未找到类型为返回值的转换器：class com.spring.mvc.model.User]

例外情况如下： SEVERE：servlet [hello]中的Servlet.service（）与path [/ Spring_MVC]的上下文引发异常[请求处理失败;嵌套异常是java.lang.IllegalArgumentException：没有找到具有根本原因的类型为：com.spring.mvc.model.User类的返回值的转换器 java.lang.IllegalArgumentException：找不到类型为：class com的返回值的转换器.spring.mvc.model.User未找到类型为返回值的转换器：class com.spring.mvc.model.User]

源代码都低于： UserController.java

@Controller 
@RequestMapping("/user") 
public class UserController { 

    private Map<String,User> users = new HashMap <String, User>(); 

    public UserController(){ 
     users.put("wang", new User("wang","pwang","wang a bo","123")); 
     users.put("chen", new User("chen","pChen","Chen Lin","1e23")); 
    } 

    @RequestMapping(value="{userName}",method=RequestMethod.GET, params="json") 
    @ResponseBody 
    public User show(@PathVariable String userName) { 
     return users.get(userName); 
    } 
}

User.java

public class User { 

    @NotEmpty(message="User Name not null!!!") 
    private String userName; 

    @Size(min=6,max=12,message="Password need 6 to 12 Character!!!") 
    private String passWord; 

    private String nickName; 

    @Email(message="Email Fromat invalide!!") 
    private String email; 

    public User(){ 

    } 

    public User(String userName, String passWord, String nickName, String email) { 
     super(); 
     this.userName = userName; 
     this.passWord = passWord; 
     this.nickName = nickName; 
     this.email = email; 
    } 


    public String getUserName() { 
     return userName; 
    } 

    public void setUserName(String userName) { 
     this.userName = userName; 
    } 


    public String getPassWord() { 
     return passWord; 
    } 

    public void setPassWord(String passWord) { 
     this.passWord = passWord; 
    } 

    public String getNickName() { 
     return nickName; 
    } 

    public void setNickName(String nickName) { 
     this.nickName = nickName; 
    } 


    public String getEmail() { 
     return email; 
    } 

    public void setEmail(String email) { 
     this.email = email; 
    } 

}

弹簧4.3.5释放同时杰克逊 - 清一色1.9.4 .jar

来源

2017-05-04 Lin Chen

我用下面罐子代替同时杰克逊 - 全1.9.4.jar。此问题已得到解决。 –

我用下面的罐子来替换jar jackon-all-1.9.4.jar。这个问题已经解决。杰克逊 - 数据绑定-2.5.0.jar 杰克逊核心2.5.0.jar 杰克逊的注解-2.5.0.jar

来源

2017-05-04 09:50:19

com \ fasterxml \ jackson \ core \ util \ DefaultIndenter.class是2.5之后的新增类。请不要这样。 –

未找到类型为返回值的转换器：class com.spring.mvc.model.User]

回答

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