diff --git a/runtime/src/main/kotlin/kotlin/Exceptions.kt b/runtime/src/main/kotlin/kotlin/Exceptions.kt
index 49587514eb2..834c2973636 100644
--- a/runtime/src/main/kotlin/kotlin/Exceptions.kt
+++ b/runtime/src/main/kotlin/kotlin/Exceptions.kt
@@ -18,207 +18,160 @@ package kotlin
 
 public open class Error : Throwable {
 
-    constructor() : super() {
-    }
+    constructor() : super()
 
-    constructor(message: String) : super(message) {
-    }
+    constructor(message: String?) : super(message)
 
-    constructor(message: String, cause: Throwable) : super(message, cause) {
-    }
+    constructor(message: String?, cause: Throwable?) : super(message, cause)
 
-    constructor(cause: Throwable) : super(cause) {
-    }
+    constructor(cause: Throwable?) : super(cause)
 }
 
 public open class Exception : Throwable {
 
-    constructor() : super() {
-    }
+    constructor() : super()
 
-    constructor(message: String) : super(message) {
-    }
+    constructor(message: String?) : super(message)
 
-    constructor(message: String, cause: Throwable) : super(message, cause) {
-    }
+    constructor(message: String?, cause: Throwable?) : super(message, cause)
 
-    constructor(cause: Throwable) : super(cause) {
-    }
+    constructor(cause: Throwable?) : super(cause)
 }
 
 public open class RuntimeException : Exception {
 
-    constructor() : super() {
-    }
+    constructor() : super()
 
-    constructor(message: String) : super(message) {
-    }
+    constructor(message: String?) : super(message)
 
-    constructor(message: String, cause: Throwable) : super(message, cause) {
-    }
+    constructor(message: String?, cause: Throwable?) : super(message, cause)
 
-    constructor(cause: Throwable) : super(cause) {
-    }
+    constructor(cause: Throwable?) : super(cause)
 }
 
 public class NullPointerException : RuntimeException {
 
-    constructor() : super() {
-    }
+    constructor() : super()
 
-    constructor(s: String) : super(s) {
-    }
+    constructor(s: String?) : super(s)
 }
 
 public open class NoSuchElementException : RuntimeException {
 
-    constructor() : super() {
-    }
+    constructor() : super()
 
-    constructor(s: String) : super(s) {
-    }
+    constructor(s: String?) : super(s)
 }
 
 public open class IllegalArgumentException : RuntimeException {
 
-    constructor() : super() {
-    }
+    constructor() : super()
 
-    constructor(s: String) : super(s) {
-    }
+    constructor(s: String?) : super(s)
 
-    constructor(message: String, cause: Throwable) : super(message, cause) {
-    }
+    constructor(message: String?, cause: Throwable?) : super(message, cause)
 
-    constructor(cause: Throwable) : super(cause) {
-    }
+    constructor(cause: Throwable?) : super(cause)
 }
 
 public open class IllegalStateException : RuntimeException {
 
-    constructor() : super() {
-    }
+    constructor() : super()
 
-    constructor(s: String) : super(s) {
-    }
+    constructor(s: String?) : super(s)
 
-    constructor(message: String, cause: Throwable) : super(message, cause) {
-    }
+    constructor(message: String?, cause: Throwable?) : super(message, cause)
 
-    constructor(cause: Throwable) : super(cause) {
-    }
+    constructor(cause: Throwable?) : super(cause)
 }
 
 public open class UnsupportedOperationException : RuntimeException {
 
-    constructor() {
-    }
+    constructor()
 
-    constructor(message: String) : super(message) {
-    }
+    constructor(message: String?) : super(message)
 
-    constructor(message: String, cause: Throwable) : super(message, cause) {
-    }
+    constructor(message: String?, cause: Throwable?) : super(message, cause)
 
-    constructor(cause: Throwable) : super(cause) {
-    }
+    constructor(cause: Throwable?) : super(cause)
 }
 
 public open class IndexOutOfBoundsException : RuntimeException {
 
-    constructor() : super() {
-    }
+    constructor() : super()
 
-    constructor(s: String) : super(s) {
-    }
+    constructor(s: String?) : super(s)
 }
 
 public open class ArrayIndexOutOfBoundsException : IndexOutOfBoundsException {
 
-    constructor() : super() {
-    }
+    constructor() : super()
 
-    constructor(s: String) : super(s) {
-    }
+    constructor(s: String?) : super(s)
 }
 
 public open class ClassCastException : RuntimeException {
 
-    constructor() : super() {
-    }
+    constructor() : super()
 
-    constructor(s: String) : super(s) {
-    }
+    constructor(s: String?) : super(s)
 }
 
 public open class TypeCastException : ClassCastException {
 
-    constructor() : super() {
-    }
+    constructor() : super()
 
-    constructor(s: String) : super(s) {
-    }
+    constructor(s: String?) : super(s)
 }
 
 public open class ArithmeticException : RuntimeException {
-    constructor() : super() {
-    }
+    constructor() : super()
 
-    constructor(s: String) : super(s) {
-    }
+    constructor(s: String?) : super(s)
 }
 
 public open class AssertionError : Error {
 
-    constructor() {
-    }
+    constructor()
 
-    constructor(message: String) : super(message) {
-    }
+    constructor(message: String?) : super(message)
 
-    constructor(message: Any) : super(message.toString()) {
-    }
+    constructor(message: Any?) : super(message.toString())
 
-    constructor(message: String, cause: Throwable) : super(message, cause) {
-    }
+    constructor(message: String?, cause: Throwable?) : super(message, cause)
 }
 
 public open class NoWhenBranchMatchedException : RuntimeException {
 
-    constructor() : super() {
-    }
+    constructor() : super()
 
-    constructor(s: String) : super(s) {
-    }
+    constructor(s: String?) : super(s)
 }
 
 public open class UninitializedPropertyAccessException : RuntimeException {
 
-    constructor() : super() {
-    }
+    constructor() : super()
 
-    constructor(s: String) : super(s) {
-    }
+    constructor(s: String?) : super(s)
 }
 
 public open class OutOfMemoryError : Error {
 
-    constructor() : super() {
-    }
+    constructor() : super()
 
-    constructor(s: String) : super(s) {
-    }
+    constructor(s: String?) : super(s)
 }
 
 public open class NumberFormatException : IllegalArgumentException {
 
-    constructor() : super()  {
-    }
+    constructor() : super()
 
-    constructor(s: String) : super(s) {}
+    constructor(s: String?) : super(s)
 }
 
 public open class IllegalCharacterConversionException : IllegalArgumentException {
+
     constructor(): super()
-    constructor(s: String) : super(s)
+
+    constructor(s: String?) : super(s)
 }
\ No newline at end of file