diff --git a/src/org/jetbrains/jet/j2k/ast/ForeachWithRangeStatement.java b/src/org/jetbrains/jet/j2k/ast/ForeachWithRangeStatement.java
index b5669d33a68..b6aa9e622e0 100644
--- a/src/org/jetbrains/jet/j2k/ast/ForeachWithRangeStatement.java
+++ b/src/org/jetbrains/jet/j2k/ast/ForeachWithRangeStatement.java
@@ -6,10 +6,10 @@ import org.jetbrains.annotations.NotNull;
  * @author ignatov
  */
 public class ForeachWithRangeStatement extends Statement {
-  private Expression myStart;
-  private IdentifierImpl myIdentifier;
-  private Expression myEnd;
-  private Statement myBody;
+  private final Expression myStart;
+  private final IdentifierImpl myIdentifier;
+  private final Expression myEnd;
+  private final Statement myBody;
 
   public ForeachWithRangeStatement(IdentifierImpl identifier, Expression start, Expression end, Statement body) {
     myStart = start;
diff --git a/src/org/jetbrains/jet/j2k/ast/IdentifierImpl.java b/src/org/jetbrains/jet/j2k/ast/IdentifierImpl.java
index c487cfb5fff..9a75669b02d 100644
--- a/src/org/jetbrains/jet/j2k/ast/IdentifierImpl.java
+++ b/src/org/jetbrains/jet/j2k/ast/IdentifierImpl.java
@@ -39,7 +39,7 @@ public class IdentifierImpl extends Expression implements Identifier {
     return myIsNullable;
   }
 
-  private String ifNeedQuote(String name) {
+  private static String ifNeedQuote(String name) {
     if (ONLY_KOTLIN_KEYWORDS.contains(name) || name.contains("$"))
       return quote(name);
     return name;
diff --git a/src/org/jetbrains/jet/j2k/util/AstUtil.java b/src/org/jetbrains/jet/j2k/util/AstUtil.java
index 7b2c391fe3c..d5715267101 100644
--- a/src/org/jetbrains/jet/j2k/util/AstUtil.java
+++ b/src/org/jetbrains/jet/j2k/util/AstUtil.java
@@ -9,7 +9,10 @@ import java.util.List;
  * @author ignatov
  */
 public class AstUtil {
-  private static String join(final String array[], final String delimiter) {
+  private AstUtil() {
+  }
+
+  private static String join(final String[] array, final String delimiter) {
     StringBuilder buffer = new StringBuilder();
     boolean haveDelimiter = (delimiter != null);
 
diff --git a/test/org/jetbrains/jet/j2k/JavaToKotlinConverterTest.java b/test/org/jetbrains/jet/j2k/JavaToKotlinConverterTest.java
index 2a205a86981..608c3997d5d 100644
--- a/test/org/jetbrains/jet/j2k/JavaToKotlinConverterTest.java
+++ b/test/org/jetbrains/jet/j2k/JavaToKotlinConverterTest.java
@@ -92,18 +92,18 @@ public class JavaToKotlinConverterTest extends LightDaemonAnalyzerTestCase {
     return suite;
   }
 
-  static void configureFromText(String text) throws IOException {
+  private static void configureFromText(String text) throws IOException {
     configureFromFileText("test.java", text);
   }
 
   @NotNull
-  static String fileToKotlin(String text) throws IOException {
+  private static String fileToKotlin(String text) throws IOException {
     configureFromText(text);
     return prettify(Converter.fileToFile((PsiJavaFile) myFile).toKotlin());
   }
 
   @NotNull
-  static String methodToKotlin(String text) throws IOException {
+  private static String methodToKotlin(String text) throws IOException {
     String result = fileToKotlin("final class C {" + text + "}")
       .replaceAll("class C\\(\\) \\{", "");
     result = result.substring(0, result.lastIndexOf("}"));
@@ -111,7 +111,7 @@ public class JavaToKotlinConverterTest extends LightDaemonAnalyzerTestCase {
   }
 
   @NotNull
-  static String statementToKotlin(String text) throws Exception {
+  private static String statementToKotlin(String text) throws Exception {
     String result = methodToKotlin("void main() {" + text + "}");
     int pos = result.lastIndexOf("}");
     result = result.substring(0, pos).replaceFirst("fun main\\(\\) : Unit \\{", "");
@@ -119,7 +119,7 @@ public class JavaToKotlinConverterTest extends LightDaemonAnalyzerTestCase {
   }
 
   @NotNull
-  static String expressionToKotlin(String code) throws Exception {
+  private static String expressionToKotlin(String code) throws Exception {
     String result = statementToKotlin("Object o =" + code + "}");
     result = result.replaceFirst("var o : Any\\? =", "");
     return prettify(result);