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從基礎資料庫，無法獲取連線，無法連線到資料庫。

嚴重: StandardWrapper.Throwable

org.springframework.transaction.CannotCreateTransactionException: Could not open JDBC Connection for transaction; nested exception is java.sql.SQLException: Connections could not be acquired from the underlying database!
 at org.springframework.jdbc.datasource.DataSourceTransactionManager.doBegin(DataSourceTransactionManager.java:241)
 at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:372)
 at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:417)
 at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:255)
 at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
 at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:633)
 at com.xinghe.base.service.PlatformManager EnhancerBySpringCGLIB EnhancerBySpringCGLIB 9ad1dc7.getPlarMark(<generated>)
 at com.xinghe.base.web.init.BaseDataServlet.init(BaseDataServlet.java:73)
 at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1284)
 at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1197)
 at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1087)
 at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5210)
 at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5493)
 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
 at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
 at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
 at java.util.concurrent.FutureTask.run(Unknown Source)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

 at java.lang.Thread.run(Unknown Source)

以上問題可能有一下原因造成：

1、驅動配置有誤：driver=com.mysql.jdbc.Driver
2、資料庫連線地址有誤：url=jdbc:mysql://localhost:3306/test?3useUnicode=true&characterEncoding=utf8
3、密碼或帳號有誤：username=root，password=root

4、資料庫未啟動或無權訪問

5、專案未引入對應的驅動jar包mysql-connector-java-5.1.6-bin.jar

6、mysql root沒有遠端訪問的許可權，需要增加許可權：
請參考：CentOS6.5下通過Shell修改MySQL初始密碼，開啟遠端登入，授權遠端登入使用者

7、防火牆原因

請參考：連線MySQL錯誤:Can't connect to MySQL server (10060)

           

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