Java 使用异常映射器的 JAX-RS
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JAX-RS using exception mappers
提问by Jordan Allan
I have read that I can create an implementation of javax.ws.rs.ext.ExceptionMapperthat will map a thrown application exception to a Responseobject.
我已经读到我可以创建一个实现javax.ws.rs.ext.ExceptionMapper，将抛出的应用程序异常映射到一个Response对象。
I've created a simple example which throws an exception if the phone length is greater than 20 characters when persisting the object. I am expecting the exception to be mapped to an HTTP 400 (Bad Request) response; however, I am receiving an HTTP 500 (Internal Server Error) with the following exception:
我创建了一个简单的示例，如果在持久化对象时电话长度大于 20 个字符，则会引发异常。我期望将异常映射到 HTTP 400（错误请求）响应；但是，我收到 HTTP 500（内部服务器错误），但有以下异常：
java.lang.ClassCastException: com.example.exception.InvalidDataException cannot be cast to java.lang.Error
What am I missing? Any advice is greatly appreciated.
我错过了什么？任何意见是极大的赞赏。
Exception mapper:
异常映射器：
@Provider
public class InvalidDataMapper implements ExceptionMapper<InvalidDataException> {
@Override
public Response toResponse(InvalidDataException arg0) {
return Response.status(Response.Status.BAD_REQUEST).build();
}
}
Exception class:
异常类：
public class InvalidDataException extends Exception {
private static final long serialVersionUID = 1L;
public InvalidDataException(String message) {
super(message);
}
...
}
Entity class:
实体类：
@Entity
@Table(name="PERSON")
@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement
public class Person {
@Id @GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name="ID")
private Long id;
@Column(name="NAME")
private String name;
@Column(name="PHONE")
private String phone;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
@PrePersist
public void validate() throws InvalidDataException {
if (phone != null) {
if (phone.length() > 20) {
throw new InvalidDataException("Phone number too long: " + phone);
}
}
}
}
Service:
服务：
@Path("persons/")
@Produces(MediaType.APPLICATION_XML)
@Consumes(MediaType.APPLICATION_XML)
@Stateless
public class PersonResource {
@Context
private UriInfo uriInfo;
@PersistenceContext(name="simple")
private EntityManager em;
@POST
public Response createPerson(JAXBElement<Person> personJaxb) {
Person person = personJaxb.getValue();
em.persist(person);
em.flush();
URI personUri = uriInfo.getAbsolutePathBuilder().
path(person.getId().toString()).build();
return Response.created(personUri).build();
}
}
采纳答案by bdoughan
Is InvalidDataException getting wrapped in a PersistenceException? Maybe you could do something like the following:
InvalidDataException 是否包含在 PersistenceException 中？也许您可以执行以下操作：
@Provider
public class PersistenceMapper implements ExceptionMapper<PersistenceException> {
@Override
public Response toResponse(PersistenceException arg0) {
if(arg0.getCause() instanceof InvalidDataException) {
return Response.status(Response.Status.BAD_REQUEST).build();
} else {
...
}
}
}
回答by Ashish
Cross check you web.xml you need to register your "PersistenceMapper" class also along with the services.
交叉检查您的 web.xml，您还需要将“PersistenceMapper”类与服务一起注册。
