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我有一个问题，我们只能在生产服务器上重现。这是堆栈跟踪：

Caused by: org.hibernate.exception.JDBCConnectionException: could not execute query
    at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:74)
    at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
    at org.hibernate.loader.Loader.doList(Loader.java:2214)
    at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2095)
    at org.hibernate.loader.Loader.list(Loader.java:2090)
    at org.hibernate.loader.custom.CustomLoader.list(CustomLoader.java:289)
    at org.hibernate.impl.SessionImpl.listCustomQuery(SessionImpl.java:1695)
    at org.hibernate.impl.AbstractSessionImpl.list(AbstractSessionImpl.java:142)
    at org.hibernate.impl.SQLQueryImpl.list(SQLQueryImpl.java:152)
    at com.dir.web.beans.clientpartners.dao.DaoClientPartnerImpl.getBrandAssignments(DaoClientPartnerImpl.java:268)
    ... 46 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

Last packet sent to the server was 0 ms ago.
    at sun.reflect.GeneratedConstructorAccessor143.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
    at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1074)
    at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3134)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1818)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1961)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2543)
    at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1737)
    at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1888)
    at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeQuery(NewProxyPreparedStatement.java:76)
    at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:186)
    at org.hibernate.loader.Loader.getResultSet(Loader.java:1778)
    at org.hibernate.loader.Loader.doQuery(Loader.java:662)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
    at org.hibernate.loader.Loader.doList(Loader.java:2211)
    ... 53 more
Caused by: java.net.SocketException: Software caused connection abort: socket write error
    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:3119)
    ... 64 more

您可以看到引发异常的代码：

public List<BrandAssignment> getBrandAssignments(String query) throws ClientPartnerException {
    Validate.notEmpty(query, "The query cannot be empty or null");
    List<BrandAssignment> brandAssignments = null;

    try {
        brandAssignments = getCurrentSession().createSQLQuery(query).addEntity(BrandAssignment.class).list();
        getCurrentSession().close();
    } catch (HibernateException hibernateException) {
        throw new ClientPartnerException("Error getting brand assignments with query: " + query, hibernateException);
    }

    return brandAssignments;

}

getCurrentSession 方法基本上向会话工厂询问当前会话，如果之前没有人启动它，则开始一个事务。

这是我对 Hibernate 的配置：

    <property name="c3p0.acquire_increment">1</property>
    <property name="c3p0.idle_test_period">5</property>
    <property name="c3p0.max_size">100</property>
    <property name="c3p0.max_statements">0</property>
    <property name="c3p0.min_size">10</property>
    <property name="c3p0.timeout">100</property>

    <property name="current_session_context_class">thread</property>

    <!-- SQL dialect -->
    <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

    <!-- Disable the second-level cache -->
    <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

查询如下所示：

SELECT DISTINCT brand_assig.brand_assignment_id, brand_assignment_name, brand_assig.date_created, brand_assig.date_modified, brand_assig.modified_by, brand_assig.client_division_id, brand_assig.business_category, brand_assig.country, brand_assig.region, brand_assig.office_alias, brand_assig.assignment_start_date, brand_assig.assignment_end_date, brand_assig.assignment_status, brand_assig.industry_experience, brand_assig.description, brand_assig.communication_disciplines, brand_assig.client_type 
FROM clnt_parent INNER JOIN clnt_partner INNER JOIN clnt_div INNER JOIN brand_assig 
ON client_division.client_division_id = brand_assig.client_division_id AND    client_partner.client_partner_id = client_division.client_partner_id AND    client_parent.client_parent_id = client_partner.client_parent_id 
WHERE ( MATCH (client_partner_name) AGAINST ('+nutrition*'IN BOOLEAN MODE) OR MATCH (client_parent_name) AGAINST ('+nutrition*'IN BOOLEAN MODE) OR MATCH (client_division_name) AGAINST ('+nutrition*'IN BOOLEAN MODE) OR MATCH (brand_assignment_name, industry_experience) AGAINST ('+nutrition*'IN BOOLEAN MODE)) AND brand_assig.assignment_end_date IS NOT NULL 
ORDER BY client_partner.client_partner_name

问题是我无法在开发环境中重现错误以测试解决方案，并且我不确定是什么导致了问题，因为我检查了配置并且似乎很好。查看为 MySql 服务器设置的超时默认设置为 8 小时。该错误在产品中经常发生，但从未在开发环境中发生。任何人都知道可能导致错误的原因以及如何重现此错误？任何可能的解决方案？谢谢！

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