Make sure alt-headers actually work in "core" environment

compiler/cli/src/org/jetbrains/jet/compiler/JetCoreEnvironment.java

@@ -4,8 +4,10 @@ import com.intellij.core.JavaCoreEnvironment;
 import com.intellij.lang.java.JavaParserDefinition;
 import com.intellij.mock.MockApplication;
 import com.intellij.openapi.Disposable;
+import com.intellij.openapi.vfs.VirtualFile;
 import org.jetbrains.jet.lang.parsing.JetParserDefinition;
 import org.jetbrains.jet.plugin.JetFileType;
+import org.jetbrains.jet.plugin.compiler.PathUtil;
 
 /**
  * @author yole
@@ -26,6 +28,9 @@ public class JetCoreEnvironment extends JavaCoreEnvironment {
                 .registerExtension(new JavaElementFinder(myProject));
 */
 
+        for (VirtualFile root : PathUtil.getAltHeadersRoots()) {
+            addLibraryRoot(root);
+        }
     }
 
     public MockApplication getApplication() {

compiler/frontend.java/src/org/jetbrains/jet/lang/resolve/java/alt/AltClassFinder.java

@@ -6,7 +6,6 @@ package org.jetbrains.jet.lang.resolve.java.alt;
 import com.intellij.openapi.diagnostic.Logger;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.vfs.VirtualFile;
-import com.intellij.openapi.vfs.VirtualFileManager;
 import com.intellij.psi.PsiClass;
 import com.intellij.psi.PsiClassOwner;
 import com.intellij.psi.PsiFile;
@@ -14,27 +13,18 @@ import com.intellij.psi.PsiManager;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.jet.plugin.compiler.PathUtil;
 
-import java.io.File;
-import java.util.ArrayList;
 import java.util.List;
 
 public class AltClassFinder {
     private static final Logger LOG = Logger.getInstance("#org.jetbrains.jet.lang.resolve.java.alt.AltClassFinder");
 
     private final PsiManager psiManager;
-    private final List<VirtualFile> roots = new ArrayList<VirtualFile>();
+    private final List<VirtualFile> roots;
+    
 
     public AltClassFinder(Project project) {
         psiManager = PsiManager.getInstance(project);
-
+        this.roots = PathUtil.getAltHeadersRoots();
-        File alts = PathUtil.getAltHeadersPath();
-
-        if (alts != null) {
-            for (File root : alts.listFiles()) {
-                VirtualFile jarRoot = VirtualFileManager.getInstance().findFileByUrl("jar://" + root.getPath() + "!/");
-                roots.add(jarRoot);
-            }
-        }
     }
 
     public PsiClass findClass(@NotNull String qualifiedName) {

compiler/util/src/org/jetbrains/jet/plugin/compiler/PathUtil.java

@@ -4,9 +4,13 @@
 package org.jetbrains.jet.plugin.compiler;
 
 import com.intellij.openapi.application.PathManager;
+import com.intellij.openapi.vfs.VirtualFile;
+import com.intellij.openapi.vfs.VirtualFileManager;
 import org.jetbrains.annotations.NotNull;
 
 import java.io.File;
+import java.util.ArrayList;
+import java.util.List;
 
 public class PathUtil {
     private PathUtil() {}
@@ -64,4 +68,18 @@ public class PathUtil {
         String resourceRoot = PathManager.getResourceRoot(aClass, "/" + aClass.getName().replace('.', '/') + ".class");
         return new File(resourceRoot).getAbsoluteFile().getAbsolutePath();
     }
+
+    public static List<VirtualFile> getAltHeadersRoots() {
+        List<VirtualFile> roots = new ArrayList<VirtualFile>();
+
+        File alts = getAltHeadersPath();
+
+        if (alts != null) {
+            for (File root : alts.listFiles()) {
+                VirtualFile jarRoot = VirtualFileManager.getInstance().findFileByUrl("jar://" + root.getPath() + "!/");
+                roots.add(jarRoot);
+            }
+        }
+        return roots;
+    }
 }