我爲AS 6本地主機部署我的耳朵一個獨立的JBoss時，爲什麼我收到以下錯誤有點糊塗：指定的參考是由多於一個EJB匹配 - EJB 3.1
「了java.lang.RuntimeException ：指定的參考（ForecastUtilityLocal'）是由多於一個EJB」匹配 - 詳見下文...
DEPLOYMENTS IN ERROR: Deployment "vfs:///C:/jboss/jboss-6.0.0.Final/server/default/deploy/ear-1.0.0.ear" is in error due to the following reason(s): java.lang.RuntimeException: Specified reference [EJB Reference: beanI erface 'com.ls.forecast.ejb.util.ForecastUtilityLocal', beanName 'null', mappedName 'null', lookupName 'null', owning unit '[email protected]{org.jboss.metadata.ejb.jboss.JBossEnte riseBeanMetaData.ExpectedReturnEngineServiceImpl}'] was matched by more than one EJB: [[email protected]{ForecastCacheManager}, org.jboss.metadata.ejb. [email protected]{ForecastUtility}]. Specify beanName explciitly or ensure beanInterface is unique.
at org.jboss.deployers.plugins.deployers.DeployersImpl.checkComplete(DeployersImpl.java:1228) [:2.2.0.GA]
at org.jboss.deployers.plugins.main.MainDeployerImpl.checkComplete(MainDeployerImpl.java:905) [:2.2.0.GA]
at org.jboss.system.server.profileservice.deployers.MainDeployerPlugin.checkComplete(MainDeployerPlugin.java:87) [:6.0.0.Final]
at org.jboss.profileservice.deployment.ProfileDeployerPluginRegistry.checkAllComplete(ProfileDeployerPluginRegistry.java:107) [:0.2.2]
at org.jboss.system.server.profileservice.bootstrap.BasicProfileServiceBootstrap.start(BasicProfileServiceBootstrap.java:135) [:6.0.0.Final]
at org.jboss.system.server.profileservice.bootstrap.BasicProfileServiceBootstrap.start(BasicProfileServiceBootstrap.java:56) [:6.0.0.Final]
at org.jboss.bootstrap.impl.base.server.AbstractServer.startBootstraps(AbstractServer.java:827) [jboss-bootstrap-impl-base.jar:2.1.0-alpha-5]
at org.jboss.bootstrap.impl.base.server.AbstractServer$StartServerTask.run(AbstractServer.java:417) [jboss-bootstrap-impl-base.jar:2.1.0-alpha-5]
at java.lang.Thread.run(Thread.java:619) [:1.6.0_20]
這個EJB標註有@Singleton所以怎麼可能有不止一個實例嗎？
@Singleton
@Local(ForecastUtilityLocal.class)
public class ForecastUtility implements ForecastUtilityLocal {
private static final Logger logger = LoggerFactory
.getLogger(ForecastUtility.class);
@EJB
private CacheHelperLocal cacheHelper;
....
}
這是例如在不同的EJB引用，如：
@Singleton
@Startup
@Local(CacheHelperLocal.class)
public class CacheHelper implements CacheHelperLocal {
@EJB
private ForecastModelUtilityLocal forecastModelUtility;
@EJB
private ConnectionManagerLocal connectionManager;
@EJB
private ForecastCacheManagerLocal forecastCacheManager;
@EJB
private ForecastUtilityLocal forecastUtility;
...
}