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jakarta-ee - 在类库中使用@Inject 注入(inject)EJB

转载 作者：行者123 更新时间：2023-12-02 03:22:12 30 4
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我有一个使用 GlassFish Server 4.1/Java EE 7 的成熟的 Java EE 应用程序。它是一个标准的 NetBeans 项目，即它不使用 Apache Maven。

该应用程序包含一个名为“ProjectLibrary”的类库，它被添加到两个模块，即 EE 模块和 Web 模块。 IDE 以图形方式显示了基本的树结构，如下所示。

enter image description here

需要将 EJB 注入(inject)到 JPA 实体监听器中，如下所示。

@ApplicationScoped
public class EntityListener {

    @Inject
    private Event<EntityChangeEvent> event;

    @EJB
    private UserService service;

    @PostPersist
    @PostUpdate
    @PostRemove
    public void onEntityChange(Entity entity) {
        event.fire(new EntityChangeEvent(Collections.singleton(service.getOwner(entity))));
    }
}

此监听器也存在于 EE 项目和类库中。

UserService 是一个无状态的本地 EJB。除非注解 @EJB 被 @Inject 替换，否则这将一致地工作，在这种情况下，将抛出以下异常。

Severe:   Exception during lifecycle processing
org.glassfish.deployment.common.DeploymentException: CDI deployment failure:WELD-001408: Unsatisfied dependencies for type UserService with qualifiers @Default
  at injection point [BackedAnnotatedField] @Inject private entity.listeners.EntityListener.service
  at entity.listeners.EntityListener.service(EntityListener.java:0)
    at org.glassfish.weld.WeldDeployer.event(WeldDeployer.java:234)
    at org.glassfish.kernel.event.EventsImpl.send(EventsImpl.java:131)
    at org.glassfish.internal.data.ApplicationInfo.load(ApplicationInfo.java:328)
    at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:496)
    at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:219)
    at org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:491)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$2$1.run(CommandRunnerImpl.java:539)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$2$1.run(CommandRunnerImpl.java:535)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:360)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$2.execute(CommandRunnerImpl.java:534)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$3.run(CommandRunnerImpl.java:565)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$3.run(CommandRunnerImpl.java:557)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:360)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:556)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1464)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.access$1300(CommandRunnerImpl.java:109)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1846)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1722)
    at com.sun.enterprise.v3.admin.AdminAdapter.doCommand(AdminAdapter.java:534)
    at com.sun.enterprise.v3.admin.AdminAdapter.onMissingResource(AdminAdapter.java:224)
    at org.glassfish.grizzly.http.server.StaticHttpHandlerBase.service(StaticHttpHandlerBase.java:189)
    at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167)
    at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:201)
    at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:175)
    at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235)
    at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:284)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:201)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:133)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:112)
    at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
    at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:561)
    at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:565)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:545)
    at java.lang.Thread.run(Thread.java:745)
Caused by: org.jboss.weld.exceptions.DeploymentException: WELD-001408: Unsatisfied dependencies for type UserService with qualifiers @Default
  at injection point [BackedAnnotatedField] @Inject private entity.listeners.EntityListener.service
  at entity.listeners.EntityListener.service(EntityListener.java:0)
    at org.jboss.weld.bootstrap.Validator.validateInjectionPointForDeploymentProblems(Validator.java:370)
    at org.jboss.weld.bootstrap.Validator.validateInjectionPoint(Validator.java:291)
    at org.jboss.weld.bootstrap.Validator.validateGeneralBean(Validator.java:134)
    at org.jboss.weld.bootstrap.Validator.validateRIBean(Validator.java:165)
    at org.jboss.weld.bootstrap.Validator.validateBean(Validator.java:529)
    at org.jboss.weld.bootstrap.Validator.validateBeans(Validator.java:515)
    at org.jboss.weld.bootstrap.Validator.validateDeployment(Validator.java:490)
    at org.jboss.weld.bootstrap.WeldStartup.validateBeans(WeldStartup.java:419)
    at org.jboss.weld.bootstrap.WeldBootstrap.validateBeans(WeldBootstrap.java:90)
    at org.glassfish.weld.WeldDeployer.event(WeldDeployer.java:225)
    ... 41 more

Severe:   Exception while loading the app
Severe:   Undeployment failed for context /Project-war
Finer:   initialize identitymaps
Warning:   session_manager_no_partition
Info:   No timers to be deleted for id: 94539334950977536
Info:   No timers to be deleted for id: 94539334950977536
Severe:   Exception while loading the app : CDI deployment failure:WELD-001408: Unsatisfied dependencies for type UserService with qualifiers @Default
  at injection point [BackedAnnotatedField] @Inject private entity.listeners.EntityListener.service
  at entity.listeners.EntityListener.service(EntityListener.java:0)
org.jboss.weld.exceptions.DeploymentException: WELD-001408: Unsatisfied dependencies for type UserService with qualifiers @Default
  at injection point [BackedAnnotatedField] @Inject private entity.listeners.EntityListener.service
  at entity.listeners.EntityListener.service(EntityListener.java:0)
    at org.jboss.weld.bootstrap.Validator.validateInjectionPointForDeploymentProblems(Validator.java:370)
    at org.jboss.weld.bootstrap.Validator.validateInjectionPoint(Validator.java:291)
    at org.jboss.weld.bootstrap.Validator.validateGeneralBean(Validator.java:134)
    at org.jboss.weld.bootstrap.Validator.validateRIBean(Validator.java:165)
    at org.jboss.weld.bootstrap.Validator.validateBean(Validator.java:529)
    at org.jboss.weld.bootstrap.Validator.validateBeans(Validator.java:515)
    at org.jboss.weld.bootstrap.Validator.validateDeployment(Validator.java:490)
    at org.jboss.weld.bootstrap.WeldStartup.validateBeans(WeldStartup.java:419)
    at org.jboss.weld.bootstrap.WeldBootstrap.validateBeans(WeldBootstrap.java:90)
    at org.glassfish.weld.WeldDeployer.event(WeldDeployer.java:225)
    at org.glassfish.kernel.event.EventsImpl.send(EventsImpl.java:131)
    at org.glassfish.internal.data.ApplicationInfo.load(ApplicationInfo.java:328)
    at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:496)
    at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:219)
    at org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:491)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$2$1.run(CommandRunnerImpl.java:539)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$2$1.run(CommandRunnerImpl.java:535)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:360)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$2.execute(CommandRunnerImpl.java:534)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$3.run(CommandRunnerImpl.java:565)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$3.run(CommandRunnerImpl.java:557)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:360)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:556)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1464)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.access$1300(CommandRunnerImpl.java:109)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1846)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1722)
    at com.sun.enterprise.v3.admin.AdminAdapter.doCommand(AdminAdapter.java:534)
    at com.sun.enterprise.v3.admin.AdminAdapter.onMissingResource(AdminAdapter.java:224)
    at org.glassfish.grizzly.http.server.StaticHttpHandlerBase.service(StaticHttpHandlerBase.java:189)
    at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167)
    at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:201)
    at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:175)
    at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235)
    at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:284)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:201)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:133)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:112)
    at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
    at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:561)
    at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:565)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:545)
    at java.lang.Thread.run(Thread.java:745)

是否正式禁止在类库中使用 @Inject 注入(inject) EJB？

GlassFish 4.1 使用 Weld 2.2.2 final 作为 CDI 实现。

最佳答案

如果您未能在您的应用程序库中包含 beans.xml，则其中的任何组件都将不符合 CDI 注入(inject)的条件，无论是作为接收注入(inject)点还是可注入(inject)到其他组件中.当您添加 beans.xml 时，您的库可以被注入(inject)，并且它的类现在可以使用 @Inject

注入(inject)

这是一个陷阱 22。库的目的是它几乎没有外部依赖性并且不知道它是如何使用的，因此您通常不会在其中包含 CDI 相关代码。

关于jakarta-ee - 在类库中使用@Inject 注入(inject)EJB，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/32600149/

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