在多项目环境中避免模糊依赖的众所周知的策略

时间：2016-04-11 17:35:56

标签： java java-ee cdi glassfish-4 java-ee-7

我有一个多个Maven项目的设置，最终打包为EAR存档。 那些项目属于Type jar，ejb或war。

现在我有一个javax.enterprise.context.SessionScoped CDI Bean， 注释为javax.enterprise.inject.Default， 提供有关当前用户的信息（主要从Shiro-Framework检索）。 我还有两个自治的Web应用程序，应该使用这个Bean，所以我将Bean放在一个项目中，由两个项目引用

我现在的问题是，我在部署期间遇到异常，告诉我Bean无法被注入，因为有两种可能的依赖关系，指的是完全相同的类。 我想这是因为包含Bean（Jar项目）的项目附加到两个Web项目，并且多次发现了Bean。

所以这是我的问题： 是否有一个众所周知的策略来处理这类问题，或者某些方法来表示Application Server / CDI实现（Glassfish 4.x在我的案例中使用Weld Framework），只读一次？

我确实注意到有可能使用javax.enterprise.inject.Instance，但我不想使用它，因为对于应用程序而言，允许对当前操作用户的快照进行变化的可能性至关重要。 我还考虑过通过API和实现项目提供这些Bean的方法，仅引用API作为依赖项，但这会产生巨大的开销，因为这些项目目前每个只包含一个类。

这是我的Beans Class Header：

package omega1001.mediaserver.domainmodel.web;

import ...;


@SessionScoped
@Default
public class OmegaMediaServerSubject implements Serializable {

这就是我尝试注入Bean的方式：

@Inject
    private OmegaMediaServerSubject subject;

这是我在部署中遇到的例外：

org.jboss.weld.exceptions.DeploymentException: WELD-001409: Ambiguous dependencies for type OmegaMediaServerSubject with qualifiers @Default
  at injection point [BackedAnnotatedField] @Inject private omega1001.mediaserver.servlet.messageProcessor.DefaultMessageProcessor.subject
  at omega1001.mediaserver.servlet.messageProcessor.DefaultMessageProcessor.subject(DefaultMessageProcessor.java:0)
  Possible dependencies: 
  - Managed Bean [class omega1001.mediaserver.domainmodel.web.OmegaMediaServerSubject] with qualifiers [@Default @Any],
  - Managed Bean [class omega1001.mediaserver.domainmodel.web.OmegaMediaServerSubject] with qualifiers [@Default @Any]
    at org.jboss.weld.bootstrap.Validator.validateInjectionPointForDeploymentProblems(Validator.java:367)
    at org.jboss.weld.bootstrap.Validator.validateInjectionPoint(Validator.java:281)
    at org.jboss.weld.bootstrap.Validator.validateGeneralBean(Validator.java:134)
    at org.jboss.weld.bootstrap.Validator.validateRIBean(Validator.java:155)
    at org.jboss.weld.bootstrap.Validator.validateBean(Validator.java:518)
    at org.jboss.weld.bootstrap.Validator.validateBeans(Validator.java:504)
    at org.jboss.weld.bootstrap.Validator.validateDeployment(Validator.java:479)
    at org.jboss.weld.bootstrap.WeldStartup.validateBeans(WeldStartup.java:443)
    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 org.glassfish.admin.rest.utils.ResourceUtil.runCommand(ResourceUtil.java:253)
    at org.glassfish.admin.rest.utils.ResourceUtil.runCommand(ResourceUtil.java:231)
    at org.glassfish.admin.rest.utils.ResourceUtil.runCommand(ResourceUtil.java:275)
    at org.glassfish.admin.rest.resources.TemplateListOfResource.createResource(TemplateListOfResource.java:133)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(ResourceMethodInvocationHandlerFactory.java:81)
    at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:144)
    at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:161)
    at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:160)
    at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:99)
    at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:389)
    at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:347)
    at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102)
    at org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:309)
    at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)
    at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:267)
    at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317)
    at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:292)
    at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1139)
    at org.glassfish.jersey.grizzly2.httpserver.GrizzlyHttpContainer.service(GrizzlyHttpContainer.java:375)
    at org.glassfish.admin.rest.adapter.RestAdapter$2.service(RestAdapter.java:316)
    at org.glassfish.admin.rest.adapter.RestAdapter.service(RestAdapter.java:179)
    at com.sun.enterprise.v3.services.impl.ContainerMapper$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:206)
    at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:180)
    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:283)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:200)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:132)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:111)
    at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
    at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:536)
    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$Worker.doWork(AbstractThreadPool.java:591)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:571)
    at java.lang.Thread.run(Thread.java:745)

1 个答案:

答案 0 :(得分：0)

我现在明白了这一点。

正如史蒂夫C所指出的那样：

包含相关Bean的项目与两个Web项目一起打包。

简单的解决方案是将Dependencies Maven范围更改为Web项目中提供的范围，然后在EAR中将其作为库提供。

所以回答我的问题：

是的，有一个众所周知的策略来处理这类问题，确保提供包含您的共享Bean的项目以获得更大的图片，但从未实际将项目打包到除目标之外的任何其他项目EAR。

感谢Steve C，给出了方向

致以最诚挚的问候，

J.Adam

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