Revert "Eagerly load CoroutineExceptionHandler and load corresponding…

… service (Kotlin#2957)" (Kotlin#3190)

This reverts commit 0b65246.

kotlinx-coroutines-core/common/src/CoroutineExceptionHandler.kt

@@ -1,19 +1,13 @@
 /*
  * Copyright 2016-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
  */
+
 package kotlinx.coroutines
 
 import kotlin.coroutines.*
-import kotlin.jvm.*
 
 internal expect fun handleCoroutineExceptionImpl(context: CoroutineContext, exception: Throwable)
 
-/**
- * JVM kludge: trigger loading of all the classes and service loading
- * **before** any exception occur because it may be OOM, SOE or VerifyError
- */
-internal expect fun initializeDefaultExceptionHandlers()
-
 /**
  * Helper function for coroutine builder implementations to handle uncaught and unexpected exceptions in coroutines,
  * that could not be otherwise handled in a normal way through structured concurrency, saving them to a future, and

kotlinx-coroutines-core/common/src/Job.kt

@@ -113,13 +113,7 @@ public interface Job : CoroutineContext.Element {
     /**
      * Key for [Job] instance in the coroutine context.
      */
-    public companion object Key : CoroutineContext.Key<Job> {
-        init {
-            // `Job` will necessarily be accessed early, so this is as good a place as any for the
-            // initialization logic that we want to happen as soon as possible
-            initializeDefaultExceptionHandlers()
-        }
-    }
+    public companion object Key : CoroutineContext.Key<Job>
 
     // ------------ state query ------------
 

kotlinx-coroutines-core/js/src/CoroutineExceptionHandlerImpl.kt

@@ -6,10 +6,6 @@ package kotlinx.coroutines
 
 import kotlin.coroutines.*
 
-internal actual fun initializeDefaultExceptionHandlers() {
-    // Do nothing
-}
-
 internal actual fun handleCoroutineExceptionImpl(context: CoroutineContext, exception: Throwable) {
     // log exception
     console.error(exception)

kotlinx-coroutines-core/jvm/src/CoroutineExceptionHandlerImpl.kt

@@ -22,11 +22,6 @@ private val handlers: List<CoroutineExceptionHandler> = ServiceLoader.load(
         CoroutineExceptionHandler::class.java.classLoader
 ).iterator().asSequence().toList()
 
-internal actual fun initializeDefaultExceptionHandlers() {
-    // Load CEH and handlers
-    CoroutineExceptionHandler
-}
-
 /**
  * Private exception without stacktrace that is added to suppressed exceptions of the original exception
  * when it is reported to the last-ditch current thread 'uncaughtExceptionHandler'.

kotlinx-coroutines-core/native/src/CoroutineExceptionHandlerImpl.kt

@@ -7,10 +7,6 @@ package kotlinx.coroutines
 import kotlin.coroutines.*
 import kotlin.native.*
 
-internal actual fun initializeDefaultExceptionHandlers() {
-    // Do nothing
-}
-
 @OptIn(ExperimentalStdlibApi::class)
 internal actual fun handleCoroutineExceptionImpl(context: CoroutineContext, exception: Throwable) {
     // log exception