SSH configuration framework --Hibernate

problem:

Mysql database connection error Connections could not be acquired from the underlying database!

Resolution process:

1. Check Hibernate.cfg.xml profile driver, URL, username and password are not the problem

2. Check the drive, no problem

3. do sql connection test, the connection is successful

Import java.sql.DriverManager; 

public  class sqltest {
     Private  static String url = "jdbc: MySQL: // localhost: port number / database name"; // database services address 
    Private  static String Driver = "com.mysql.jdbc.Driver "; // drive path 
    Private  static String username =" the root " ;
     Private  static String password =" password " ; 
    
    public  static  void main (String [] args) throws Exception { 
        the Class.forName (driver) .newInstance (); 

        // if the connection is successful, the print connection
        System.out.println(DriverManager.getConnection(url, username, password));
        
    }
}

4. Carefully error View: find such a

Caused by: com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acquire a resource from its primary factory or source.

 Unable to get resource pooling resources from its main factory or source, database connection test successful

Description resource pool may be the problem, refer to the blogger 's practice, thus replacing the resource pool jar package, failed.

5.https://blog.csdn.net/qinguanglong6606/article/details/100560901

Most of the night, tiring of [your hands], then stand tomorrow.

the reason:

solution: