【发布时间】：2012-07-09 06:48:19
【问题描述】：
我是 JBoss 7 的新手。我面临着奇怪的行为。有时，当我尝试调用会话 bean 时，会遇到以下异常：
com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract java.util.List myServlet.getData() throws myException' threw an unexpected exception: java.lang.IllegalStateException: No EJB receiver available for handling [appName:myAppNameEE,modulename:myModuleEJB,distinctname:] combination for invocation context org.jboss.ejb.client.EJBClientInvocationContext@3e23bd28
这通常发生在从 Eclipse 运行我的 GWT 应用程序时。异常并不总是发生。有时它发生的次数比其他次数少。有时，每次我调用会话 bean 时都会发生这种情况，这很痛苦。我阅读了教程（https://docs.jboss.org/author/display/AS71/EJB+invocations+from+a+remote+client+using+JNDI?_sscc=t），我很确定有 jboss- ejb-client.properties 在正确的位置。
我的 jboss-ejb-client 看起来像：
endpoint.name=myAppEE/myAppEJB
remote.connectionprovider.create.options.org.xnio.Options.SSL_ENABLED=false
remote.connections=default
remote.connection.default.host=localhost
remote.connection.default.port = 4447
remote.connection.default.connect.options.org.xnio.Options.SASL_POLICY_NOANONYMOUS=false
它位于：
myAppEJB\ejbModule\com\myApp\ejb\conf
业务代表：
public class myAppServerDelegate extends ServerDelegate{
private Logger logger = Logger.getLogger(myAppServerDelegate.class.getName());
private myAppRemote theSession = null;
public myAppServerDelegate() throws Exception {
try {
theSession = (myAppRemote) getJndiContext().lookup(getJindiLookupName(myAppServerDelegate.class, myAppRemote.class));
} catch (NamingException e) {
throw (e);
}
}
public List<myDataDTO> getAllmyDataBy(String a, String b,
String c, String d,Integer e,
Integer f) throws ServerDelegateException {
return theSession.getAllmyDataBy(a, b, c, d,e,f);
}
public Integer getCountmyDataBy(String a, String b, String c, String d) throws ServerDelegateException {
return theSession.getCountmyDataBy(a, b, c, d);
}
...
public String getServiceMessage() {
return theSession.getServiceMessage();
}
...
}
会话 bean：
@Stateless
public class myAppSession implements myAppRemote {
private Logger logger = Logger.getLogger(myAppSession.class.getName());
@PersistenceContext
protected EntityManager entityManager;
@EJB
private myAppHomeLocal beanmyApp;
...
public String getServiceMessage() {
return "MESSAGGIODISERVIZIO";
}
public List<myDataDTO> getAllmyDataBy(String a,String b,
String c, String d,Integer e,
Integer f) throws ServerDelegateException {
logger.info("myAppSession.getAllmyDataBy.");
List<myData> entityList = findByParms(a, b, c, d,e,f);
return myDataAssemblyDTO.getmyDataDTOList(entityList);
}
public Integer getCountmyDataBy(String a,String b, String c, String d) throws ServerDelegateException {
return findByParmsCount(a, b, c, d);
}
...
}
小服务程序：
...
@SuppressWarnings("serial")
公共类 MyGenericServiceImpl 扩展 RemoteServiceServlet 实现 MyGenericService {
private MyAppServerDelegate myAppServerDelegate = null;
public MyGenericServiceImpl() throws Exception{
super();
myAppServerDelegate = new MyAppServerDelegate();
}
private MyAppServerDelegate getDelegate() {
return myAppServerDelegate;
}
private myGWTException buildLocalExceptionFromServerException(ServerDelegateException sde) {
myGWTException x = new myGWTException();
x.setParms(sde.guiMessage,sde.timestamp,sde.tipoEvento);
return x;
}
@Override
public PagingLoadResult<myDataBean> getAllmyDataBy(String a, String b, String c, PagingLoadConfig plc) throws MyGWTException {
try {
String cs = ((UserSessionBean)this.getThreadLocalRequest().getSession().getAttribute("user")).getCodiceStudio();
List<myDataBean> tsb = MyDataClientAssembly.getMyDataBeanList(myAppServerDelegate.getAllmyDataBy(cs, a, b, c, plc.getOffset(), plc.getLimit()));
return new BasePagingLoadResult<MyDataBean>(tsb, plc.getOffset(), myDataServerDelegate.getCountmyDataBy(cs, a, b, c));
} catch (ServerDelegateException sde) {
throw buildLocalExceptionFromServerException(sde);
}
}
@Override
public String getServiceMessage() {
return getDelegate().getServiceMessage();
}
@Override
public Integer getCountmyDataBy(String a, String b, String c) throws AmbrogioGWTException {
try {
String cs = ((UserSessionBean)this.getThreadLocalRequest().getSession().getAttribute("user")).getCs();
return myAppServerDelegate.getCountmtDataBy(cs, a, b, c);
} catch (ServerDelegateException sde) {
throw buildLocalExceptionFromServerException(sde);
}
}
}
服务器委托：
public class ServerDelegate {
static public String getJindiLookupName( Class<?> theBeanClass, Class<?> theSessionClass) throws NamingException {
String jbossServerName = System.getProperty("jboss.server.name");
if (jbossServerName== null || "".equals(jbossServerName)){
return "myAppEE/myAppEJB/"+ theBeanClass.getSimpleName() + "!" + theSessionClass.getName();
}else{
return "java:global/myAppEE/myAppEJB/" + theBeanClass.getSimpleName() + "!" + theSessionClass.getName();
}
}
static public Context getJndiContext() throws NamingException {
System.out.println("ServerDelegate.getJndiContext");
final Properties jndiProperties = new Properties();
String jbossServerName = System.getProperty("jboss.server.name");
if (jbossServerName== null || "".equals(jbossServerName)){
jndiProperties.put(Context.INITIAL_CONTEXT_FACTORY, org.jboss.naming.remote.client.InitialContextFactory.class.getName());
jndiProperties.put(Context.PROVIDER_URL, "remote://localhost:4447");
jndiProperties.put("jboss.naming.client.ejb.context", true);
jndiProperties.put("jboss.naming.client.connect.options.org.xnio.Options.SASL_POLICY_NOPLAINTEXT", "false");
}
return new InitialContext(jndiProperties);
}
}
我不知道发生了什么。 TIA。
弗朗西斯科
【问题讨论】：
-
我更深入地研究了这个问题。当我在 JBoss 下部署 gwt .war 和 ejb .jar 作为 .ear 模块时，一切正常。但是，如果我在 Eclipse 的嵌入式 Jetty 下运行 gwt 模块，在 JBoss 下运行 ejb 模块，我会得到 No EJB Receiver 异常。
-
有人吗？也许我缺少一些信息？