spring boot jpa MYSQL教程mysql连接的空闲时间超过8小时后 MySQL自动断开该连接

标签：jpa spring idle datasource timeout MySQL 连接 wait

 

Sun Apr 16 08:15:36 CST 2023
There was an unexpected error (type=Internal Server Error, status=500).
PreparedStatementCallback; SQL [select userId from familyxiao_UserConnection where providerId = ? and providerUserId = ?]; No operations allowed after connection closed.; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.

 

Could not open JPA EntityManager for transaction; nested exception is javax.persistence.PersistenceException: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed."

 

解决这个问题的办法有三种：

1. 增加 MySQL 的 wait_timeout 属性的值.

修改 /etc/mysql/my.cnf文件,在 [mysqld] 节中设置：

# Set a connection to wait 8hours in idle status.
wait_timeout =86400
相关参数,红色部分
mysql> show variables like '%timeout%';
+--------------------------+-------+
| Variable_name | Value |
+--------------------------+-------+
| connect_timeout | 5 |
| delayed_insert_timeout | 300 |
| innodb_lock_wait_timeout | 50 |
| interactive_timeout | 28800 |
| net_read_timeout | 30 |
| net_write_timeout | 60 |
| slave_net_timeout | 3600 |
| wait_timeout | 28800 |
+--------------------------+-------+
同一时间,这两个参数只有一个起作用.到底是哪个参数起作用,和用户连接时指定的连接参数相关,缺省情况下是使用wait_timeout.我建议是将这两个参数都修改,以免引起不必要的麻烦.

这两个参数的默认值是8小时(60*60*8=28800).我测试过将这两个参数改为0,结果出人意料,系统自动将这个值设置为.换句话说,不能将该值设置为永久.
将这2个参数设置为24小时(60*60*24=604800)即可.
set interactive_timeout=604800;
set wait_timeout=604800;

2. 减少连接池内连接的生存周期,使之小于上一项中所设置的 wait_timeout 的值.
修改 c3p0 的配置文件,设置：

# How long to keep unused connections around(in seconds)
# Note: MySQL times out idle connections after 8hours(28,800seconds)
# so ensure this value is below MySQL idle timeout
cpool.maxIdleTime=25200
在 Spring 的配置文件中：

代码如下:
<bean id="dataSource"
class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="maxIdleTime"value="${cpool.maxIdleTime}"/>
<!--other properties -->
</bean>

3. 定期使用连接池内的连接,使得它们不会因为闲置超时而被 MySQL 断开.
修改 c3p0 的配置文件,设置：

# Prevent MySQL raise exception after a long idle timecpool.preferredTestQuery='SELECT 1'cpool.idleConnectionTestPeriod=18000cpool.testConnectionOnCheckout=true
修改 Spring 的配置文件：

代码如下:
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="preferredTestQuery" value="${cpool.preferredTestQuery}"/>
<property name="idleConnectionTestPeriod" value="${cpool.idleConnectionTestPeriod}"/>
<property name="testConnectionOnCheckout" value="${cpool.testConnectionOnCheckout}"/>
<!--other properties --></bean>

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spring boot jpa

spring.datasource.max-active=100
spring.datasource.min-idle=10
spring.datasource.min-evictable-idle-time-millis = 1800000
spring.datasource.test-on-borrow=true
spring.datasource.test-on-return=true
spring.datasource.test-while-idle=true
spring.datasource.validation-query=select 1

 

标签：jpa,spring,idle,datasource,timeout,MySQL,连接,wait
From： https://www.cnblogs.com/xiaoruilin/p/17359771.html