Here are a few title options, focusing on the question-answer format and encompassing the article\'s content: **Option 1 (Focus on the Error):** * **Spring Boot JPA/Hibernate: How to Fix \'Co

Connection Timeout in Spring Boot with JPA and Hibernate

When utilizing Spring Boot with JPA-Hibernate and MySQL, you may encounter the following error:

Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 56,006,037 milliseconds ago.  The last packet sent successfully to the server was 56,006,037 milliseconds ago. is longer than the server configured value of 'wait_timeout'.

This issue arises due to prolonged inactivity in the connection,導致伺服器終止連線。

Unrecommended Solution

One common yet discouraged approach is to enable connection testing on borrow:

spring.datasource.testOnBorrow=true
spring.datasource.validationQuery=SELECT 1

Recommended Solution

A more comprehensive solution involves:

• Setting the spring.datasource.url to include the autoReconnect property:

  spring.datasource.url = jdbc:mysql://localhost:3306/test?autoReconnect=true

• Specifying maximum active connections:

  spring.datasource.max-active=10

• Specifying initial connections:

  spring.datasource.initial-size=5

• Setting maximum and minimum idle connections:

  spring.datasource.max-idle=5
  spring.datasource.min-idle=1

• Enabling connection validation:

  spring.datasource.test-while-idle=true
  spring.datasource.test-on-borrow=true

• Specifying the validation query and idle connection timeout:

  spring.datasource.validation-query=SELECT 1
  spring.datasource.time-between-eviction-runs-millis=5000
  spring.datasource.min-evictable-idle-time-millis=60000

Note for HikariCP

In Spring Boot 2.x, the connection pool has been switched to HikariCP. Refer to the HikariCP documentation for further configuration options.

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