###使用alibaba druid作為數據源連接MySQL時，啟動項目報告如下錯誤

2016-05-16 16:48:26,512 WARN [com.alibaba.druid.pool.vendor.MySqlValidConnectionChecker] - Cannot resolve com.mysq.jdbc.Connection.ping method. Will use 'SELECT 1' instead.

java.lang.NullPointerException

at com.alibaba.druid.pool.vendor.MySqlValidConnectionChecker.(MySqlValidConnectionChecker.java:50)

at com.alibaba.druid.pool.DruidDataSource.initValidConnectionChecker(DruidDataSource.java:892)

at com.alibaba.druid.pool.DruidDataSource.init(DruidDataSource.java:608)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:497)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeCustomInitMethod(AbstractAutowireCapableBeanFactory.java:1640)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1581)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1511)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:521)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)

at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:293)

at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)

at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:290)

at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:191)

at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:636)

at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:934)

at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)

at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:410)

at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)

at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:112)

at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4887)

at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5381)

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(FutureTask.java:266)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

at java.lang.Thread.run(Thread.java:745)

###經調試發現將數據庫驅動版本由原來的_5.1.9_更改為_5.1.38_后問題不再出現 ###所以可能是數據庫驅動版本造成的此問題

mysql

mysql-connector-java

5.1.38

###druid配置如下

總結

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