我在调用远程 EJB 时遇到问题:第一次我必须这样做,而且我可能会丢失一些东西。我在网上阅读了很多教程,并在 SO
上找到了几个答案,但我无法解决。这就是我到目前为止所做的。
我的场景是:
我在 Wildfly 10.0.0.Final
下部署了两个 EAR
:server-ear
和 client-ear
.
在server-ear
中,我有server-api
和server-ejb
,第一个是一个简单的Java模块,其中包含我的EJB
接口(interface),第二个是包含实现的 EJB
模块。
那些将是
@Remote
public interface DummyApi {
String getSomething();
}
及其实现
@Stateless
@Remote(DummyApi.class)
public class DummyApiImpl implements DummyApi {
@Override
public String getSomething() {
return "SOMETHING";
}
}
在 client-ear
中,我有一个简单的 EJB
模块 (client-ejb
),它定义了一个单例 EJB
它引用 DummyApi
接口(interface):
@javax.ejb.Singleton
public class DummyClient {
private static final Logger log = LoggerFactory.getLogger(DummyClient.class);
private @EJB DummyApi dummyApi;
@PostConstruct
public void postConstruct() {
log.debug("***** " + dummyApi.getSomething() + "******");
}
}
在 client-ejb
中,我还将 jboss-ejb-client.properties
文件放置在 src/main/resources
下
remote.connectionprovider.create.options.org.xnio.Options.SSL_ENABLED=false
remote.connections=default
remote.connection.default.host=localhost
remote.connection.default.port = 8080
remote.connection.default.connect.options.org.xnio.Options.SASL_POLICY_NOANONYMOUS=false
至于这些模块的相互依赖关系(我使用的是 Maven):
server-ear
|---- server-api [compile]
|---- server-ejb [compile]
|-- server-api [provided]
和
client-ear
|---- server-api [compile]
|---- client-ejb [compile]
|-- server-api [provided]
两个 EAR
都部署在同一个本地 Wildfly 10.0.0.Final
上(服务器的全新安装,没有任何自定义)。当我启动服务器时,我在 server-ear
中没有任何问题。
client-ear
相反失败并出现以下异常
12:05:22,592 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-5) MSC000001: Failed to start service jboss.deployment.subunit."client-ear-0.0.1-SNAPSHOT.ear"."client-ejb-0.0.1-SNAPSHOT.jar".INSTALL: org.jboss.msc.service.StartException in service jboss.deployment.subunit."client-ear-0.0.1-SNAPSHOT.ear"."client-ejb-0.0.1-SNAPSHOT.jar".INSTALL: WFLYSRV0153: Failed to process phase INSTALL of subdeployment "client-ejb-0.0.1-SNAPSHOT.jar" of deployment "client-ear-0.0.1-SNAPSHOT.ear"
at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:154)
at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1948)
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1881)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.jboss.as.server.deployment.DeploymentUnitProcessingException: WFLYEE0052: Failed to install component DummyClient
at org.jboss.as.ee.component.deployers.ComponentInstallProcessor.deploy(ComponentInstallProcessor.java:109)
at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:147)
... 5 more
Caused by: org.jboss.as.server.deployment.DeploymentUnitProcessingException: WFLYEJB0406: No EJB found with interface of type 'com.server.api.DummyApi' for binding com.client.DummyClient/dummyApi
at org.jboss.as.ejb3.deployment.processors.EjbInjectionSource.getResourceValue(EjbInjectionSource.java:90)
at org.jboss.as.ee.component.deployers.ComponentInstallProcessor.processBindings(ComponentInstallProcessor.java:263)
at org.jboss.as.ee.component.deployers.ComponentInstallProcessor.access$000(ComponentInstallProcessor.java:80)
at org.jboss.as.ee.component.deployers.ComponentInstallProcessor$1.handle(ComponentInstallProcessor.java:215)
at org.jboss.as.ee.component.ClassDescriptionTraversal.run(ClassDescriptionTraversal.java:54)
at org.jboss.as.ee.component.deployers.ComponentInstallProcessor.deployComponent(ComponentInstallProcessor.java:218)
at org.jboss.as.ee.component.deployers.ComponentInstallProcessor.deploy(ComponentInstallProcessor.java:101)
... 6 more
我错过了什么或做错了什么?
最佳答案
@EJB 仅当 bean 位于同一包(在您的情况下为 .ear)上时才起作用。
您将需要使用启动时出现在服务器日志中的 java:app 名称进行查找。像这样的事情:
DummyApi api = (DummyApi) context.lookup("/server-ear/server-ejb/DummyApiImpl!path.to.DummyApi")
创建上下文:
private static Context createContextWildfly(String provider) throws NamingException {
final Hashtable<String, String> properties = new Hashtable<>();
properties.put(Context.URL_PKG_PREFIXES, "org.jboss.ejb.client.naming");
properties.put(Context.INITIAL_CONTEXT_FACTORY, "org.jboss.naming.remote.client.InitialContextFactory");
properties.put("jboss.naming.client.ejb.context", "true");
properties.put(Context.PROVIDER_URL, "http-remoting://127.0.0.1:8080");
return new InitialContext(properties);
}
使用这个你不需要jboss-ejb-client.properties
关于java - EJB远程调用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42856683/