我在ubuntu上的tomcat 7上运行web应用程序并连接到同一台机器上的mysql数据库。管理我使用Hikari数据源的连接,我使用Hibernate作为ORM。
运行服务器几天后,我开始在日志文件中出现以下问题,所有请求都开始失败
Caused by: com.mysql.jdbc.PacketTooBigException: Packet for query is too large (1317 > 1024). You can change this value on the server by setting the max_allowed_packet' variable.
我在mysql服务器中设置了max allowed packet变量,如下所示[mysqld]部分。
key_buffer = 16M
max_allowed_packet = 200M
thread_stack = 192K
thread_cache_size = 8
但是我几天仍然会遇到这个问题而且我需要重新启动tomcat,有时候还需要重启mysql服务器,一旦重新启动它再运行几天。
在客户实体经理工厂,我有以下
<property name="dataSource" ref="dataSource" />
<property name="packagesToScan" value="com.***" />
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"
p:databasePlatform="org.hibernate.dialect.MySQL5InnoDBDialect"
p:showSql="false" />
</property>
<property name="jpaDialect">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaDialect" />
</property>
<property name="jpaPropertyMap">
<map>
<entry key="javax.persistence.validation.factory" value-ref="validator" />
<entry key="hibernate.archive.autodetection" value="false" />
<entry key="hibernate.format_sql" value="false" />
<entry key="hibernate.generate_statistics" value="false" />
<entry key="hibernate.hbm2ddl.auto" value="${hibernate.hbm2ddl.auto}" />
<entry key="hibernate.connection.charSet" value="UTF-8" />
<entry key="hibernate.bytecode.use_reflection_optimizer"
value="true" />
<entry key="hibernate.jdbc.use_scrollable_resultset" value="false" />
<entry key="hibernate.jdbc.use_streams_for_binary" value="true" />
<entry key="hibernate.jdbc.fetch_size" value="10" />
<entry key="hibernate.jdbc.batch_size" value="30" />
<entry key="hibernate.jdbc.batch_versioned_data" value="true" />
<entry key="hibernate.default_batch_fetch_size" value="16" />
<entry key="hibernate.order_inserts" value="true" />
<entry key="hibernate.order_updates" value="true" />
<entry key="hibernate.connection.max_allowed_packet" value="16905662" />
</map>
</property>
</bean>
我已经遵循了一些指南并配置了max_allowed_packet。但仍然遇到同样的问题。我在这里做错了吗?