IJ000453 - Unable to get managed connection

刚过完年，正式上班的头一天就碰到个麻烦的问题...

JBoss错误日志：

Caused by: javax.resource.ResourceException: IJ000453: Unable to get managed connection for java:/abc/ds/cba
        at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.getManagedConnection(AbstractConnectionManager.java:390)
        at org.jboss.jca.core.connectionmanager.tx.TxConnectionManagerImpl.getManagedConnection(TxConnectionManagerImpl.java:368)
        at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.allocateConnection(AbstractConnectionManager.java:464)
        at org.jboss.jca.adapters.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:139)
        ... 91 more
Caused by: javax.resource.ResourceException: IJ000655: No managed connections available within configured blocking timeout (30000 [ms])
        at org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreArrayListManagedConnectionPool.getConnection(SemaphoreArrayListManagedConnectionPool.java:383)
        at org.jboss.jca.core.connectionmanager.pool.AbstractPool.getSimpleConnection(AbstractPool.java:397)
        at org.jboss.jca.core.connectionmanager.pool.AbstractPool.getConnection(AbstractPool.java:365)
        at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.getManagedConnection(AbstractConnectionManager.java:329)
        ... 94 more

导致以上错误的是下面这个方法：

    /**
     * 根据HQL查询实体List, 注意是STATELESS的, Hibernate不会维护其状态
     * @param hql
     * @param params
     * @return
     */
    public List getEntityListByHqlStateless(final String hql,final Map params) {
        
        return (List) getHibernateTemplate().execute(new HibernateCallback() {
            
            @Override
            public Object doInHibernate(Session session) throws HibernateException, SQLException {
                StatelessSession statelessSession = session.getSessionFactory().openStatelessSession();
                Query query = statelessSession.createQuery(hql);
                if (params != null) {
                    Iterator> iterator = params.entrySet().iterator();
                    while (iterator.hasNext()) {
                        Entry entry = iterator.next();
                        String key = entry.getKey();
                        Object value = entry.getValue();
                        if(value instanceof Collection) {
                            query.setParameterList(key, (Collection)value);
                        }else {
                            query.setParameter(key, value);
                        }
                    }
                }
                return query.list();
            }
        });
    }

保存业务日志时，需要修改前的业务对象状态，所以使用了StatelessSession来避免Hiberante维护实体对象的状态。

出现IJ000453, IJ000655错误，是由于数据库连接池中的connection被耗尽，无法获取到新的连接导致的。

怀疑是session.getSessionFactory().openStatelessSession()该方法的问题，难道他每次都去取新的数据库连接？而且还没有正常释放？

尝试将该行代码修改成：

StatelessSession statelessSession = session.getSessionFactory().openStatelessSession(session.connection());

使用当前session的数据库连接，测试通过。

---

• Hibernate 3.6.10
• Spring 3.2.8

DAO继承的是HibernateDaoSupport，该方法已不推荐....