Drop support for JDK 8

.github/workflows/maven.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java: [8, 11, 17]
+        java: [11, 17, 21]
 
     steps:
     - uses: actions/checkout@v2

README.md

@@ -24,7 +24,8 @@ Used in production at the National Library of Australia and British Library with
 Installing
 ----------
 
-OutbackCDX requires [JDK 8 and 11](https://adoptopenjdk.net/) on x86-64 Linux, Windows or MacOS (other platforms would require a custom build of RocksDB JNI).
+OutbackCDX requires [JDK 11](https://adoptopenjdk.net/) (or newer) on Linux, Windows or MacOS (other platforms 
+may be possible with a custom build of RocksDB JNI).
 
 Pre-compiled jar packages are available from the [releases page](https://github.com/nla/outbackcdx/releases).
 

pom.xml

@@ -10,22 +10,11 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <maven.compiler.source>1.8</maven.compiler.source>
-        <maven.compiler.target>1.8</maven.compiler.target>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+        <maven.compiler.release>11</maven.compiler.release>
     </properties>
 
-    <profiles>
-        <profile>
-            <id>release-8</id>
-            <activation>
-                <jdk>[9,)</jdk>
-            </activation>
-            <properties>
-                <maven.compiler.release>8</maven.compiler.release>
-            </properties>
-        </profile>
-    </profiles>
-
     <build>
         <sourceDirectory>${basedir}/src</sourceDirectory>
         <testSourceDirectory>${basedir}/test</testSourceDirectory>