Well-Known 在多项目环境中避免不明确依赖的策略
Well-Known Strategy to avoid Ambiguous dependencies in multi Project Environment
我有多个 Maven 项目的设置，最终打包为 EAR 存档。
这些项目的类型为 jar、ejb 或 war。
现在我有一个 javax.enterprise.context.SessionScoped CDI Bean，
注释为 javax.enterprise.inject.Default，
携带有关当前用户的信息（主要检索自 Shiro-Framework）。
我还有两个自治的 Web 应用程序，它们应该使用这个 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，告诉我无法注入 Bean，因为有两个可能的依赖项，指的是完全相同的 Class。
我猜这是因为包含 Bean 的项目（Jar 项目）被附加到两者 Web-Projects，因此 Bean 被多次发现。
所以这是我的问题：
是否有 well-known 策略来处理此类问题，或者是否有某种方式向应用程序服务器/CDI 实现发出信号（Glassfish 4.x 在我的例子中使用 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，因为允许改变当前操作用户的快照的可能性对应用程序至关重要。
我还考虑了通过 API 和实施项目提供这些 Bean 的方法，仅引用 API 作为依赖项，但这会产生巨大的开销，因为这些项目目前只包含一个 Class每个。
这是我的豆子Class Header:
package omega1001.mediaserver.domainmodel.web;
import ...;
@SessionScoped
@Default
public class OmegaMediaServerSubject implements Serializable {
这是我尝试注入 Bean 的方式：
@Inject
private OmegaMediaServerSubject subject;
这是我在部署时遇到的异常：
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.run(CommandRunnerImpl.java:539)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.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.execute(CommandRunnerImpl.java:534)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.run(CommandRunnerImpl.java:565)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.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.access00(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.invoke(ResourceMethodInvocationHandlerFactory.java:81)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.run(AbstractJavaResourceMethodDispatcher.java:144)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:161)
at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:160)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:99)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:389)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:347)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102)
at org.glassfish.jersey.server.ServerRuntime.run(ServerRuntime.java:309)
at org.glassfish.jersey.internal.Errors.call(Errors.java:271)
at org.glassfish.jersey.internal.Errors.call(Errors.java:267)
at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
at org.glassfish.jersey.internal.Errors.process(Errors.java:267)
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317)
at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:292)
at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1139)
at org.glassfish.jersey.grizzly2.httpserver.GrizzlyHttpContainer.service(GrizzlyHttpContainer.java:375)
at org.glassfish.admin.rest.adapter.RestAdapter.service(RestAdapter.java:316)
at org.glassfish.admin.rest.adapter.RestAdapter.service(RestAdapter.java:179)
at com.sun.enterprise.v3.services.impl.ContainerMapper$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.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.access0(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)
我现在明白了。
正如 Steve C 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 范围更改为在 Web 项目中提供，然后将其作为库提供在 EAR 中。
所以回答我的问题：
是的，有一个众所周知的策略来处理此类问题，通过确保提供包含您的共享 Bean 的项目以获得更大的图片，但实际上永远不要将该项目与除此之外的任何其他项目打包你的目标耳朵。
感谢 Steve C 提供指导
此致，
J.Adam
我有多个 Maven 项目的设置，最终打包为 EAR 存档。 这些项目的类型为 jar、ejb 或 war。
现在我有一个 javax.enterprise.context.SessionScoped CDI Bean，
注释为 javax.enterprise.inject.Default，
携带有关当前用户的信息（主要检索自 Shiro-Framework）。
我还有两个自治的 Web 应用程序，它们应该使用这个 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，告诉我无法注入 Bean，因为有两个可能的依赖项，指的是完全相同的 Class。 我猜这是因为包含 Bean 的项目（Jar 项目）被附加到两者 Web-Projects，因此 Bean 被多次发现。
所以这是我的问题： 是否有 well-known 策略来处理此类问题，或者是否有某种方式向应用程序服务器/CDI 实现发出信号（Glassfish 4.x 在我的例子中使用 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，因为允许改变当前操作用户的快照的可能性对应用程序至关重要。
我还考虑了通过 API 和实施项目提供这些 Bean 的方法，仅引用 API 作为依赖项，但这会产生巨大的开销，因为这些项目目前只包含一个 Class每个。
这是我的豆子Class Header:
package omega1001.mediaserver.domainmodel.web;
import ...;
@SessionScoped
@Default
public class OmegaMediaServerSubject implements Serializable {
这是我尝试注入 Bean 的方式：
@Inject
private OmegaMediaServerSubject subject;
这是我在部署时遇到的异常：
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.run(CommandRunnerImpl.java:539)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.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.execute(CommandRunnerImpl.java:534)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.run(CommandRunnerImpl.java:565)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.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.access00(CommandRunnerImpl.java:109)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1846)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1722)
at org.glassfish.admin.rest.utils.ResourceUtil.runCommand(ResourceUtil.java:253)
at org.glassfish.admin.rest.utils.ResourceUtil.runCommand(ResourceUtil.java:231)
at org.glassfish.admin.rest.utils.ResourceUtil.runCommand(ResourceUtil.java:275)
at org.glassfish.admin.rest.resources.TemplateListOfResource.createResource(TemplateListOfResource.java:133)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory.invoke(ResourceMethodInvocationHandlerFactory.java:81)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.run(AbstractJavaResourceMethodDispatcher.java:144)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:161)
at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$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.run(ServerRuntime.java:309)
at org.glassfish.jersey.internal.Errors.call(Errors.java:271)
at org.glassfish.jersey.internal.Errors.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.service(RestAdapter.java:316)
at org.glassfish.admin.rest.adapter.RestAdapter.service(RestAdapter.java:179)
at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167)
at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:206)
at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:180)
at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235)
at org.glassfish.grizzly.filterchain.ExecutorResolver.execute(ExecutorResolver.java:119)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:283)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:200)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:132)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:111)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:536)
at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access0(WorkerThreadIOStrategy.java:56)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$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)
我现在明白了。
正如 Steve C 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 范围更改为在 Web 项目中提供，然后将其作为库提供在 EAR 中。
所以回答我的问题：
是的，有一个众所周知的策略来处理此类问题，通过确保提供包含您的共享 Bean 的项目以获得更大的图片，但实际上永远不要将该项目与除此之外的任何其他项目打包你的目标耳朵。
感谢 Steve C 提供指导
此致，
J.Adam