albert's blog: Illegal unquoted character ((CTRL-CHAR, code 26)): has to be escaped using backslash to be included in string.

2017/12/04

Illegal unquoted character ((CTRL-CHAR, code 26)): has to be escaped using backslash to be included in string.

Problem
When I try to convert JSON string to Java bean via Jackson Framework, it throws an exception as bellows:

Illegal unquoted character ((CTRL-CHAR, code 26)): has to be escaped using backslash to be included in string.

The code snippet is:

package albert.practice.json;

import java.io.IOException;

import org.codehaus.jackson.JsonParser.Feature;
import org.codehaus.jackson.annotate.JsonProperty;
import org.codehaus.jackson.map.ObjectMapper;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.ToString;

public class JSONUtils {

    public Response convertJsonToObject(String json) throws IOException {
        ObjectMapper mapper = new ObjectMapper();
        Response response = null;
        try {
            response = mapper.readValue(json, Response.class);
        } catch (IOException e) {
            throw e;
        }
        return response;
    }

    @Data
    @ToString
    @NoArgsConstructor
    @AllArgsConstructor
    public static class Response {
        @JsonProperty("Type")
        private String type;
        @JsonProperty("Status")
        private String status;
    }
}

How-To
Owing to the JSON has some CTRL-CHAR, so Jackson Framework cannot covert to Java bean correctly.
You need to configure OjbectMapper to accept backslash escaping character. The updated code snippet looks like:

package albert.practice.json;

import java.io.IOException;

import org.codehaus.jackson.JsonParser.Feature;
import org.codehaus.jackson.annotate.JsonProperty;
import org.codehaus.jackson.map.ObjectMapper;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.ToString;

public class JSONUtils {

    public Response convertJsonToObject(String json) throws IOException {
        ObjectMapper mapper = new ObjectMapper();
        mapper.configure(Feature.ALLOW_BACKSLASH_ESCAPING_ANY_CHARACTER, true);
        Response response = null;
        try {
            response = mapper.readValue(json, Response.class);
        } catch (IOException e) {
            throw e;
        }
        return response;
    }

    @Data
    @ToString
    @NoArgsConstructor
    @AllArgsConstructor
    public static class Response {
        @JsonProperty("Type")
        private String type;
        @JsonProperty("Status")
        private String status;
    }
}

albert's blog

Total Pageviews

2017/12/04

Illegal unquoted character ((CTRL-CHAR, code 26)): has to be escaped using backslash to be included in string.

No comments: