diff --git a/java/java-psi-impl/src/com/intellij/core/CoreJavaFileManager.java b/java/java-psi-impl/src/com/intellij/core/CoreJavaFileManager.java
index a4a26f9f3f5e..ee05766fa04e 100644
--- a/java/java-psi-impl/src/com/intellij/core/CoreJavaFileManager.java
+++ b/java/java-psi-impl/src/com/intellij/core/CoreJavaFileManager.java
@@ -18,6 +18,7 @@ package com.intellij.core;
 import com.intellij.openapi.diagnostic.Logger;
 import com.intellij.openapi.roots.PackageIndex;
 import com.intellij.openapi.util.io.FileUtil;
+import com.intellij.openapi.vfs.VfsUtilCore;
 import com.intellij.openapi.vfs.VirtualFile;
 import com.intellij.openapi.vfs.impl.jar.CoreJarFileSystem;
 import com.intellij.openapi.vfs.local.CoreLocalFileSystem;
@@ -30,8 +31,10 @@ import com.intellij.util.Query;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
-import java.io.File;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
 
 /**
  * @author yole
@@ -41,8 +44,7 @@ public class CoreJavaFileManager extends PackageIndex implements JavaFileManager
 
   private final CoreLocalFileSystem myLocalFileSystem;
   private final CoreJarFileSystem myJarFileSystem;
-  private final List<File> myClasspath = new ArrayList<File>();
-  private VirtualFile[] myClasspathRoots = null;
+  private final List<VirtualFile> myClasspath = new ArrayList<VirtualFile>();
 
   private final PsiManager myPsiManager;
 
@@ -52,33 +54,8 @@ public class CoreJavaFileManager extends PackageIndex implements JavaFileManager
     myJarFileSystem = jarFileSystem;
   }
 
-  private VirtualFile[] roots() {
-    VirtualFile[] answer = myClasspathRoots;
-
-    if (answer == null) {
-      ArrayList<VirtualFile> answerList = new ArrayList<VirtualFile>(myClasspath.size());
-      for (File root : myClasspath) {
-        VirtualFile rootVfs = calcRoot(root);
-        if (rootVfs != null) {
-          answerList.add(rootVfs);
-        }
-      }
-
-      answer = answerList.toArray(new VirtualFile[answerList.size()]);
-      myClasspathRoots = answer;
-    }
-
-    return answer;
-  }
-
-  @Nullable
-  private VirtualFile calcRoot(File root) {
-    if (root.isFile()) {
-       return myJarFileSystem.findFileByPath(root.getPath() + "!/");
-    }
-    else {
-      return myLocalFileSystem.findFileByPath(root.getPath());
-    }
+  private List<VirtualFile> roots() {
+    return myClasspath;
   }
 
   @Override
@@ -104,10 +81,10 @@ public class CoreJavaFileManager extends PackageIndex implements JavaFileManager
 
   @Nullable
   public PsiPackage getPackage(PsiDirectory dir) {
-    final File ioFile = new File(dir.getVirtualFile().getPath());
-    for (File root : myClasspath) {
-      if (FileUtil.isAncestor(root, ioFile, false)) {
-        final String relativePath = FileUtil.getRelativePath(root.getPath(), ioFile.getPath(), '.');
+    final VirtualFile file = dir.getVirtualFile();
+    for (VirtualFile root : myClasspath) {
+      if (VfsUtilCore.isAncestor(root, file, false)) {
+        final String relativePath = FileUtil.getRelativePath(root.getPath(), file.getPath(), '.');
         return new PsiPackageImpl(myPsiManager, relativePath);
       }
     }
@@ -223,8 +200,7 @@ public class CoreJavaFileManager extends PackageIndex implements JavaFileManager
   public void initialize() {
   }
 
-  public void addToClasspath(File path) {
-    myClasspath.add(path);
-    myClasspathRoots = null;
+  public void addToClasspath(VirtualFile root) {
+    myClasspath.add(root);
   }
 }
diff --git a/java/java-psi-impl/src/com/intellij/core/JavaCoreProjectEnvironment.java b/java/java-psi-impl/src/com/intellij/core/JavaCoreProjectEnvironment.java
index 52889658c3e3..86d73bf6ecad 100644
--- a/java/java-psi-impl/src/com/intellij/core/JavaCoreProjectEnvironment.java
+++ b/java/java-psi-impl/src/com/intellij/core/JavaCoreProjectEnvironment.java
@@ -30,6 +30,7 @@ import com.intellij.psi.impl.JavaPsiImplementationHelper;
 import com.intellij.psi.impl.PsiElementFactoryImpl;
 import com.intellij.psi.impl.source.resolve.JavaResolveCache;
 import com.intellij.psi.impl.source.resolve.PsiResolveHelperImpl;
+import org.jetbrains.annotations.NotNull;
 
 import java.io.File;
 
@@ -61,18 +62,21 @@ public class JavaCoreProjectEnvironment  extends CoreProjectEnvironment {
     return new CoreJavaFileManager(myPsiManager, getEnvironment().getLocalFileSystem(), getEnvironment().getJarFileSystem());
   }
 
-  public void addToClasspath(File path) {
-    final VirtualFile root = path.isFile()
-                             ? getEnvironment().getJarFileSystem().findFileByPath(path + "!/")
-                             : getEnvironment().getLocalFileSystem().findFileByPath(path.getPath());
+  public void addJarToClassPath (File path) {
+    assert path.isFile();
 
-    if (root != null) {
-      myFileManager.addToClasspath(path);
-      myFileIndexFacade.addLibraryRoot(root);
-    }
-    else {
+    final VirtualFile root = getEnvironment().getJarFileSystem().findFileByPath(path + "!/");
+    if (root == null) {
       throw new IllegalArgumentException("trying to add non-existing file to classpath: " + path);
     }
+
+    addSourcesToClasspath(root);
+  }
+
+  public void addSourcesToClasspath(@NotNull VirtualFile root) {
+    assert root.isDirectory();
+    myFileManager.addToClasspath(root);
+    myFileIndexFacade.addLibraryRoot(root);
   }
 
 }
diff --git a/platform/core-impl/src/com/intellij/core/CoreProjectEnvironment.java b/platform/core-impl/src/com/intellij/core/CoreProjectEnvironment.java
index 832a2265c53a..26b584b105fc 100644
--- a/platform/core-impl/src/com/intellij/core/CoreProjectEnvironment.java
+++ b/platform/core-impl/src/com/intellij/core/CoreProjectEnvironment.java
@@ -24,7 +24,6 @@ import com.intellij.openapi.extensions.ExtensionPointName;
 import com.intellij.openapi.extensions.Extensions;
 import com.intellij.openapi.project.DumbService;
 import com.intellij.openapi.roots.FileIndexFacade;
-import com.intellij.openapi.vfs.VirtualFile;
 import com.intellij.psi.PsiFileFactory;
 import com.intellij.psi.PsiManager;
 import com.intellij.psi.impl.*;
@@ -78,10 +77,6 @@ public class CoreProjectEnvironment {
     CoreApplicationEnvironment.registerExtensionPoint(Extensions.getArea(myProject), extensionPointName, aClass);
   }
 
-  public void addLibraryRoot(VirtualFile file) {
-    myFileIndexFacade.addLibraryRoot(file);
-  }
-
   public  <T> void registerProjectComponent(final Class<T> interfaceClass, final T implementation) {
     CoreApplicationEnvironment.registerComponentInstance(myProject.getPicoContainer(), interfaceClass, implementation);
   }