无法反序列化的java.util.ArrayList实例出来VALUE_STRING的 [英] Can not deserialize instance of java.util.ArrayList out of VALUE_STRING
问题描述
我有泽西构建和部署在AppEngine上REST服务。其余的服务实现了动词PUT消耗的应用程序/ json的媒体类型。数据绑定是由杰克逊进行的。
动词消耗了企业部门的关系再在JSON psented $ P $为
{名:MYENTERPRISE,部门:HR,IT,SC]}
在客户端,我用GSON到JSON重新presentation转换为Java对象。然后,我的对象传递给我的REST服务,它工作正常。
问题:
当我重新JSON presentation具有集合中只有一个项目
{名:MYENTERPRISE,部门:HR]}
该服务无法反序列化对象。
注意:/企业/企业:组织codehaus.jackson.map.JsonMappingException:
在无法反序列化的java.util.ArrayList实例出来VALUE_STRING令牌
[来源:org.mortbay.jetty.HttpParser$Input@5a9c5842;行:1,列:2
据报道由其他用户,解决的办法是添加标志ACCEPT_SINGLE_VALUE_AS_ARRAY(例如,<一href=\"http://stackoverflow.com/questions/14319573/jersey-can-not-deserialize-instance-of-arraylist-out-of-string\">Jersey:无法反序列化ArrayList的实例,从字符串的)。然而,由于在服务方面,它都将透明的杰克逊做我不是一个控制ObjectMapper。
问:
有没有在服务端配置ObjectMapper使ACCEPT_SINGLE_VALUE_AS_ARRAY的方法吗?注解? web.xml中?
code详情
Java对象:
@XmlRootElement
公共类企业{
私人字符串名称;
私人列表&LT;串GT;部门; 公共企业(){} 公共字符串的getName(){
返回名称;
}
公共无效setname可以(字符串名称){
this.name =名称;
}
公开名单&LT;串GT; getDepartments(){
返回部门;
}
公共无效setDepartments(列表&LT;串GT;部门){
this.departments =部门;
}
}
REST服务端:
@PUT
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
@Path(/企业)
市民反应putEnterprise(企业企业,
@Context HttpServletRequest的REQ){
...
}
客户端:
...
字符串jsonString ={\\名称\\:\\MYENTERPRISE \\,\\部门\\:[\\HR \\]};
企业企业= gson.fromJson(jsonString,Enterprise.class);
的System.out.println(gson.toJson(企业));
响应= webResource
.TYPE(MediaType.APPLICATION_JSON)
。把(ClientResponse.class,企业);
如果(response.getStatus()&GT; = 400){
抛出新的RuntimeException(失败:HTTP错误code:+ response.getStatus());
}
...
这是我的老问题解决方案:
我实现我自己的ContextResolver为了使DeserializationConfig.Feature.ACCEPT_SINGLE_VALUE_AS_ARRAY功能。
包org.lig.hadas.services.mapper;进口javax.ws.rs.Produces;
进口javax.ws.rs.core.MediaType;
进口javax.ws.rs.ext.ContextResolver;
进口javax.ws.rs.ext.Provider;。进口组织codehaus.jackson.map.DeserializationConfig;
。进口组织codehaus.jackson.map.ObjectMapper;@Produces(MediaType.APPLICATION_JSON)
@Provider
公共类ObjectMapperProvider实现ContextResolver&LT; ObjectMapper&GT;
{
ObjectMapper映射; 公共ObjectMapperProvider(){
映射器=新ObjectMapper();
mapper.configure(DeserializationConfig.Feature.ACCEPT_SINGLE_VALUE_AS_ARRAY,真);
}
@覆盖
公共ObjectMapper的getContext(类&LT;&GT;类型){
返回映射器;
}
}
和在web.xml我注册了我的包入servlet定义...
&LT;&servlet的GT;
&LT; servlet的名称&gt; ...&LT; / servlet的名称&gt;
&LT;的servlet类&GT; com.sun.jersey.spi.container.servlet.ServletContainer&LT; / servlet的类&GT;
&LT;初始化参数&GT;
&LT;参数-名称&gt;&com.sun.jersey.config.property.packages LT; /参数 - 名称&gt;
&LT;参数值&GT; ...; org.lig.hadas.services.mapper&LT; /参数值&GT;
&LT; /初始化参数&GT;
...
&LT; / servlet的&GT;
...其余全部是透明球衣/杰克逊完成。
I have a REST service built with Jersey and deployed in the AppEngine. The REST service implements the verb PUT that consumes an application/json media type. The data binding is performed by Jackson.
The verb consumes an enterprise-departments relation represented in JSON as
{"name":"myEnterprise", "departments":["HR","IT","SC"]}
In the client side, I use gson to convert the JSON representation into a java object. Then, I pass the object to my REST service and it works fine.
Problem:
When my JSON representation has only one item in the collection
{"name":"myEnterprise", "departments":["HR"]}
the service cannot deserialize the object.
ATTENTION: /enterprise/enterprise: org.codehaus.jackson.map.JsonMappingException:
Can not deserialize instance of java.util.ArrayList out of VALUE_STRING token at
[Source: org.mortbay.jetty.HttpParser$Input@5a9c5842; line: 1, column: 2
As reported by other users, the solution is to add the flag ACCEPT_SINGLE_VALUE_AS_ARRAY (e.g., Jersey: Can not deserialize instance of ArrayList out of String). Nevertheless, I am not controlling an ObjectMapper because in the service side it is transparently made by Jackson.
Question:
Is there a way to configure the ObjectMapper on the service side to enable ACCEPT_SINGLE_VALUE_AS_ARRAY? annotations? web.xml?
Code details
Java object:
@XmlRootElement
public class Enterprise {
private String name;
private List<String> departments;
public Enterprise() {}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<String> getDepartments() {
return departments;
}
public void setDepartments(List<String> departments) {
this.departments = departments;
}
}
The REST service side:
@PUT
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
@Path("/enterprise")
public Response putEnterprise(Enterprise enterprise,
@Context HttpServletRequest req){
...
}
Client side:
...
String jsonString = "{\"name\":\"myEnterprise\", \"departments\":[\"HR\"]}";
Enterprise enterprise = gson.fromJson(jsonString, Enterprise.class);
System.out.println(gson.toJson(enterprise));
response = webResource
.type(MediaType.APPLICATION_JSON)
.put(ClientResponse.class,enterprise);
if (response.getStatus() >= 400) {
throw new RuntimeException("Failed : HTTP error code : " + response.getStatus());
}
...
This is the solution for my old question:
I implemented my own ContextResolver in order to enable the DeserializationConfig.Feature.ACCEPT_SINGLE_VALUE_AS_ARRAY feature.
package org.lig.hadas.services.mapper;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.ext.ContextResolver;
import javax.ws.rs.ext.Provider;
import org.codehaus.jackson.map.DeserializationConfig;
import org.codehaus.jackson.map.ObjectMapper;
@Produces(MediaType.APPLICATION_JSON)
@Provider
public class ObjectMapperProvider implements ContextResolver<ObjectMapper>
{
ObjectMapper mapper;
public ObjectMapperProvider(){
mapper = new ObjectMapper();
mapper.configure(DeserializationConfig.Feature.ACCEPT_SINGLE_VALUE_AS_ARRAY, true);
}
@Override
public ObjectMapper getContext(Class<?> type) {
return mapper;
}
}
And in the web.xml I registered my package into the servlet definition...
<servlet>
<servlet-name>...</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>...;org.lig.hadas.services.mapper</param-value>
</init-param>
...
</servlet>
... all the rest is transparently done by jersey/jackson.
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