Switch to JDK 18 as minumum supported version (#29)

* Drop minimum supported JDK version to 18

Set up matrix build, for versions 18 to 21

* Drop publish to JDK 18 and don't require adoptium

* Update README.md

Author: deejay1

.github/workflows/ci.yml

@@ -6,16 +6,20 @@ jobs:
   build:
     runs-on: ubuntu-latest
 
+    strategy:
+      matrix:
+        version: [ 18, 19, 20, 21 ]
+
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - uses: gradle/wrapper-validation-action@v1
 
-      - name: Set up JDK 20
+      - name: Set up JDK ${{ matrix.version }}
         uses: actions/setup-java@v3
         with:
           distribution: temurin
-          java-version: 20
+          java-version: ${{ matrix.version }}
 
       - name: Setup Gradle
         uses: gradle/gradle-build-action@v2

.github/workflows/publish.yml

@@ -13,15 +13,15 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - uses: gradle/wrapper-validation-action@v1
 
-      - name: Set up JDK 20
+      - name: Set up JDK 18
         uses: actions/setup-java@v3
         with:
           distribution: temurin
-          java-version: 20
+          java-version: 18
 
       - name: Setup Gradle
         uses: gradle/gradle-build-action@v2

README.md

@@ -47,7 +47,7 @@ Please remember about specifying the desired version.
 Note that simdjson-java follows the [SemVer specification](https://semver.org/), which means, for example, that a major 
 version of zero indicates initial development, so the library's API should not be considered stable.
 
-We require Java 20 or better.
+We require Java 18 or better.
 
 ## Benchmarks
 
@@ -87,4 +87,4 @@ To reproduce the benchmark results, execute the following command:
 
 ```./gradlew jmh -Pjmh.includes='.*ParseAndSelectBenchmark.*'```
 
-The benchmark may take several minutes. Remember that you need Java 20 or better.
+The benchmark may take several minutes. Remember that you need Java 18 or better.

build.gradle

@@ -2,14 +2,13 @@ import me.champeau.jmh.JmhBytecodeGeneratorTask
 import org.gradle.internal.os.OperatingSystem
 import org.ajoberstar.grgit.Grgit
 import java.time.Duration
-import jdk.incubator.vector.ByteVector
 
 plugins {
     id 'java'
     id 'scala'
     id 'me.champeau.jmh' version '0.7.1'
     id 'org.ajoberstar.grgit' version '5.2.0'
-    id 'pl.allegro.tech.build.axion-release' version '1.15.4'
+    id 'pl.allegro.tech.build.axion-release' version '1.15.5'
     id 'io.github.gradle-nexus.publish-plugin' version '1.3.0'
     id 'maven-publish'
     id 'signing'
@@ -31,7 +30,7 @@ repositories {
 
 java {
     toolchain {
-        languageVersion = JavaLanguageVersion.of(20)
+        languageVersion = JavaLanguageVersion.of(18)
     }
     withJavadocJar()
     withSourcesJar()

gradle/wrapper/gradle-wrapper.jar

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.2-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.4-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME

gradle/wrapper/gradle-wrapper.properties

@@ -1 +1,5 @@
+plugins {
+    id("org.gradle.toolchains.foojay-resolver-convention") version "0.7.0"
+}
+
 rootProject.name = 'simdjson-java'