diff --git a/buildSrc/plugins/src/main/groovy/org/jetbrains/kotlin/Reporter.groovy b/buildSrc/plugins/src/main/groovy/org/jetbrains/kotlin/Reporter.groovy
deleted file mode 100644
index 60f0f905d02..00000000000
--- a/buildSrc/plugins/src/main/groovy/org/jetbrains/kotlin/Reporter.groovy
+++ /dev/null
@@ -1,81 +0,0 @@
-/*
- * Copyright 2010-2017 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.jetbrains.kotlin
-
-import com.ullink.slack.simpleslackapi.impl.SlackSessionFactory
-import groovy.json.JsonSlurper
-import org.gradle.api.DefaultTask
-import org.gradle.api.tasks.TaskAction
-
-/**
- * Created by minamoto on 2/7/17.
- */
-class Reporter extends DefaultTask {
-
-    private String buildLogUrlTab(String buildId, String buildTypeId) {
-        return tabUrl(buildId, buildTypeId, "buildLog")
-    }
-
-    private String tabUrl(String buildId, String buildTypeId, tab) {
-        return "http://buildserver.labs.intellij.net/viewLog.html?buildId=${buildId}&buildTypeId=${buildTypeId}&tab=${tab}"
-    }
-
-    private String testReportUrl(String buildId, String buildTypeId) {
-        return tabUrl(buildId, buildTypeId,"testsInfo")
-    }
-
-    def reportHome
-
-    @TaskAction
-    void report() {
-        def teamcityConfig = System.getenv("TEAMCITY_BUILD_PROPERTIES_FILE")
-        if (teamcityConfig == null)
-            throw new RuntimeException("Can't load teamcity config")
-
-        def buildProperties = new Properties()
-        buildProperties.load(new FileInputStream(teamcityConfig))
-        def buildId = buildProperties.'teamcity.build.id'
-        def buildTypeId = buildProperties.'teamcity.buildType.id'
-        def logUrl = buildLogUrlTab(buildId, buildTypeId)
-        def testReportUrl = testReportUrl(buildId, buildTypeId)
-        def epilogue = "\nlog url: $logUrl\ntest report url: $testReportUrl"
-
-        def stats = new RunExternalTestGroup.Statistics()
-        def resultsFile = new File(reportHome, "external/results.json")
-        def report
-
-        if (resultsFile.exists()) {
-            def obj = new JsonSlurper().parse(resultsFile)
-            stats.total = obj.statistics.total
-            stats.passed = obj.statistics.passed
-            stats.failed = obj.statistics.failed
-            stats.error = obj.statistics.error
-            stats.skipped = obj.statistics.skipped
-            report = "total: ${stats.total}\npassed: ${stats.passed}\nfailed: ${stats.failed}\n" +
-                    "error:${stats.error}\nskipped:${stats.skipped} ${epilogue}"
-        } else {
-            report = "Unable to get results\nBuild has probably failed${epilogue}"
-        }
-        println(report)
-        def session = new SlackSessionFactory().createWebSocketSlackSession(buildProperties.'konan-reporter-token')
-        session.connect()
-        def channel = session.findChannelByName(buildProperties.'konan-channel-name')
-        session.sendMessage(channel, "Hello, аборигены Котлина!\n текущий статус:\n${report}")
-        session.disconnect()
-    }
-
-}
diff --git a/buildSrc/plugins/src/main/kotlin/org/jetbrains/kotlin/Reporter.kt b/buildSrc/plugins/src/main/kotlin/org/jetbrains/kotlin/Reporter.kt
new file mode 100644
index 00000000000..e32e910e548
--- /dev/null
+++ b/buildSrc/plugins/src/main/kotlin/org/jetbrains/kotlin/Reporter.kt
@@ -0,0 +1,74 @@
+/*
+ * Copyright 2010-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the LICENSE file.
+ */
+
+package org.jetbrains.kotlin
+
+import com.ullink.slack.simpleslackapi.impl.SlackSessionFactory
+import groovy.json.JsonSlurper
+import org.gradle.api.DefaultTask
+import org.gradle.api.tasks.Input
+import org.gradle.api.tasks.TaskAction
+import java.io.File
+import java.io.FileInputStream
+import java.util.*
+
+open class Reporter : DefaultTask() {
+    private fun buildLogUrlTab(buildId: String, buildTypeId: String): String = tabUrl(buildId, buildTypeId, "buildLog")
+
+    private fun tabUrl(buildId: String, buildTypeId: String, tab: String): String =
+            "http://buildserver.labs.intellij.net/viewLog.html?buildId=$buildId&buildTypeId=$buildTypeId&tab=$tab"
+
+    private fun testReportUrl(buildId: String, buildTypeId: String): String = tabUrl(buildId, buildTypeId, "testsInfo")
+
+    @Input
+    lateinit var reportHome: String
+
+    @TaskAction
+    fun report() {
+        val teamcityConfig = System.getenv("TEAMCITY_BUILD_PROPERTIES_FILE")
+                ?: throw  RuntimeException("Can't load teamcity config")
+
+        val buildProperties = Properties()
+        buildProperties.load(FileInputStream(teamcityConfig))
+        val buildId = buildProperties.getProperty("teamcity.build.id")
+        val buildTypeId = buildProperties.getProperty("teamcity.buildType.id")
+        val logUrl = buildLogUrlTab(buildId, buildTypeId)
+        val testReportUrl = testReportUrl(buildId, buildTypeId)
+        var epilogue = "\nlog url: $logUrl\ntest report url: $testReportUrl"
+
+        val resultsFile = File(reportHome, "external/results.json")
+        val report: String = if (resultsFile.exists()) {
+            @Suppress("UNCHECKED_CAST")
+            val obj = JsonSlurper().parse(resultsFile) as? AbstractMap<String, Any>
+                    ?: throw IllegalStateException("Got incorrect JSON object: ${resultsFile.absolutePath}")
+            @Suppress("UNCHECKED_CAST")
+            val statsJSON = obj["statistics"] as? AbstractMap<String, Int>
+                    ?: throw IllegalStateException("Got incorrect statistics object in JSON:" +
+                            resultsFile.absolutePath)
+            val stats = Statistics(
+                    passed = statsJSON["passed"]!!,
+                    failed = statsJSON["failed"]!!,
+                    error = statsJSON["error"]!!,
+                    skipped = statsJSON["skipped"]!!)
+            val total = statsJSON["total"]!!
+            if (total != stats.total) {
+                val message = "WARNING: total amount of tests doesn't match with the sum of failed, passed, error & skipped"
+                println(message)
+                epilogue += message
+            }
+            "total: ${stats.total}\npassed: ${stats.passed}\nfailed: ${stats.failed}\n" +
+                    "error:${stats.error}\nskipped:${stats.skipped} $epilogue"
+        } else {
+            "Unable to get results\nBuild has probably failed$epilogue"
+        }
+        println(report)
+        with(SlackSessionFactory.createWebSocketSlackSession(buildProperties.getProperty("konan-reporter-token"))) {
+            connect()
+            sendMessage(findChannelByName(buildProperties.getProperty("konan-channel-name")),
+                    "Hello, аборигены Котлина!\n текущий статус:\n$report")
+            disconnect()
+        }
+    }
+}
\ No newline at end of file