diff --git a/java/java-usages/openidea-java-usages.jar b/java/java-usages/openidea-java-usages.jar
index 63ca14d94..c2924301e 100644
Binary files a/java/java-usages/openidea-java-usages.jar and b/java/java-usages/openidea-java-usages.jar differ
diff --git a/java/java-usages/src/ai/openidea/implementations/ImplementationsCommand.java b/java/java-usages/src/ai/openidea/implementations/ImplementationsCommand.java
index 821af09c2..50bd541af 100644
--- a/java/java-usages/src/ai/openidea/implementations/ImplementationsCommand.java
+++ b/java/java-usages/src/ai/openidea/implementations/ImplementationsCommand.java
@@ -8,6 +8,11 @@ import org.eclipse.core.resources.ResourcesPlugin;
 import org.eclipse.core.runtime.IProgressMonitor;
 import org.eclipse.core.runtime.OperationCanceledException;
 import org.eclipse.jdt.core.*;
+import org.eclipse.jdt.core.search.IJavaSearchScope;
+import org.eclipse.jdt.core.search.SearchEngine;
+import org.eclipse.jdt.internal.core.CreateTypeHierarchyOperation;
+import org.eclipse.jdt.internal.core.DefaultWorkingCopyOwner;
+import org.eclipse.jdt.internal.core.JavaModelManager;
 import org.eclipse.jdt.internal.corext.util.MethodOverrideTester;
 import org.eclipse.jdt.ls.core.internal.IDelegateCommandHandler;
 import org.eclipse.jdt.ls.core.internal.JDTUtils;
@@ -56,7 +61,7 @@ public final class ImplementationsCommand implements IDelegateCommandHandler {
             return false;
         }
         if (type == null || type.getJavaProject() == null) return false;
-        IRegion sources = JavaCore.newRegion();
+        List<IJavaElement> sources = new ArrayList<>();
         for (IJavaProject project : JavaCore.create(ResourcesPlugin.getWorkspace().getRoot()).getJavaProjects()) {
             for (IPackageFragmentRoot fragmentRoot : project.getPackageFragmentRoots()) {
                 if (fragmentRoot.getKind() == IPackageFragmentRoot.K_SOURCE || isKotlinOutput(fragmentRoot)) {
@@ -64,7 +69,13 @@ public final class ImplementationsCommand implements IDelegateCommandHandler {
                 }
             }
         }
-        ITypeHierarchy hierarchy = type.getJavaProject().newTypeHierarchy(type, sources, monitor);
+        // IType.newTypeHierarchy's operation over the sources: the index narrows the subtypes to the
+        // files that name a supertype, where a region hierarchy resolves every type in the region.
+        ICompilationUnit[] workingCopies = JavaModelManager.getJavaModelManager().getWorkingCopies(DefaultWorkingCopyOwner.PRIMARY, true);
+        IJavaSearchScope scope = SearchEngine.createJavaSearchScope(sources.toArray(IJavaElement[]::new));
+        CreateTypeHierarchyOperation operation = new CreateTypeHierarchyOperation(type, workingCopies, scope, true);
+        operation.runOperation(monitor);
+        ITypeHierarchy hierarchy = operation.getResult();
         for (IType subtype : hierarchy.getAllSubtypes(type)) {
             if (monitor.isCanceled()) throw new OperationCanceledException();
             IMember found;
diff --git a/java/java-usages/tests/implementations.py b/java/java-usages/tests/implementations.py
index ed39b519d..5655fb6a8 100644
--- a/java/java-usages/tests/implementations.py
+++ b/java/java-usages/tests/implementations.py
@@ -72,6 +72,21 @@ public class Task implements Runnable {
     public void run() {
     }
 }
+''',
+    'Anon.java': '''package zoo;
+
+public class Anon {
+    Repo<Double> make() {
+        class Local implements Repo<Double> {
+            public void save(Double item) {
+            }
+        }
+        return new Repo<Double>() {
+            public void save(Double item) {
+            }
+        };
+    }
+}
 ''',
     'Use.java': '''package zoo;
 
@@ -174,11 +189,11 @@ try:
     request('java/buildWorkspace', True)
     # (implementations in the sources, whether they are all there are)
     cases = {
-        # Classes, abstract ones too, and those of the bridged Kotlin output; not the sub-interface.
-        ('Repo.java', 'Repo<T>'): (['Base.java:2', 'Longs.java:0', 'Numbers.java:2', 'Words.java:2'], True),
+        # Classes, abstract, local and anonymous ones too, and those of the bridged Kotlin output; not the sub-interface.
+        ('Repo.java', 'Repo<T>'): (['Anon.java:4', 'Anon.java:8', 'Base.java:2', 'Longs.java:0', 'Numbers.java:2', 'Words.java:2'], True),
         # Through the type arguments; not the abstract re-declaration.
-        ('Repo.java', 'save(T'): (['Longs.java:0', 'Numbers.java:3', 'Words.java:3'], True),
-        ('Use.java', 'save("x")'): (['Longs.java:0', 'Numbers.java:3', 'Words.java:3'], True),
+        ('Repo.java', 'save(T'): (['Anon.java:5', 'Anon.java:9', 'Longs.java:0', 'Numbers.java:3', 'Words.java:3'], True),
+        ('Use.java', 'save("x")'): (['Anon.java:5', 'Anon.java:9', 'Longs.java:0', 'Numbers.java:3', 'Words.java:3'], True),
         ('Repo.java', 'name()'): (['Words.java:6'], True),
         # A library type's implementations in the sources; the library has more.
         ('Use.java', 'Runnable task'): (['Task.java:2'], False),