diff --git a/j2k/src/org/jetbrains/jet/j2k/ConstructorConverter.kt b/j2k/src/org/jetbrains/jet/j2k/ConstructorConverter.kt
index ea6711e5c37..658b4651a0e 100644
--- a/j2k/src/org/jetbrains/jet/j2k/ConstructorConverter.kt
+++ b/j2k/src/org/jetbrains/jet/j2k/ConstructorConverter.kt
@@ -27,6 +27,9 @@ import java.util.HashSet
 class ConstructorConverter(private val converter: Converter) {
     private val typeConverter = converter.typeConverter
 
+    private val tempValName: String = "__"
+    private fun tempValIdentifier(): Identifier = Identifier(tempValName, false).assignNoPrototype()
+
     public fun convertConstructor(constructor: PsiMethod,
                                   annotations: Annotations,
                                   modifiers: Modifiers,
@@ -285,6 +288,49 @@ class ConstructorConverter(private val converter: Converter) {
         return statements
     }
 
-    private val tempValName: String = "__"
-    private fun tempValIdentifier(): Identifier = Identifier(tempValName, false).assignNoPrototype()
+    private fun PsiMethod.isPrimaryConstructor(): Boolean {
+        if (!isConstructor()) return false
+        val parent = getParent()
+        if (parent !is PsiClass) return false
+        return parent.getPrimaryConstructor() == this
+    }
+
+    private fun PsiClass.getPrimaryConstructor(): PsiMethod? {
+        val constructors = getConstructors()
+        when (constructors.size) {
+            0 -> return null
+
+            1 -> return constructors.single()
+
+            else -> {
+                val toTargetConstructorMap = HashMap<PsiMethod, PsiMethod>()
+                for (constructor in constructors) {
+                    val firstStatement = constructor.getBody()?.getStatements()?.firstOrNull()
+                    val refExpr = ((firstStatement as? PsiExpressionStatement)
+                            ?.getExpression() as? PsiMethodCallExpression)
+                            ?.getMethodExpression()
+                    if (refExpr != null && refExpr.getCanonicalText() == "this") {
+                        val target = refExpr.resolve() as? PsiMethod
+                        if (target != null && target.isConstructor()) {
+                            val finalTarget = toTargetConstructorMap[target] ?: target!!/*TODO: see KT-5335*/
+                            toTargetConstructorMap[constructor] = finalTarget
+                            for (entry in toTargetConstructorMap.entrySet()) {
+                                if (entry.getValue() == constructor) {
+                                    entry.setValue(finalTarget)
+                                }
+                            }
+                        }
+                    }
+                }
+
+                val candidates = constructors.filter { it !in toTargetConstructorMap }
+                if (candidates.size != 1) return null // there should be only one constructor which does not call other constructor
+                val candidate = candidates.single()
+                return if (toTargetConstructorMap.values().all { it == candidate } /* all other constructors call our candidate (directly or indirectly)*/)
+                    candidate
+                else
+                    null
+            }
+        }
+    }
 }
\ No newline at end of file
diff --git a/j2k/src/org/jetbrains/jet/j2k/ConstructorUtils.kt b/j2k/src/org/jetbrains/jet/j2k/ConstructorUtils.kt
deleted file mode 100644
index d373f0f1b83..00000000000
--- a/j2k/src/org/jetbrains/jet/j2k/ConstructorUtils.kt
+++ /dev/null
@@ -1,91 +0,0 @@
-/*
- * Copyright 2010-2013 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.jet.j2k
-
-import com.intellij.psi.*
-import java.util.HashMap
-
-fun PsiMethod.isPrimaryConstructor(): Boolean {
-    if (!isConstructor()) return false
-    val parent = getParent()
-    if (parent !is PsiClass) return false
-    return parent.getPrimaryConstructor() == this
-}
-
-fun PsiClass.getPrimaryConstructor(): PsiMethod? {
-    val constructors = getConstructors()
-    when (constructors.size) {
-        0 -> return null
-
-        1 -> return constructors.single()
-
-        else -> {
-            val toTargetConstructorMap = HashMap<PsiMethod, PsiMethod>()
-            for (constructor in constructors) {
-                val firstStatement = constructor.getBody()?.getStatements()?.firstOrNull()
-                val refExpr = ((firstStatement as? PsiExpressionStatement)
-                        ?.getExpression() as? PsiMethodCallExpression)
-                            ?.getMethodExpression()
-                if (refExpr != null && refExpr.getCanonicalText() == "this") {
-                    val target = refExpr.resolve() as? PsiMethod
-                    if (target != null && target.isConstructor()) {
-                        val finalTarget = toTargetConstructorMap[target] ?: target!!/*TODO: see KT-5335*/
-                        toTargetConstructorMap[constructor] = finalTarget
-                        for (entry in toTargetConstructorMap.entrySet()) {
-                            if (entry.getValue() == constructor) {
-                                entry.setValue(finalTarget)
-                            }
-                        }
-                    }
-                }
-            }
-
-            val candidates = constructors.filter { it !in toTargetConstructorMap }
-            if (candidates.size != 1) return null // there should be only one constructor which does not call other constructor
-            val candidate = candidates.single()
-            return if (toTargetConstructorMap.values().all { it == candidate } /* all other constructors call our candidate (directly or indirectly)*/)
-                candidate
-            else
-                null
-        }
-    }
-}
-
-fun PsiElement.getContainingMethod(): PsiMethod? {
-    var context = getContext()
-    while (context != null) {
-        val _context = context!!
-        if (_context is PsiMethod) return _context
-        context = _context.getContext()
-    }
-    return null
-}
-
-fun PsiElement.getContainingConstructor(): PsiMethod? {
-    val method = getContainingMethod()
-    return if (method?.isConstructor() == true) method else null
-}
-
-fun PsiMethodCallExpression.isSuperConstructorCall(): Boolean {
-    val ref = getMethodExpression()
-    if (ref.getCanonicalText() == "super") {
-        return ref.resolve()?.isConstructor() ?: false
-    }
-    return false
-}
-
-fun PsiElement.isConstructor(): Boolean = this is PsiMethod && this.isConstructor()
diff --git a/j2k/src/org/jetbrains/jet/j2k/Utils.kt b/j2k/src/org/jetbrains/jet/j2k/Utils.kt
index 6570b940239..98f48b8f9e6 100644
--- a/j2k/src/org/jetbrains/jet/j2k/Utils.kt
+++ b/j2k/src/org/jetbrains/jet/j2k/Utils.kt
@@ -22,10 +22,8 @@ import com.intellij.psi.util.PsiUtil
 import com.intellij.psi.search.LocalSearchScope
 import com.intellij.psi.search.searches.ReferencesSearch
 import org.jetbrains.jet.j2k.ast.*
-import com.intellij.codeInsight.AnnotationUtil
-import com.intellij.codeInsight.NullableNotNullManager
 
-fun quoteKeywords(packageName: String): String = packageName.split("\\.").map { Identifier.toKotlin(it) }.makeString(".")
+fun quoteKeywords(packageName: String): String = packageName.split("\\.").map { Identifier.toKotlin(it) }.joinToString(".")
 
 fun findVariableUsages(variable: PsiVariable, scope: PsiElement): Collection<PsiReferenceExpression> {
     return ReferencesSearch.search(variable, LocalSearchScope(scope)).findAll().filterIsInstance(javaClass<PsiReferenceExpression>())
@@ -111,3 +109,28 @@ fun PsiElement.isInSingleLine(): Boolean {
     }
     return true
 }
+
+fun PsiElement.getContainingMethod(): PsiMethod? {
+    var context = getContext()
+    while (context != null) {
+        val _context = context!!
+        if (_context is PsiMethod) return _context
+        context = _context.getContext()
+    }
+    return null
+}
+
+fun PsiElement.getContainingConstructor(): PsiMethod? {
+    val method = getContainingMethod()
+    return if (method?.isConstructor() == true) method else null
+}
+
+fun PsiMethodCallExpression.isSuperConstructorCall(): Boolean {
+    val ref = getMethodExpression()
+    if (ref.getCanonicalText() == "super") {
+        return ref.resolve()?.isConstructor() ?: false
+    }
+    return false
+}
+
+fun PsiElement.isConstructor(): Boolean = this is PsiMethod && this.isConstructor()