javasqlSQLNonTransientConnectionException Data source rejected establishment of connection message from server Too many connections

This exception is thrown when a Java program attempts to establish a connection with a database, but the database server rejects the connection due to the number of open connections exceeding the limit.

The error message "Too many connections" indicates that the database is overloaded with too many active connections, and it cannot accept any more connections at the moment. This can happen when there are too many applications or processes trying to access the database simultaneously, or when the database is not configured to handle a large number of connections.

To resolve this issue, you can try the following steps:

1. Increase the maximum number of connections allowed by the database server configuration.
2. Close any unused connections in your Java code to free up resources.
3. Use connection pooling to manage connections efficiently and avoid creating too many connections.
4. Optimize your database queries and reduce the number of queries to reduce the load on the database server.
5. Consider upgrading your hardware or using a more powerful database server to handle larger loads