Require Java 11, test against 21

.github/workflows/ci.yml

@@ -9,15 +9,16 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java: [9, 11, 17]
+        java: [11, 17, 21]
     steps:
       - name: Checkout sources
         uses: actions/checkout@v2
 
       - name: Set up JDK
-        uses: actions/setup-java@v1
+        uses: actions/setup-java@v4
         with:
           java-version: ${{ matrix.java }}
+          distribution: 'zulu'
 
       - name: Build
         run: mvn -B package
@@ -29,9 +30,10 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Set up JDK
-        uses: actions/setup-java@v1
+        uses: actions/setup-java@v4
         with:
-          java-version: 17
+          java-version: 21
+          distribution: 'zulu'
 
       - name: Build with coverage
         run: mvn -B -Pcoverage clean test jacoco:report

CHANGELOG.md

@@ -5,6 +5,9 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+- Require at least Java 11
+
 ## [0.11.0] - 2023-02-27
 ### Changed
 - Modular JAR: Require at least Java 9 and add a module descriptor (module-info),

README.md

@@ -32,7 +32,7 @@ Thanks to [Rinku](https://github.com/vmg/rinku) for the inspiration.
 Usage
 -----
 
-This library is supported on Java 9 or later. It works on Android
+This library is supported on Java 11 or later. It works on Android
 (minimum API level 19). It has no external dependencies.
 
 Maven coordinates

pom.xml

@@ -38,10 +38,9 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.10.1</version>
+                <version>3.12.1</version>
                 <configuration>
-                    <source>9</source>
-                    <target>9</target>
+                    <release>11</release>
                 </configuration>
             </plugin>
             <plugin>