org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:
Error querying database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Could not create connection to database server.)
The error may exist in file [D:\chatroom2\WebChat-master\target\webchat\WEB-INF\classes\com\amayadream\webchat\mapping\UserMapper.xml]
The error may involve com.amayadream.webchat.dao.IUserDao.selectUserByUserid
The error occurred while executing a query
Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Could not create connection to database server.)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:868)
.......
org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Could not create connection to database server.)
org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80)
org.mybatis.spring.transaction.SpringManagedTransaction.openConnection(SpringManagedTransaction.java:82)
....
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
java.lang.NullPointerException
com.mysql.jdbc.ConnectionImpl.getServerCharset(ConnectionImpl.java:3299)
com.mysql.jdbc.MysqlIO.sendConnectionAttributes(MysqlIO.java:1967)
com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1893)
com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1287)
