将远程 EJB 公开为 CDI bean

【问题标题】：Exposing remote EJBs as CDI beans将远程 EJB 公开为 CDI bean
【发布时间】：2014-10-25 14:15:17
【问题描述】：

下面给出了一个 CDI 托管 bean 的示例。

import javax.ejb.EJB;
import javax.inject.Named;
import javax.faces.view.ViewScoped;

@Named
@ViewScoped
public class ZoneManagedBean implements Serializable {

    @EJB
    private ZoneBeanRemote zoneService; //This is a remote EJB.
    private static final long serialVersionUID = 1L;
}

注解 @Inject 不支持用于将远程 EJB 注入到 CDI bean 中。

如何在此处将@EJB 替换为@Inject？

我测试的一些示例不起作用，我认为不需要在此处发布这些示例。

@ApplicationScoped
public class ReomteServiceProvider {

    @EJB
    private ZoneBeanRemote zoneBeanRemote;

    @Produces
    @Default
    public ZoneBeanRemote getZoneBeanRemote() {
        return zoneBeanRemote;
    }
}

当尝试前面的类（带有@Produces注解）时，部署过程终止并出现以下异常（不管该类上面的注解（@Alternative、@ApplicationScoped和@Named）是否包括或排除）：

Severe:   Exception during lifecycle processing
org.glassfish.deployment.common.DeploymentException: CDI deployment failure:WELD-001408: Unsatisfied dependencies for type ZoneBeanRemote with qualifiers @Default
  at injection point [BackedAnnotatedField] @Inject private admin.bean.ZoneManagedBean.zoneService
  at admin.bean.ZoneManagedBean.zoneService(ZoneManagedBean.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 ZoneBeanRemote with qualifiers @Default
  at injection point [BackedAnnotatedField] @Inject private admin.bean.ZoneManagedBean.zoneService
  at admin.bean.ZoneManagedBean.zoneService(ZoneManagedBean.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
Severe:   Exception while loading the app : CDI deployment failure:WELD-001408: Unsatisfied dependencies for type ZoneBeanRemote with qualifiers @Default
  at injection point [BackedAnnotatedField] @Inject private admin.bean.ZoneManagedBean.zoneService
  at admin.bean.ZoneManagedBean.zoneService(ZoneManagedBean.java:0)
org.jboss.weld.exceptions.DeploymentException: WELD-001408: Unsatisfied dependencies for type ZoneBeanRemote with qualifiers @Default
  at injection point [BackedAnnotatedField] @Inject private admin.bean.ZoneManagedBean.zoneService
  at admin.bean.ZoneManagedBean.zoneService(ZoneManagedBean.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)

P.S：我（目前）在带有 JDK 8u25 的 GlassFish Server 4.1 上运行。

【问题讨论】：

  • 你尝试这个时发生了什么？
  • 除了像 Unsatisfied dependency: no bean matches the injection point 那样抛出通常的异常之外，什么都没有发生。
  • "@Producing" 一个 EJB 看起来很奇怪。而且，出于好奇，使用@EJB 有什么问题？如果我真的需要像你的情况那样摆脱@EJB注释，我会让RemoteServiceProvider实现与远程EJB相同的接口并将执行委托给zonebeanRemote。
  • 致后人：库包含存在问题（当时我错误地将 Java EE Web 配置文件库添加到 EJB 模块中）。否则在注入点不需要 @Default 注释。只有@Inject private ZoneBeanRemote zoneBeanRemote; 足以与各自的 CDI 生产者一起执行其连贯的任务。

标签： jakarta-ee ejb cdi java-ee-7 ejb-3.2


【解决方案1】：

好的，感谢您用完整的详细信息更新您的问题。

这里的问题是您的生产者使用了@Default 限定符。为了注入，您的注入点需要如下所示：

@Inject @Default private ZoneBeanRemote zoneBeanRemote;

那应该注入就好了。

【讨论】：

  • 其实他是在使用@EJB注解注入的，这不是CDI的一部分。使用 @Inject 应该可以工作，即使没有 @Default 限定符（因为如果没有指定，那是隐式限定符）
  • 在这种情况下并非如此。是的，理想情况下你不会使用@Default 限定符，我怀疑他实际上是在他的代码中解决这个问题。我怀疑他在 GF 中遇到了导致此问题的错误。
【解决方案2】：

CDI不支持直接注入remote ejb，需要在producer中进行remote lookup；

这是一个通过 CDI 与生产者一起使用 @Inject 远程 ejb 的示例：

生产者（在一个单独的类中）

@Produces
public RemoteEjbInterface getMyEjb() {
    Properties props = new Properties();
    //omit if the ejb is on the local server
    props.put(Context.PROVIDER_URL, iiopAddressOfTheRemoteServer);
    return (RemoteEjbInterface ) new InitialContext(props).lookup("com.example.RemoteEjbInterface"); 
}

在使用ejb的类中：

@Inject RemoteEjbInterface  myEjb;
...
myEjb.businessMethod();

在每次调用 businessMethod 时执行远程查找的注入：

@Inject Instance<RemoteEjbInterface>  myEjb;
...
myEjb.get().businessMethod();

【讨论】：

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