Communications Link Failure: Trouble with Mybatis and Spring Update
This error, "com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure," occurs when a MySQL connection unexpectedly drops, resulting in an interruption between the client and the database server. This problem can arise in various scenarios, including MyBatis and Spring updates.
The error stack trace provided indicates that the issue is occurring during an update of a record using MyBatis and Spring. The exception message, "Communications link failure," suggests that the connection to the database has been lost. This could be due to several reasons, such as:
Solution:
To resolve this issue, consider implementing one of the following strategies:
1. Increase MySQL Timeout:
Edit the MySQL configuration file (my.ini) and increase the timeout values. For example:
interactive_timeout=3600 wait_timeout=3600 connect_timeout=3600
2. Adjust Connection Pool Idle Time:
Reduce the idle time in your connection pool to ensure the database closes idle connections before they time out. This can be configured in your Spring application's data source properties. For example:
spring.datasource.max-idle = 10
3. Add Validate Connection Query:
Add a validate connection query to your connection pool configuration. This will test each connection before using it, but it may introduce some performance overhead:
spring.datasource.validation-query = SELECT 1
By implementing one of these solutions, you can prevent the connection from dropping unexpectedly and ensure that your MyBatis and Spring update operations complete successfully.
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