Not able to parse JSON without double quotes in Java using FasterXML Jackson

Question

Here is my RAW Json data : {ht_missingConditions=null, employeeNumber=UMB1075962, firstName=Pete}

Note: there is no double quotes

My Java Class

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonInclude;

@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonIgnoreProperties(ignoreUnknown = true)
public class MBIdClass {

    private String ht_missingConditions; 
    private String name; 
    private String employeeNumber; 

//All setter getters
}

My Utility to convert JSON

public static Map<String,String> test(String json) {
        ObjectMapper om=new ObjectMapper();
        om.configure(com.fasterxml.jackson.core.JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
        om.configure(com.fasterxml.jackson.core.JsonParser.Feature.AUTO_CLOSE_SOURCE, true);
        try {
            return om.readValue(json, new TypeReference<HashMap<String,String>>(){});
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

Earlier I tried with passing Generic class but now I am trying at least it parse and convert into HashMap.

I am calling using below ways

Map<String, String> testObj = test(sanitizedcleanData);

I am ending up below error:

com.fasterxml.jackson.core.JsonParseException: Unrecognized token 'UMB1075962': was expecting ('true', 'false' or 'null')
 at [Source: (String)"{ht_missingConditions:null, employeeNumber:UMB1075962, firstName:Pete  st"[truncated 1569 chars]; line: 1, column: 54]
    at com.fasterxml.jackson.core.JsonParser._constructError(JsonParser.java:1804)
    at com.fasterxml.jackson.core.base.ParserMinimalBase._reportError(ParserMinimalBase.java:703)
    at com.fasterxml.jackson.core.json.ReaderBasedJsonParser._reportInvalidToken(ReaderBasedJsonParser.java:2853)
    at com.fasterxml.jackson.core.json.ReaderBasedJsonParser._handleOddValue(ReaderBasedJsonParser.java:1899)
    at com.fasterxml.jackson.core.json.ReaderBasedJsonParser.nextFieldName(ReaderBasedJsonParser.java:968)
    at com.fasterxml.jackson.databind.deser.std.MapDeserializer._readAndBindStringKeyMap(MapDeserializer.java:512)
    at com.fasterxml.jackson.databind.deser.std.MapDeserializer.deserialize(MapDeserializer.java:364)
    at com.fasterxml.jackson.databind.deser.std.MapDeserializer.deserialize(MapDeserializer.java:29)
    at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4013)
    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3023)
    at com.devsoftbd.palash.studentsinfo.utils.CommonUtils.test(CommonUtils.java:80)
    at com.devsoftbd.palash.studentsinfo.StudentsInfoApplication.lambda$0(StudentsInfoApplication.java:55)
    at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:813)
    at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:797)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:324)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248)
    at com.devsoftbd.palash.studentsinfo.StudentsInfoApplication.main(StudentsInfoApplication.java:21)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)

I have tried to replace = with : but still no luck I was referring below article : StackOverflow-Issue

Answer 1

The form of your JSON string is invalid, it looks more like Properies class in Java.

Therefore, you can transform your invalid JSON string by replacing some characters to meet the format of .properties file, and then use Properties to read it as follows:

String inputStr = "{ht_missingConditions=null, employeeNumber=UMB1075962, firstName=Pete}";

inputStr = inputStr.replace("{", "").replace("}", "").replace(",", "\r\n");

Properties properties = new Properties();
properties.load(new ByteArrayInputStream(inputStr.getBytes(StandardCharsets.UTF_8)));
System.out.println(properties.toString()); // {ht_missingConditions=null, firstName=Pete, employeeNumber=UMB1075962}

Or you can also convert it to a Map and get similar result:

Map<String, String> propMap = properties.entrySet().stream()
        .collect(Collectors.toMap(
                e -> String.valueOf(e.getKey()),
                e -> String.valueOf(e.getValue()),
                (prev, next) -> next, HashMap::new
        ));
System.out.println(propMap.toString()); // {firstName=Pete, ht_missingConditions=null, employeeNumber=UMB1075962}