diff --git a/platform/util/src/com/intellij/util/io/PersistentEnumerator.java b/platform/util/src/com/intellij/util/io/PersistentEnumerator.java
index 1b98322993ee..7fb982bd152f 100644
--- a/platform/util/src/com/intellij/util/io/PersistentEnumerator.java
+++ b/platform/util/src/com/intellij/util/io/PersistentEnumerator.java
@@ -35,7 +35,7 @@ import java.util.List;
  * @author max
  * @author jeka
  */
-public class PersistentEnumerator<Data> implements Forceable {
+public class PersistentEnumerator<Data> implements Forceable, Closeable {
   private static final Logger LOG = Logger.getInstance("#com.intellij.util.io.PersistentEnumerator");
   protected static final int NULL_ID = 0;
   protected static final int DATA_OFFSET = 8;
diff --git a/plugins/groovy/src/org/jetbrains/plugins/groovy/lang/psi/impl/statements/typedef/GrEnumTypeDefinitionImpl.java b/plugins/groovy/src/org/jetbrains/plugins/groovy/lang/psi/impl/statements/typedef/GrEnumTypeDefinitionImpl.java
index f0d412bcef89..46ce8c55f3df 100644
--- a/plugins/groovy/src/org/jetbrains/plugins/groovy/lang/psi/impl/statements/typedef/GrEnumTypeDefinitionImpl.java
+++ b/plugins/groovy/src/org/jetbrains/plugins/groovy/lang/psi/impl/statements/typedef/GrEnumTypeDefinitionImpl.java
@@ -36,6 +36,7 @@ import org.jetbrains.plugins.groovy.lang.psi.api.statements.typedef.members.GrEn
 import org.jetbrains.plugins.groovy.lang.psi.api.statements.typedef.members.GrEnumConstantList;
 import org.jetbrains.plugins.groovy.lang.psi.impl.statements.expressions.TypesUtil;
 import org.jetbrains.plugins.groovy.lang.psi.stubs.GrTypeDefinitionStub;
+import org.jetbrains.plugins.groovy.lang.psi.util.GroovyCommonClassNames;
 import org.jetbrains.plugins.groovy.lang.resolve.processors.ClassHint;
 
 import static org.jetbrains.plugins.groovy.GroovyFileType.GROOVY_LANGUAGE;
@@ -71,7 +72,7 @@ public class GrEnumTypeDefinitionImpl extends GrTypeDefinitionImpl implements Gr
 
   @NotNull
   public PsiClassType[] getExtendsListTypes() {
-    return new PsiClassType[]{createEnumType()};
+    return new PsiClassType[]{createEnumType(), createGroovyObjectSupportType()};
   }
 
   protected String[] getExtendsNames() {
@@ -94,6 +95,10 @@ public class GrEnumTypeDefinitionImpl extends GrTypeDefinitionImpl implements Gr
     return TypesUtil.createTypeByFQClassName(JAVA_LANG_ENUM, this);
   }
 
+  private PsiClassType createGroovyObjectSupportType() {
+    return TypesUtil.createTypeByFQClassName(GroovyCommonClassNames.GROOVY_OBJECT_SUPPORT, this);
+  }
+
   @NotNull
   public GrField[] getFields() {
     GrField[] bodyFields = super.getFields();
diff --git a/plugins/groovy/test/org/jetbrains/plugins/groovy/lang/GroovyHighlightingTest.java b/plugins/groovy/test/org/jetbrains/plugins/groovy/lang/GroovyHighlightingTest.java
index fdaf9f35de40..ee21a7511492 100644
--- a/plugins/groovy/test/org/jetbrains/plugins/groovy/lang/GroovyHighlightingTest.java
+++ b/plugins/groovy/test/org/jetbrains/plugins/groovy/lang/GroovyHighlightingTest.java
@@ -44,8 +44,8 @@ public class GroovyHighlightingTest extends LightCodeInsightFixtureTestCase {
     @Override
     public void configureModule(Module module, ModifiableRootModel model, ContentEntry contentEntry) {
       final Library.ModifiableModel modifiableModel = model.getModuleLibraryTable().createLibrary("GROOVY").getModifiableModel();
-      final VirtualFile groovyJar =
-        JarFileSystem.getInstance().refreshAndFindFileByPath(TestUtils.getMockGroovy1_8LibraryName()+"!/");
+      final VirtualFile groovyJar = JarFileSystem.getInstance().refreshAndFindFileByPath(TestUtils.getMockGroovy1_8LibraryName()+"!/");
+      assertTrue(groovyJar != null);
       modifiableModel.addRoot(groovyJar, OrderRootType.CLASSES);
       modifiableModel.commit();
     }
@@ -428,4 +428,8 @@ public class GroovyHighlightingTest extends LightCodeInsightFixtureTestCase {
   public void testDelegatedMethodIsImplemented() {
     doTest();
   }
+
+  public void testEnumImplementsAllGroovyObjectMethods() {
+    doTest();
+  }
 }
\ No newline at end of file
diff --git a/plugins/groovy/testdata/highlighting/EnumImplementsAllGroovyObjectMethods.groovy b/plugins/groovy/testdata/highlighting/EnumImplementsAllGroovyObjectMethods.groovy
new file mode 100644
index 000000000000..cfa2a5e0b606
--- /dev/null
+++ b/plugins/groovy/testdata/highlighting/EnumImplementsAllGroovyObjectMethods.groovy
@@ -0,0 +1,11 @@
+enum E {
+  a, b, c
+}
+
+interface I {
+  def foo()
+}
+
+enum <error descr="Method 'foo' is not implemented">EI</error> implements I {
+
+}
\ No newline at end of file
diff --git a/plugins/groovy/testdata/refactoring/move/moveMembers/outerClassTypeParameters/after/pack1/A.groovy b/plugins/groovy/testdata/refactoring/move/moveMembers/outerClassTypeParameters/after/pack1/A.groovy
index 1768d2266225..b53d354d83cf 100644
--- a/plugins/groovy/testdata/refactoring/move/moveMembers/outerClassTypeParameters/after/pack1/A.groovy
+++ b/plugins/groovy/testdata/refactoring/move/moveMembers/outerClassTypeParameters/after/pack1/A.groovy
@@ -1,5 +1,7 @@
 package pack1;
 
+import java.util.ArrayList;
+import java.util.List;
 
 public class A {
 }
\ No newline at end of file
diff --git a/plugins/maven/src/main/java/org/jetbrains/idea/maven/indices/MavenIndex.java b/plugins/maven/src/main/java/org/jetbrains/idea/maven/indices/MavenIndex.java
index 39b104c7738a..e541585e25ee 100644
--- a/plugins/maven/src/main/java/org/jetbrains/idea/maven/indices/MavenIndex.java
+++ b/plugins/maven/src/main/java/org/jetbrains/idea/maven/indices/MavenIndex.java
@@ -651,7 +651,7 @@ public class MavenIndex {
       if (exceptions[0] != null) throw exceptions[0];
     }
 
-    private void safeClose(PersistentEnumerator enumerator, MavenIndexException[] exceptions) {
+    private void safeClose(Closeable enumerator, MavenIndexException[] exceptions) {
       try {
         if (enumerator != null) enumerator.close();
       }