Ste*_*ane 7 mysql connection timeout c3p0
我的 Spring Hibernate Web 应用程序在 MySQL 上运行，这给我带来了麻烦。
我四处搜索并尝试了不同的配置，在这个网站上阅读了很多线程，但它仍然会弹出它的笑脸。
错误信息是： Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: 从服务器成功接收的最后一个数据包是 63,313,144 毫秒前。最后一个成功发送到服务器的数据包是在 63,313,144 毫秒之前。比服务器配置的“wait_timeout”值长。您应该考虑在应用程序中使用之前使连接有效性过期和/或测试连接有效性，增加客户端超时的服务器配置值，或使用连接器/J 连接属性“autoReconnect=true”来避免此问题。
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 63,313,144 milliseconds ago. The last packet sent successfully to the server was 63,313,144 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:408)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1137)
at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3965)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2578)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2758)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2820)
at com.mysql.jdbc.ConnectionImpl.setAutoCommit(ConnectionImpl.java:5359)
at net.sf.log4jdbc.ConnectionSpy.setAutoCommit(ConnectionSpy.java:764)
at com.mchange.v2.c3p0.impl.NewProxyConnection.setAutoCommit(NewProxyConnection.java:912)
at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.doBegin(JdbcTransaction.java:72)
at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.begin(AbstractTransactionImpl.java:162)
at org.hibernate.internal.SessionImpl.beginTransaction(SessionImpl.java:1435)
at org.hibernate.jpa.internal.TransactionImpl.begin(TransactionImpl.java:61)
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.beginTransaction(HibernateJpaDialect.java:159)
at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:380)
... 46 more
Caused by: java.net.SocketException: Broken pipe
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:113)
at java.net.SocketOutputStream.write(SocketOutputStream.java:159)
at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3946)
... 58 more
MySQL wait_timeout 值为 28800。
我的数据源、c3p0 和 Hibernate 配置是：
@Bean
public DataSource dataSource() throws PropertyVetoException {
ComboPooledDataSource dataSource = new ComboPooledDataSource();
dataSource.setDriverClass(databaseProperties.getHibernateDriverClassName());
dataSource.setJdbcUrl(databaseProperties.getDataSourceUrl());
dataSource.setUser(databaseProperties.getDataSourceUsername());
dataSource.setPassword(databaseProperties.getDataSourcePassword());
dataSource.setAcquireIncrement(5);
dataSource.setMaxStatementsPerConnection(20);
dataSource.setMaxStatements(100);
dataSource.setMinPoolSize(2);
dataSource.setMaxPoolSize(5);
return dataSource;
}
@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory() throws PropertyVetoException {
HibernateJpaVendorAdapter jpaVendorAdapter = new HibernateJpaVendorAdapter();
jpaVendorAdapter.setDatabasePlatform(databaseProperties.getHibernateDialect());
jpaVendorAdapter.setShowSql(true);
jpaVendorAdapter.setGenerateDdl(false);
Map<String, String> jpaPropertiesMap = new HashMap<String, String>();
jpaPropertiesMap.put("hibernate.dialect", databaseProperties.getHibernateDialect());
jpaPropertiesMap.put("hibernate.show_sql", "true");
jpaPropertiesMap.put("hibernate.format_sql", "true");
jpaPropertiesMap.put("hibernate.hbm2ddl.auto", databaseProperties.getHibernateHbm2ddlAuto());
jpaPropertiesMap.put("hibernate.transaction.factory_class", "org.hibernate.transaction.JDBCTransactionFactory");
jpaPropertiesMap.put("hibernate.ejb.naming_strategy", "org.hibernate.cfg.ImprovedNamingStrategy");
jpaPropertiesMap.put("hibernate.c3p0.min_size", "5");
jpaPropertiesMap.put("hibernate.c3p0.max_size", "20");
jpaPropertiesMap.put("hibernate.c3p0.timeout", "1000");
jpaPropertiesMap.put("c3p0.maxConnectionAge", "7200");
jpaPropertiesMap.put("c3p0.maxIdleTime", "7200");
jpaPropertiesMap.put("c3p0.unreturnedConnectionTimeout", "60");
jpaPropertiesMap.put("c3p0.debugUnreturnedConnectionStackTraces", "true");
jpaPropertiesMap.put("hibernate.c3p0.max_statements", "50");
// Prevent JPA from converting the dates to the UTC time zone
jpaPropertiesMap.put("jadira.usertype.autoRegisterUserTypes", "true");
jpaPropertiesMap.put("jadira.usertype.databaseZone", "jvm");
jpaPropertiesMap.put("jadira.usertype.javaZone", "jvm");
LocalContainerEntityManagerFactoryBean factoryBean = new LocalContainerEntityManagerFactoryBean();
factoryBean.setJpaVendorAdapter(jpaVendorAdapter);
factoryBean.setPackagesToScan("com.nsn.nitro.project.data.jpa.domain");
factoryBean.setJpaPropertyMap(jpaPropertiesMap);
String[] mappingsResources = new String[] {"custom/typedef.hbm.xml"};
factoryBean.setMappingResources(mappingsResources);
factoryBean.setDataSource(dataSource());
return factoryBean;
}
当第二天早上我回到 Web 应用程序并且整晚都没有访问它时，就会发生错误。
我知道 MySQL wait_timeout 是 MySQL 在关闭连接之前等待再次使用连接的秒数。
这意味着我的 Web 应用程序正在尝试使用已过期并在 MySQL 端关闭的连接，而我的 Web 应用程序仍然认为它是一个有效的连接。
我想我应该让我的 Web 应用程序在 MySQL 之前超时连接。这样，Web 应用程序将不会重用任何已在 MySQL 端超时和关闭的连接，因为该连接在 Web 应用程序端已超时。
感觉就像我所有的 c3p0 配置都没有完成它的工作。
我正在使用以下堆栈：
MySQL mysql-5.6.14
mysql-connector-java 5.1.32
Spring 4.1.0.RELEASE
spring-data-jpa 1.6.2.RELEASE
Hibernate 4.3.6.Final
hibernate-jpa-2.1-api 1.0.0.Final
C3P0 0.9.2.1
我的配置有什么问题？
还是我应该明确关闭连接？
这是我设置存储库的方法：
public interface LanguageRepository extends GenericRepository<Language, Long> {
}
@Repository
@Transactional
public class GenericRepositoryImpl<T, ID extends Serializable> extends SimpleJpaRepository<T, ID> implements GenericRepository<T, ID> {
private EntityManager entityManager;
public GenericRepositoryImpl(JpaEntityInformation<T, ID> entityMetadata, EntityManager entityManager) {
super(entityMetadata, entityManager);
this.entityManager = entityManager;
}
public GenericRepositoryImpl(Class<T> domainClass, EntityManager entityManager) {
super(domainClass, entityManager);
this.entityManager = entityManager;
}
public EntityManager getEntityManager() {
return entityManager;
}
@Override
@Transactional
public T deleteById(ID id) throws EntityNotFoundException {
T entity = findOne(id);
if (entity != null) {
delete(entity);
} else {
throw new EntityNotFoundException("The entity could not be found and was not deleted");
}
return entity;
}
}
public class GenericRepositoryFactoryBean<R extends JpaRepository<T, I>, T, I extends Serializable> extends JpaRepositoryFactoryBean<R, T, I> {
protected RepositoryFactorySupport createRepositoryFactory(EntityManager entityManager) {
return new BaseRepositoryFactory<T, I>(entityManager);
}
protected static class BaseRepositoryFactory<T, I extends Serializable> extends JpaRepositoryFactory {
private EntityManager entityManager;
public BaseRepositoryFactory(EntityManager entityManager) {
super(entityManager);
this.entityManager = entityManager;
}
@Override
protected Object getTargetRepository(RepositoryMetadata metadata) {
return new GenericRepositoryImpl<T, I>((JpaEntityInformation<T, I>) getEntityInformation(metadata.getDomainType()), entityManager);
}
@Override
protected Class<?> getRepositoryBaseClass(RepositoryMetadata metadata) {
return GenericRepositoryImpl.class;
}
}
}
@NoRepositoryBean
public interface GenericRepository<T, ID extends Serializable> extends JpaRepository<T, ID> {
public EntityManager getEntityManager();
public T deleteById(ID id) throws EntityNotFoundException;
}
我看不到任何 close() 方法正在实现或在那里调用。我的代码中缺少什么？
编辑：为 C3P0 添加了日志记录。这是输出：
2014-10-17 14:29:00,464 INFO [AbstractPoolBackedDataSource] Initializing c3p0 pool... com.mchange.
v2.c3p0.ComboPooledDataSource [ acquireIncrement -> 5, acquireRetryAttempts -> 30, acquireRetryDelay
-> 1000, autoCommitOnClose -> false, automaticTestTable -> null, breakAfterAcquireFailure -> false,
checkoutTimeout -> 0, connectionCustomizerClassName -> null, connectionTesterClassName -> com.mchan
ge.v2.c3p0.impl.DefaultConnectionTester, dataSourceName -> agvw3s958cggbnis1syx|1acb901, debugUnretu
rnedConnectionStackTraces -> false, description -> null, driverClass -> net.sf.log4jdbc.DriverSpy, f
actoryClassLocation -> null, forceIgnoreUnresolvedTransactions -> false, identityToken -> agvw3s958c
ggbnis1syx|1acb901, idleConnectionTestPeriod -> 0, initialPoolSize -> 3, jdbcUrl -> jdbc:log4jdbc:my
sql://127.0.0.1:3306/nitroproject, maxAdministrativeTaskTime -> 0, maxConnectionAge -> 0, maxIdleTim
e -> 0, maxIdleTimeExcessConnections -> 0, maxPoolSize -> 5, maxStatements -> 100, maxStatementsPerC
onnection -> 20, minPoolSize -> 2, numHelperThreads -> 3, preferredTestQuery -> null, properties ->
{user=******, password=******}, propertyCycle -> 0, statementCacheNumDeferredCloseThreads -> 0, test
ConnectionOnCheckin -> false, testConnectionOnCheckout -> false, unreturnedConnectionTimeout -> 0, u
serOverrides -> {}, usesTraditionalReflectiveProxies -> false ]
2014-10-17 14:29:00,479 DEBUG [BasicResourcePool] incremented pending_acquires: 1
2014-10-17 14:29:00,480 DEBUG [BasicResourcePool] Starting acquisition series. Incremented pending_
acquires [1], attempts_remaining: 30
2014-10-17 14:29:00,480 DEBUG [ThreadPoolAsynchronousRunner] com.mchange.v2.async.ThreadPoolAsynchr
onousRunner@11dbedc: Adding task to queue -- com.mchange.v2.resourcepool.BasicResourcePool$Scattered
AcquireTask@1dd75ae
2014-10-17 14:29:00,481 DEBUG [BasicResourcePool] incremented pending_acquires: 2
2014-10-17 14:29:00,481 DEBUG [BasicResourcePool] Starting acquisition series. Incremented pending_
acquires [2], attempts_remaining: 30
2014-10-17 14:29:00,482 DEBUG [ThreadPoolAsynchronousRunner] com.mchange.v2.async.ThreadPoolAsynchr
onousRunner@11dbedc: Adding task to queue -- com.mchange.v2.resourcepool.BasicResourcePool$Scattered
AcquireTask@15083c7
2014-10-17 14:29:00,482 DEBUG [BasicResourcePool] incremented pending_acquires: 3
2014-10-17 14:29:00,483 DEBUG [BasicResourcePool] Starting acquisition series. Incremented pending_
acquires [3], attempts_remaining: 30
2014-10-17 14:29:00,483 DEBUG [ThreadPoolAsynchronousRunner] com.mchange.v2.async.ThreadPoolAsynchr
onousRunner@11dbedc: Adding task to queue -- com.mchange.v2.resourcepool.BasicResourcePool$Scattered
AcquireTask@fbbf1d
2014-10-17 14:29:00,511 DEBUG [GooGooStatementCache] checkinAll(): com.mchange.v2.c3p0.stmt.DoubleMaxStatementCache stats -- total size: 0; checked out: 0; num connections: 0; num keys: 0
2014-10-17 14:29:00,523 DEBUG [C3P0PooledConnectionPool] com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager@e38aca.acquireResource() returning.
2014-10-17 14:29:00,523 DEBUG [BasicResourcePool] trace com.mchange.v2.resourcepool.BasicResourcePool@ad2e72 [managed: 1, unused: 1, excluded: 0]
2014-10-17 14:29:00,523 DEBUG [BasicResourcePool] decremented pending_acquires: 2
2014-10-17 14:29:00,523 DEBUG [BasicResourcePool] Acquisition series terminated successfully. Decremented pending_acquires [2], attempts_remaining: 30
2014-10-17 14:29:00,521 DEBUG [BasicResourcePool] com.mchange.v2.resourcepool.BasicResourcePool@ad2e72 config: [start -> 3; min -> 2; max -> 5; inc -> 5; num_acq_attempts -> 30; acq_attempt_delay -> 1000; check_idle_resources_delay -> 0; mox_resource_age -> 0; max_idle_time -> 0; excess_max_idle_time -> 0; destroy_unreturned_resc_time -> 0; expiration_enforcement_delay -> 0; break_on_acquisition_failure -> false; debug_store_checkout_exceptions -> false]
2014-10-17 14:29:00,523 DEBUG [C3P0PooledConnectionPoolManager] Created new pool for auth, username (masked): 'ni******'.
2014-10-17 14:29:00,523 DEBUG [BasicResourcePool] trace com.mchange.v2.resourcepool.BasicResourcePool@ad2e72 [managed: 1, unused: 0, excluded: 0] (e.g. com.mchange.v2.c3p0.impl.NewPooledConnection@acde7c)
2014-10-17 14:29:00,524 DEBUG [GooGooStatementCache] checkinAll(): com.mchange.v2.c3p0.stmt.DoubleMaxStatementCache stats -- total size: 0; checked out: 0; num connections: 0; num keys: 0
2014-10-17 14:29:00,525 DEBUG [C3P0PooledConnectionPool] com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager@e38aca.acquireResource() returning.
2014-10-17 14:29:00,525 DEBUG [BasicResourcePool] trace com.mchange.v2.resourcepool.BasicResourcePool@ad2e72 [managed: 2, unused: 1, excluded: 0] (e.g. com.mchange.v2.c3p0.impl.NewPooledConnection@acde7c)
2014-10-17 14:29:00,525 DEBUG [BasicResourcePool] decremented pending_acquires: 1
2014-10-17 14:29:00,529 DEBUG [BasicResourcePool] Acquisition series terminated successfully. Decremented pending_acquires [1], attempts_remaining: 30
2014-10-17 14:29:00,525 DEBUG [GooGooStatementCache] checkinAll(): com.mchange.v2.c3p0.stmt.DoubleMaxStatementCache stats -- total size: 0; checked out: 0; num connections: 0; num keys: 0
2014-10-17 14:29:00,530 DEBUG [C3P0PooledConnectionPool] com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager@e38aca.acquireResource() returning.
2014-10-17 14:29:00,530 DEBUG [BasicResourcePool] trace com.mchange.v2.resourcepool.BasicResourcePool@ad2e72 [managed: 3, unused: 2, excluded: 0] (e.g. com.mchange.v2.c3p0.impl.NewPooledConnection@acde7c)
2014-10-17 14:29:00,530 DEBUG [BasicResourcePool] decremented pending_acquires: 0
2014-10-17 14:29:00,530 DEBUG [BasicResourcePool] Acquisition series terminated successfully. Decremented pending_acquires [0], attempts_remaining: 30
2014-10-17 14:29:00,562 DEBUG [GooGooStatementCache] checkinAll(): com.mchange.v2.c3p0.stmt.DoubleMaxStatementCache stats -- total size: 0; checked out: 0; num connections: 0; num keys: 0
2014-10-17 14:29:00,574 DEBUG [ThreadPoolAsynchronousRunner] com.mchange.v2.async.ThreadPoolAsynchronousRunner@11dbedc: Adding task to queue -- com.mchange.v2.resourcepool.BasicResourcePool$1RefurbishCheckinResourceTask@1fec09e
2014-10-17 14:29:00,574 DEBUG [GooGooStatementCache] checkinAll(): com.mchange.v2.c3p0.stmt.DoubleMaxStatementCache stats -- total size: 0; checked out: 0; num connections: 0; num keys: 0
2014-10-17 14:29:00,575 DEBUG [BasicResourcePool] trace com.mchange.v2.resourcepool.BasicResourcePool@ad2e72 [managed: 3, unused: 2, excluded: 0] (e.g. com.mchange.v2.c3p0.impl.NewPooledConnection@acde7c)
2014-10-17 14:29:00,575 DEBUG [NewProxyConnection] com.mchange.v2.c3p0.impl.NewProxyConnection@39069f: close() called more than once.
2014-10-17 14:29:02,260 DEBUG [BasicResourcePool] trace com.mchange.v2.resourcepool.BasicResourcePool@ad2e72 [managed: 3, unused: 2, excluded: 0] (e.g. com.mchange.v2.c3p0.impl.NewPooledConnection@acde7c)
2014-10-17 14:29:03,111 DEBUG [GooGooStatementCache] checkinAll(): com.mchange.v2.c3p0.stmt.DoubleMaxStatementCache stats -- total size: 0; checked out: 0; num connections: 0; num keys: 0
2014-10-17 14:29:03,112 DEBUG [ThreadPoolAsynchronousRunner] com.mchange.v2.async.ThreadPoolAsynchronousRunner@11dbedc: Adding task to queue -- com.mchange.v2.resourcepool.BasicResourcePool$1RefurbishCheckinResourceTask@146219b
2014-10-17 14:29:03,112 DEBUG [GooGooStatementCache] checkinAll(): com.mchange.v2.c3p0.stmt.DoubleM
axStatementCache stats -- total size: 0; checked out: 0; num connections: 0; num keys: 0
2014-10-17 14:29:03,113 DEBUG [BasicResourcePool] trace com.mchange.v2.resourcepool.BasicResourcePo
ol@ad2e72 [managed: 3, unused: 2, excluded: 0] (e.g. com.mchange.v2.c3p0.impl.NewPooledConnection@acde7c)
2014-10-17 14:29:03,262 DEBUG [DefaultListableBeanFactory] Returning cached instance of singleton bean 'org.springframework.transaction.config.internalTransactionAdvisor'
2014-10-17 14:29:03,285 DEBUG [DefaultListableBeanFactory] Finished creating instance of bean 'entityManagerFactory'
然后它循环输出这个：
2014-10-17 14:34:10,399 DEBUG [ThreadPoolAsynchronousRunner] com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@70b40a -- Running DeadlockDetector[Exiting. No pending tasks.]
2014-10-17 14:34:10,825 DEBUG [ThreadPoolAsynchronousRunner] com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@15e34e2 -- Running DeadlockDetector[Exiting. No pending tasks.]
2014-10-17 14:34:10,825 DEBUG [ThreadPoolAsynchronousRunner] com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@15e34e2 -- Running DeadlockDetector[Exiting. No pending tasks.]
我想这个问题的出现是因为数据库服务器终止了连接，而应用程序连接池仍然有一个句柄。通过在应用程序连接池上设置比在数据库服务器端更短的超时时间，应用程序连接池会在连接被数据库服务器杀死之前更新连接，从而避免该问题。我的 MySQL 数据库服务器的超时等待时间为 28800 秒，而我的应用程序连接池 C3P0 的超时等待时间为 14400 秒。从服务器到客户端的超时等待链必须缩短，这是有道理的。
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