Test if the KS runtime lib .jar is runnable across Java versions

See kaitai-io/kaitai_struct_java_runtime#34

Author: generalmimon

.github/workflows/maven.yml

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+name: Java CI with Maven
+
+on:
+  push:
+    branches:
+      - master
+  pull_request: {}
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        ks-java-runtime-lib-ref:
+          - '' # the default branch
+          - 'build-for-java-7'
+        java-version:
+          - '8'
+          - '11'
+          - '17'
+
+    steps:
+      - name: Checkout the KS runtime lib for Java
+        uses: actions/checkout@v3
+        with:
+          repository: 'kaitai-io/kaitai_struct_java_runtime'
+          ref: ${{ matrix.ks-java-runtime-lib-ref }}
+      - name: Set up JDK
+        uses: actions/setup-java@v3
+        with:
+          java-version: ${{ matrix.java-version }}
+          distribution: 'temurin'
+      - name: Build with Maven
+        run: mvn -B package --file pom.xml
+      - uses: actions/upload-artifact@v3
+        with:
+          name: ks-runtime-built-by-${{ matrix.java-version }}
+          path: target/kaitai-struct-runtime-0.9.jar
+
+  run:
+    runs-on: ubuntu-latest
+    needs:
+      - build
+    strategy:
+      fail-fast: false
+      matrix:
+        built-by-java-version:
+          - '8'
+          - '11'
+          - '17'
+        java-version:
+          - '8'
+          - '11'
+          - '17'
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up JDK
+        uses: actions/setup-java@v3
+        with:
+          java-version: ${{ matrix.java-version }}
+          distribution: 'temurin'
+      - uses: actions/download-artifact@v3
+        with:
+          name: ks-runtime-built-by-${{ matrix.built-by-java-version }}
+      - name: Compile
+        run: javac -encoding UTF-8 -cp kaitai-struct-runtime-0.9.jar -d bin *.java
+      - name: Run
+        run: java -cp 'bin:kaitai-struct-runtime-0.9.jar' App

.gitignore

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+/bin
+*.class

App.java

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+import io.kaitai.struct.ByteBufferKaitaiStream;
+import java.io.IOException;
+
+public class App {
+	public static void main(String[] args) throws IOException {
+    byte[] data = { (byte) 0xd4 };
+        HelloWorld hw = new HelloWorld(new ByteBufferKaitaiStream(data));
+
+        System.out.println("one: " + hw.one());
+        if (hw.one() == 212) {
+            System.out.println("OK");
+        } else {
+            System.out.println("Error");
+            System.exit(1);
+        }
+    }
+}

HelloWorld.java

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+// This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
+
+import io.kaitai.struct.ByteBufferKaitaiStream;
+import io.kaitai.struct.KaitaiStruct;
+import io.kaitai.struct.KaitaiStream;
+import java.io.IOException;
+
+public class HelloWorld extends KaitaiStruct {
+    public static HelloWorld fromFile(String fileName) throws IOException {
+        return new HelloWorld(new ByteBufferKaitaiStream(fileName));
+    }
+
+    public HelloWorld(KaitaiStream _io) {
+        this(_io, null, null);
+    }
+
+    public HelloWorld(KaitaiStream _io, KaitaiStruct _parent) {
+        this(_io, _parent, null);
+    }
+
+    public HelloWorld(KaitaiStream _io, KaitaiStruct _parent, HelloWorld _root) {
+        super(_io);
+        this._parent = _parent;
+        this._root = _root == null ? this : _root;
+        _read();
+    }
+    private void _read() {
+        this.one = this._io.readU1();
+    }
+    private int one;
+    private HelloWorld _root;
+    private KaitaiStruct _parent;
+    public int one() { return one; }
+    public HelloWorld _root() { return _root; }
+    public KaitaiStruct _parent() { return _parent; }
+}

hello_world.ksy

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+meta:
+  id: hello_world
+seq:
+  - id: one
+    type: u1