我从互联网上获得了一个简单的 Java Web 服务示例程序:
import javax.jws.WebParam;
import javax.jws.WebService;
import javax.xml.ws.Endpoint;
import java.util.Date;
@WebService
interface IService {
void hello(@WebParam(name="username") String username);
}
@WebService(targetNamespace = "ServiceImpl", endpointInterface="IService")
class ServiceImp implements IService{
@Override
public void hello(@WebParam(name = "username") String username) {
System.out.println("hello " + username + " now is " + new Date());
}
}
public class ServiceMain {
public static void main(String[] args) {
String address = "http://localhost:7777/myService";
Endpoint.publish(address, new ServiceImp());
System.out.println("OK");
}
}
编译并运行时出现异常:
Exception in thread "main" java.lang.NullPointerException
at com.sun.xml.internal.ws.model.RuntimeModeler.getPortTypeName(RuntimeModeler.java:1618)
at com.sun.xml.internal.ws.model.RuntimeModeler.getPortTypeName(RuntimeModeler.java:1584)
at com.sun.xml.internal.ws.server.EndpointFactory.create(EndpointFactory.java:226)
at com.sun.xml.internal.ws.server.EndpointFactory.createEndpoint(EndpointFactory.java:144)
at com.sun.xml.internal.ws.api.server.WSEndpoint.create(WSEndpoint.java:563)
at com.sun.xml.internal.ws.api.server.WSEndpoint.create(WSEndpoint.java:545)
at com.sun.xml.internal.ws.transport.http.server.EndpointImpl.createEndpoint(EndpointImpl.java:308)
at com.sun.xml.internal.ws.transport.http.server.EndpointImpl.publish(EndpointImpl.java:231)
at com.sun.xml.internal.ws.spi.ProviderImpl.createAndPublishEndpoint(ProviderImpl.java:126)
at javax.xml.ws.Endpoint.publish(Endpoint.java:240)
at ServiceMain.main(ServiceMain.java:22)
那么这段代码片段哪里出错了,如何修复呢? 非常感谢。
最佳答案
您必须提供端点接口(interface)的完全限定名称。如果您想丢失端点接口(interface),请尝试此操作。
import javax.jws.WebParam;
import javax.jws.WebService;
import javax.xml.ws.Endpoint;
import java.util.Date;
interface IService {
void hello(String username);
}
@WebService(targetNamespace = "ServiceImpl")
class ServiceImp implements IService{
public void hello(@WebParam(name = "username") String username) {
System.out.println("hello " + username + " now is " + new Date());
}
}
public class ServiceMain {
public static void main(String[] args) {
String address = "http://localhost:7777/myService";
Endpoint.publish(address, new ServiceImp());
System.out.println("OK");
}
}
否则,假设您的端点接口(interface)位于名为 your.pkg 的包中,请尝试此操作。
package your.pkg;
import javax.jws.WebParam;
import javax.jws.WebService;
import javax.xml.ws.Endpoint;
import java.util.Date;
@WebService
interface IService {
void hello(String username);
}
@WebService(targetNamespace = "ServiceImpl", endpointInterface="your.pkg.IService")
class ServiceImp implements IService{
public void hello(@WebParam(name = "username") String username) {
System.out.println("hello " + username + " now is " + new Date());
}
}
public class ServiceMain {
public static void main(String[] args) {
String address = "http://localhost:7777/myService";
Endpoint.publish(address, new ServiceImp());
System.out.println("OK");
}
}
我能够使用这两种方法运行它,并开始从端点获取 WSDL:- http://localhost:7777/myService?wsdl
关于java示例Web服务以 "java.lang.NullPointerException"启动,如何修复?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/53943701/