use kotlinx serialization

build.gradle.kts

@@ -1,9 +1,20 @@
 plugins {
     application
     kotlin("jvm") version "1.5.10"
+    kotlin("plugin.serialization") version "1.5.10"
     id("com.github.johnrengelman.shadow") version "7.0.0"
 }
 
+buildscript {
+    repositories { mavenCentral() }
+
+    dependencies {
+        val kotlinVersion = "1.5.10"
+        classpath(kotlin("gradle-plugin", version = kotlinVersion))
+        classpath(kotlin("serialization", version = kotlinVersion))
+    }
+}
+
 application {
     mainClassName = "MainKt"
 }
@@ -20,13 +31,14 @@ dependencies {
     implementation("com.rabbitmq:amqp-client:5.13.0")
     implementation("com.viartemev:the-white-rabbit:0.0.6")
     implementation("com.zaxxer:HikariCP:5.0.0")
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.2.2")
+    implementation("org.jetbrains.kotlinx:kotlinx-datetime:0.2.1")
     implementation("org.jetbrains.exposed:exposed-core:0.33.1")
     implementation("org.jetbrains.exposed:exposed-dao:0.33.1")
     implementation("org.jetbrains.exposed:exposed-jdbc:0.33.1")
     implementation("org.jetbrains.exposed:exposed-java-time:0.33.1")
     implementation("io.insert-koin:koin-core:3.1.2")
     implementation("org.postgresql:postgresql:42.2.23")
-    implementation("com.google.code.gson:gson:2.8.7")
 }
 
 tasks {

src/main/kotlin/api/ApiObject.kt

@@ -1,8 +1,9 @@
 package api
 
-import com.google.gson.annotations.SerializedName
+import kotlinx.serialization.Serializable
 
+@Serializable
 data class ApiObject(
-    @SerializedName("tag") val tag: String,
-    @SerializedName("probability") val probability: Double
+    val tag: String,
+    val probability: Double
 )

src/main/kotlin/database/dao/ResultObjects.kt

@@ -2,12 +2,12 @@ package database.dao
 
 import org.jetbrains.exposed.dao.id.IntIdTable
 import org.jetbrains.exposed.sql.*
-import org.jetbrains.exposed.sql.`java-time`.date
-import java.time.LocalDate
+import org.jetbrains.exposed.sql.`java-time`.datetime
+import java.time.LocalDateTime
 
 object ResultObjects : IntIdTable() {
     val tag: Column<String> = varchar("tag", 32)
-    val date: Column<LocalDate> = date("date").default(LocalDate.now())
+    val date: Column<LocalDateTime> = datetime("date").default(LocalDateTime.now())
     val probability: Column<Double> = double("probability")
     override val primaryKey = PrimaryKey(id, name = "PK_ResultObject_Id")
 }

src/main/kotlin/database/service/ResultObjectService.kt

@@ -1,14 +1,8 @@
 package database.service
 
-import database.DatabaseFactory.dbQuery
 import database.model.ResultObject
-import database.dao.ResultObjects
 import api.ApiObject
-import org.jetbrains.exposed.sql.ResultRow
-import org.jetbrains.exposed.sql.select
-import org.jetbrains.exposed.sql.selectAll
 import org.jetbrains.exposed.sql.transactions.transaction
-import java.time.LocalDate
 
 class ResultObjectService : IResultObjectService {
 

src/main/kotlin/mq/DatabaseConsumer.kt

@@ -1,15 +1,15 @@
 package mq
 
 import api.ApiObject
-import com.google.gson.Gson
 import com.rabbitmq.client.*
 import database.service.IResultObjectService
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.json.Json
 import org.koin.core.component.KoinComponent
 import org.koin.core.component.inject
 
 class DatabaseConsumer(channel: Channel): Consumer, KoinComponent {
     private val resultObjectService : IResultObjectService by inject()
-    private val gson = Gson()
     private val basicChannel = channel
     override fun handleConsumeOk(consumerTag : String?) {
     }
@@ -30,7 +30,7 @@ class DatabaseConsumer(channel: Channel): Consumer, KoinComponent {
     override fun handleDelivery(consumerTag : String?, envelope : Envelope?, basicProperties : AMQP.BasicProperties?, body : ByteArray?) {
         try {
             val rawJson = body!!.toString(Charsets.UTF_8)
-            val apiObject = gson.fromJson(rawJson, ApiObject::class.java)
+            val apiObject = Json.decodeFromString<ApiObject>(rawJson)
             resultObjectService.addOne(apiObject)
             basicChannel.basicAck(envelope!!.deliveryTag, false)
         } catch (e: Exception) {