--- a/mercurial-common/src/jetbrains/buildServer/buildTriggers/vcs/mercurial/command/CatCommand.java	Fri May 30 10:26:36 2014 +0200
+++ b/mercurial-common/src/jetbrains/buildServer/buildTriggers/vcs/mercurial/command/CatCommand.java	Fri May 30 10:29:34 2014 +0200
@@ -44,40 +44,48 @@
     super(commandSettings, hgPath, workingDir, authSettings);
   }
 
+  @NotNull
   public CatCommand files(@NotNull String relativePath) {
     myRelativePaths = singletonList(relativePath);
     return this;
   }
 
+  @NotNull
   public CatCommand files(@NotNull List<String> relativePaths) {
     myRelativePaths = relativePaths;
     return this;
   }
 
+  @NotNull
   public CatCommand setRevId(final String revId) {
     myRevId = revId;
     return this;
   }
 
+  @NotNull
   public CatCommand atRevision(@NotNull ChangeSet cset) {
     myRevId = cset.getId();
     return this;
   }
 
+  @NotNull
   public CatCommand checkForFailure(boolean doCheckForFailure) {
     myCheckForFailure = doCheckForFailure;
     return this;
   }
 
+  @NotNull
   public File call() throws VcsException {
     return execute(myRelativePaths, myCheckForFailure);
   }
 
+  @NotNull
   public File execute(List<String> relPaths) throws VcsException {
     return execute(relPaths, true);
   }
 
-  public File execute(List<String> relPaths, boolean checkFailure) throws VcsException {
+  @NotNull
+  public File execute(@NotNull final List<String> relPaths, final boolean checkFailure) throws VcsException {
     File tempDir = null;
     try {
       tempDir = createTmpDir();
@@ -90,6 +98,7 @@
     }
   }
 
+  @NotNull
   private File createTmpDir() throws VcsException {
     try {
       return HgFileUtil.createTempDir();
@@ -98,7 +107,7 @@
     }
   }
 
-  private void createDirectories(List<String> relPaths, File tempDir) throws VcsException {
+  private void createDirectories(@NotNull final List<String> relPaths, @NotNull final File tempDir) throws VcsException {
     for (String path: relPaths) {
       File parentFile = new File(tempDir, path).getParentFile();
       if (!parentFile.isDirectory() && !parentFile.mkdirs())
@@ -106,8 +115,10 @@
     }
   }
 
-  private void catFiles(List<String> relPaths, boolean checkFailure, File tempDir) throws VcsException {
-    Queue<String> paths = new LinkedList<String>(relPaths);
+  private void catFiles(@NotNull final List<String> relPaths,
+                        final boolean checkFailure,
+                        @NotNull final File tempDir) throws VcsException {
+    final Queue<String> paths = new LinkedList<String>(relPaths);
     while (!paths.isEmpty()) {
       MercurialCommandLine cli = createCommandLine(tempDir);
       int cmdSize = cli.getCommandLineString().length() + 42;
@@ -122,8 +133,9 @@
     }
   }
 
+  @NotNull
   private MercurialCommandLine createCommandLine(@NotNull final File tempDir) {
-    MercurialCommandLine cli = createCommandLine();
+    final MercurialCommandLine cli = createCommandLine();
     addHttpAuthParams(cli);
     cli.addParameter("cat");
     cli.addParameter("-o");