07/20 01:38:26 hibernate.util.JDBCExceptionReporter     - Communications link failure

The last packet successfully received from the server was 7.202.618 milliseconds ago.  The last packet sent successfully to the server was 7.202.618 milliseconds ago.

This will show you the current connections:

show status like '%onn%';

Example of output:

mysql> show status like '%onn%';
+--------------------------+-------+
| Variable_name            | Value |
+--------------------------+-------+
| Aborted_connects         | 0     |
| Connections              | 50    |
| Max_used_connections     | 9     |
| Ssl_client_connects      | 0     |
| Ssl_connect_renegotiates | 0     |
| Ssl_finished_connects    | 0     |
| Threads_connected        | 8     |
+--------------------------+-------+
7 rows in set (0.00 sec)

Pay attention to the data “Threads_connected”, which is similar to the result of the show processlist.

show variables like "max_connections";

mysql> show variables like '%imeout%';
+----------------------------+----------+
| Variable_name              | Value    |
+----------------------------+----------+
| connect_timeout            | 10       |
| delayed_insert_timeout     | 300      |
| innodb_lock_wait_timeout   | 50       |
| innodb_rollback_on_timeout | OFF      |
| interactive_timeout        | 28800    |
| lock_wait_timeout          | 31536000 |
| net_read_timeout           | 30       |
| net_write_timeout          | 60       |
| slave_net_timeout          | 3600     |
| wait_timeout               | 28800    |
+----------------------------+----------+
10 rows in set (0.00 sec)