在几个选择查询或插入查询后休眠挂起
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【中文标题】在几个选择查询或插入查询后休眠挂起【英文标题】:Hibernate hangs after several select queries or insert queries 【发布时间】:2016-08-09 12:39:31 【问题描述】:我正在使用 Hibernate 关系开发 Spring 和 Hibernate Web 应用程序,它可以正常工作 3 次,并且从数据库中获取记录没有问题,但是在 4 次应用程序挂起或冻结时,当我重新启动 tomcat 服务器时,一切正常很好,尝试 4 次后再次挂起或冻结。当应用程序挂起或冻结让我很困惑时,没有错误。当我测试另一个在 Hibernate 上不使用关系运行良好的类时,我怀疑是关系,但我不知道~
这是我的 Hibernate 关系参考 ~
mkyong
viralpatel
这是我的任务,
这是我的用户类,
@SuppressWarnings("serial")
@Entity
@Table(name="user")
public class User implements Serializable
private String no_dana;
private String npp;
@Id
@Column(name="no_dana", unique=true, nullable=false, updatable=false)
public String getNo_dana()
return no_dana;
public void setNo_dana(String no_dana)
this.no_dana = no_dana;
@Column(name="npp")
public String getNpp()
return npp;
private Set<Tanya> tanya;
@OneToMany(fetch= FetchType.LAZY, cascade=CascadeType.ALL, mappedBy="user")
public Set<Tanya> getTanya()
return tanya;
public void setTanya(Set<Tanya> tanya)
this.tanya = tanya;
private Set<Jawab> jawab;
@OneToMany(fetch = FetchType.LAZY, mappedBy="user")
public Set<Jawab> getJawab()
return jawab;
public void setJawab(Set<Jawab> jawab)
this.jawab = jawab;
这是我的 tanya 课,
@SuppressWarnings("serial")
@Entity
@Table(name="tanya")
public class Tanya implements Serializable
private int id_tanya;
private String isi;
@Id
@Column(name="id_tanya", unique=true, nullable=false)
public int getId_tanya()
return id_tanya;
public void setId_tanya(int id_tanya)
this.id_tanya = id_tanya;
@Column(name="isi")
public String getIsi()
return isi;
public void setIsi(String isi)
this.isi = isi;
private User user;
@ManyToOne(cascade=CascadeType.ALL)
@JoinColumn(name="no_dana")
public User getUser()
return user;
public void setUser(User user)
this.user = user;
private Set<Jawab> jawab;
@OneToMany(fetch = FetchType.LAZY, mappedBy="tanya")
public Set<Jawab> getJawab()
return jawab;
public void setJawab(Set<Jawab> jawab)
this.jawab = jawab;
这是我的下巴班,
@SuppressWarnings("serial")
@Entity
@Table(name="jawab")
public class Jawab implements Serializable
private int id_jawab;
private String isi;
@Id
@Column(name="id_jawab", unique=true, nullable=false)
public int getId_jawab()
return id_jawab;
public void setId_jawab(int id_jawab)
this.id_jawab = id_jawab;
@Column(name="isi")
public String getIsi()
return isi;
public void setIsi(String isi)
this.isi = isi;
private User user;
@ManyToOne(cascade=CascadeType.ALL)
@JoinColumn(name="no_dana")
public User getUser()
return user;
public void setUser(User user)
this.user = user;
private Tanya tanya;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name="id_tanya")
public Tanya getTanya()
return tanya;
public void setTanya(Tanya tanya)
this.tanya = tanya;
这是我的 dao 示例(来自 tanya 类),
@Autowired
private TanyaDaoImpl(SessionFactory sessionFactory)
setSessionFactory(sessionFactory);
@SuppressWarnings("unchecked")
@Override
public Tanya get(int id_tanya)throws Exception
DetachedCriteria criteria = DetachedCriteria.forClass(Tanya.class).add(Restrictions.eq("id_tanya", id_tanya));
List<Tanya> tanyaList = getHibernateTemplate().findByCriteria(criteria);
return tanyaList.get(0);
@Override
public Tanya getTanya(int id_tanya)throws Exception
Query query = getSession().createQuery("from Tanya where id_tanya = :id_tanya");
query.setParameter("id_tanya", id_tanya);
return (Tanya) query.list().get(0);
@Override
public void save(Tanya tanya)throws Exception
getHibernateTemplate().save(tanya);
@Override
public void update(Tanya tanya)throws Exception
getHibernateTemplate().update(tanya);
@Override
public void delete(Tanya tanya)throws Exception
getHibernateTemplate().delete(tanya);
@SuppressWarnings("unchecked")
@Override
public List<Tanya> listAllTanya()throws Exception
DetachedCriteria criteria = DetachedCriteria.forClass(Tanya.class);
List<Tanya> tanyaList = getHibernateTemplate().findByCriteria(criteria);
return tanyaList;
这是我的会话配置,
<context:component-scan base-package="org.ppbni.splatter" />
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/db_ppbni" />
<property name="username" value="root" />
<property name="password" value="shikamaru" />
<!-- <property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/ppbniorg_db" />
<property name="username" value="ppbniorg_user" />
<property name="password" value="shikamaru" /> -->
</bean>
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="configurationClass" value="org.hibernate.cfg.AnnotationConfiguration"></property>
<property name="dataSource" ref="dataSource"></property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
<prop key="hibernate.show_sql">true</prop>
</props>
</property>
<property name="packagesToScan" value="org.ppbni.splatter.model" />
</bean>
<bean id="transactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager"
p:sessionFactory-ref="sessionFactory">
</bean>
任何帮助都会很高兴 :D ~
【问题讨论】:
能否也补充一下如何指定dataSource bean? @alobodzk 我已经更新了我的问题,请查看~ 【参考方案1】:这可能是因为以前的会话。在成功的事务后使用 session.close() 方法关闭会话,这将释放连接到数据库的实例。由于这种方法,问题得到了纠正。
session.close();
https://docs.jboss.org/hibernate/orm/3.5/javadocs/org/hibernate/Session.html#close()
【讨论】:
【参考方案2】:我不知道什么会导致间歇性问题,但有一些事情可以使用更正,也许这些更改会纠正行为。
几点:
我的感觉是你应该把@Id
列
Long
或 Integer
并保持一致。
您的 impl 有一些令人困惑的结构。为什么需要get()
和getTanya()
?
在下面的示例中,我注释的是字段,而不是 getter。这似乎是 Spring 的偏好,尽管有 varying opinions。
根据您提供的代码,我无法判断您是否包含@Transactional
。无论如何,您都可以这样标记readOnly
。
(旁白)如果不添加任何细节,则无需指定 FetchType.LAZY
或 @Column
之类的默认值。只包含最基本的代码,这样下一个人就更容易阅读了。
除此之外,您还可以dump a stack trace 并查看线程挂在哪里。
通用 CRUD 接口:
public interface GenericDao<T>
T find(Long id);
List<T> findAll();
T update(T t);
T save(T t);
void delete(Long id);
谭雅道:
public interface TanyaDao extends GenericDao<Tanya>
//add any specific Tanya code
TanyaDAOImpl:
@Repository
@Transactional
public class TanyaDaoImpl implements TanyaDao
@Override
@Transactional(readOnly = true, timeout = 10)
public Tanya find(Integer id)
return (Tanya) getCurrentSession().get(Tanya.class, id);
@Override
@Transactional(readOnly = true, timeout = 10)
public List<Tanya> findAll()
Criteria criteria = getCurrentSession().createCriteria(Tanya.class); // this may be different depending on your version of Hibernate
@SuppressWarnings("unchecked")
List<Tanya> tanyas = criteria.list();
return tanyas;
@Override
public Tanya update(Tanya tanya)
try
getCurrentSession().update(tanya);
catch (NonUniqueObjectException ignored)
tanya = (Tanya) getCurrentSession().merge(tanya); //you may or may not need to do this part
return tanya;
@Override
public Tanya save(Tanya tanya)
Serializable id = getCurrentSession().save(tanya);
return (Tanya) getCurrentSession().get(Tanya.class, id);
@Override
public void delete(Integer id)
Tanya tanya = find(id.intValue());
getCurrentSession().delete(tanya);
@Autowired
private SessionFactory sessionFactory;
private Session getCurrentSession()
return sessionFactory.getCurrentSession();
用户:
@Entity
@Table(name = "user")
public class User implements Serializable
@Id
@Column(name = "no_dana")
@GeneratedValue
private Long id;
@OneToMany(cascade = CascadeType.ALL, mappedBy = "user")
private Set<Tanya> tanya;
@OneToMany(mappedBy = "user")
private Set<Jawab> jawab;
public Long getId()
return id;
public void setId(Long id)
this.id = id;
public Set<Tanya> getTanya()
return tanya;
public void setTanya(Set<Tanya> tanya)
this.tanya = tanya;
public Set<Jawab> getJawab()
return jawab;
public void setJawab(Set<Jawab> jawab)
this.jawab = jawab;
贾瓦布:
@Entity
@Table(name = "jawab")
public class Jawab implements Serializable
@Id
@GeneratedValue
@Column(name = "id_jawab")
private Long id;
private String isi;
@ManyToOne(cascade = CascadeType.ALL)
@JoinColumn(name = "no_dana")
private User user;
@ManyToOne
@JoinColumn(name = "id_tanya")
private Tanya tanya;
public Long getId()
return id;
public void setId(Long id)
this.id = id;
public String getIsi()
return isi;
public void setIsi(String isi)
this.isi = isi;
public User getUser()
return user;
public void setUser(User user)
this.user = user;
public Tanya getTanya()
return tanya;
public void setTanya(Tanya tanya)
this.tanya = tanya;
谭雅:
@Entity
@Table(name = "tanya")
public class Tanya implements Serializable
@Id
@GeneratedValue
@Column(name = "id_tanya")
private Long id;
private String isi;
@ManyToOne(cascade = CascadeType.ALL)
@JoinColumn(name = "no_dana")
private User user;
@OneToMany(mappedBy = "tanya")
private Set<Jawab> jawab;
public Long getId()
return id;
public void setId(Long id)
this.id = id;
public String getIsi()
return isi;
public void setIsi(String isi)
this.isi = isi;
public User getUser()
return user;
public void setUser(User user)
this.user = user;
public Set<Jawab> getJawab()
return jawab;
public void setJawab(Set<Jawab> jawab)
this.jawab = jawab;
【讨论】:
我已经删除了所有的关系,但在输入搜索时仍然遇到同样的问题,真的不知道 :DD ~以上是关于在几个选择查询或插入查询后休眠挂起的主要内容,如果未能解决你的问题,请参考以下文章