diff --git a/platform/util/src/com/intellij/util/io/BinaryOutputReader.java b/platform/util/src/com/intellij/util/io/BinaryOutputReader.java
index a80fb50796cd..e8e5bea20d40 100644
--- a/platform/util/src/com/intellij/util/io/BinaryOutputReader.java
+++ b/platform/util/src/com/intellij/util/io/BinaryOutputReader.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2013 JetBrains s.r.o.
+ * Copyright 2000-2015 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.
@@ -24,11 +24,10 @@ import java.io.InputStream;
 * @author Konstantin Kolosovsky.
 */
 public abstract class BinaryOutputReader extends BaseDataReader {
-
   @NotNull private final InputStream myStream;
   @NotNull private final byte[] myBuffer = new byte[8192];
 
-  public BinaryOutputReader(@NotNull InputStream stream, SleepingPolicy sleepingPolicy) {
+  public BinaryOutputReader(@NotNull InputStream stream, @NotNull SleepingPolicy sleepingPolicy) {
     super(sleepingPolicy);
     myStream = stream;
   }
diff --git a/plugins/hg4idea/src/org/zmlx/hg4idea/execution/HgCommandProcessHandler.java b/plugins/hg4idea/src/org/zmlx/hg4idea/execution/HgCommandProcessHandler.java
index f5c2aa4ac961..a0dad361bfbc 100644
--- a/plugins/hg4idea/src/org/zmlx/hg4idea/execution/HgCommandProcessHandler.java
+++ b/plugins/hg4idea/src/org/zmlx/hg4idea/execution/HgCommandProcessHandler.java
@@ -21,7 +21,6 @@ import com.intellij.execution.process.OSProcessHandler;
 import com.intellij.util.io.BaseDataReader;
 import com.intellij.util.io.BinaryOutputReader;
 import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
 
 import java.io.ByteArrayOutputStream;
 import java.io.InputStream;
@@ -32,7 +31,7 @@ class HgCommandProcessHandler extends OSProcessHandler {
   private final boolean myBinary;
   private final ByteArrayOutputStream myBinaryOutput;
 
-  public HgCommandProcessHandler(@NotNull GeneralCommandLine commandLine, boolean binary) throws ExecutionException {
+  HgCommandProcessHandler(@NotNull GeneralCommandLine commandLine, boolean binary) throws ExecutionException {
     super(commandLine);
     myBinary = binary;
     myBinaryOutput = new ByteArrayOutputStream();
@@ -40,7 +39,7 @@ class HgCommandProcessHandler extends OSProcessHandler {
 
   @NotNull
   @Override
-  protected BaseDataReader createOutputDataReader(BaseDataReader.SleepingPolicy sleepingPolicy) {
+  protected BaseDataReader createOutputDataReader(@NotNull BaseDataReader.SleepingPolicy sleepingPolicy) {
     return myBinary ? new MyBinaryOutputReader(myProcess.getInputStream(), sleepingPolicy) : super.createOutputDataReader(sleepingPolicy);
   }
 
@@ -50,8 +49,7 @@ class HgCommandProcessHandler extends OSProcessHandler {
   }
 
   private class MyBinaryOutputReader extends BinaryOutputReader {
-
-    public MyBinaryOutputReader(@NotNull InputStream stream, @Nullable BaseDataReader.SleepingPolicy simple) {
+    private MyBinaryOutputReader(@NotNull InputStream stream, @NotNull BaseDataReader.SleepingPolicy simple) {
       super(stream, simple);
       start();
     }
diff --git a/plugins/hg4idea/src/org/zmlx/hg4idea/execution/ShellCommand.java b/plugins/hg4idea/src/org/zmlx/hg4idea/execution/ShellCommand.java
index 568a56f72f94..c4d141b53ac6 100644
--- a/plugins/hg4idea/src/org/zmlx/hg4idea/execution/ShellCommand.java
+++ b/plugins/hg4idea/src/org/zmlx/hg4idea/execution/ShellCommand.java
@@ -35,8 +35,8 @@ public final class ShellCommand {
 
   private final GeneralCommandLine myCommandLine;
 
-  public ShellCommand(@Nullable List<String> commandLine, @Nullable String dir, @Nullable Charset charset) {
-    if (commandLine == null || commandLine.isEmpty()) {
+  public ShellCommand(@NotNull List<String> commandLine, @Nullable String dir, @Nullable Charset charset) {
+    if (commandLine.isEmpty()) {
       throw new IllegalArgumentException("commandLine is empty");
     }
     myCommandLine = new GeneralCommandLine(commandLine);
diff --git a/plugins/svn4idea/src/org/jetbrains/idea/svn/commandLine/SvnProcessHandler.java b/plugins/svn4idea/src/org/jetbrains/idea/svn/commandLine/SvnProcessHandler.java
index 04c82ade65bd..6707bf3e44eb 100644
--- a/plugins/svn4idea/src/org/jetbrains/idea/svn/commandLine/SvnProcessHandler.java
+++ b/plugins/svn4idea/src/org/jetbrains/idea/svn/commandLine/SvnProcessHandler.java
@@ -61,7 +61,7 @@ public class SvnProcessHandler extends OSProcessHandler {
 
   @NotNull
   @Override
-  protected BaseDataReader createOutputDataReader(BaseDataReader.SleepingPolicy sleepingPolicy) {
+  protected BaseDataReader createOutputDataReader(@NotNull BaseDataReader.SleepingPolicy sleepingPolicy) {
     if (myForceBinary) {
       return new SimpleBinaryOutputReader(myProcess.getInputStream(), sleepingPolicy);
     }
@@ -69,8 +69,7 @@ public class SvnProcessHandler extends OSProcessHandler {
   }
 
   private class SimpleBinaryOutputReader extends BinaryOutputReader {
-
-    public SimpleBinaryOutputReader(@NotNull InputStream stream, SleepingPolicy sleepingPolicy) {
+    private SimpleBinaryOutputReader(@NotNull InputStream stream, @NotNull SleepingPolicy sleepingPolicy) {
       super(stream, sleepingPolicy);
       start();
     }