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我的第一个 Spring WS 项目有问题。我想使用 spring ws 来分离 GUI 和 DAO。因为那根本不起作用，所以首先我想在一个项目中实现 WS。我目前的问题是我得到了例外：

Caused by: org.springframework.web.client.ResourceAccessException: I/O error on GET request for "http://localhost:8443/shadowrun/user/Markus2/test":Unexpected end of file from server; nested exception is java.net.SocketException: Unexpected end of file from server
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:503)
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:452)
at org.springframework.web.client.RestTemplate.getForObject(RestTemplate.java:222)
at at.itn.shadowrun.gui.service.client.UserClient.findUser(UserClient.java:26)

这是来自UserClient.java的部分：

@Component("userClient")
public class UserClient extends GenericClient {

@Autowired
public UserClient(RestTemplate restTemplate) {
    this.restTemplate = restTemplate;
}

public SUsers findUser(String user, String password) {
    return restTemplate.getForObject(serviceUrl + "user/{user}/{password}", SUsers.class, user, password);
}
// etc
}

最后是加载UserClient.java的SignInSession.java：

public final class SignInSession extends AuthenticatedWebSession {
@Autowired
private UserClient userClient = new UserClient(new RestTemplate());

@Override
public final boolean authenticate(final String username, final String password) {
currentUser = userClient.findUser(username, password);
// etc
}
}

到目前为止我的想法：我发现我必须编写private UserClient userClient = new UserClient(new RestTemplate());来防止 NullPointerException 有点令人困惑，但在所有教程中我发现它总是只声明@Autowired private UserClient userClient.

谁能给我一些指导和/或一些关于此的推荐文档？谢谢！

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