jpa - 随机找到 CDI 托管 bean

Question

我有一个分成 3 个模块的耳朵项目：

• 一个网络模块，
• 一个包含我的实体的 jar 模块，
• 一个ejb模块。

我有一个看起来像这样的类：

public class UserServiceProviderEnterpriseImpl implements UserServiceProvider {
  @Override
  public UserService getUserService() {
    final BeanManager beanManager = CDI.current().getBeanManager();
    Bean<?> bean = beanManager.getBeans("userService").iterator().next();
    final CreationalContext<?> creationalContext = beanManager.createCreationalContext(bean);
    return (UserService) beanManager.getReference(bean, bean.getBeanClass(), creationalContext);
  }
}

该类属于实体模块。

该类的一个实例是在我的@Entity 对象的@MappedSuperclass 中的@PreUpdate 挂钩中创建的。这个类（和所说的钩子）看起来像这样：

@MappedSuperclass
@Access(AccessType.FIELD)
public abstract class BusinessObject<T extends Serializable> implements Cloneable {

  // [...]

  @PrePersist
  @PreUpdate
  @SuppressWarnings("unchecked")
  private void _prePersist() {

    // [...]

    final User currentUser = getUserServiceProvider().getUserService().getCurrentUser();

    // [...]
  }

  private static UserServiceProvider getUserServiceProvider() {
    try {
      return SenyuProperties.Core.getUserServiceProviderClass().newInstance();
    } catch (InstantiationException | IllegalAccessException e) {
      throw new RuntimeException("Erreur lors de l'instanciation du UserServiceProvider", e);
    }
  }

  // [...]
}

扩展此实体类的实体类与 UserServiceProviderEnterpriseImpl 类位于同一模块中。

我的问题出现在这一行：

Bean<?> bean = beanManager.getBeans("userService").iterator().next();

...有时会抛出 NoSuchElementException （由 BeanManager#getBeans 方法返回的空 Set 的原因），但有时不会。这个问题似乎是部署范围的，因为我可以部署我的耳朵，这将在每次调用 getUserService() 方法时发生，但在重新部署后，相同的场景可以完全正常工作（BeanManager#getBeans 方法不返回一个空的集合了）。

所以我的问题是：为什么这段代码的行为方式是这样的？难道我做错了什么？这种随机性的来源是什么？

如果这有帮助，我的托管 bean 看起来像这样（它属于 web 模块）：

@Named("userService")
@SessionScoped
public class UserServiceEnterpriseImpl implements UserService, Serializable {
  @EJB
  private UserDAO dao;
  private User user;

  @Override
  public User getCurrentUser() {
    return user;
  }

  @PostConstruct
  private void initCurrentUser() {
    user = dao.findByUsername((String)SecurityUtils.getSubject().getPrincipal());
  }
}

我正在使用 Payara 4.1.1.162。

更新

我已经尝试过但没有用的东西：

• 使用 application.xml 中的 initialize-in-order 标记（设置为 true）并更改模块的顺序，
• 将 Payara 更新到可用的最新版本 (4.1.1.163)，
• 通过命令行手动部署应用程序（我通常从 IntelliJ 执行此操作），
• 删除 BusinessObject#getUserServiceProvider() 方法中的“静态”关键字，
• 在我更改 getUserService() 方法代码以使用此答案https://stackoverflow.com/a/40328987/7090063提供的解决方案之后，所有这一切。

根据要求，这是我唯一的 beans.xml，它位于我的 src/main/webapp/WEB-INF 目录中的 web 模块中：

<beans xmlns="http://xmlns.jcp.org/xml/ns/javaee"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/beans_1_1.xsd"
       version="1.1" bean-discovery-mode="all">
  <interceptors>
    <class>org.senyu.intranet.managedbean.ShiroSecuredInterceptor</class>
  </interceptors>
</beans>

这是我到目前为止提到的类的耳朵结构的总结：

ear
+-ejb (jar)
+-entity (jar)
| +-src
|   +-main
|     +-java
|       +-org
|         +-senyu
|           +-intranet
|             +-entity
|               +-user
|               | +-UserServiceProviderEnterpriseImpl
|               +-contrat
|                 +-Contrat // the class extending BusinessObject.
|                           // The latter reside in a dependency
|                           // (core-common-1.0.0-SNAPSHOT.jar).
|                           // The full list is right beneath.
|                           // The UserService and UserServiceProvider
|                           // interfaces also come from this jar.
+-web
  +-src
    +-main
    | +-java
    |   +-org
    |     +-senyu
    |       +-intranet
    |         +-managedbean
    |           +-UserServiceEnterpriseImpl
    |           +-ShiroSecuredInterceptor // @Interceptor class with an @AroundInvoke annotated method
    +-webapp
      +-WEB-INF
        +-beans.xml

这些是打包在我的war文件的WEB-INF/lib目录中的jar：

antlr-2.7.7.jar
aopalliance-repackaged-2.5.0-b05.jar
bootstrap-3.3.7-1.jar
cdi-api-1.1.jar
classmate-1.3.0.jar
commons-beanutils-1.8.3.jar
commons-codec-1.10.jar
commons-lang3-3.4.jar
commons-logging-1.2.jar
core-common-1.0.0-SNAPSHOT.jar // I developed this...
core-enterprise-1.0.0-SNAPSHOT.jar // ...and that too.
dom4j-1.6.1.jar
el-api-2.2.jar
geronimo-jta_1.1_spec-1.1.1.jar
gson-2.7.jar
hibernate-commons-annotations-5.0.1.Final.jar
hibernate-core-5.2.3.Final.jar
hibernate-jpa-2.1-api-1.0.0.Final.jar
hk2-api-2.5.0-b05.jar
hk2-locator-2.5.0-b05.jar
hk2-utils-2.5.0-b05.jar
jackson-annotations-2.8.0.jar
jackson-core-2.8.3.jar
jackson-databind-2.8.3.jar
jandex-2.0.0.Final.jar
javassist-3.20.0-GA.jar
javax.annotation-api-1.2.jar
javax.inject-1.jar
javax.inject-2.5.0-b05.jar
javax.ws.rs-api-2.0.1.jar
jboss-interceptors-api_1.1_spec-1.0.0.Beta1.jar
jboss-logging-3.3.0.Final.jar
jersey-client-2.23.2.jar
jersey-common-2.23.2.jar
jersey-guava-2.23.2.jar
jersey-media-jaxb-2.23.2.jar
jersey-mvc-2.23.2.jar
jersey-server-2.23.2.jar
jquery-1.12.4.jar
jsr250-api-1.0.jar
log4j-api-2.6.2.jar
log4j-core-2.6.2.jar
osgi-resource-locator-1.0.1.jar
primefaces-6.0.jar
servlet-api-2.4.jar
shiro-core-1.3.0.jar
shiro-web-1.3.0.jar
slf4j-api-1.6.4.jar
validation-api-1.1.0.Final.jar

更新 2

我在 Payara 中为 org.weld.jboss 创建了一个记录器。这是我在工作时得到的：

Sending PAT using the default event resolver: [BackedAnnotatedType] public @Named @SessionScoped class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl]]
WELD-001536: Found [] constructors annotated with @Inject for [EnhancedAnnotatedTypeImpl] public @SessionScoped @Named class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl]]
WELD-000002: Exactly one constructor ([EnhancedAnnotatedConstructorImpl] public org.senyu.intranet.managedbean.UserServiceEnterpriseImpl()) defined, using it as the bean constructor for [EnhancedAnnotatedTypeImpl] public @SessionScoped @Named class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl]]
WELD-000004: Exactly one post construct method ([EnhancedAnnotatedMethodImpl] @PostConstruct private org.senyu.intranet.managedbean.UserServiceEnterpriseImpl.initCurrentUser()) for [EnhancedAnnotatedTypeImpl] public @SessionScoped @Named class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl]]
WELD-001536: Found [] constructors annotated with @Inject for [EnhancedAnnotatedTypeImpl] public @SessionScoped @Named class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl]]
WELD-000002: Exactly one constructor ([EnhancedAnnotatedConstructorImpl] public org.senyu.intranet.managedbean.UserServiceEnterpriseImpl()) defined, using it as the bean constructor for [EnhancedAnnotatedTypeImpl] public @SessionScoped @Named class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl]]
WELD-000012: Building bean metadata for class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl]]
WELD-000010: Using qualifiers [@javax.enterprise.inject.Default(), @javax.inject.Named(value=userService), @javax.enterprise.inject.Any()] for Managed Bean [class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl] with qualifiers [@Default @Named @Any]]]
WELD-000014: Using name userService for Managed Bean [class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl] with qualifiers [@Default @Named @Any]]]
WELD-000016: Using scope interface javax.enterprise.context.SessionScoped for Managed Bean [class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl] with qualifiers [@Default @Named @Any]]]
WELD-000106: Bean: Managed Bean [class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl] with qualifiers [@Default @Named @Any]]]
WELD-001538: Created context instance for bean Managed Bean [class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl] with qualifiers [@Default @Named @Any] identified as WELD%ManagedBean%intranet-ear|intranet-web-1.0.0-SNAPSHOT.war|org.senyu.intranet.managedbean.UserServiceEnterpriseImpl|null|false]]
WELD-001542: Retrieving/generating proxy class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl$Proxy$_$$_WeldClientProxy]]
WELD-001541: Adding method to proxy: public org.senyu.core.common.user.User org.senyu.intranet.managedbean.UserServiceEnterpriseImpl.getCurrentUser()]]
WELD-001541: Adding method to proxy: private void org.senyu.intranet.managedbean.UserServiceEnterpriseImpl.initCurrentUser()]]
WELD-001543: Created Proxy class of type class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl$Proxy$_$$_WeldClientProxy supporting interfaces [interface org.senyu.core.common.user.UserService, interface java.io.Serializable, interface org.jboss.weld.interceptor.proxy.LifecycleMixin, interface org.jboss.weld.interceptor.util.proxy.TargetInstanceProxy, interface org.jboss.weld.bean.proxy.ProxyObject]]]
WELD-001506: Created new client proxy of type class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl$Proxy$_$$_WeldClientProxy for bean Managed Bean [class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl] with qualifiers [@Default @Named @Any] with ID WELD%ManagedBean%intranet-ear|intranet-web-1.0.0-SNAPSHOT.war|org.senyu.intranet.managedbean.UserServiceEnterpriseImpl|null|false]]
WELD-001507: Located client proxy of type class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl$Proxy$_$$_WeldClientProxy for bean Managed Bean [class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl] with qualifiers [@Default @Named @Any]]]
WELD-000200: Looked for WELD%ManagedBean%intranet-ear|intranet-web-1.0.0-SNAPSHOT.war|org.senyu.intranet.managedbean.UserServiceEnterpriseImpl|null|false and got null in org.jboss.weld.context.beanstore.http.LazySessionBeanStore@3feb0ef2]]
WELD-000200: Looked for WELD%ManagedBean%intranet-ear|intranet-web-1.0.0-SNAPSHOT.war|org.senyu.intranet.managedbean.UserServiceEnterpriseImpl|null|false and got null in org.jboss.weld.context.beanstore.http.LazySessionBeanStore@3feb0ef2]]
WELD-000200: Looked for WELD%ManagedBean%intranet-ear|intranet-web-1.0.0-SNAPSHOT.war|org.senyu.intranet.managedbean.UserServiceEnterpriseImpl|null|false and got null in org.jboss.weld.context.beanstore.http.LazySessionBeanStore@3feb0ef2]]
WELD-000200: Looked for WELD%ManagedBean%intranet-ear|intranet-web-1.0.0-SNAPSHOT.war|org.senyu.intranet.managedbean.UserServiceEnterpriseImpl|null|false and got null in org.jboss.weld.context.beanstore.http.LazySessionBeanStore@3feb0ef2]]
WELD-000220: Added WELD_S#WELD%ManagedBean%intranet-ear|intranet-web-1.0.0-SNAPSHOT.war|org.senyu.intranet.managedbean.UserServiceEnterpriseImpl|null|false to session 0fcfe5dc9c8fb5d583f9b90ce7ae]]
WELD-000202: Added ForwardingBean userService for Managed Bean [class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl] with qualifiers [@Default @Named @Any] with key WELD%ManagedBean%intranet-ear|intranet-web-1.0.0-SNAPSHOT.war|org.senyu.intranet.managedbean.UserServiceEnterpriseImpl|null|false to org.jboss.weld.context.beanstore.http.LazySessionBeanStore@3feb0ef2]]

当它没有时：

Sending PAT using the default event resolver: [BackedAnnotatedType] public @Named @SessionScoped class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl]]
WELD-001536: Found [] constructors annotated with @Inject for [EnhancedAnnotatedTypeImpl] public @SessionScoped @Named class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl]]
WELD-000002: Exactly one constructor ([EnhancedAnnotatedConstructorImpl] public org.senyu.intranet.managedbean.UserServiceEnterpriseImpl()) defined, using it as the bean constructor for [EnhancedAnnotatedTypeImpl] public @SessionScoped @Named class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl]]
WELD-000004: Exactly one post construct method ([EnhancedAnnotatedMethodImpl] @PostConstruct private org.senyu.intranet.managedbean.UserServiceEnterpriseImpl.initCurrentUser()) for [EnhancedAnnotatedTypeImpl] public @SessionScoped @Named class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl]]
WELD-001536: Found [] constructors annotated with @Inject for [EnhancedAnnotatedTypeImpl] public @SessionScoped @Named class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl]]
WELD-000002: Exactly one constructor ([EnhancedAnnotatedConstructorImpl] public org.senyu.intranet.managedbean.UserServiceEnterpriseImpl()) defined, using it as the bean constructor for [EnhancedAnnotatedTypeImpl] public @SessionScoped @Named class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl]]
WELD-000012: Building bean metadata for class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl]]
WELD-000010: Using qualifiers [@javax.enterprise.inject.Default(), @javax.inject.Named(value=userService), @javax.enterprise.inject.Any()] for Managed Bean [class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl] with qualifiers [@Default @Named @Any]]]
WELD-000014: Using name userService for Managed Bean [class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl] with qualifiers [@Default @Named @Any]]]
WELD-000016: Using scope interface javax.enterprise.context.SessionScoped for Managed Bean [class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl] with qualifiers [@Default @Named @Any]]]
WELD-000106: Bean: Managed Bean [class org.senyu.intranet.managedbean.UserServiceEnterpriseImpl] with qualifiers [@Default @Named @Any]]]
  HHH000346: Error during managed flush [WELD-001308: Unable to resolve any beans for Type: interface org.senyu.core.common.user.UserService; Qualifiers: [@javax.enterprise.inject.Default(), @javax.enterprise.inject.Any()]]]]
org.jboss.weld.exceptions.UnsatisfiedResolutionException: WELD-001308: Unable to resolve any beans for Type: interface org.senyu.core.common.user.UserService; Qualifiers: [@javax.enterprise.inject.Default(), @javax.enterprise.inject.Any()]
    at org.senyu.intranet.entity.user.UserServiceProviderEnterpriseImpl.getUserService(UserServiceProviderEnterpriseImpl.java:17)
Caused by: org.jboss.weld.exceptions.UnsatisfiedResolutionException: WELD-001308: Unable to resolve any beans for Type: interface org.senyu.core.common.user.UserService; Qualifiers: [@javax.enterprise.inject.Default(), @javax.enterprise.inject.Any()]
    at org.senyu.intranet.entity.user.UserServiceProviderEnterpriseImpl.getUserService(UserServiceProviderEnterpriseImpl.java:17)
Caused by: org.jboss.weld.exceptions.UnsatisfiedResolutionException: WELD-001308: Unable to resolve any beans for Type: interface org.senyu.core.common.user.UserService; Qualifiers: [@javax.enterprise.inject.Default(), @javax.enterprise.inject.Any()]
    at org.senyu.intranet.entity.user.UserServiceProviderEnterpriseImpl.getUserService(UserServiceProviderEnterpriseImpl.java:17)
Caused by: org.jboss.weld.exceptions.UnsatisfiedResolutionException: WELD-001308: Unable to resolve any beans for Type: interface org.senyu.core.common.user.UserService; Qualifiers: [@javax.enterprise.inject.Default(), @javax.enterprise.inject.Any()]
    at org.senyu.intranet.entity.user.UserServiceProviderEnterpriseImpl.getUserService(UserServiceProviderEnterpriseImpl.java:17)

Answer 1

使用迭代器查找 bean 是不正确的。该集合可能为空，这意味着该类型的 bean 尚不存在。

由于您已经在使用 CDI 1.1 API，最好使用CDI.current().select(UserService.class).get()