小编seb*_*ian的帖子

我有点迷失这个事实:

show status like 'con%';

+-----------------------------------+-------+
| Variable_name                     | Value |
+-----------------------------------+-------+
| Connection_errors_accept          | 0     |
| Connection_errors_internal        | 0     |
| Connection_errors_max_connections | 0     |
| Connection_errors_peer_address    | 0     |
| Connection_errors_select          | 0     |
| Connection_errors_tcpwrap         | 0     |
| Connections                       | 10535 |
+-----------------------------------+-------+

我在这里读了一些类似的问题,但那些不是我的问题,所以我在这里.

我使用MySQL和Hibernate.在我的webapp中,有一个静态的HibernateUtil类来访问数据库:

import org.apache.log4j.Logger;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

public class HibernateUtil {

    private static final Logger log = Logger.getLogger(HibernateUtil.class);        
    private static SessionFactory sessionFactory;    

    static {

        try …

我知道有很多类似的问题.我看了很多,但问题仍然存在.

我有一个已创建但未自动装配的服务.在项目和测试中都没有(!)手动启动(就像在这个问题中一样)

Tomcat输出说,这两个bean都被发现并创建.至少第一项服务不会注入应有的位置.我不知道第二个.

服务(接口):

public interface SchoolService {
  public School getSchool(String id);
}

服务(实施):

@Service
@Transactional
public class SchoolServiceImpl implements SchoolService {

  @Autowired
  private SchoolDAO schoolDAO;

  public School getSchool(String id) {
    //database things
    return school;
  }

}

它被"召唤"的地方

public class SchoolMenu implements Serializable {

  @Autowired
  private SchoolService schoolService;

  public SchoolMenu () {
    //here schoolService is null
    School school = schoolService.getSchool("id");
  }

}

应用程序的context.xml

<?xml version='1.0' encoding='UTF-8' ?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
       http://www.springframework.org/schema/tx …