LazyInitializationException，活動的事務和連接打開

Question

我知道這已被問了很多次（已經在這裏和其他網站大多數帖子cheched），但我沒有得到解決我的問題。

我的設置是：JPA 2 + hibernate的4個+彈簧4 + primefaces +的JBoss EAP 7

的問題：我有一個延遲集合到另一個bean，但是當我打電話給.size（）方法在bean上，它拋出「LazyInitializationException：無法懶惰地初始化一個角色集合：com.pe.controlLines.data.model.Activity.activityRisks，無法初始化代理 - 沒有會話」

我確定我有一個在這個LazyInitializationException Within a @Transactional Method和http://blog.timmattison.com/archives/2012/04/19/tips-for-debugging-springs-transactional-annotation/之後的活動交易，所以我100％確定當時正在運行的交易。

我的實體clases：

@Entity 
public class Company { 

    @Id 
    @GeneratedValue(strategy=GenerationType.AUTO) 
    private long companyId; 

    @Column 
    private String name; 

    @OneToOne(cascade={CascadeType.PERSIST, CascadeType.REFRESH, CascadeType.MERGE}) 
    private Activity companieActivities; 

    @OneToMany 
    private Collection<SourceSupervision> sourceSupervisions; 

和嵌套類

@Entity 
@Indexed 
public class Activity { 

    @Id 
    @GeneratedValue(strategy=GenerationType.AUTO) 
    private long activityId; 

    @ManyToOne 
    @JoinColumn(name="parentActivityId") 
    private Activity parent; 

    @Column 
    @Field(index = Index.YES, analyze = Analyze.YES, store = Store.NO) 
    @Analyzer(definition = "searchtokenanalyzer") 
    private String name; 

    @Column 
    @Field(index = Index.YES, analyze = Analyze.YES, store = Store.NO) 
    @Analyzer(definition = "searchtokenanalyzer") 
    private String description; 

    @OneToMany(cascade={CascadeType.PERSIST, CascadeType.REFRESH}) 
    private Collection<ActivityRisk> activityRisks = new ArrayList<ActivityRisk>(); 

    @ManyToMany(cascade={CascadeType.PERSIST, CascadeType.REFRESH}) 
    private Collection<Word> words; 

    @ManyToMany 
    private Collection<Rol> rolesForActivity; 

的bussines委託anotated像這樣（的bussines從頁面控制器調用）：

@Component 
@Scope("session") 
@Transactional 
public class SystemConfigurationBussinesDelegate { 

獲得對該實體的引用的官方化，該實體運行良好。 （這是從aboce類）

private Company currentCompany; 

    private Risk currentRisk; 

    @PostConstruct 
    public void init(){ 
     //((WordDAO)wordDAO).startIndexer(); 
     currentCompany = genericDAO.get(Company.class, 1l); 
    } 

但在此方法，以便該交易活躍

public List<Danger> getDangers(){ 

     List<Danger> returnValue = new ArrayList<Danger>(); 
     System.out.println(TransactionSynchronizationManager.isActualTransactionActive()); 
     Hibernate.initialize(currentCompany.getCompanieActivities()); 
     currentCompany.getCompanieActivities().getActivityRisks().size(); 
     for(ActivityRisk aRisk : currentCompany.getCompanieActivities().getActivityRisks()){ 
      Risk risk = aRisk.getRisk(); 
      if(risk == currentRisk){ 
       returnValue = new ArrayList<Danger>(aRisk.getDangers()); 
      } 
     } 
     return returnValue; 
    } 

的系統輸出返回true，我可以看到一個打開的連接到數據庫，Hibernate的。 inicialize正常工作，並調用currentCompany.getCompanieActivities（）。getActivityRisks（）。size（）;拋出異常。

它可能是上下文或somethng類似的問題嗎？

我的Spring配置：

<?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:context="http://www.springframework.org/schema/context" 
    xmlns:security="http://www.springframework.org/schema/security" 
    xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:util="http://www.springframework.org/schema/util" 
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" 
    xmlns:jee="http://www.springframework.org/schema/jee" 
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
         http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
         http://www.springframework.org/schema/context 
         http://www.springframework.org/schema/context/spring-context-3.0.xsd 
         http://www.springframework.org/schema/tx 
         http://www.springframework.org/schema/tx/spring-tx-3.0.xsd 
         http://www.springframework.org/schema/aop 
         http://www.springframework.org/schema/aop/spring-aop-2.5.xsd 
         http://www.springframework.org/schema/util 
         http://www.springframework.org/schema/util/spring-util-2.5.xsd 
         http://www.springframework.org/schema/jdbc 
         http://www.springframework.org/schema/jdbc/spring-jdbc.xsd 
         http://www.springframework.org/schema/jee 
         http://www.springframework.org/schema/jee/spring-jee.xsd"> 

    <context:component-scan base-package="com.pe.controlLines" /> 

    <context:annotation-config /> 
    <context:spring-configured /> 

    <aop:aspectj-autoproxy proxy-target-class="true"/> 

    <jee:jndi-lookup id="myDataSource" jndi-name="java:/ControllinesDS"/> 
    <!-- Data Source Declaration --> 
    <!-- Session Factory Declaration <bean id="SessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"> --> 
    <!-- Session Factory Declaration --> 
    <bean id="SessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"> 
     <property name="dataSource" ref="myDataSource" /> 
     <!-- <property name="packagesToScan"> 
      <list> 
       <value>net.javabeat.spring.model</value> 
      </list> 
     </property> 
     <property name="annotatedClasses"> 
      <list> 
       <value>co.com.testTalos.model.Storage</value> 
       <value>co.com.testTalos.model.Buyer</value> 
       <value>co.com.testTalos.model.Preferences</value> 
      </list> 
     </property>--> 
     <property name="packagesToScan"> 
      <list> 
       <value>com.pe.controlLines.data.model</value> 
      </list> 
     </property> 
     <property name="hibernateProperties"> 
      <props> 
       <prop key="hibernate.hbm2ddl.auto">update</prop> 
       <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop> 
       <prop key="hibernate.show_sql">true</prop> 
       <prop key="hibernate.search.default.directory_provider">filesystem</prop> 
       <prop key="hibernate.search.default.indexBase">C:/DEVELOPMENT/lucene/indexes</prop> 


      </props> 
     </property> 
    </bean> 

    <!-- Enable the configuration of transactional behavior based on annotations --> 
    <tx:annotation-driven transaction-manager="txManager"/> 

    <!-- Transaction Manager is defined --> 
    <bean id="txManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager"> 
     <property name="sessionFactory" ref="SessionFactory"/> 
    </bean> 

</beans> 

Answer 1

我覺得你的問題是與調用內部@PostConstruct事務的方法來做。通過設計，spring tx方面在postconstruct方法上/可能不會激活，因爲並不是所有bean都能保證完成構建。嘗試搜索這個主題，我記得也遇到過這個驚喜，但有很多有用的文章。

從那時起，我需要關於postconstruct的tx的首選替代方案是使用ContextRefreshedEvent的 使用編程事務（請參閱Spring TransactionTemplate模式） 。看下面的例子：

@Service 
public class MyService implements ApplicationListener<ContextRefreshedEvent> { 

    public void onApplicationEvent(ContextRefreshedEvent event) { 
    // This method will be executed at context startup or refresh 
    // It is guaranteed all beans have finish constructing, hence 
    // AOP tx is available 
    } 
    ... 
}