[英]SpringMVC + Hibernate + Tomcat leaks memory?
當我關閉我的webApp時。 Tomcat不斷顯示SEVERE警告:
02-Mar-2014 23:07:30.890 SEVERE [http-apr-8080-exec-4] org.apache.catalina.loader.WebappClassLoader.checkThreadLocalMapForLeaks The web application [/movie-collection-0.0.2] created a ThreadLocal with
key of type [com.microsoft.sqlserver.jdbc.ActivityCorrelator$1] (value [com.microsoft.sqlserver.jdbc.ActivityCorrelator$1@520a38a8]) and a value of type [com.microsoft.sqlserver.jdbc.ActivityId] (val
ue [3488cbb4-f0e2-4505-93c4-78248b161847-2]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
02-Mar-2014 23:07:30.891 SEVERE [http-apr-8080-exec-4] org.apache.catalina.loader.WebappClassLoader.checkThreadLocalMapForLeaks The web application [/movie-collection-0.0.2] created a ThreadLocal with
key of type [com.microsoft.sqlserver.jdbc.ActivityCorrelator$1] (value [com.microsoft.sqlserver.jdbc.ActivityCorrelator$1@520a38a8]) and a value of type [com.microsoft.sqlserver.jdbc.ActivityId] (val
ue [ba8aeba9-de9e-49de-8732-5290ae65167b-0]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
02-Mar-2014 23:07:31.848 INFO [http-apr-8080-exec-4] org.apache.catalina.startup.HostConfig.undeploy Undeploying context [/movie-collection-0.0.2]
我清楚地看到描述問題原因的信息。 但經過5個小時的努力,我仍然無法消除它。 這是我的持久性配置:
@Configuration
@EnableTransactionManagement
@PropertySource("classpath:application.properties")
public class PersistenceContext {
private static final String PROPERTY_NAME_DATABASE_DRIVER = "db.driver";
private static final String PROPERTY_NAME_DATABASE_URL = "db.url";
private static final String PROPERTY_NAME_DATABASE_PASSWORD = "db.password";
private static final String PROPERTY_NAME_DATABASE_USERNAME = "db.username";
private static final String PROPERTY_NAME_HIBERNATE_DIALECT = "hibernate.dialect";
private static final String PROPERTY_NAME_HIBERNATE_HBM2DDL_AUTO = "hibernate.hbm2ddl.auto";
private static final String PROPERTY_NAME_HIBERNATE_SHOW_SQL = "hibernate.show_sql";
private static final String PROPERTY_NAME_HIBERNATE_FORMAT_SQL = "hibernate.format_sql";
private static final String PROPERTY_NAME_HIBERNATE_USE_SQL_COMMENT = "hibernate.use_sql_comments";
private static final String PROPERTY_NAME_HIBERNATE_NAMING_STRATEGY = "hibernate.ejb.naming_strategy";
private static final String PROPERTY_NAME_JDBC_BATCH_SIZE = "hibernate.jdbc.batch_size";
private static final String PROPERTY_NAME_CACHE_PROVIDER_CLASS = "hibernate.cache.provider_class";
private static final String PROPERTY_NAME_C3P0_MIN_SIZE = "hibernate.c3p0.min_size";
private static final String PROPERTY_NAME_C3P0_MAX_SIZE = "hibernate.c3p0.max_size";
private static final String PROPERTY_NAME_C3P0_TIMEOUT_SIZE = "hibernate.c3p0.timeout";
private static final String PROPERTY_NAME_C3P0_MAX_STATEMENTS_SIZE = "hibernate.c3p0.max_statements";
private static final String PROPERTY_NAME_C3P0_IDLE_TEST_PERIOD_SIZE = "hibernate.c3p0.idle_test_period";
private static final String PROPERTY_NAME_ENTITYMANAGER_PACKAGES_TO_SCAN = "entitymanager.packages.to.scan";
@Resource
private Environment environment;
@Bean
public DataSource dataSource() {
BasicDataSource dataSource = new BasicDataSource();
dataSource.setDriverClassName(environment.getRequiredProperty(PROPERTY_NAME_DATABASE_DRIVER));
dataSource.setUrl(environment.getRequiredProperty(PROPERTY_NAME_DATABASE_URL));
dataSource.setUsername(environment.getRequiredProperty(PROPERTY_NAME_DATABASE_USERNAME));
dataSource.setPassword(environment.getRequiredProperty(PROPERTY_NAME_DATABASE_PASSWORD));
return dataSource;
}
@Bean
public LocalSessionFactoryBean sessionFactory() {
LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
sessionFactory.setDataSource(dataSource());
sessionFactory.setHibernateProperties(getHibernateProperties());
sessionFactory.setPackagesToScan(environment.getRequiredProperty(PROPERTY_NAME_ENTITYMANAGER_PACKAGES_TO_SCAN));
return sessionFactory;
}
@Bean
public HibernateTransactionManager transactionManager() {
HibernateTransactionManager transactionManager = new HibernateTransactionManager();
transactionManager.setSessionFactory(sessionFactory().getObject());
return transactionManager;
}
private Properties getHibernateProperties() {
Properties props = new Properties();
props.put(PROPERTY_NAME_HIBERNATE_DIALECT, environment.getRequiredProperty(PROPERTY_NAME_HIBERNATE_DIALECT));
props.put(PROPERTY_NAME_HIBERNATE_FORMAT_SQL, environment.getRequiredProperty(PROPERTY_NAME_HIBERNATE_FORMAT_SQL));
props.put(PROPERTY_NAME_HIBERNATE_HBM2DDL_AUTO, environment.getRequiredProperty(PROPERTY_NAME_HIBERNATE_HBM2DDL_AUTO));
props.put(PROPERTY_NAME_HIBERNATE_NAMING_STRATEGY, environment.getRequiredProperty(PROPERTY_NAME_HIBERNATE_NAMING_STRATEGY));
props.put(PROPERTY_NAME_HIBERNATE_SHOW_SQL, environment.getRequiredProperty(PROPERTY_NAME_HIBERNATE_SHOW_SQL));
props.put(PROPERTY_NAME_HIBERNATE_USE_SQL_COMMENT, environment.getRequiredProperty(PROPERTY_NAME_HIBERNATE_USE_SQL_COMMENT));
props.put(PROPERTY_NAME_JDBC_BATCH_SIZE, environment.getRequiredProperty(PROPERTY_NAME_JDBC_BATCH_SIZE));
props.put(PROPERTY_NAME_CACHE_PROVIDER_CLASS, environment.getRequiredProperty(PROPERTY_NAME_CACHE_PROVIDER_CLASS));
props.put(PROPERTY_NAME_C3P0_MIN_SIZE, environment.getRequiredProperty(PROPERTY_NAME_C3P0_MIN_SIZE));
props.put(PROPERTY_NAME_C3P0_MAX_SIZE, environment.getRequiredProperty(PROPERTY_NAME_C3P0_MAX_SIZE));
props.put(PROPERTY_NAME_C3P0_TIMEOUT_SIZE, environment.getRequiredProperty(PROPERTY_NAME_C3P0_TIMEOUT_SIZE));
props.put(PROPERTY_NAME_C3P0_MAX_STATEMENTS_SIZE, environment.getRequiredProperty(PROPERTY_NAME_C3P0_MAX_STATEMENTS_SIZE));
props.put(PROPERTY_NAME_C3P0_IDLE_TEST_PERIOD_SIZE, environment.getRequiredProperty(PROPERTY_NAME_C3P0_IDLE_TEST_PERIOD_SIZE));
return props;
}
}
我的財產:
#Database Configuration
db.driver=com.microsoft.sqlserver.jdbc.SQLServerDriver
db.url=jdbc:sqlserver://localhost;integratedSecurity=true;databaseName=Abc
db.username=""
db.password=""
#Hibernate Configuration
hibernate.dialect=org.hibernate.dialect.SQLServer2012Dialect
hibernate.ejb.naming_strategy=org.hibernate.cfg.ImprovedNamingStrategy
hibernate.cache.provider_class=org.hibernate.cache.internal.NoCachingRegionFactory
hibernate.hbm2ddl.auto=validate
hibernate.jdbc.batch_size=50
#Connection pool config
hibernate.c3p0.min_size=2
hibernate.c3p0.max_size=20
hibernate.c3p0.timeout=300
hibernate.c3p0.max_statements=50
hibernate.c3p0.idle_test_period=3000
#SQL output format
hibernate.format_sql=true
hibernate.show_sql=true
hibernate.use_sql_comments=false
#Declares the base package of the entity classes
entitymanager.packages.to.scan=com.adc.domain
我很感激任何想法。
我添加了ServletContextListener和適當的偵聽器來取消注冊JDBC驅動程序。 仍然沒有結果......我想我必須找到一種方法來清除那些ThreadLocals
public class DbConnectionCleaner implements ServletContextListener {
private static final Logger log = LogManager.getLogger(DbConnectionCleaner.class);
@Override
public void contextInitialized(ServletContextEvent sce) {
log.info("Servlet context initialized");
}
@Override
public void contextDestroyed(ServletContextEvent sce) {
log.info("Cleaning DB connections");
Enumeration<Driver> drivers = DriverManager.getDrivers();
while (drivers.hasMoreElements()) {
Driver driver = drivers.nextElement();
try {
DriverManager.deregisterDriver(driver);
log.info(String.format("Deregistering jdbc driver: %s", driver));
} catch (SQLException ex) {
log.error(String.format("Error deregistering driver %s", driver), ex);
}
}
}
}
如果你的JDBC驅動程序的JAR文件在Tomcat的lib/
目錄中,那么應該沒有泄漏:你不會將WebappClassLoader
固定在內存中。 另請注意,Tomcat通過回收(即銷毀和重新創建)線程池中的所有線程來保護您免受此問題的影響,以刪除綁定到它們的ThreadLocals。
說實話,這是JDBC驅動程序中的一個錯誤:執行終止后,沒有ThreadLocals應該保持綁定到任何線程。 您可能需要與Microsoft核實,看看他們是否有更新來解決此問題。 您還可以檢查是否正在使用某種需要使用ThreadLocal的功能 - 與“活動相關器”有關。 如果禁用該功能,則可以避免該錯誤。
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