Merge pull request #314 from graalvm/ni-demos-refactoring-11

[GR-60094] Add demo for Specify Class Initialization Explicitly guide.

Author: olyagpl

.github/workflows/native-image-specify-class-init.yml

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+name: native-image/specify-class-init
+on:
+  push:
+    paths:
+      - 'native-image/specify-class-init/**'
+      - '.github/workflows/native-image-specify-class-init.yml'
+  pull_request:
+    paths:
+      - 'native-image/specify-class-init/**'
+      - '.github/workflows/native-image-specify-class-init.yml'
+  schedule:
+    - cron: "0 0 1 * *" # run every month
+  workflow_dispatch:
+permissions:
+  contents: read
+jobs:
+  run:
+    name: Run 'native-image/specify-class-init'
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    strategy:
+      matrix:
+        java-version: ['21', '24-ea']
+    steps:
+      - uses: actions/checkout@v4
+      - uses: graalvm/setup-graalvm@v1
+        with:
+          java-version: ${{ matrix.java-version }}
+          distribution: 'graalvm'
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          native-image-job-reports: 'true'
+      - name: Run 'native-image/specify-class-init'
+        run: |
+          cd native-image/specify-class-init
+          ./run.sh

native-image/specify-class-init/.gitignore

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+.class
+buildtime-parser
+runtime-parser

native-image/specify-class-init/README.md

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+# Specify Class Initialization Explicitly
+
+You can find the steps to run this demo on [the website](https://www.graalvm.org/jdk23/reference-manual/native-image/guides/specify-class-initialization/).

native-image/specify-class-init/TalkParser.java

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+/*
+ * Copyright (c) 2024, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * The Universal Permissive License (UPL), Version 1.0
+ *
+ * Subject to the condition set forth below, permission is hereby granted to any
+ * person obtaining a copy of this software, associated documentation and/or
+ * data (collectively the "Software"), free of charge and under any and all
+ * copyright rights in the Software, and any and all patent rights owned or
+ * freely licensable by each licensor hereunder covering either (i) the
+ * unmodified Software as contributed to or provided by such licensor, or (ii)
+ * the Larger Works (as defined below), to deal in both
+ *
+ * (a) the Software, and
+ *
+ * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
+ * one is included with the Software each a "Larger Work" to which the Software
+ * is contributed by such licensors),
+ *
+ * without restriction, including without limitation the rights to copy, create
+ * derivative works of, display, perform, and distribute the Software and make,
+ * use, sell, offer for sale, import, export, have made, and have sold the
+ * Software and the Larger Work(s), and to sublicense the foregoing rights on
+ * either these or other terms.
+ *
+ * This license is subject to the following condition:
+ *
+ * The above copyright notice and either this complete permission notice or at a
+ * minimum a reference to the UPL must be included in all copies or substantial
+ * portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Scanner;
+
+public class TalkParser {
+private static final List<Talk> TALKS = new ArrayList<>();
+static {
+    Scanner s = new Scanner("""
+        Asynchronous Programming in Java: Options to Choose from by Venkat Subramaniam
+        Anatomy of a Spring Boot App with Clean Architecture by Steve Pember
+        Java in the Cloud with GraalVM by Alina Yurenko
+        Bootiful Spring Boot 3 by Josh Long
+        """);
+    while (s.hasNextLine()) {
+    TALKS.add(new Talk(s.nextLine()));
+    }
+    s.close();
+}
+
+public static void main(String[] args) {
+    System.out.println("Talks loaded using scanner:");
+    for (Talk talk : TALKS) {
+        System.out.println("- " + talk.name());
+        }
+    }
+}
+
+record Talk (String name) {}

native-image/specify-class-init/run.sh

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+#!/usr/bin/env bash
+set -ex
+
+javac TalkParser.java
+native-image -Ob -o runtime-parser TalkParser
+time ./runtime-parser
+du -sh runtime-parser
+native-image -Ob --initialize-at-build-time=TalkParser,Talk -o buildtime-parser TalkParser
+time ./buildtime-parser
+du -sh buildtime-parser