JPA criteria builder equal method is not working as expected - spring-boot

Question

In my case I'm trying to fetch some data by extracting a value from a json column in db. My code is as follows,
criteriaBuilder.equal(criteriaBuilder.function("JSON_EXTRACT", Boolean.class, root.get("result"), criteriaBuilder.literal("$.matched")), false);
Above code gives me an empty set of data. Also this is working fine in query console.
But,
criteriaBuilder.between(criteriaBuilder.function("JSON_EXTRACT", Double.class, root.get("result"), criteriaBuilder.literal("$.streaming_threshold")), 0.1, 0.9);
this between method is working fine. What could be the mistake here?
UPDATE
Boolean values are the values that I couldn't read. NOT INTEGERS. My JSON structure,
{
"status": "SUCCESS",
"request_id": "request_id",
"time_taken": 8454,
"matched": false,
"streaming_threshold": 0.5
}

Answer 1

I was not able to get it working with the raw boolean field. I converted the Boolean property on the object to String and vice-versa using #JsonSerialize and #JsonDeserialize and then persisted that as json and followed the same approach you did but now searching String.class as false instead of Boolean. My solution is as below:
Entity
#Entity
#Table(name = "json_container")
public class JsonContainer {
#Id
#GeneratedValue
#Type(type = "uuid-char")
private UUID id;
#Column(columnDefinition = "json", name = "json_data")
private String jsonData;
public UUID getId() {
return id;
}
public String getJsonData() {
return jsonData;
}
public void setJsonData(String jsonData) {
this.jsonData = jsonData;
}
public static class SampleDetails {
private String status;
private String requestId;
private Integer timeTaken;
#JsonSerialize(using = StringBooleanJsonSerializer.class)
#JsonDeserialize(using = StringBooleanJsonDeserializer.class)
private Boolean matched;
private Double streamingThreshold;
public SampleDetails() {
}
public SampleDetails(String status, String requestId, Integer timeTaken, Boolean matched, Double streamingThreshold) {
this.status = status;
this.requestId = requestId;
this.timeTaken = timeTaken;
this.matched = matched;
this.streamingThreshold = streamingThreshold;
}
public String getStatus() {
return status;
}
public String getRequestId() {
return requestId;
}
public Integer getTimeTaken() {
return timeTaken;
}
public Double getStreamingThreshold() {
return streamingThreshold;
}
public Boolean getMatched() {
return matched;
}
static class StringBooleanJsonSerializer extends JsonSerializer<Boolean> {
#Override
public void serialize(Boolean value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
gen.writeString(value != null && value ? value.toString() : "false");
}
}
static class StringBooleanJsonDeserializer extends JsonDeserializer<Boolean> {
#Override
public Boolean deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JsonProcessingException {
try {
return Boolean.parseBoolean(p.getText());
} catch (RuntimeException e) {
return Boolean.FALSE;
}
}
}
}
Test Class
class MySQLJsonConverterTest {
#Autowired
private EntityManager entityManager;
#Rollback(false)
#Test
void testCustomJsonConverter() throws JsonProcessingException {
JsonContainer jsonContainer = new JsonContainer();
jsonContainer.setJsonData(
getAsJson(new JsonContainer.SampleDetails("success", "12344567", 8454, false, 0.1)));
entityManager.persist(jsonContainer);
Assertions.assertNotNull(jsonContainer.getId());
jsonContainer = new JsonContainer();
jsonContainer.setJsonData(
getAsJson(new JsonContainer.SampleDetails("success", "8989", 121, true, 0.5)));
entityManager.persist(jsonContainer);
Assertions.assertNotNull(jsonContainer.getId());
CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder();
CriteriaQuery<JsonContainer> criteriaQuery = criteriaBuilder.createQuery(JsonContainer.class);
Root<JsonContainer> from = criteriaQuery.from(JsonContainer.class);
criteriaQuery.where(criteriaBuilder.equal(criteriaBuilder.function("JSON_EXTRACT", String.class, from.get("jsonData"),
criteriaBuilder.literal("$.matched")), "false"));
TypedQuery<JsonContainer> typedQuery = entityManager.createQuery(criteriaQuery);
List<JsonContainer> resultList = typedQuery.getResultList();
Assertions.assertEquals(1, resultList.size());
}
private String getAsJson(JsonContainer.SampleDetails sampleDetails) throws JsonProcessingException {
//var created so debugging is ez
String json = new ObjectMapper().writeValueAsString(sampleDetails);
return json;
}
}

Answer 2

Default JPA convert boolean to 0/1, so if serialize boolean to 0/1 into database, the equal query will be ok.