使用 openEntityManagerInView 仍然“无法懒惰地初始化角色集合”

Question

我正在尝试将我的一个实体返回到 JSP 页面，但收到以下错误“无法延迟初始化角色集合”。我添加了 openEntityManagerInView 过滤器（假设它允许实体管理器在视图中保持打开状态？）但仍然出现此错误。

我的应用程序是使用 java config no xml 配置的。

下面是我的调度程序 serverlet。你可以看到我已经添加了 openEntityManagerInView 过滤器。

有什么想法吗？我在 * 上检查了类似的问题，但对所提供的解决方案没有运气。

public class DispatcherServletInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {

@Override
public void onStartup(ServletContext servletContext) throws ServletException {

    registerOpenEntityManagerInViewFilter(servletContext);
    super.onStartup(servletContext);

}

private void registerOpenEntityManagerInViewFilter(ServletContext servletContext) {
    OpenEntityManagerInViewFilter viewFilter = new OpenEntityManagerInViewFilter();
    viewFilter.setEntityManagerFactoryBeanName("entityManagerFactory");
    FilterRegistration.Dynamic registration = servletContext.addFilter("openEntityManagerInView",
            new OpenEntityManagerInViewFilter());
    registration.addMappingForUrlPatterns(null, false, "/*");

}

@Override
protected Class<?>[] getRootConfigClasses() {
    return new Class<?>[]{Config.class, SecurityConfig.class};
}

@Override
protected Class<?>[] getServletConfigClasses() {
    return new Class<?>[]{WebConfig.class};
}

@Override
protected String[] getServletMappings() {
    return new String[]{"/"};
}

}

下面是有问题的实体。我省略了 getter 和 setter。

@Entity
@Table(name = "film")
public class Film {

@Id
@GeneratedValue
@Column(name = "film_id")
private int filmId;
@Column(name = "title")
private String title;
@Column(name = "description")
private String description;
@Column(name = "release_year")
private int releaseYear;
@ManyToOne
@JoinColumn(name = "language_id")
private Language language;
@ManyToOne
@JoinColumn(name = "original_language_id")
private Language originalLanguage;
@Column(name = "rental_duration")
private int rentalDuration;
@Column(name = "rental_rate")
private double rentalRate;
@Column(name = "length")
private int length;
@Column(name = " replacement_cost")
private double replacementCost;
@Column(name = "rating")
private String rating;
@Column(name = "special_features")
private String specialFeatures;
@Temporal(TemporalType.TIMESTAMP)
@Column(name = "last_update")
private Date lastUpdate;
@OneToMany(mappedBy = "film", cascade = CascadeType.ALL)
private List<Inventory> inventories;

.........
}

下面是我的 JPA 配置。

@Configuration
@EnableTransactionManagement
public class Config {

@Bean(name = "entityManagerFactory")
public EntityManagerFactory entityManagerFactory() {
    LocalContainerEntityManagerFactoryBean emf = new LocalContainerEntityManagerFactoryBean();
    HibernateJpaVendorAdapter hibernateJpaVendorAdapter = new HibernateJpaVendorAdapter();
    HibernateJpaDialect hibernateJpaDialect = new HibernateJpaDialect();
    emf.setDataSource(dataSource());
    emf.setPackagesToScan("com");
    emf.setJpaDialect(hibernateJpaDialect);
    emf.setJpaVendorAdapter(hibernateJpaVendorAdapter);
    /* Map<String,String> props = new HashMap<>();
     props.put("hibernate.show_sql", "true");
     emf.setJpaPropertyMap(props);*/
    emf.afterPropertiesSet();
    return emf.getObject();
}

@Bean(name = "transactionManager")
public PlatformTransactionManager transactionManager() throws IOException {
    JpaTransactionManager jtm
            = new JpaTransactionManager();
    jtm.setEntityManagerFactory(entityManagerFactory());
    jtm.setDataSource(dataSource());
    return jtm;
}

@Bean(name = "dataSource")
public DriverManagerDataSource dataSource() {
    DriverManagerDataSource dds = new DriverManagerDataSource();
    dds.setDriverClassName("com.mysql.jdbc.Driver");
    dds.setUrl("jdbc:mysql://localhost/test");
    dds.setUsername("username");
    dds.setPassword("password");
    return dds;
}

}

以下是我的网络配置

@Configuration
@EnableWebMvc
@ComponentScan("com")
public class WebConfig {

@Bean
public ViewResolver viewResolver() {
    InternalResourceViewResolver vr = new InternalResourceViewResolver();
    vr.setViewClass(JstlView.class);
    vr.setPrefix("/WEB-INF/jsp/");
    vr.setSuffix(".jsp");
    vr.setExposeContextBeansAsAttributes(true);
    return vr;
}

}

以下是我的安全配置。

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {

@Autowired
public void configureAuthenticationManagerBuilder(AuthenticationManagerBuilder auth) throws Exception {
    auth
            .inMemoryAuthentication()
            .withUser("user").password("password").roles("USER");
}

@Override
protected void configure(HttpSecurity http) throws Exception {
      http.authorizeRequests()
     .antMatchers("/**").access("hasRole('ROLE_USER')")
     .and().formLogin().loginPage("/login")
     .usernameParameter("username")
     .passwordParameter("password")
     .defaultSuccessUrl("/index", true).failureUrl("/login?error")
     .loginProcessingUrl("/j_spring_security_check");

}

@Override
public void configure(WebSecurity web) throws Exception {
    web.ignoring().antMatchers("/login");
}

}

下面是我的道课。

@Repository
public class FilmDao {

    @PersistenceContext
    private EntityManager em;

    public Film getFilm(int filmId) {
        Film film = em.find(Film.class, filmId);
        return film;
    }

}

下面的服务类由我的控制器调用。

@Service
public class FilmService {

    @Autowired
    private FilmDao filmDao;

   @Transactional
    public Film getFilm(int filmId) {
        Film film = filmDao.getFilm(filmId);
        return film;
    }

}

下面的堆栈跟踪。

14:48:30,416 ERROR [io.undertow.request] (default task-6) UT005023: Exception handling request to /test-app/WEB-INF/jsp/update_inventory.jsp: org.apache.jasper.JasperException: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.jm.sakila.entity.Film.inventories, could not initialize proxy - no Session
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:410) [jastow-1.0.0.Final.jar:1.0.0.Final]
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:326) [jastow-1.0.0.Final.jar:1.0.0.Final]
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:259) [jastow-1.0.0.Final.jar:1.0.0.Final]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) [jboss-servlet-api_3.1_spec-1.0.0.Final.jar:1.0.0.Final]
    at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:82) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:61) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:249) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.ServletInitialHandler.dispatchToPath(ServletInitialHandler.java:192) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.spec.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:160) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:168) [spring-webmvc-4.2.2.RELEASE.jar:4.2.2.RELEASE]
    at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303) [spring-webmvc-4.2.2.RELEASE.jar:4.2.2.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1244) [spring-webmvc-4.2.2.RELEASE.jar:4.2.2.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1027) [spring-webmvc-4.2.2.RELEASE.jar:4.2.2.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:971) [spring-webmvc-4.2.2.RELEASE.jar:4.2.2.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893) [spring-webmvc-4.2.2.RELEASE.jar:4.2.2.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) [spring-webmvc-4.2.2.RELEASE.jar:4.2.2.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872) [spring-webmvc-4.2.2.RELEASE.jar:4.2.2.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:707) [jboss-servlet-api_3.1_spec-1.0.0.Final.jar:1.0.0.Final]
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) [spring-webmvc-4.2.2.RELEASE.jar:4.2.2.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) [jboss-servlet-api_3.1_spec-1.0.0.Final.jar:1.0.0.Final]
    at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:130) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter.doFilterInternal(OpenEntityManagerInViewFilter.java:178) [spring-orm-4.2.2.RELEASE.jar:4.2.2.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.2.2.RELEASE.jar:4.2.2.RELEASE]
    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:132) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) [spring-security-web-3.2.9.RELEASE.jar:3.2.9.RELEASE]
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118) [spring-security-web-3.2.9.RELEASE.jar:3.2.9.RELEASE]
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84) [spring-security-web-3.2.9.RELEASE.jar:3.2.9.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.9.RELEASE.jar:3.2.9.RELEASE]
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113) [spring-security-web-3.2.9.RELEASE.jar:3.2.9.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.9.RELEASE.jar:3.2.9.RELEASE]
    at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103) [spring-security-web-3.2.9.RELEASE.jar:3.2.9.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.9.RELEASE.jar:3.2.9.RELEASE]
    at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113) [spring-security-web-3.2.9.RELEASE.jar:3.2.9.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.9.RELEASE.jar:3.2.9.RELEASE]
    at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:154) [spring-security-web-3.2.9.RELEASE.jar:3.2.9.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.9.RELEASE.jar:3.2.9.RELEASE]
    at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45) [spring-security-web-3.2.9.RELEASE.jar:3.2.9.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.9.RELEASE.jar:3.2.9.RELEASE]
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110) [spring-security-web-3.2.9.RELEASE.jar:3.2.9.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.9.RELEASE.jar:3.2.9.RELEASE]
    at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:57) [spring-security-web-3.2.9.RELEASE.jar:3.2.9.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.2.2.RELEASE.jar:4.2.2.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.9.RELEASE.jar:3.2.9.RELEASE]
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87) [spring-security-web-3.2.9.RELEASE.jar:3.2.9.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.9.RELEASE.jar:3.2.9.RELEASE]
    at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:50) [spring-security-web-3.2.9.RELEASE.jar:3.2.9.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.2.2.RELEASE.jar:4.2.2.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) [spring-security-web-3.2.9.RELEASE.jar:3.2.9.RELEASE]
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192) [spring-security-web-3.2.9.RELEASE.jar:3.2.9.RELEASE]
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160) [spring-security-web-3.2.9.RELEASE.jar:3.2.9.RELEASE]
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346) [spring-web-4.2.2.RELEASE.jar:4.2.2.RELEASE]
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262) [spring-web-4.2.2.RELEASE.jar:4.2.2.RELEASE]
    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:132) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:85) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:61) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:56) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:45) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:63) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:58) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:70) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.security.handlers.SecurityInitialHandler.handleRequest(SecurityInitialHandler.java:76) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
    at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:261) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:247) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:76) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:166) [undertow-servlet-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.server.Connectors.executeRootHandler(Connectors.java:197) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
    at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:759) [undertow-core-1.1.0.Final.jar:1.1.0.Final]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_45]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_45]
    at java.lang.Thread.run(Thread.java:744) [rt.jar:1.7.0_45]
Caused by: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.jm.sakila.entity.Film.inventories, could not initialize proxy - no Session
    at org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:576) [hibernate-core-4.3.11.Final.jar:4.3.11.Final]
    at org.hibernate.collection.internal.AbstractPersistentCollection.withTemporarySessionIfNeeded(AbstractPersistentCollection.java:215) [hibernate-core-4.3.11.Final.jar:4.3.11.Final]
    at org.hibernate.collection.internal.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:555) [hibernate-core-4.3.11.Final.jar:4.3.11.Final]
    at org.hibernate.collection.internal.AbstractPersistentCollection.read(AbstractPersistentCollection.java:143) [hibernate-core-4.3.11.Final.jar:4.3.11.Final]
    at org.hibernate.collection.internal.PersistentBag.iterator(PersistentBag.java:294) [hibernate-core-4.3.11.Final.jar:4.3.11.Final]
    at org.apache.taglibs.standard.tag.common.core.ForEachSupport.toIterator(ForEachSupport.java:72) [jboss-jstl-api_1.2_spec-1.1.2.Final.jar:1.1.2.Final]
    at org.apache.taglibs.standard.tag.common.core.ForEachSupport.prepare(ForEachSupport.java:66) [jboss-jstl-api_1.2_spec-1.1.2.Final.jar:1.1.2.Final]
    at javax.servlet.jsp.jstl.core.LoopTagSupport.doStartTag(LoopTagSupport.java:241) [jboss-jstl-api_1.2_spec-1.1.2.Final.jar:1.1.2.Final]
    at org.apache.jsp.WEB_002dINF.jsp.update_005finventory_jsp._jspx_meth_c_005fforEach_005f1(update_005finventory_jsp.java:231)
    at org.apache.jsp.WEB_002dINF.jsp.update_005finventory_jsp._jspx_meth_c_005fif_005f1(update_005finventory_jsp.java:194)
    at org.apache.jsp.WEB_002dINF.jsp.update_005finventory_jsp._jspService(update_005finventory_jsp.java:83)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:69) [jastow-1.0.0.Final.jar:1.0.0.Final]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) [jboss-servlet-api_3.1_spec-1.0.0.Final.jar:1.0.0.Final]
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:366) [jastow-1.0.0.Final.jar:1.0.0.Final]
    ... 86 more

谢谢。

Answer 1

我遇到了同样的问题。 SecurityFilter 具有默认过滤顺序 -100，这就是原因。您必须在 SecurityFilter （安全过滤器检查用户的角色并失败）之前放置 openEntityManagerInViewFilter （其顺序等于 0 或类似的东西）。尝试使用 order=-101 注册过滤器。您可以将您的方法与 ServletContext 或我使用的以下方法一起使用（只需插入任何标有 @Configuration 注释的 bean）：

@Configuration
public class WebConfig {
@Bean
    public FilterRegistrationBean openEntityManagerInViewFilterRegistration(SecurityProperties properties) {

        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setFilter(openEntityManagerInViewFilter());
        registration.addUrlPatterns("/*");
        registration.setOrder(properties.getFilterOrder()-1);
        registration.setName("openEntityManagerInViewFilter");
        registration.setDispatcherTypes(DispatcherType.REQUEST, DispatcherType.ASYNC);
        return registration;
    }

    @Bean(name = "openEntityManagerInViewFilter")
    public OpenEntityManagerInViewFilter openEntityManagerInViewFilter() {
        return new OpenEntityManagerInViewFilter();
    }
}

主入口点（主类）

@Configuration
@SpringBootApplication
public class Application  extends SpringBootServletInitializer {

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(Application.class);
    }

    static final Logger log = LoggerFactory.getLogger(Application.class);
    public static void main(String[] args) {

        ConfigurableApplicationContext run = SpringApplication.run(Application.class);
        log.info(Arrays.toString(run.getEnvironment().getActiveProfiles()));
    }

}

Answer 2

问题很简单。

在您的 jsp 中，您将返回来自 public Film getFilm(int filmId) 的电影 在 jsp 页面中，您可能会执行以下操作：

<jsp:getProperty name="film" property="inventories" />

您正在尝试获取库存，但它是延迟加载并且会话已经关闭（@Transactional 注释打开会话并在方法完成时关闭）

因此，您要么创建新方法以通过filmId 获取inverntories，要么使其快速加载：

@OneToMany(fetch=FetchType.EAGER, mappedBy = "film", cascade = CascadeType.ALL)
private List<Inventory> inventories;

Answer 3

事务在 JSP 渲染之前完成，因此 Hibernate Session 不再可用于延迟加载所述属性。

替代解决方案（不需要使用 OEMIV 过滤器）：如果您希望在代码中的其他位置保留所述集合属性的延迟加载，请创建一个单独的查找器方法 findFilmWithInventories 用于检索实体并执行join fetch 查询以急切地加载所述集合。

Answer 4

或许，在这种情况下，要简单得多，放弃OpenSessionInView/OpenEntityManagerInView，而使用

<property name="hibernate.enable_lazy_load_no_trans" value="true" />

在 persistence.xml 中（或以编程方式配置）。

此属性具有与 OSIV 类似的行为（以及优缺点），除了可以在每个延迟加载触发器上实例化一个新的 EntityManager，而不是具有一个单独的长范围的，因此您必须注意它以正确管理持久性上下文。

但是，这永远不会因 no Session 而失败。

Answer 5

您可以简单地在您的@Transactional 服务层内的某处调用film.getInventories()。这为您提供了更多控制权，而不是在 JPA 级别上急切加载：

@Service
public class FilmService {

   @Autowired
   private FilmDao filmDao;

   @Transactional
    public Film getFilm(int filmId, boolean loadInventories) {
        Film film = filmDao.getFilm(filmId);
        if(loadInventories){ film.getInventories(); }
        return film;
    }
}

由于它需要另一个往返 DB，我建议添加一些缓存。

您还可以像这样添加通用字段加载功能：

   @Transactional
    public Film getFilm(int filmId, String[] propertiesToLoad) {
        Film film = filmDao.getFilm(filmId);
        BeanWrapper bw = new BeanWrapperImpl(item);
        for (String propertyName : propertiesToLoad) {
           bw.getPropertyValue(propertyName);
        }
        return film;
    }