tomcat server:Unable to create initial connections of pool. java.sql.SQLExceptio

应用服务器为tomcat7，在应用的context.xml中声明了type为javax.sql.DataSource的jndi数据源，访问页面报错，错误信息如下：

Mar 25, 2016 11:13:13 AM org.apache.tomcat.jdbc.pool.ConnectionPool init
SEVERE: Unable to create initial connections of pool.
java.sql.SQLException: com.mysql.jdbc.Driver
        at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:254)
        at org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:182)
        at org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection(ConnectionPool.java:706)
        at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:640)
        at org.apache.tomcat.jdbc.pool.ConnectionPool.init(ConnectionPool.java:485)
        at org.apache.tomcat.jdbc.pool.ConnectionPool.<init>(ConnectionPool.java:143)
        at org.apache.tomcat.jdbc.pool.DataSourceProxy.pCreatePool(DataSourceProxy.java:116)
        at org.apache.tomcat.jdbc.pool.DataSourceProxy.createPool(DataSourceProxy.java:103)
        at org.apache.tomcat.jdbc.pool.DataSourceProxy.getConnection(DataSourceProxy.java:127)
        at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111)
        at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77)
        at org.mybatis.spring.transaction.SpringManagedTransaction.openConnection(SpringManagedTransaction.java:81)
        at org.mybatis.spring.transaction.SpringManagedTransaction.getConnection(SpringManagedTransaction.java:67)
        at org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:279)
        at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:72)
        at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:59)
        at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:267)
        at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:137)
        at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:96)
        at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:77)
        at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:108)
        at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:102)
        at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:66)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:358)
        at com.sun.proxy.$Proxy12.selectOne(Unknown Source)
        at org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:163)
        at com.kingdee.mt.tenant.dao.MtUserDAOImp.findByOpenId(MtUserDAOImp.java:56)
        at com.kingdee.mt.tenant.service.MtUserServiceImpl.findByOpenId(MtUserServiceImpl.java:67)
        at com.kingdee.web.actions.yzj.LoadingAction.execute(LoadingAction.java:91)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:870)
        at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1293)
        at ognl.ObjectMethodAccessor.callMethod(ObjectMethodAccessor.java:68)
        at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethodWithDebugInfo(XWorkMethodAccessor.java:117)
        at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethod(XWorkMethodAccessor.java:108)
        at ognl.OgnlRuntime.callMethod(OgnlRuntime.java:1369)
        at ognl.ASTMethod.getValueBody(ASTMethod.java:90)
        at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
        at ognl.SimpleNode.getValue(SimpleNode.java:258)
        at ognl.Ognl.getValue(Ognl.java:494)
        at ognl.Ognl.getValue(Ognl.java:458)
        at com.opensymphony.xwork2.ognl.OgnlUtil$2.execute(OgnlUtil.java:309)
        at com.opensymphony.xwork2.ognl.OgnlUtil.compileAndExecute(OgnlUtil.java:340)
        at com.opensymphony.xwork2.ognl.OgnlUtil.getValue(OgnlUtil.java:307)
        at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:423)
        at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:287)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:250)
        at org.apache.struts2.interceptor.DeprecationInterceptor.intercept(DeprecationInterceptor.java:41)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
        at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
        at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:167)
        at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
        at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)

在tomcat7的文档“jndi-resources-howto”中有一段

引用

Use of the JDBC Data Sources JNDI Resource Factory requires that you make an appropriate JDBC driver available to both Tomcat internal classes and to your web application. This is most easily accomplished by installing the driver's JAR file(s) into the $CATALINA_HOME/lib directory, which makes the driver available both to the resource factory and to your application.

意思是说 不仅应用的lib下要有jdbc驱动，tomcat的lib下也要有jdbc驱动