orgspringframeworkdaoCannotAcquireLockException ### Error updating database Cause commysqlcjjdbcexceptionsMySQLTransactionRollbackException Lock wait timeout exceeded; try restarting transaction

This exception is thrown when a lock wait timeout is exceeded while trying to update the database.

The underlying cause of this exception is a com.mysql.cj.jdbc.exceptions.MySQLTransactionRollbackException, which indicates that a transaction has been rolled back due to the lock wait timeout.

The lock wait timeout occurs when a transaction tries to acquire a lock on a resource that is already locked by another transaction. If the lock is not released within a certain timeout period, the transaction trying to acquire the lock will timeout and throw this exception.

To resolve this issue, you can try the following:

1. Increase the lock wait timeout value in your MySQL configuration. This can be done by setting the innodb_lock_wait_timeout parameter in your MySQL configuration file or by executing the following SQL statement: SET innodb_lock_wait_timeout = <timeout_value>. The default value is usually 50 seconds.

2. Optimize your database queries and transactions to minimize the time required to acquire locks. This can involve reducing the number of locks acquired, improving query performance, or restructuring your transactions.

3. Check for any long-running transactions that might be causing the lock wait timeout. You can use the SHOW ENGINE INNODB STATUS command in MySQL to view the current transaction status and identify any long-running transactions.

4. Consider using a different isolation level for your transactions. Changing the isolation level can affect how locks are acquired and released, potentially reducing the chances of lock wait timeouts. However, be cautious when changing the isolation level, as it can have implications on data consistency and concurrency.

5. If none of the above solutions work, you may need to analyze and optimize your database schema, queries, and transactions to prevent lock conflicts and improve overall performance.

It is also important to note that this issue can be caused by other factors such as resource contention or hardware limitations. In such cases, you may need to investigate and address those underlying issues