Add support for java.version file

.github/workflows/e2e-versions.yml

@@ -254,4 +254,99 @@ jobs:
         run: bash __tests__/verify-java.sh "${{ matrix.version }}" "${{ steps.setup-java.outputs.path }}"
         shell: bash
 
-  # Only Microsoft provides AArch64. However, GitHub-hosted runners do not support this architecture.
+  setup-java-version-both-version-inputs-presents:
+    name: ${{ matrix.distribution }} version (should be from input) - ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest, windows-latest, ubuntu-latest]
+        distribution: ['temurin', 'adopt', 'adopt-openj9', 'zulu', 'liberica', 'microsoft', 'corretto' ]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Create .java-version file
+        shell: bash
+        run: echo "8" > .java-version
+      - name: setup-java
+        uses: ./
+        id: setup-java
+        with:
+          distribution: ${{ matrix.distribution }}
+          java-version: 11
+          java-version-file: '.java-version'
+      - name: Verify Java
+        run: bash __tests__/verify-java.sh "11" "${{ steps.setup-java.outputs.path }}"
+        shell: bash
+
+  setup-java-version-from-file-major-notation:
+    name: ${{ matrix.distribution }} version from file X - ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest, windows-latest, ubuntu-latest]
+        distribution: ['temurin', 'adopt', 'adopt-openj9', 'zulu', 'liberica', 'microsoft' ]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Create .java-version file
+        shell: bash
+        run: echo "11" > .java-version
+      - name: setup-java
+        uses: ./
+        id: setup-java
+        with:
+          distribution: ${{ matrix.distribution }}
+          java-version-file: '.java-version'
+      - name: Verify Java
+        run: bash __tests__/verify-java.sh "11" "${{ steps.setup-java.outputs.path }}"
+        shell: bash
+
+  setup-java-version-from-file-major-minor-patch-notation:
+    name: ${{ matrix.distribution }} version from file X.Y.Z - ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest, windows-latest, ubuntu-latest]
+        distribution: [ 'adopt', 'adopt-openj9', 'zulu' ]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Create .java-version file
+        shell: bash
+        run: echo "11.0.2" > .java-version
+      - name: setup-java
+        uses: ./
+        id: setup-java
+        with:
+          distribution: ${{ matrix.distribution }}
+          java-version-file: '.java-version'
+      - name: Verify Java
+        run: bash __tests__/verify-java.sh "11.0.2" "${{ steps.setup-java.outputs.path }}"
+        shell: bash
+
+  setup-java-version-from-file-major-minor-patch-with-dist:
+    name: ${{ matrix.distribution }} version from file 'openjdk64-11.0.2' - ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest, windows-latest, ubuntu-latest]
+        distribution: ['adopt', 'adopt-openj9', 'zulu', 'liberica',  ]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Create .java-version file
+        shell: bash
+        run: echo "openjdk64-11.0.2" > .java-version
+      - name: setup-java
+        uses: ./
+        id: setup-java
+        with:
+          distribution: ${{ matrix.distribution }}
+          java-version-file: '.java-version'
+      - name: Verify Java
+        run: bash __tests__/verify-java.sh "11.0.2" "${{ steps.setup-java.outputs.path }}"
+        shell: bash

README.md

@@ -23,7 +23,9 @@ This action allows you to work with Java and Scala projects.
 
 ## Usage
 
-  - `java-version`: _(required)_ The Java version to set up. Takes a whole or [semver](#supported-version-syntax) Java version.
+  - `java-version`: The Java version to set up. Takes a whole or [semver](#supported-version-syntax) Java version. If not specified, the action will expect `java-version-file` input to be specified.
+
+  - `java-version-file`: The path to the `.java-version` file. See more details in [about `.java-version` file](docs/advanced-usage.md#Java-version-file).
 
   - `distribution`: _(required)_ Java [distribution](#supported-distributions).
 

action.yml

@@ -5,7 +5,8 @@ author: 'GitHub'
 inputs:
   java-version:
     description: 'The Java version to set up. Takes a whole or semver Java version. See examples of supported syntax in README file'
-    required: true
+  java-version-file:
+    description: 'The path to the `.java-version` file. See examples of supported syntax in README file'
   distribution:
     description: 'Java distribution. See the list of supported distributions in README file'
     required: true