[EJB 3.0] - Re: Newbie: how to interface EJB code with external librarie
by itsme
Well let's try to answer that.
Think of EJB's as a facade in front of any complex functionality that should be executed remote and/or local with transactions and in a multi user environment. Stateless and stateful session beans are doing something for you while entities (pre EJB 3.0 entity beans) are business object which (mostly) get stored into a database.
So for example you can write a (stateful) session bean that manages the login and logoff off users. So here is the (at least for me) very simple hint for using EJB's: Keep things simple. Each ejb must have its own clear context.
For transactions (I think transactions are important for a trade system) there is nothing to do. You get them right out of the box if you're using container managed transactions.
For the ui by using jsf I personally prefer having one backing bean for one screen (i.e. login/logoff-ui). This backing bean can delegate its work to a ejb (that login facade mentioned above).
To concluse I would recommend to analyse the system carefully and do design the new app by using a combination of JSF and EJB.
Hope this helps in a way.
Regards
\sandor\
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17 years, 8 months
[JBoss Portal] - error in start of jbp 2.7B1
by jsports
something error about wsrp consumer?
| 008-08-06 15:32:45,359 DEBUG [org.hibernate.cache.UpdateTimestampsCache] Invalidating space [JBP_REG_PROPERTY], timestamp: 4988960626110479
| 2008-08-06 15:32:45,359 ERROR [org.jboss.varia.scheduler.Scheduler$Listener] Invoke of the Schedulable MBean failed
| javax.management.MBeanException
| at org.jboss.mx.interceptor.ReflectedDispatcher.handleInvocationExceptions(ReflectedDispatcher.java:180)
| at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:163)
| at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
| at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133)
| at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
| at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142)
| at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
| at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
| at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
| at org.jboss.varia.scheduler.Scheduler$MBeanListener.handleNotification(Scheduler.java:1346)
| at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
| at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
| at java.lang.reflect.Method.invoke(Method.java:597)
| at org.jboss.mx.notification.NotificationListenerProxy.invoke(NotificationListenerProxy.java:153)
| at $Proxy11.handleNotification(Unknown Source)
| at javax.management.NotificationBroadcasterSupport.handleNotification(NotificationBroadcasterSupport.java:257)
| at javax.management.NotificationBroadcasterSupport$SendNotifJob.run(NotificationBroadcasterSupport.java:322)
| at javax.management.NotificationBroadcasterSupport$1.execute(NotificationBroadcasterSupport.java:307)
| at javax.management.NotificationBroadcasterSupport.sendNotification(NotificationBroadcasterSupport.java:229)
| at javax.management.timer.Timer.sendNotification(Timer.java:1234)
| at javax.management.timer.Timer.notifyAlarmClock(Timer.java:1203)
| at javax.management.timer.TimerAlarmClock.run(Timer.java:1286)
| at java.util.TimerThread.mainLoop(Timer.java:512)
| at java.util.TimerThread.run(Timer.java:462)
| Caused by: org.jboss.portal.portlet.InvokerUnavailableException: Problem getting service description for producer self, please see the logs for more information.
| at org.jboss.portal.wsrp.consumer.WSRPConsumerImpl.getPortlets(WSRPConsumerImpl.java:155)
| at org.jboss.portal.portlet.federation.impl.FederatedPortletInvokerService.getPortlets(FederatedPortletInvokerService.java:89)
| at org.jboss.portal.core.management.PortletDiscoveryService.processPortletDiscovery(PortletDiscoveryService.java:89)
| at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
| at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
| at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
| at java.lang.reflect.Method.invoke(Method.java:597)
| at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
| ... 22 more
| Caused by: java.io.IOException: Could not transmit message
| at org.jboss.ws.core.client.HTTPRemotingConnection.invoke(HTTPRemotingConnection.java:255)
| at org.jboss.ws.core.client.SOAPProtocolConnectionHTTP.invoke(SOAPProtocolConnectionHTTP.java:73)
| at org.jboss.ws.core.CommonClient.invoke(CommonClient.java:339)
| at org.jboss.ws.core.jaxrpc.client.CallImpl.invokeInternal(CallImpl.java:517)
| at org.jboss.ws.core.jaxrpc.client.CallImpl.invoke(CallImpl.java:277)
| at org.jboss.ws.core.jaxrpc.client.PortProxy.invoke(PortProxy.java:156)
| at $Proxy224.getServiceDescription(Unknown Source)
| at org.jboss.portal.wsrp.services.ServiceDescriptionServiceWrapper.getServiceDescription(ServiceDescriptionServiceWrapper.java:49)
| at org.jboss.portal.wsrp.consumer.ProducerInfo.getUnmanagedServiceDescription(ProducerInfo.java:715)
| at org.jboss.portal.wsrp.consumer.ProducerInfo.internalRefresh(ProducerInfo.java:348)
| at org.jboss.portal.wsrp.consumer.ProducerInfo.detailedRefresh(ProducerInfo.java:282)
| at org.jboss.portal.wsrp.consumer.ProducerInfo.refresh(ProducerInfo.java:277)
| at org.jboss.portal.wsrp.consumer.ProducerInfo.getPortletMap(ProducerInfo.java:663)
| at org.jboss.portal.wsrp.consumer.WSRPConsumerImpl.getPortlets(WSRPConsumerImpl.java:150)
| ... 29 more
| Caused by: org.jboss.remoting.CannotConnectException: Can not connect http client invoker. Connection refused: connect.
| at org.jboss.remoting.transport.http.HTTPClientInvoker.useHttpURLConnection(HTTPClientInvoker.java:348)
| at org.jboss.remoting.transport.http.HTTPClientInvoker.transport(HTTPClientInvoker.java:137)
| at org.jboss.remoting.MicroRemoteClientInvoker.invoke(MicroRemoteClientInvoker.java:122)
| at org.jboss.remoting.Client.invoke(Client.java:1634)
| at org.jboss.remoting.Client.invoke(Client.java:548)
| at org.jboss.ws.core.client.HTTPRemotingConnection.invoke(HTTPRemotingConnection.java:233)
| ... 42 more
| Caused by: java.net.ConnectException: Connection refused: connect
| at java.net.PlainSocketImpl.socketConnect(Native Method)
| at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
| at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
| at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
| at java.net.Socket.connect(Socket.java:519)
| at sun.net.NetworkClient.doConnect(NetworkClient.java:152)
| at sun.net.www.http.HttpClient.openServer(HttpClient.java:394)
| at sun.net.www.http.HttpClient.openServer(HttpClient.java:529)
| at sun.net.www.http.HttpClient.<init>(HttpClient.java:233)
| at sun.net.www.http.HttpClient.New(HttpClient.java:306)
| at sun.net.www.http.HttpClient.New(HttpClient.java:323)
| at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:788)
| at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:729)
| at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:654)
| at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:832)
| at org.jboss.remoting.transport.http.HTTPClientInvoker.useHttpURLConnection(HTTPClientInvoker.java:277)
| ... 47 more
| 2008-08-06 15:32:45,359 DEBUG [org.jboss.varia.scheduler.Scheduler$Listener] Remaining Repititions: -1, wait for next call to stop: false
| 2008-08-06 15:32:47,375 DEBUG [org.jbpm.job.executor.JobExecutorThread] acquiring jobs for execution...
|
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17 years, 8 months