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我在GlassFish上運行我的應用程序，我使用Spring Security和Hibernate。 當我運行該應用程序時，GlassFish控制檯上將顯示以下警告和錯誤。我怎樣才能避免它們？爲什麼我收到JDBC驅動程序警告和ThreadLocal錯誤？
WARNING: The web application [] registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
SEVERE: The web application [] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [[email protected]]) and a value of type [org.hibernate.internal.SessionImpl] (value [SessionImpl(PersistenceContext[entityKeys=[],collectionKeys=[]];ActionQueue[insertions=[] updates=[] deletions=[] collectionCreations=[] collectionRemovals=[] collectionUpdates=[] unresolvedInsertDependencies=UnresolvedEntityInsertActions[]])]) 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.
SEVERE: The web application [] created a ThreadLocal with key of type [net.sf.json.AbstractJSON$1] (value [[email protected]]) and a value of type [java.util.HashSet] (value [[]]) 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.
SEVERE: The web application [] created a ThreadLocal with key of type [net.sf.json.AbstractJSON$1] (value [[email protected]]) and a value of type [java.util.HashSet] (value [[]]) 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.
的hibernate.cfg.xml
<hibernate-configuration>
<session-factory>
<!-- Database connection settings -->
<property name="connection.driver_class">
com.mysql.jdbc.Driver
</property>
<property name="connection.url">
jdbc:mysql://localhost:3306/myproject
</property>
<property name="connection.username">root</property>
<property name="connection.password"></property>
<!-- JDBC connection pool (use the built-in) -->
<property name="connection.pool_size">12</property>
<!-- SQL dialect -->
<property name="dialect">
org.hibernate.dialect.MySQLDialect
</property>
<!-- Enable Hibernate's automatic session context management -->
<property name="current_session_context_class">thread</property>
<!-- Disable the second-level cache -->
<!-- <property name="cache.provider_class">
org.hibernate.cache.EhCacheProvider
</property>
<property name="hibernate.cache.use_query_cache">true</property>-->
<!-- Echo all executed SQL to stdout -->
<property name="show_sql">true</property>
HibernateUtil.java
public class HibernateUtil {
private static ServiceRegistry serviceRegistry;
private static final ThreadLocal<Session> threadLocal = new ThreadLocal();
private static SessionFactory sessionFactory;
private static SessionFactory configureSessionFactory() {
try {
Configuration configuration = new Configuration();
configuration.configure();
serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();
sessionFactory = configuration.buildSessionFactory(serviceRegistry);
return sessionFactory;
} catch (HibernateException e) {
System.out.append("** Exception in SessionFactory **");
e.printStackTrace();
}
return sessionFactory;
}
static {
try {
sessionFactory = configureSessionFactory();
} catch (Exception e) {
System.err.println("%%%% Error Creating SessionFactory %%%%");
e.printStackTrace();
}
}
private HibernateUtil() {
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
public static Session getSession() throws HibernateException {
Session session = threadLocal.get();
if (session == null || !session.isOpen()) {
if (sessionFactory == null) {
rebuildSessionFactory();
}
session = (sessionFactory != null) ? sessionFactory.openSession() : null;
threadLocal.set(session);
}
return session;
}
public static void rebuildSessionFactory() {
try {
sessionFactory = configureSessionFactory();
} catch (Exception e) {
System.err.println("%%%% Error Creating SessionFactory %%%%");
e.printStackTrace();
}
}
public static void closeSession() throws HibernateException {
Session session = (Session) threadLocal.get();
threadLocal.set(null);
if (session != null) {
session.close();
}
}
}
我從個人的經驗中知道，關於JDBCDriver的一個不值得擔心。基本上，這意味着您在程序結束之前沒有關閉數據庫連接。 – JamesENL
隨着你的配置，Spring註銷驅動程序，請諮詢Spring團隊爲什麼不這樣做。 –
請參閱[this]（http://stackoverflow.com/q/3320400/1391249）問題。 – Tiny