diff --git a/.classpath b/.classpath
new file mode 100644
index 0000000..3341db0
--- /dev/null
+++ b/.classpath
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
+	<classpathentry combineaccessrules="false" kind="src" path="/jsr305"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>
diff --git a/.project b/.project
new file mode 100644
index 0000000..a2aed3a
--- /dev/null
+++ b/.project
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>guava</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>
diff --git a/Android.bp b/Android.bp
new file mode 100644
index 0000000..71dbc4b
--- /dev/null
+++ b/Android.bp
@@ -0,0 +1,103 @@
+// Copyright (C) 2010 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.
+
+java_library {
+    name: "guava",
+    host_supported: true,
+    hostdex: true,
+    sdk_version: "core_current",
+    target: {
+        android: {
+            static_libs: ["guava-android"],
+        },
+        host: {
+            static_libs: ["guava-jre"],
+        },
+    },
+    apex_available: [
+        "//apex_available:platform",
+        "//apex_available:anyapex",
+    ],
+}
+
+java_library {
+    name: "guava-both",
+    host_supported: true,
+    sdk_version: "core_current",
+    srcs: ["futures/failureaccess/**/*.java"],
+    static_libs: ["jsr305"],
+    libs: [
+        "guava-android-annotation-stubs",
+        "error_prone_annotations",
+    ],
+    java_version: "1.8",
+}
+
+java_library_host {
+    name: "guava-jre",
+    srcs: ["guava/src/**/*.java"],
+    static_libs: ["guava-both"],
+    libs: [
+        "guava-android-annotation-stubs",
+        "error_prone_annotations",
+    ],
+    java_version: "1.8",
+}
+
+java_library_host {
+    name: "guava-testlib",
+    srcs: ["guava-testlib/src/**/*.java"],
+    libs: [
+         "error_prone_annotations",
+         "guava",
+         "guava-android-annotation-stubs",
+         "jsr305",
+         "junit",
+    ],
+    java_version: "1.8",
+}
+
+// Guava for Android can't compile against an Android bootclasspath, compile
+// it for the host and then use it on the device.  It uses reflection to
+// prevent calling into methods that don't exist on Android.
+java_library_host {
+    name: "guava-android-host",
+    srcs: ["android/guava/src/**/*.java"],
+    static_libs: ["guava-both"],
+    libs: [
+        "guava-android-annotation-stubs",
+        "error_prone_annotations",
+    ],
+    java_version: "1.8",
+}
+
+java_host_for_device {
+    name: "guava-android",
+    libs: ["guava-android-host"],
+}
+
+// Compatibility name for existing host modules
+java_library_host {
+    name: "guavalib",
+    static_libs: ["guava"],
+}
+
+// Compile dummy implementations of annotations used by guava but not
+// present in the Android tree.
+java_library {
+    name: "guava-android-annotation-stubs",
+    host_supported: true,
+    sdk_version: "core_current",
+    srcs: ["android-annotation-stubs/src/**/*.java"],
+}
diff --git a/CleanSpec.mk b/CleanSpec.mk
new file mode 100644
index 0000000..b84e1b6
--- /dev/null
+++ b/CleanSpec.mk
@@ -0,0 +1,49 @@
+# Copyright (C) 2007 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.
+#
+
+# If you don't need to do a full clean build but would like to touch
+# a file or delete some intermediate files, add a clean step to the end
+# of the list.  These steps will only be run once, if they haven't been
+# run before.
+#
+# E.g.:
+#     $(call add-clean-step, touch -c external/sqlite/sqlite3.h)
+#     $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/STATIC_LIBRARIES/libz_intermediates)
+#
+# Always use "touch -c" and "rm -f" or "rm -rf" to gracefully deal with
+# files that are missing or have been moved.
+#
+# Use $(PRODUCT_OUT) to get to the "out/target/product/blah/" directory.
+# Use $(OUT_DIR) to refer to the "out" directory.
+#
+# If you need to re-do something that's already mentioned, just copy
+# the command and add it to the bottom of the list.  E.g., if a change
+# that you made last week required touching a file and a change you
+# made today requires touching the same file, just copy the old
+# touch step and add it to the end of the list.
+#
+# ************************************************
+# NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
+# ************************************************
+
+# For example:
+#$(call add-clean-step, rm -rf $(OUT_DIR)/target/common/obj/APPS/AndroidTests_intermediates)
+#$(call add-clean-step, rm -rf $(OUT_DIR)/target/common/obj/JAVA_LIBRARIES/core_intermediates)
+#$(call add-clean-step, find $(OUT_DIR) -type f -name "IGTalkSession*" -print0 | xargs -0 rm -f)
+#$(call add-clean-step, rm -rf $(PRODUCT_OUT)/data/*)
+
+# ************************************************
+# NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
+# ************************************************
diff --git a/METADATA b/METADATA
new file mode 100644
index 0000000..27cdada
--- /dev/null
+++ b/METADATA
@@ -0,0 +1,19 @@
+name: "guava"
+description: "Google Core Libraries for Java."
+third_party {
+  url {
+    type: HOMEPAGE
+    value: "https://github.com/google/guava"
+  }
+  url {
+    type: GIT
+    value: "https://github.com/google/guava.git"
+  }
+  version: "27.1"
+  license_type: NOTICE
+  last_upgrade_date {
+    year: 2019
+    month: 4
+    day: 10
+  }
+}
diff --git a/MODULE_LICENSE_APACHE2 b/MODULE_LICENSE_APACHE2
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/MODULE_LICENSE_APACHE2
diff --git a/NOTICE b/NOTICE
new file mode 100644
index 0000000..d645695
--- /dev/null
+++ b/NOTICE
@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
+
+   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.
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..87a5dbe
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1 @@
+include platform/libcore:/OWNERS
diff --git a/android-annotation-stubs/gen_annotations.sh b/android-annotation-stubs/gen_annotations.sh
new file mode 100755
index 0000000..82c06b1
--- /dev/null
+++ b/android-annotation-stubs/gen_annotations.sh
@@ -0,0 +1,42 @@
+#!/bin/bash
+
+ANNOTATIONS=(
+    org.checkerframework.checker.nullness.compatqual.MonotonicNonNullDecl
+    org.checkerframework.checker.nullness.compatqual.NullableDecl
+    org.checkerframework.checker.nullness.compatqual.NonNullDecl
+    org.checkerframework.checker.nullness.qual.NonNull
+    org.checkerframework.checker.nullness.qual.Nullable
+    org.checkerframework.checker.nullness.qual.MonotonicNonNull
+    org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
+    com.google.j2objc.annotations.J2ObjCIncompatible
+    com.google.j2objc.annotations.WeakOuter
+    com.google.j2objc.annotations.Weak
+    com.google.j2objc.annotations.ReflectionSupport
+    com.google.j2objc.annotations.RetainedWith
+)
+
+for a in ${ANNOTATIONS[@]}; do
+    package=${a%.*}
+    class=${a##*.}
+    dir=$(dirname $0)/src/${package//.//}
+    file=${class}.java
+
+    mkdir -p ${dir}
+    sed -e"s/__PACKAGE__/${package}/" -e"s/__CLASS__/${class}/" tmpl.java > ${dir}/${file}
+done
+
+f=$(dirname $0)/src/com/google/j2objc/annotations/ReflectionSupport.java
+head -n-1 ${f} > ${f}.tmp
+
+cat >> ${f}.tmp <<EOF
+public @interface ReflectionSupport {
+  enum Level {
+    FULL
+  }
+
+  Level value();
+}
+EOF
+
+mv ${f}.tmp ${f}
+
diff --git a/android-annotation-stubs/src/com/google/j2objc/annotations/J2ObjCIncompatible.java b/android-annotation-stubs/src/com/google/j2objc/annotations/J2ObjCIncompatible.java
new file mode 100644
index 0000000..c1aae52
--- /dev/null
+++ b/android-annotation-stubs/src/com/google/j2objc/annotations/J2ObjCIncompatible.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2019 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 com.google.j2objc.annotations;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target({
+    ElementType.ANNOTATION_TYPE,
+    ElementType.CONSTRUCTOR,
+    ElementType.FIELD,
+    ElementType.LOCAL_VARIABLE,
+    ElementType.METHOD,
+    ElementType.PACKAGE,
+    ElementType.PARAMETER,
+    ElementType.TYPE,
+    ElementType.TYPE_PARAMETER,
+    ElementType.TYPE_USE})
+@Retention(RetentionPolicy.SOURCE)
+public @interface J2ObjCIncompatible {}
diff --git a/android-annotation-stubs/src/com/google/j2objc/annotations/ReflectionSupport.java b/android-annotation-stubs/src/com/google/j2objc/annotations/ReflectionSupport.java
new file mode 100644
index 0000000..985dd45
--- /dev/null
+++ b/android-annotation-stubs/src/com/google/j2objc/annotations/ReflectionSupport.java
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2019 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 com.google.j2objc.annotations;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target({
+    ElementType.ANNOTATION_TYPE,
+    ElementType.CONSTRUCTOR,
+    ElementType.FIELD,
+    ElementType.LOCAL_VARIABLE,
+    ElementType.METHOD,
+    ElementType.PACKAGE,
+    ElementType.PARAMETER,
+    ElementType.TYPE,
+    ElementType.TYPE_PARAMETER,
+    ElementType.TYPE_USE})
+@Retention(RetentionPolicy.SOURCE)
+public @interface ReflectionSupport {
+  enum Level {
+    FULL
+  }
+
+  Level value();
+}
diff --git a/android-annotation-stubs/src/com/google/j2objc/annotations/RetainedWith.java b/android-annotation-stubs/src/com/google/j2objc/annotations/RetainedWith.java
new file mode 100644
index 0000000..30417f2
--- /dev/null
+++ b/android-annotation-stubs/src/com/google/j2objc/annotations/RetainedWith.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2019 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 com.google.j2objc.annotations;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target({
+    ElementType.ANNOTATION_TYPE,
+    ElementType.CONSTRUCTOR,
+    ElementType.FIELD,
+    ElementType.LOCAL_VARIABLE,
+    ElementType.METHOD,
+    ElementType.PACKAGE,
+    ElementType.PARAMETER,
+    ElementType.TYPE,
+    ElementType.TYPE_PARAMETER,
+    ElementType.TYPE_USE})
+@Retention(RetentionPolicy.SOURCE)
+public @interface RetainedWith {}
diff --git a/android-annotation-stubs/src/com/google/j2objc/annotations/Weak.java b/android-annotation-stubs/src/com/google/j2objc/annotations/Weak.java
new file mode 100644
index 0000000..a11d86a
--- /dev/null
+++ b/android-annotation-stubs/src/com/google/j2objc/annotations/Weak.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2019 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 com.google.j2objc.annotations;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target({
+    ElementType.ANNOTATION_TYPE,
+    ElementType.CONSTRUCTOR,
+    ElementType.FIELD,
+    ElementType.LOCAL_VARIABLE,
+    ElementType.METHOD,
+    ElementType.PACKAGE,
+    ElementType.PARAMETER,
+    ElementType.TYPE,
+    ElementType.TYPE_PARAMETER,
+    ElementType.TYPE_USE})
+@Retention(RetentionPolicy.SOURCE)
+public @interface Weak {}
diff --git a/android-annotation-stubs/src/com/google/j2objc/annotations/WeakOuter.java b/android-annotation-stubs/src/com/google/j2objc/annotations/WeakOuter.java
new file mode 100644
index 0000000..1e5748b
--- /dev/null
+++ b/android-annotation-stubs/src/com/google/j2objc/annotations/WeakOuter.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2019 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 com.google.j2objc.annotations;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target({
+    ElementType.ANNOTATION_TYPE,
+    ElementType.CONSTRUCTOR,
+    ElementType.FIELD,
+    ElementType.LOCAL_VARIABLE,
+    ElementType.METHOD,
+    ElementType.PACKAGE,
+    ElementType.PARAMETER,
+    ElementType.TYPE,
+    ElementType.TYPE_PARAMETER,
+    ElementType.TYPE_USE})
+@Retention(RetentionPolicy.SOURCE)
+public @interface WeakOuter {}
diff --git a/android-annotation-stubs/src/org/checkerframework/checker/nullness/compatqual/MonotonicNonNullDecl.java b/android-annotation-stubs/src/org/checkerframework/checker/nullness/compatqual/MonotonicNonNullDecl.java
new file mode 100644
index 0000000..9d7c9c3
--- /dev/null
+++ b/android-annotation-stubs/src/org/checkerframework/checker/nullness/compatqual/MonotonicNonNullDecl.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2019 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 org.checkerframework.checker.nullness.compatqual;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target({
+    ElementType.ANNOTATION_TYPE,
+    ElementType.CONSTRUCTOR,
+    ElementType.FIELD,
+    ElementType.LOCAL_VARIABLE,
+    ElementType.METHOD,
+    ElementType.PACKAGE,
+    ElementType.PARAMETER,
+    ElementType.TYPE,
+    ElementType.TYPE_PARAMETER,
+    ElementType.TYPE_USE})
+@Retention(RetentionPolicy.SOURCE)
+public @interface MonotonicNonNullDecl {}
diff --git a/android-annotation-stubs/src/org/checkerframework/checker/nullness/compatqual/NonNullDecl.java b/android-annotation-stubs/src/org/checkerframework/checker/nullness/compatqual/NonNullDecl.java
new file mode 100644
index 0000000..408277f
--- /dev/null
+++ b/android-annotation-stubs/src/org/checkerframework/checker/nullness/compatqual/NonNullDecl.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2019 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 org.checkerframework.checker.nullness.compatqual;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target({
+    ElementType.ANNOTATION_TYPE,
+    ElementType.CONSTRUCTOR,
+    ElementType.FIELD,
+    ElementType.LOCAL_VARIABLE,
+    ElementType.METHOD,
+    ElementType.PACKAGE,
+    ElementType.PARAMETER,
+    ElementType.TYPE,
+    ElementType.TYPE_PARAMETER,
+    ElementType.TYPE_USE})
+@Retention(RetentionPolicy.SOURCE)
+public @interface NonNullDecl {}
diff --git a/android-annotation-stubs/src/org/checkerframework/checker/nullness/compatqual/NullableDecl.java b/android-annotation-stubs/src/org/checkerframework/checker/nullness/compatqual/NullableDecl.java
new file mode 100644
index 0000000..cfcaba5
--- /dev/null
+++ b/android-annotation-stubs/src/org/checkerframework/checker/nullness/compatqual/NullableDecl.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2019 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 org.checkerframework.checker.nullness.compatqual;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target({
+    ElementType.ANNOTATION_TYPE,
+    ElementType.CONSTRUCTOR,
+    ElementType.FIELD,
+    ElementType.LOCAL_VARIABLE,
+    ElementType.METHOD,
+    ElementType.PACKAGE,
+    ElementType.PARAMETER,
+    ElementType.TYPE,
+    ElementType.TYPE_PARAMETER,
+    ElementType.TYPE_USE})
+@Retention(RetentionPolicy.SOURCE)
+public @interface NullableDecl {}
diff --git a/android-annotation-stubs/src/org/checkerframework/checker/nullness/qual/MonotonicNonNull.java b/android-annotation-stubs/src/org/checkerframework/checker/nullness/qual/MonotonicNonNull.java
new file mode 100644
index 0000000..f98da91
--- /dev/null
+++ b/android-annotation-stubs/src/org/checkerframework/checker/nullness/qual/MonotonicNonNull.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2019 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 org.checkerframework.checker.nullness.qual;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target({
+    ElementType.ANNOTATION_TYPE,
+    ElementType.CONSTRUCTOR,
+    ElementType.FIELD,
+    ElementType.LOCAL_VARIABLE,
+    ElementType.METHOD,
+    ElementType.PACKAGE,
+    ElementType.PARAMETER,
+    ElementType.TYPE,
+    ElementType.TYPE_PARAMETER,
+    ElementType.TYPE_USE})
+@Retention(RetentionPolicy.SOURCE)
+public @interface MonotonicNonNull {}
diff --git a/android-annotation-stubs/src/org/checkerframework/checker/nullness/qual/NonNull.java b/android-annotation-stubs/src/org/checkerframework/checker/nullness/qual/NonNull.java
new file mode 100644
index 0000000..876250f
--- /dev/null
+++ b/android-annotation-stubs/src/org/checkerframework/checker/nullness/qual/NonNull.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2019 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 org.checkerframework.checker.nullness.qual;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target({
+    ElementType.ANNOTATION_TYPE,
+    ElementType.CONSTRUCTOR,
+    ElementType.FIELD,
+    ElementType.LOCAL_VARIABLE,
+    ElementType.METHOD,
+    ElementType.PACKAGE,
+    ElementType.PARAMETER,
+    ElementType.TYPE,
+    ElementType.TYPE_PARAMETER,
+    ElementType.TYPE_USE})
+@Retention(RetentionPolicy.SOURCE)
+public @interface NonNull {}
diff --git a/android-annotation-stubs/src/org/checkerframework/checker/nullness/qual/Nullable.java b/android-annotation-stubs/src/org/checkerframework/checker/nullness/qual/Nullable.java
new file mode 100644
index 0000000..3c7975a
--- /dev/null
+++ b/android-annotation-stubs/src/org/checkerframework/checker/nullness/qual/Nullable.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2019 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 org.checkerframework.checker.nullness.qual;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target({
+    ElementType.ANNOTATION_TYPE,
+    ElementType.CONSTRUCTOR,
+    ElementType.FIELD,
+    ElementType.LOCAL_VARIABLE,
+    ElementType.METHOD,
+    ElementType.PACKAGE,
+    ElementType.PARAMETER,
+    ElementType.TYPE,
+    ElementType.TYPE_PARAMETER,
+    ElementType.TYPE_USE})
+@Retention(RetentionPolicy.SOURCE)
+public @interface Nullable {}
diff --git a/android-annotation-stubs/src/org/codehaus/mojo/animal_sniffer/IgnoreJRERequirement.java b/android-annotation-stubs/src/org/codehaus/mojo/animal_sniffer/IgnoreJRERequirement.java
new file mode 100644
index 0000000..0eeee48
--- /dev/null
+++ b/android-annotation-stubs/src/org/codehaus/mojo/animal_sniffer/IgnoreJRERequirement.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2019 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 org.codehaus.mojo.animal_sniffer;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target({
+    ElementType.ANNOTATION_TYPE,
+    ElementType.CONSTRUCTOR,
+    ElementType.FIELD,
+    ElementType.LOCAL_VARIABLE,
+    ElementType.METHOD,
+    ElementType.PACKAGE,
+    ElementType.PARAMETER,
+    ElementType.TYPE,
+    ElementType.TYPE_PARAMETER,
+    ElementType.TYPE_USE})
+@Retention(RetentionPolicy.SOURCE)
+public @interface IgnoreJRERequirement {}
diff --git a/android-annotation-stubs/tmpl.java b/android-annotation-stubs/tmpl.java
new file mode 100644
index 0000000..814c143
--- /dev/null
+++ b/android-annotation-stubs/tmpl.java
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2019 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 __PACKAGE__;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/* This is an annotation stub to avoid dependencies on annotations that aren't
+ * in the Android platform source tree. */
+
+@Target({
+    ElementType.ANNOTATION_TYPE,
+    ElementType.CONSTRUCTOR,
+    ElementType.FIELD,
+    ElementType.LOCAL_VARIABLE,
+    ElementType.METHOD,
+    ElementType.PACKAGE,
+    ElementType.PARAMETER,
+    ElementType.TYPE,
+    ElementType.TYPE_PARAMETER,
+    ElementType.TYPE_USE})
+@Retention(RetentionPolicy.SOURCE)
+public @interface __CLASS__ {}