolableConnectionFactory in     ''
|   1388 | createDataSource in     ''
|   1044 | getConnection in     ''
|    334 | innerRun  in java.util.concurrent.FutureTask$Sync
|    166 | run . . . in java.util.concurrent.FutureTask
|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor
|    615 | run . . . in java.util.concurrent.ThreadPoolExecutor$Worker
^    724 | run       in java.lang.Thread