Java 如何在web服务中正确注入单例EJB

我在Web服务中使用EJB时遇到问题。当我试图在客户端应用程序中调用webmethod时，出现了NullPointerException错误，表明我的EJB为null。 我使用的是wildfly-10.1.0-Final服务器

我的EJB类：

@Singleton
@Startup
public class ParkEJB {
 private Map<Integer,Spot> zone;

    public ParkEJB(){
     zone = new HashMap<Integer,Spot>();
     zone.put(1, new Spot());
    }
    public void takePlaceAtIndex(int placeID){
     Spot spot;
     if((spot = zone.get(placeID)) != null)
        spot.setFree(false);
    }

}

网络服务：

@WebService()
public class Service {
 @EJB
 private ParkEJB park; 

 @WebMethod
 public void takePlace(int placeID){
     park.takePlaceAtIndex(placeID);
 }
}

web服务客户端：

public class ServiceClient {
  public static void main(String[] argv) {
     Service service = new ServiceService().getServicePort();
     service.takePlace(1);
  }
}

运行ServiceClient.main时，我有：

Exception in thread "main" com.sun.xml.ws.fault.ServerSOAPFaultException: Client received SOAP Fault from server: java.lang.NullPointerException Please see the server log to find more detail regarding exact cause of the failure.
at com.sun.xml.ws.fault.SOAP11Fault.getProtocolException(SOAP11Fault.java:193)
at com.sun.xml.ws.fault.SOAPFaultBuilder.createException(SOAPFaultBuilder.java:126)
at com.sun.xml.ws.client.sei.StubHandler.readResponse(StubHandler.java:252)
at com.sun.xml.ws.db.DatabindingImpl.deserializeResponse(DatabindingImpl.java:181)
at com.sun.xml.ws.db.DatabindingImpl.deserializeResponse(DatabindingImpl.java:262)
at com.sun.xml.ws.client.sei.SyncMethodHandler.invoke(SyncMethodHandler.java:128)
at com.sun.xml.ws.client.sei.SyncMethodHandler.invoke(SyncMethodHandler.java:102)
at com.sun.xml.ws.client.sei.SEIStub.invoke(SEIStub.java:154)
at com.sun.proxy.$Proxy34.takePlace(Unknown Source)
at example.ServiceClient.main(ServiceClient.java:8)

---

我做错了什么？为什么我的EJB是空的？

你检查过wildfly日志（stdout/stderr）有没有进一步的线索？@Bajal日志没有说太多。当我使用intellij debbuger时，它只显示ParkEJB为空。@agaha您能发布新ServiceService（）的代码吗？getServicePort（）请？

Exception in thread "main" com.sun.xml.ws.fault.ServerSOAPFaultException: Client received SOAP Fault from server: java.lang.NullPointerException Please see the server log to find more detail regarding exact cause of the failure.
at com.sun.xml.ws.fault.SOAP11Fault.getProtocolException(SOAP11Fault.java:193)
at com.sun.xml.ws.fault.SOAPFaultBuilder.createException(SOAPFaultBuilder.java:126)
at com.sun.xml.ws.client.sei.StubHandler.readResponse(StubHandler.java:252)
at com.sun.xml.ws.db.DatabindingImpl.deserializeResponse(DatabindingImpl.java:181)
at com.sun.xml.ws.db.DatabindingImpl.deserializeResponse(DatabindingImpl.java:262)
at com.sun.xml.ws.client.sei.SyncMethodHandler.invoke(SyncMethodHandler.java:128)
at com.sun.xml.ws.client.sei.SyncMethodHandler.invoke(SyncMethodHandler.java:102)
at com.sun.xml.ws.client.sei.SEIStub.invoke(SEIStub.java:154)
at com.sun.proxy.$Proxy34.takePlace(Unknown Source)
at example.ServiceClient.main(ServiceClient.java:8)