diff --git a/.github/workflows/jnigen.yaml b/.github/workflows/jnigen.yaml
index 806251180..42a0577da 100644
--- a/.github/workflows/jnigen.yaml
+++ b/.github/workflows/jnigen.yaml
@@ -84,7 +84,7 @@ jobs:
       - uses: actions/setup-java@6a0805fcefea3d4657a47ac4c165951e33482018
         with:
           distribution: 'zulu'
-          java-version: '11'
+          java-version: '17'
           cache: maven
       ## Committed bindings are formatted with clang-format.
       ## So this is required to format generated bindings identically
@@ -135,7 +135,7 @@ jobs:
       - uses: actions/setup-java@6a0805fcefea3d4657a47ac4c165951e33482018
         with:
           distribution: 'zulu'
-          java-version: '11'
+          java-version: '17'
       - uses: axel-op/googlejavaformat-action@fe78db8a90171b6a836449f8d0e982d5d71e5c5a
         name: 'Check Java formatting with google-java-format'
         with:
@@ -173,7 +173,7 @@ jobs:
       - uses: actions/setup-java@6a0805fcefea3d4657a47ac4c165951e33482018
         with:
           distribution: 'zulu'
-          java-version: '11'
+          java-version: '17'
       - run: |
           sudo apt-get update -y
           sudo apt-get install -y ninja-build libgtk-3-dev libclang-dev
@@ -222,7 +222,7 @@ jobs:
       - uses: actions/setup-java@6a0805fcefea3d4657a47ac4c165951e33482018
         with:
           distribution: 'zulu'
-          java-version: '11'
+          java-version: '17'
       - run: Add-Content $env:GITHUB_PATH "$env:JAVA_HOME\bin\server"
       - run: dart pub get
       - run: dart run jni:setup
@@ -249,7 +249,7 @@ jobs:
       - uses: actions/setup-java@6a0805fcefea3d4657a47ac4c165951e33482018
         with:
           distribution: 'zulu'
-          java-version: '11'
+          java-version: '17'
       - run: git config --global core.autocrlf true
       - run: Add-Content $env:GITHUB_PATH "$env:JAVA_HOME\bin\server"
       - run: dart pub get
@@ -275,7 +275,7 @@ jobs:
       - uses: actions/setup-java@6a0805fcefea3d4657a47ac4c165951e33482018
         with:
           distribution: 'temurin'
-          java-version: '11'
+          java-version: '17'
       - run: dart pub get
       - run: dart run jni:setup
       - run: dart test --test-randomize-ordering-seed random
@@ -300,7 +300,7 @@ jobs:
       - uses: actions/setup-java@6a0805fcefea3d4657a47ac4c165951e33482018
         with:
           distribution: 'temurin'
-          java-version: '11'
+          java-version: '17'
       - run: git config --global core.autocrlf true
       - run: dart pub get
       - name: Build summarizer
@@ -323,7 +323,7 @@ jobs:
       - uses: actions/setup-java@6a0805fcefea3d4657a47ac4c165951e33482018
         with:
           distribution: 'zulu'
-          java-version: '11'
+          java-version: '17'
       - run: |
           sudo apt-get update -y
           sudo apt-get install -y ninja-build libgtk-3-dev
@@ -347,7 +347,7 @@ jobs:
       - uses: actions/setup-java@6a0805fcefea3d4657a47ac4c165951e33482018
         with:
           distribution: 'zulu'
-          java-version: '11'
+          java-version: '17'
       - run: flutter config --enable-windows-desktop
       - run: flutter pub get
       - run: flutter build windows
@@ -362,7 +362,7 @@ jobs:
       - uses: actions/setup-java@6a0805fcefea3d4657a47ac4c165951e33482018
         with:
           distribution: 'zulu'
-          java-version: '11'
+          java-version: '17'
       - uses: subosito/flutter-action@44ac965b96f18d999802d4b807e3256d5a3f9fa1
         with:
           channel: 'stable'
@@ -386,7 +386,7 @@ jobs:
       - uses: actions/setup-java@6a0805fcefea3d4657a47ac4c165951e33482018
         with:
           distribution: 'zulu'
-          java-version: '11'
+          java-version: '17'
       - run: |
           sudo apt-get update -y
           sudo apt-get install -y ninja-build libgtk-3-dev clang-format
diff --git a/pkgs/jni/example/android/app/build.gradle b/pkgs/jni/example/android/app/build.gradle
index 1578d193d..e2f649869 100644
--- a/pkgs/jni/example/android/app/build.gradle
+++ b/pkgs/jni/example/android/app/build.gradle
@@ -23,6 +23,8 @@ if (flutterVersionName == null) {
 }
 
 android {
+    namespace "com.github.dart_lang.jni_example"
+
     compileSdkVersion flutter.compileSdkVersion
     ndkVersion flutter.ndkVersion
 
diff --git a/pkgs/jni/example/android/gradle/wrapper/gradle-wrapper.properties b/pkgs/jni/example/android/gradle/wrapper/gradle-wrapper.properties
index cc5527d78..7aeeb11c6 100644
--- a/pkgs/jni/example/android/gradle/wrapper/gradle-wrapper.properties
+++ b/pkgs/jni/example/android/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.4-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-all.zip
diff --git a/pkgs/jni/example/android/settings.gradle b/pkgs/jni/example/android/settings.gradle
index 536165d35..03e70fe44 100644
--- a/pkgs/jni/example/android/settings.gradle
+++ b/pkgs/jni/example/android/settings.gradle
@@ -18,7 +18,7 @@ pluginManagement {
 
 plugins {
     id "dev.flutter.flutter-plugin-loader" version "1.0.0"
-    id "com.android.application" version "7.3.0" apply false
+    id "com.android.application" version "8.6.0" apply false
     id "org.jetbrains.kotlin.android" version "1.7.10" apply false
 }
 
diff --git a/pkgs/jni/pubspec.yaml b/pkgs/jni/pubspec.yaml
index 48dc04701..09dce1f04 100644
--- a/pkgs/jni/pubspec.yaml
+++ b/pkgs/jni/pubspec.yaml
@@ -21,7 +21,7 @@ environment:
 dependencies:
   args: ^2.3.1
   collection: ^1.0.0
-  ffi: ^2.0.1
+  ffi: ^2.1.3
   package_config: ^2.1.0
   path: ^1.8.0
   plugin_platform_interface: ^2.0.2
diff --git a/pkgs/jnigen/android_test_runner/android/app/build.gradle b/pkgs/jnigen/android_test_runner/android/app/build.gradle
index 18596cf0a..033226005 100644
--- a/pkgs/jnigen/android_test_runner/android/app/build.gradle
+++ b/pkgs/jnigen/android_test_runner/android/app/build.gradle
@@ -23,7 +23,9 @@ if (flutterVersionName == null) {
 }
 
 android {
-    compileSdkVersion flutter.compileSdkVersion
+    namespace "com.github.dart_lang.jnigen.android_integration_test"
+
+    compileSdkVersion 35
     ndkVersion flutter.ndkVersion
 
     compileOptions {
@@ -42,7 +44,6 @@ android {
     }
 
     defaultConfig {
-        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "com.github.dart_lang.jnigen.android_integration_test"
         // You can update the following values to match your application needs.
         // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.
diff --git a/pkgs/jnigen/android_test_runner/android/gradle/wrapper/gradle-wrapper.properties b/pkgs/jnigen/android_test_runner/android/gradle/wrapper/gradle-wrapper.properties
index 3c472b99c..3c85cfe05 100644
--- a/pkgs/jnigen/android_test_runner/android/gradle/wrapper/gradle-wrapper.properties
+++ b/pkgs/jnigen/android_test_runner/android/gradle/wrapper/gradle-wrapper.properties
@@ -2,4 +2,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.5-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-all.zip
diff --git a/pkgs/jnigen/android_test_runner/android/settings.gradle b/pkgs/jnigen/android_test_runner/android/settings.gradle
index 536165d35..03e70fe44 100644
--- a/pkgs/jnigen/android_test_runner/android/settings.gradle
+++ b/pkgs/jnigen/android_test_runner/android/settings.gradle
@@ -18,7 +18,7 @@ pluginManagement {
 
 plugins {
     id "dev.flutter.flutter-plugin-loader" version "1.0.0"
-    id "com.android.application" version "7.3.0" apply false
+    id "com.android.application" version "8.6.0" apply false
     id "org.jetbrains.kotlin.android" version "1.7.10" apply false
 }
 
diff --git a/pkgs/jnigen/example/in_app_java/android/app/build.gradle b/pkgs/jnigen/example/in_app_java/android/app/build.gradle
index 96798166c..8c8168980 100644
--- a/pkgs/jnigen/example/in_app_java/android/app/build.gradle
+++ b/pkgs/jnigen/example/in_app_java/android/app/build.gradle
@@ -23,7 +23,9 @@ if (flutterVersionName == null) {
 }
 
 android {
-    compileSdkVersion flutter.compileSdkVersion
+    namespace "com.example.in_app_java"
+
+    compileSdkVersion 35
     ndkVersion flutter.ndkVersion
 
     compileOptions {
@@ -40,7 +42,6 @@ android {
     }
 
     defaultConfig {
-        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "com.example.in_app_java"
         // You can update the following values to match your application needs.
         // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-build-configuration.
diff --git a/pkgs/jnigen/example/in_app_java/android/gradle/wrapper/gradle-wrapper.properties b/pkgs/jnigen/example/in_app_java/android/gradle/wrapper/gradle-wrapper.properties
index cc5527d78..7aeeb11c6 100644
--- a/pkgs/jnigen/example/in_app_java/android/gradle/wrapper/gradle-wrapper.properties
+++ b/pkgs/jnigen/example/in_app_java/android/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.4-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-all.zip
diff --git a/pkgs/jnigen/example/in_app_java/android/settings.gradle b/pkgs/jnigen/example/in_app_java/android/settings.gradle
index 536165d35..03e70fe44 100644
--- a/pkgs/jnigen/example/in_app_java/android/settings.gradle
+++ b/pkgs/jnigen/example/in_app_java/android/settings.gradle
@@ -18,7 +18,7 @@ pluginManagement {
 
 plugins {
     id "dev.flutter.flutter-plugin-loader" version "1.0.0"
-    id "com.android.application" version "7.3.0" apply false
+    id "com.android.application" version "8.6.0" apply false
     id "org.jetbrains.kotlin.android" version "1.7.10" apply false
 }
 
diff --git a/pkgs/jnigen/example/in_app_java/lib/android_utils.dart b/pkgs/jnigen/example/in_app_java/lib/android_utils.dart
index 0a73adc93..2459d5d0b 100644
--- a/pkgs/jnigen/example/in_app_java/lib/android_utils.dart
+++ b/pkgs/jnigen/example/in_app_java/lib/android_utils.dart
@@ -2855,6 +2855,9 @@ class Build_VERSION_CODES extends jni.JObject {
 
   /// from: `static public final int UPSIDE_DOWN_CAKE`
   static const UPSIDE_DOWN_CAKE = 34;
+
+  /// from: `static public final int VANILLA_ICE_CREAM`
+  static const VANILLA_ICE_CREAM = 35;
   static final _id_new$ = _class.constructorId(
     r'()V',
   );
@@ -4130,6 +4133,32 @@ class HashMap<$K extends jni.JObject, $V extends jni.JObject>
     return _clone(reference.pointer, _id_clone as jni.JMethodIDPtr)
         .object(const jni.JObjectType());
   }
+
+  static final _id_newHashMap = _class.staticMethodId(
+    r'newHashMap',
+    r'(I)Ljava/util/HashMap;',
+  );
+
+  static final _newHashMap = ProtectedJniExtensions.lookup<
+          ffi.NativeFunction<
+              jni.JniResult Function(ffi.Pointer<ffi.Void>, jni.JMethodIDPtr,
+                  ffi.VarArgs<($Int32,)>)>>('globalEnv_CallStaticObjectMethod')
+      .asFunction<
+          jni.JniResult Function(
+              ffi.Pointer<ffi.Void>, jni.JMethodIDPtr, int)>();
+
+  /// from: `static public java.util.HashMap newHashMap(int i)`
+  /// The returned object must be released after use, by calling the [release] method.
+  static HashMap<$K, $V>
+      newHashMap<$K extends jni.JObject, $V extends jni.JObject>(
+    int i, {
+    required jni.JObjType<$K> K,
+    required jni.JObjType<$V> V,
+  }) {
+    return _newHashMap(
+            _class.reference.pointer, _id_newHashMap as jni.JMethodIDPtr, i)
+        .object($HashMapType(K, V));
+  }
 }
 
 final class $HashMapType<$K extends jni.JObject, $V extends jni.JObject>
diff --git a/pkgs/jnigen/example/kotlin_plugin/android/build.gradle b/pkgs/jnigen/example/kotlin_plugin/android/build.gradle
index 04bce9b0c..3393b9fbe 100644
--- a/pkgs/jnigen/example/kotlin_plugin/android/build.gradle
+++ b/pkgs/jnigen/example/kotlin_plugin/android/build.gradle
@@ -14,6 +14,8 @@ apply plugin: 'com.android.library'
 apply plugin: 'kotlin-android'
 
 android {
+    namespace 'com.example.kotlin_plugin'
+
     // Bumping the plugin compileSdkVersion requires all clients of this plugin
     // to bump the version in their app.
     compileSdkVersion 31
diff --git a/pkgs/jnigen/example/kotlin_plugin/example/android/app/build.gradle b/pkgs/jnigen/example/kotlin_plugin/example/android/app/build.gradle
index 542a2d4bb..355a12ad8 100644
--- a/pkgs/jnigen/example/kotlin_plugin/example/android/app/build.gradle
+++ b/pkgs/jnigen/example/kotlin_plugin/example/android/app/build.gradle
@@ -23,7 +23,9 @@ if (flutterVersionName == null) {
 }
 
 android {
-    compileSdkVersion flutter.compileSdkVersion
+    namespace "com.example.kotlin_plugin.example"
+
+    compileSdkVersion 35
     ndkVersion flutter.ndkVersion
 
     compileOptions {
@@ -40,7 +42,6 @@ android {
     }
 
     defaultConfig {
-        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "com.example.kotlin_plugin.example"
         // You can update the following values to match your application needs.
         // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.
diff --git a/pkgs/jnigen/example/kotlin_plugin/example/android/gradle/wrapper/gradle-wrapper.properties b/pkgs/jnigen/example/kotlin_plugin/example/android/gradle/wrapper/gradle-wrapper.properties
index 3c472b99c..3c85cfe05 100644
--- a/pkgs/jnigen/example/kotlin_plugin/example/android/gradle/wrapper/gradle-wrapper.properties
+++ b/pkgs/jnigen/example/kotlin_plugin/example/android/gradle/wrapper/gradle-wrapper.properties
@@ -2,4 +2,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.5-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-all.zip
diff --git a/pkgs/jnigen/example/kotlin_plugin/example/android/settings.gradle b/pkgs/jnigen/example/kotlin_plugin/example/android/settings.gradle
index 536165d35..03e70fe44 100644
--- a/pkgs/jnigen/example/kotlin_plugin/example/android/settings.gradle
+++ b/pkgs/jnigen/example/kotlin_plugin/example/android/settings.gradle
@@ -18,7 +18,7 @@ pluginManagement {
 
 plugins {
     id "dev.flutter.flutter-plugin-loader" version "1.0.0"
-    id "com.android.application" version "7.3.0" apply false
+    id "com.android.application" version "8.6.0" apply false
     id "org.jetbrains.kotlin.android" version "1.7.10" apply false
 }
 
diff --git a/pkgs/jnigen/example/notification_plugin/android/build.gradle b/pkgs/jnigen/example/notification_plugin/android/build.gradle
index fd63c0d8a..763c15ec3 100644
--- a/pkgs/jnigen/example/notification_plugin/android/build.gradle
+++ b/pkgs/jnigen/example/notification_plugin/android/build.gradle
@@ -13,6 +13,8 @@ rootProject.allprojects {
 apply plugin: 'com.android.library'
 
 android {
+    namespace 'com.example.notification_plugin'
+
     // Bumping the plugin compileSdkVersion requires all clients of this plugin
     // to bump the version in their app.
     compileSdkVersion 31
diff --git a/pkgs/jnigen/example/notification_plugin/example/android/app/build.gradle b/pkgs/jnigen/example/notification_plugin/example/android/app/build.gradle
index a8c8103ab..3491cecc5 100644
--- a/pkgs/jnigen/example/notification_plugin/example/android/app/build.gradle
+++ b/pkgs/jnigen/example/notification_plugin/example/android/app/build.gradle
@@ -23,7 +23,9 @@ if (flutterVersionName == null) {
 }
 
 android {
-    compileSdkVersion flutter.compileSdkVersion
+    namespace "com.example.notification_plugin_example"
+
+    compileSdkVersion 35
     ndkVersion flutter.ndkVersion
 
     compileOptions {
@@ -40,7 +42,6 @@ android {
     }
 
     defaultConfig {
-        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "com.example.notification_plugin_example"
         // You can update the following values to match your application needs.
         // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-build-configuration.
diff --git a/pkgs/jnigen/example/notification_plugin/example/android/gradle/wrapper/gradle-wrapper.properties b/pkgs/jnigen/example/notification_plugin/example/android/gradle/wrapper/gradle-wrapper.properties
index cb24abda1..3c85cfe05 100644
--- a/pkgs/jnigen/example/notification_plugin/example/android/gradle/wrapper/gradle-wrapper.properties
+++ b/pkgs/jnigen/example/notification_plugin/example/android/gradle/wrapper/gradle-wrapper.properties
@@ -2,4 +2,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.4-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-all.zip
diff --git a/pkgs/jnigen/example/notification_plugin/example/android/settings.gradle b/pkgs/jnigen/example/notification_plugin/example/android/settings.gradle
index 536165d35..03e70fe44 100644
--- a/pkgs/jnigen/example/notification_plugin/example/android/settings.gradle
+++ b/pkgs/jnigen/example/notification_plugin/example/android/settings.gradle
@@ -18,7 +18,7 @@ pluginManagement {
 
 plugins {
     id "dev.flutter.flutter-plugin-loader" version "1.0.0"
-    id "com.android.application" version "7.3.0" apply false
+    id "com.android.application" version "8.6.0" apply false
     id "org.jetbrains.kotlin.android" version "1.7.10" apply false
 }
 
diff --git a/pkgs/jnigen/example/pdfbox_plugin/android/build.gradle b/pkgs/jnigen/example/pdfbox_plugin/android/build.gradle
index 6ea97b832..d7c4919c0 100644
--- a/pkgs/jnigen/example/pdfbox_plugin/android/build.gradle
+++ b/pkgs/jnigen/example/pdfbox_plugin/android/build.gradle
@@ -13,6 +13,8 @@ rootProject.allprojects {
 apply plugin: 'com.android.library'
 
 android {
+    namespace 'com.example.pdfbox_plugin'
+
     // Bumping the plugin compileSdkVersion requires all clients of this plugin
     // to bump the version in their app.
     compileSdkVersion 31
diff --git a/pkgs/jnigen/example/pdfbox_plugin/example/android/app/build.gradle b/pkgs/jnigen/example/pdfbox_plugin/example/android/app/build.gradle
index ec6579a75..b1e71c460 100644
--- a/pkgs/jnigen/example/pdfbox_plugin/example/android/app/build.gradle
+++ b/pkgs/jnigen/example/pdfbox_plugin/example/android/app/build.gradle
@@ -23,7 +23,9 @@ if (flutterVersionName == null) {
 }
 
 android {
-    compileSdkVersion flutter.compileSdkVersion
+    namespace "com.example.pdfbox_plugin_example"
+
+    compileSdkVersion 35
     ndkVersion flutter.ndkVersion
 
     compileOptions {
@@ -40,7 +42,6 @@ android {
     }
 
     defaultConfig {
-        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "com.example.pdfbox_plugin_example"
         // You can update the following values to match your application needs.
         // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-build-configuration.
diff --git a/pkgs/jnigen/example/pdfbox_plugin/example/android/gradle/wrapper/gradle-wrapper.properties b/pkgs/jnigen/example/pdfbox_plugin/example/android/gradle/wrapper/gradle-wrapper.properties
index cc5527d78..7aeeb11c6 100644
--- a/pkgs/jnigen/example/pdfbox_plugin/example/android/gradle/wrapper/gradle-wrapper.properties
+++ b/pkgs/jnigen/example/pdfbox_plugin/example/android/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.4-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-all.zip
diff --git a/pkgs/jnigen/example/pdfbox_plugin/example/android/settings.gradle b/pkgs/jnigen/example/pdfbox_plugin/example/android/settings.gradle
index 536165d35..03e70fe44 100644
--- a/pkgs/jnigen/example/pdfbox_plugin/example/android/settings.gradle
+++ b/pkgs/jnigen/example/pdfbox_plugin/example/android/settings.gradle
@@ -18,7 +18,7 @@ pluginManagement {
 
 plugins {
     id "dev.flutter.flutter-plugin-loader" version "1.0.0"
-    id "com.android.application" version "7.3.0" apply false
+    id "com.android.application" version "8.6.0" apply false
     id "org.jetbrains.kotlin.android" version "1.7.10" apply false
 }