diff --git a/JavaLibrary.bp b/JavaLibrary.bp
index 21645d3..0f8df96 100644
--- a/JavaLibrary.bp
+++ b/JavaLibrary.bp
@@ -127,7 +127,6 @@
 
     java_resource_dirs: core_resource_dirs,
     java_resources: [":android_icu4j_resources"],
-    java_version: "1.9",
 
     required: [
         "tzdata",
@@ -193,7 +192,6 @@
 
     srcs: [":core_libart_java_files"],
     java_resources: [":android_icu4j_resources"],
-    java_version: "1.9",
 
     no_standard_libs: true,
     libs: ["core-all"],
@@ -247,7 +245,6 @@
     dex_preopt: {
         enabled: false,
     },
-    java_version: "1.9",
     notice: "ojluni/NOTICE",
     required: [
         "tzdata",
@@ -500,7 +497,6 @@
 droidstubs {
     name: "core-current-stubs-gen",
     srcs: [":core_api_files"],
-    java_version: "1.9",
     installable: false,
     no_framework_libs: true,
     args: " --exclude-annotations",
diff --git a/luni/src/main/java/libcore/internal/Java9LanguageFeatures.java b/luni/src/main/java/libcore/internal/Java9LanguageFeatures.java
deleted file mode 100644
index 7e201d0..0000000
--- a/luni/src/main/java/libcore/internal/Java9LanguageFeatures.java
+++ /dev/null
@@ -1,85 +0,0 @@
-/*
- * Copyright (C) 2018 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package libcore.internal;
-
-import java.io.ByteArrayInputStream;
-import java.io.ByteArrayOutputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.List;
-import java.util.Objects;
-import java.util.concurrent.atomic.AtomicReference;
-
-/**
- * Proof of concept / dummy code whose only purpose is to demonstrate that Java 9
- * language features are supported in libcore.
- */
-public class Java9LanguageFeatures {
-
-    public interface Person {
-        String name();
-
-        default boolean isPalindrome() {
-            return name().equals(reverse(name()));
-        }
-
-        default boolean isPalindromeIgnoreCase() {
-            return name().equalsIgnoreCase(reverse(name()));
-        }
-
-        // Language feature: private interface method
-        private String reverse(String s) {
-            return new StringBuilder(s).reverse().toString();
-        }
-    }
-
-    @SafeVarargs
-    public static<T> String toListString(T... values) {
-        return toString(values).toString();
-    }
-
-    // Language feature: @SafeVarargs on private methods
-    @SafeVarargs
-    private static<T> List<String> toString(T... values) {
-        List<String> result = new ArrayList<>();
-        for (T value : values) {
-            result.add(value.toString());
-        }
-        return result;
-    }
-
-    public <T> AtomicReference<T> createReference(T content) {
-        // Language feature: <> on anonymous class
-        return new AtomicReference<>(content) { };
-    }
-
-    public static byte[] copy(byte[] bytes) throws IOException {
-        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
-        InputStream inputStream = new ByteArrayInputStream(bytes);
-        try (inputStream) { // Language feature: try on effectively-final variable
-            int value;
-            while ((value = inputStream.read()) != -1) {
-                byteArrayOutputStream.write(value);
-            }
-        }
-        return byteArrayOutputStream.toByteArray();
-    }
-
-
-}
diff --git a/luni/src/test/java/libcore/libcore/internal/Java9LanguageFeaturesTest.java b/luni/src/test/java/libcore/libcore/internal/Java9LanguageFeaturesTest.java
deleted file mode 100644
index cc48ec0..0000000
--- a/luni/src/test/java/libcore/libcore/internal/Java9LanguageFeaturesTest.java
+++ /dev/null
@@ -1,60 +0,0 @@
-/*
- * Copyright (C) 2018 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package libcore.libcore.internal;
-
-import java.io.IOException;
-import java.util.Arrays;
-import java.util.Objects;
-import java.util.concurrent.atomic.AtomicReference;
-import junit.framework.TestCase;
-import libcore.internal.Java9LanguageFeatures;
-
-public class Java9LanguageFeaturesTest extends TestCase {
-
-    public static class SimplePerson implements Java9LanguageFeatures.Person {
-        private final String name;
-        public SimplePerson(String name) { this.name = Objects.requireNonNull(name); }
-        @Override public String toString() { return "Person: " + name; }
-        @Override public String name() { return name; }
-    }
-
-    public void testPrivateInterfaceMethods() {
-        assertFalse(new SimplePerson("Anna").isPalindrome());
-        assertTrue(new SimplePerson("Anna").isPalindromeIgnoreCase());
-        assertTrue(new SimplePerson("anna").isPalindrome());
-        assertTrue(new SimplePerson("bob").isPalindrome());
-        assertFalse(new SimplePerson("larry").isPalindrome());
-        assertFalse(new SimplePerson("larry").isPalindromeIgnoreCase());
-    }
-
-    public void testTryOnEffectivelyFinalVariables() throws IOException {
-        byte[] data = "Hello, world!".getBytes();
-        byte[] dataCopy = Java9LanguageFeatures.copy(data);
-        assertTrue(Arrays.equals(data, dataCopy));
-        assertTrue(data != dataCopy);
-    }
-
-    public void testDiamondOnAnonymousClasses() {
-        AtomicReference<String> ref = new Java9LanguageFeatures().createReference("Hello, world");
-        assertSame("Hello, world", ref.get());
-    }
-
-    public void testSafeVarargsOnPrivateMethod() {
-        assertEquals("[23, and, 42]", Java9LanguageFeatures.toListString(23, "and", 42L));
-    }
-
-}
diff --git a/mmodules/libart_oj/Android.bp b/mmodules/libart_oj/Android.bp
index e3d7ded..950e9b1 100644
--- a/mmodules/libart_oj/Android.bp
+++ b/mmodules/libart_oj/Android.bp
@@ -38,7 +38,6 @@
     no_standard_libs: true,
     libs: ["core.intra.stubs"],
     system_modules: "core-intra-stubs-system-modules",
-    java_version: "1.9",
     openjdk9: {
         javacflags: ["--patch-module=java.base=."],
     },
diff --git a/mmodules/simple/Android.bp b/mmodules/simple/Android.bp
index ddfed99..94e8164 100644
--- a/mmodules/simple/Android.bp
+++ b/mmodules/simple/Android.bp
@@ -41,7 +41,6 @@
     name: "core-simple",
     hostdex: true,
     defaults: ["core-simple-defaults"],
-    java_version: "1.9",
 }
 
 // A guaranteed unstripped version of core-simple.
@@ -53,7 +52,6 @@
     dex_preopt: {
         enabled: false,
     },
-    java_version: "1.9",
 }
 
 // A rule that checks we can build core-simple using only the source for
@@ -95,7 +93,6 @@
     no_framework_libs: true,
 
     installable: false,
-    java_version: "1.9",
     args: "--show-annotation libcore.mmodule.IntraCoreMModuleApi",
 }
 
@@ -114,5 +111,4 @@
     openjdk9: {
         javacflags: ["--patch-module=java.base=."],
     },
-    java_version: "1.9",
 }
diff --git a/non_openjdk_java_files.bp b/non_openjdk_java_files.bp
index df04980..0b5244c 100644
--- a/non_openjdk_java_files.bp
+++ b/non_openjdk_java_files.bp
@@ -263,7 +263,6 @@
         "luni/src/main/java/libcore/icu/NativeConverter.java",
         "luni/src/main/java/libcore/icu/RelativeDateTimeFormatter.java",
         "luni/src/main/java/libcore/icu/TimeZoneNames.java",
-        "luni/src/main/java/libcore/internal/Java9LanguageFeatures.java",
         "luni/src/main/java/libcore/internal/StringPool.java",
         "luni/src/main/java/libcore/io/AsynchronousCloseMonitor.java",
         "luni/src/main/java/libcore/io/ClassPathURLStreamHandler.java",