好的，我有一个包含两个 RESTful Web 服务类 Login.class 和 Subscribe.class 的包。当我将它们部署到应用程序引擎并对其进行测试时，它们可以正常工作。现在，我将一个新的服务类名称 User s.class 添加到包中，现在当我调用它们时，我的服务都不起作用，我收到内部服务器错误。
com.sun.jersey.spi.inject.Errors processErrorMessages: The following errors and warnings have been detected with resource and/or provider classes:
严重：产生媒体类型冲突。资源方法 public javax.ws.rs.core.Response com.ppsjamaica.webservices.PPSUsers.getUserById(java.lang.Long) 和 public javax.ws.rs.core.Response com.ppsjamaica.webservices.PPSUsers.getUserByUsernamePassword( java.lang.String,java.lang.String) 可以产生相同的媒体类型
Uncaught exception from servlet
com.sun.jersey.spi.inject.Errors.processErrorMessages (Errors.java:170) 处的 com.sun.jersey.spi.inject.Errors$ErrorMessagesException
我的订阅课程是：
@Path ("/subscriber")
public class Subscribe {
@GET
@Produces (MediaType.APPLICATION_JSON)
public Response getSubscriber (@QueryParam("email")String email)
{
EntityManager entityManager = EMF.getInstance ().createEntityManager ();
/*
* Sends back a BAD_REQUEST HTTP status
* if email query parameter is empty
*/
if (email.isEmpty ())
return Response.status(Status.BAD_REQUEST).build ();
try
{
Query query = entityManager.createQuery ("SELECT FROM Subscriber WHERE email= :emailParam");
query.setParameter("emailParam", email);
return Response.status(Status.OK).entity((Subscriber) query.getSingleResult ()).build ();
}
catch (NoResultException e)
{
return Response.status (Status.NOT_FOUND).build ();
}
}//end Subscriber method
}
我的登录类是：
@Path ("/login")
public class Login {
@GET
@Produces (MediaType.APPLICATION_JSON)
public User authenticate (@QueryParam("username") String username, @QueryParam("password")String password)
{
User user = new User ();
return user;
}//end authenticate method
@GET
@Path ("/Subscriber")
@Produces (MediaType.APPLICATION_JSON)
public Response getSubsriber (@QueryParam("email") String email)
{
EntityManager entityManager = EMF.getInstance ().createEntityManager();
try
{
Query query = entityManager.createQuery("SELECT FROM Subscriber WHERE email= :emailParam");
query.setParameter("emailParam", email);
Subscriber subscriber = (Subscriber)query.getSingleResult();
return Response.status(Status.OK).entity(subscriber).build ();
}
catch(Exception e)
{
throw new RuntimeException (e);
}
}//end getSubsriber method
}//end Login class
我的用户类是：
@Path ("/users")
public class Users {
/**
* Gets all User objects from datastore. Returns
* NOT_FOUND HTTP Response status if no result
* found and OK HTTP Response status if it does with
* a list of User objects.
*
* URL: domain-name/services/users/all
*
* @author Mario Dennis
* @return Response
*/
@GET
@Path ("/all")
@Produces(MediaType.APPLICATION_JSON)
public Response getAllUsers ()
{
try
{
EntityManager entityManager = EMF.getInstance().createEntityManager();
Query query = entityManager.createQuery("SELECT FROM User");
@SuppressWarnings("unchecked")
List<User> user = (List<User>) query.getSingleResult ();
GenericEntity<List<User>> entity = new GenericEntity<List<User>>(user){};
return Response.status(Status.OK).entity(entity).build ();
}
catch (NoResultException e)
{
return Response.status(Status.NOT_FOUND).build ();
}
}//end getAllUsers method
/**
* Gets User object with user name and password specified from
* datastore. Returns NOT_FOUND HTTP Response status if no result
* found and OK HTTP Response status if it is found and BAD_REQUEST
* if parameter supplied is empty.
* a list of User objects.
*
* URL: domain-name/services/users/{username}&{password}
*
* @author Mario Dennis
* @return Response
*/
@GET
@Produces (MediaType.APPLICATION_JSON)
public Response getUserByUsernamePassword (@QueryParam("username")String username,@QueryParam("password") String password)
{
/*
* Sends back a BAD_REQUEST HTTP status
* if email query parameter is empty
*/
if (username.isEmpty() || password.isEmpty())
return Response.status(Status.BAD_REQUEST).build ();
try
{
EntityManager entityManager = EMF.getInstance().createEntityManager ();
Query query = entityManager.createQuery ("SELECT FROM User WHERE user_name= :usernameParam AND password= :passwordParam");
query.setParameter("usernameParam", username);
query.setParameter("passwordParam",password);
User user = (User) query.getSingleResult ();
return Response.status(Status.OK).entity(user).build ();
}
catch (NoResultException e)
{
return Response.status(Status.NOT_FOUND).build ();
}
}//end getUserByUsernamePassword method
/**
* Gets User object with id specified from datastore.
* Returns NOT_FOUND HTTP Response status if no result
* found and OK HTTP Response status if it is found and
* BAD_REQUEST if parameter supplied is empty.
* a list of User objects.
*
* URL: domain-name/services/users/{id}
*
* @author Mario Dennis
* @return Response
*/
@GET
@Produces (MediaType.APPLICATION_JSON)
public Response getUserById (@QueryParam("id")Long id)
{
/*
* Sends back a BAD_REQUEST HTTP status
* if email query parameter is empty.
*/
if (id == null)
return Response.status(Status.BAD_REQUEST).build ();
try
{
EntityManager entityManager = EMF.getInstance ().createEntityManager ();
User user = entityManager.find(User.class,id);
/*
* Checks if user was found. Return a NOT_FOUND
* HTTP status if user was not located.
*/
if (user == null)
return Response.status(Status.NOT_FOUND).build ();
else
return Response.status(Status.OK).entity(user).build();
}
catch (NoResultException e)
{
return Response.status(Status.NOT_FOUND).build ();
}
}//end getUserById method
/**
* Save User object to database. Return NOT_MODIFIED
* HTTP status if persisting of object failed. Otherwise
* return OK HTTP status if it was successful.
*
* URL: domain-name/services/users/{JSON}
*
* @author Mario Dennis
* @param user
* @return Response
*/
@POST
@Consumes (MediaType.APPLICATION_JSON)
public Response saveUser (User user)
{
try
{
EntityManager entityManager = EMF.getInstance().createEntityManager();
entityManager.getTransaction ().begin();
entityManager.persist(user);
entityManager.getTransaction().commit();
return Response.status(Status.OK).build ();
}
catch(Exception e)
{
return Response.status(Status.NOT_MODIFIED).build ();
}
}//end saveUser method
}//end Users class
当我删除用户类并上传回来时，其他两个服务又开始工作了。这是什么原因造成的？web.xml
<!-- Jersey Framework mapping -->
<servlet>
<servlet-name>RESTful</servlet-name>
<servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>com.sun.jersey.config.property.packages</param-name>
<param-value>com.ppsjamaica.webservices</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>RESTful</servlet-name>
<url-pattern>/service/*</url-pattern>
</servlet-mapping>
<!-- end Jersey Framework mapping -->