Could not open Hibernate Session for transaction . or java.net.SocketException: Broken pipe

Could not open Hibernate Session for transaction

最近做一个项目,布暑后出现"Could not open Hibernate Session for transaction",大意是数据库连接超时,需要设置重连.在这里转一个网上找的解决方案:

spring2.x+hibernate3+struts2 在首次登陆系统时抛出的异常，再登陆就正常。

异常：

javax.servlet.ServletException: org.springframework.transaction.CannotCreateTransactionException: Could not open Hibernate Session for transaction; nested exception is org.hibernate.TransactionException: JDBC begin failed:

root cause

org.springframework.transaction.CannotCreateTransactionException: Could not open Hibernate Session for transaction; nested exception is org.hibernate.TransactionException: JDBC begin failed:

解决方案：

1.

给jdbc url 增加 autoReconnect=true 一定能解决你的问题，可以定期观察一下 show processlist

改进方法如下：

<property name="url" value="jdbc:mysql://localhost/数据库实例名称?&useUnicode=true&characterEncoding=utf-8&autoReconnect=true"/>

2.

寻找支持重连的连接池。

注意：c3p0连接池支持重连;重连参数是:

idleConnectionTestPeriod 设置空闲连接测试周期

preferredTestQuery : 设置一查询语句，用于重连测试

testConnectionOnCheckin设置为true

testConnectionOnCheckout设置为true

在sessionFactory里配置：

<property name="hibernateProperties">

<props>

<prop key="hibernate.autoReconnect">true</prop>

</props>

</property>

上文转自：/article/10024708.html

解决java.net.SocketException: Broken pipe异常

出现如下异常 解决的方式加上粗体到ＵＲＬ jdbc:mysql://localhost:3306/mydatabase? autoReconnect=true %26amp;amp; useUnicode=true%26amp;amp;characterEncoding=gb2312 Last packet sent to the server was 1 ms ago. STACKTRACE: com
　　出现如下异常

解决的方式加上粗体到ＵＲＬ

jdbc:mysql://localhost:3306/mydatabase?autoReconnect=true%26amp;amp;

useUnicode=true%26amp;amp;characterEncoding=gb2312

Last packet sent to the server was 1 ms ago.

STACKTRACE:

com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception:

** BEGIN NESTED EXCEPTION **

java.net.SocketException

MESSAGE: Broken pipe

STACKTRACE:

java.net.SocketException: Broken pipe

at java.net.SocketOutputStream.socketWrite0(Native Method)

at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)

at java.net.SocketOutputStream.write(SocketOutputStream.java:136)

at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)

at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:123)

at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:2692)

at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:2621)

at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1552)

at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1666)

at com.mysql.jdbc.Connection.execSQL(Connection.java:2994)

at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:936)

at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1030)

at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:139)

at org.hibernate.loader.Loader.getResultSet(Loader.java:1669)

at org.hibernate.loader.Loader.doQuery(Loader.java:662)

at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)

at org.hibernate.loader.Loader.loadEntity(Loader.java:1785)

项目中：/etc/my.cnf中增加：wait_timeout=864000

上文转自：http://sumdwang.blog.163.com/blog/static/79296950200911162150831/