WARN SqlExceptionHelper：143 - SQL錯誤：0，SQLSTATE：08S01- SqlExceptionHelper：144 - 通信鏈路故障

我有問題，休眠（休眠核-4.1.9.Final.jar）WARN SqlExceptionHelper：143 - SQL錯誤：0，SQLSTATE：08S01- SqlExceptionHelper：144 - 通信鏈路故障

當我測試冬眠在循環中的所有工作的罰款：

for(int i=0;i<1500;i++){ 

    UserDAO.getInstance.getById(1); 
}

當我添加Thread.sleep（）方法在for循環

for(int i=0;i<1500;i++){ 


     UserDAO.getInstance.getById(1); 
     Thread.sleep(60000); 
}

分鐘210

後1，我得到異常：

00:20:06,447 WARN SqlExceptionHelper:143 - SQL Error: 0, SQLState: 08S01 
00:20:06,448 ERROR SqlExceptionHelper:144 - Communications link failure 

The last packet successfully received from the server was 120,017 milliseconds ago. The last packet sent successfully to the server was 9 milliseconds ago. 
Exception in thread "main" org.hibernate.exception.JDBCConnectionException: Communications link failure 

The last packet successfully received from the server was 120,017 milliseconds ago. The last packet sent successfully to the server was 9 milliseconds ago. 
    at org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.java:131) 
    at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49) 
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125) 
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:110) 
    at org.hibernate.engine.jdbc.internal.proxy.AbstractStatementProxyHandler.continueInvocation(AbstractStatementProxyHandler.java:129) 
    at org.hibernate.engine.jdbc.internal.proxy.AbstractProxyHandler.invoke(AbstractProxyHandler.java:81) 
    at sun.proxy.$Proxy11.executeQuery(Unknown Source) 
    at org.hibernate.loader.Loader.getResultSet(Loader.java:2031) 
    at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1832) 
    at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1811) 
    at org.hibernate.loader.Loader.doQuery(Loader.java:899) 
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:341) 
    at org.hibernate.loader.Loader.doList(Loader.java:2516) 
    at org.hibernate.loader.Loader.doList(Loader.java:2502) 
    at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2332) 
    at org.hibernate.loader.Loader.list(Loader.java:2327) 
    at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:124) 
    at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1621) 
    at org.hibernate.internal.CriteriaImpl.list(CriteriaImpl.java:374) 
    at org.hibernate.internal.CriteriaImpl.uniqueResult(CriteriaImpl.java:396) 
    at com.fit.utilities.BaseDAO.getById(BaseDAO.java:35) 
    at com.fit.test.Testiranje.main(Testiranje.java:51) 
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure 

The last packet successfully received from the server was 120,017 milliseconds ago. The last packet sent successfully to the server was 9 milliseconds ago. 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) 
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) 
    at java.lang.reflect.Constructor.newInstance(Unknown Source) 
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:411) 
    at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1121) 
    at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3603) 
    at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3492) 
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4043) 
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2503) 
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2664) 
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2815) 
    at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2155) 
    at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2322) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
    at java.lang.reflect.Method.invoke(Unknown Source) 
    at org.hibernate.engine.jdbc.internal.proxy.AbstractStatementProxyHandler.continueInvocation(AbstractStatementProxyHandler.java:122) 
    ... 17 more 
Caused by: java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost. 
    at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:3052) 
    at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3503) 
    ... 29 more

這裏是我的hibernate.cfg.xml中

<?xml version='1.0' encoding='UTF-8'?> 
<!DOCTYPE hibernate-configuration PUBLIC 
      "-//Hibernate/Hibernate Configuration DTD 3.0//EN" 
      "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> 

<hibernate-configuration> 

    <session-factory> 


     <property name="connection.driver_class">com.mysql.jdbc.Driver</property> 
      <property name="connection.url">jdbc:mysql://xxxxxx:3306/xxxx</property> 
      <property name="connection.username">xxxx</property> 
      <property name="connection.password">xxxx</property> 
      <property name="dialect">org.hibernate.dialect.MySQLDialect</property> 
      <property name="hibernate.hbm2ddl.auto">update</property> 
      <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property> 
      <property name="show_sql">false</property> 
      <property name="hibernate.connection.pool_size">1</property> 





     <!-- Mapping files --> 
     <mapping class="com.xxx.model.xxxxx" /> 
     <mapping class="com.xxx.model.xxxxx" /> 
     <mapping class="com.xxx.model.xxxxx" /> 

    </session-factory> 
</hibernate-configuration>

如何解決這個問題呢？

更新： 我想我解決問題。

我把這個在hibernate.cfg.xml

<!-- configuration pool via c3p0--> 
<property name="c3p0.acquire_increment">1</property> 
<property name="c3p0.idle_test_period">100</property> <!-- seconds --> 
<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> <!-- seconds -->

來源

2013-04-01 Haris Dautović

你有沒有找到解決方案？我在製作中遇到類似的錯誤消息。我無法弄清楚是什麼導致了系統似乎正在工作 – Kris

是的，我找到解決方案..我會發布答案。 –

因爲MySQL服務器變量time_out的較小值出現的錯誤。實際上，因爲jdbc連接過期了。

在我的情況TIME_OUT被設置爲1分鐘。使用C3PO池機制，我們可以優化JDBC連接。

您可以從http://sourceforge.net/projects/c3p0/

我使用冬眠3.0下載C3P0庫。

這裏是代碼：

的hibernate.cfg.xml

<?xml version='1.0' encoding='UTF-8'?> 
<!DOCTYPE hibernate-configuration PUBLIC 
      "-//Hibernate/Hibernate Configuration DTD 3.0//EN" 
      "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> 

<hibernate-configuration> 

    <session-factory> 

     <property name="connection.driver_class">com.mysql.jdbc.Driver</property> 
      <property name="connection.url">jdbc:mysql://databasehost:3306/databasename</property> 
      <property name="connection.username">user</property> 
      <property name="connection.password">psw</property> 
      <property name="dialect">org.hibernate.dialect.MySQLDialect</property> 
      <property name="hibernate.hbm2ddl.auto">update</property> 

      <property name="show_sql">false</property> 

    <!-- 
      hibernate c3p0 settings 
     --> 

     <property name="connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property> 
     <property name="hibernate.c3p0.acquire_increment">3</property> 
     <property name="hibernate.c3p0.idle_test_period">10</property> 
     <property name="hibernate.c3p0.min_size">5</property> 
     <property name="hibernate.c3p0.max_size">75</property> 
     <property name="hibernate.c3p0.max_statements">10</property> 
     <property name="hibernate.c3p0.timeout">50</property> 
     <property name="hibernate.c3p0.preferredTestQuery">select 1</property> 
     <property name="hibernate.c3p0.testConnectionOnCheckout">true</property> 

     <!-- Mapping files --> 
     <mapping class="xxx.xxx.xxx.xxx" /> 
     <mapping class="xxx.xxx.xxx.xxx" /> 
     <mapping class="xxx.xxx.xxx.xxx" /> 
     <mapping class="xxx.xxx.xxx.xxx" /> 


    </session-factory> 
</hibernate-configuration>

PersistenceManager.java

import java.io.PrintStream; 
import org.hibernate.SessionFactory; 
import org.hibernate.cfg.AnnotationConfiguration; 
import org.hibernate.cfg.Configuration; 

public class PersistenceManager 
{ 
    private static SessionFactory sessionFactory = null; 

    private static PersistenceManager singleton = null; 

    public static PersistenceManager getInstance() 
    { 
    if (singleton == null) 
    { 
     singleton = new PersistenceManager(); 
    } 

    return singleton; 
    } 

    public SessionFactory getSessionFactory() 
    { 
    if (sessionFactory == null) 
     createSessionFactory(); 
    return sessionFactory; 
    } 

    protected void createSessionFactory() 
    {  
    sessionFactory = new AnnotationConfiguration().configure() 
     .buildSessionFactory(); 
    } 

    public void destroySessionFactory() 
    { 
    if (sessionFactory != null) 
    { 
     sessionFactory.close(); 
     sessionFactory = null; 
    } 
    } 
}

實施例1：

import org.hibernate.HibernateException; 
import org.hibernate.Query; 
import org.hibernate.Session; 

public Users Login(String username, String password) 
    { 
    Session session = null; 
    try 
    { 
     String hql = "select u from Users u where u.username like :p1 and u.password like :p2"; 
     session = PersistenceManager.getInstance().getSessionFactory().openSession(); 

     Query q = session.createQuery(hql) 
     .setParameter("p1", username) 
     .setParameter("p2", password); 

     if (q.list().size() == 0) 
     { 
     session.close(); 
     return new Users(); 
     } 

     Users user = (Users)q.list().get(0); 
     session.close(); 
     return user; 
    } 
    catch (Exception e) 
    { 
     session.close(); 

    } 
    }

例2：

import org.hibernate.HibernateException; 
import org.hibernate.Query; 
import org.hibernate.Session; 
public String Registration(Users u) { 

    Session session = null; 
    try 
    { 
     String hql = "select u from Users u where u.username like :p1"; 

     session = PersistenceManager.getInstance().getSessionFactory().openSession(); 

     Query q = session.createQuery(hql).setParameter("p1", u.getUsername()); 

     if (q.list().size() == 0) 
     { 
     session.beginTransaction(); 
     session.persist(u); 
     session.getTransaction().commit(); 
     session.close(); 
     return new Boolean(true).toString(); 
     } 

     session.close(); 

     return new Boolean(false).toString(); 
    } 
    catch (Exception e) 
    { 
     return e.toString(); 
    } 
    }

來源

2013-05-12 06:58:48

你介意發佈你的my.cnf嗎？我之前有過這些超時問題，並且能夠通過使用my.cnf來修復它。我的託管公司升級了我的服務器，並確實保留了我的MySQL配置，現在我已經返回錯誤，不能記得我做了什麼 – Kris

+1，幫助我節省了大量的頭髮調試！ –

我只是因爲我忘了我的包裹Hibernate代碼在一個事務中同樣的問題。顯然，直到您提交事務後，連接到數據庫纔會關閉。這裏是一個有效的例子：

Session session = HibernateUtils.getSession(); 
Transaction tx = session.beginTransaction(); 
Category cat = null; 

try{ 
    cat = (Category)session.get(Category.class, 1); 
    tx.commit(); 
}catch(Exception ex){ 
    tx.rollback(); 
}finally{   
    session.close(); 
} 

return cat;

來源

2013-07-14 19:48:59 pubsy

WARN SqlExceptionHelper：143 - SQL錯誤：0，SQLSTATE：08S01- SqlExceptionHelper：144 - 通信鏈路故障

回答

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