chore(ci): CI with multiply java versions in CI/GitHub actions

- build by java high version
- and run test by java low versions

.github/workflows/maven.yml

@@ -1,5 +1,8 @@
-# This workflow will build a Java project with Maven
-# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-maven
+# Quickstart for GitHub Actions
+# https://docs.github.com/en/actions/quickstart
+#
+# For more information about the workflow to build a Java project with Maven, see:
+# https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-maven
 
 name: Java CI with Maven
 
@@ -8,21 +11,41 @@ on:
     branches: [ master ]
   pull_request:
     branches: [ master ]
+  # https://docs.github.com/en/actions/using-workflows/manually-running-a-workflow
+  workflow_dispatch:
 
 jobs:
   build:
 
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        os: [ ubuntu-latest ]
-        java-version: [ 11.0.3, 11 ]
+    timeout-minutes: 20
+    name: CI with multiply java versions
+
     steps:
-    - uses: actions/checkout@v2
-    - name: Set up JDK ${{ matrix.java-version }}
-      uses: actions/setup-java@v2
-      with:
-        java-version: ${{ matrix.java-version }}
-        distribution: 'zulu'
-    - name: Build with Maven
-      run: mvn -B package --file pom.xml
+      - uses: actions/checkout@v4
+      ##################################################
+      # Set up multiply java versions
+      ##################################################
+      - name: Set up java versions
+        uses: actions/setup-java@v4
+        with:
+          # https://github.com/actions/setup-java?tab=readme-ov-file#install-multiple-jdks
+          #
+          # CAUTION:
+          #   do NOT move specified old version `11.0.3` before version `11`,
+          #   or the version `11.0.3` will not be installed!
+          #   because the old version 11.0.3 satisfies the version 11.
+          java-version: |
+            8
+            11
+            11.0.3
+            17
+            21
+          distribution: zulu
+          cache: maven
+
+      ##################################################
+      # CI/Build
+      ##################################################
+      - name: Run integration test with multiply java versions
+        run: scripts/integration-test.sh

scripts/integration-test.sh

@@ -0,0 +1,199 @@
+#!/bin/bash
+set -eEuo pipefail
+cd -P -- "$(dirname -- "$(readlink -f -- "$0")")"/..
+
+################################################################################
+# common util functions
+################################################################################
+
+color_print() {
+  local color=$1
+  shift
+
+  # if stdout is terminal or running on GitHub Actions, turn on color output.
+  #
+  # about env var GITHUB_ACTIONS of GitHub Actions:
+  #   Always set to true when GitHub Actions is running the workflow.
+  #   You can use this variable to differentiate when tests are being run locally or by GitHub Actions.
+  #   https://docs.github.com/en/actions/learn-github-actions/variables#default-environment-variables
+  if [[ -t 1 || "${GITHUB_ACTIONS:-}" = true ]]; then
+    printf "\e[1;${color}m%s\e[0m\n" "$*"
+  else
+    printf '%s\n' "$*"
+  fi
+}
+
+info_print() {
+  # blue text color
+  color_print 36 "$@"
+}
+
+warn_print() {
+  # yellow text color
+  color_print 33 "$@"
+}
+
+error_print() {
+  # red text color
+  color_print 31 "$@"
+}
+
+head_line_print() {
+  color_print "2;35;46" ================================================================================
+  warn_print "$*"
+  color_print "2;35;46" ================================================================================
+}
+
+die() {
+  error_print "Error: $*" >&2
+  exit 1
+}
+
+################################################################################
+# CI helper functions
+################################################################################
+
+switch_to_jdk_home() {
+  export JAVA_HOME="$1"
+  [ -x "$JAVA_HOME/bin/java" ] ||
+    die "JAVA_HOME($JAVA_HOME) is invalid: \$JAVA_HOME/bin/java is not existed or executable!"
+}
+
+# The normalized JAVA_HOME env vars of the specified java versions
+# are like JAVA8_HOME, JAVA21_HOME, etc.
+#
+# You can set the normalized JAVA_HOME env vars locally,
+# then run this integration test script locally.
+#
+# Below function will detect JAVA_HOME vars when running on GitHub Actions,
+# and set the normalized JAVA_HOME env vars.
+__detect_java_homes_and_set_when_running_on_github_actions() {
+  [[ "${GITHUB_ACTIONS:-}" = true ]] || return 0
+
+  local jh_name matched_version jh expr detected=()
+
+  # the JAVA_HOME env vars introduced by `actions/setup-java@v4`, e.g.
+  #   JAVA_HOME_8_X64: /opt/hostedtoolcache/Java_Zulu_jdk/8.0.392-8/x64
+  #   JAVA_HOME_21_X64: /opt/hostedtoolcache/Java_Zulu_jdk/21.0.1-12/x64
+  for jh_name in "${!JAVA_HOME_@}"; do
+    [[ "$jh_name" =~ ^JAVA_HOME_([0-9]+)_ ]] || continue
+    matched_version="${BASH_REMATCH[1]}"
+
+    jh="${!jh_name:-}"
+    [ -d "$jh" ] || continue
+
+    printf -v expr 'JAVA%q_HOME=%q' "$matched_version" "$jh"
+    detected=(${detected[@]:+"${detected[@]}"} "$expr")
+  done
+
+  (("${#detected[@]}" > 0)) || return 0
+  warn_print "Detected JAVA_HOME when running on GitHub Actions:"
+  for expr in "${detected[@]}"; do
+    # shellcheck disable=SC2163
+    export "$expr"
+    echo "  export $expr"
+  done
+}
+__detect_java_homes_and_set_when_running_on_github_actions
+
+__find_latest_specified_java_version_and_export() {
+  local specified_java_version="$1"
+  local major_version="${specified_java_version%%.*}"
+
+  local reference_jh_var_name="JAVA${major_version}_HOME"
+  local reference_dir=${!reference_jh_var_name}
+  reference_dir="${reference_dir%/}" # remove tailing slash
+
+  local bkp_shopt_null_glob=0
+  shopt -q nullglob && bkp_shopt_null_glob=1
+  shopt -s nullglob
+
+  local found_arr found
+  if [ "${GITHUB_ACTIONS:-}" = true ]; then
+    # the JAVA_HOME env vars introduced by `actions/setup-java@v4`, e.g.
+    #   JAVA_HOME_8_X64: /opt/hostedtoolcache/Java_Zulu_jdk/8.0.392-8/x64
+    #   JAVA_HOME_21_X64: /opt/hostedtoolcache/Java_Zulu_jdk/21.0.1-12/x64
+    local extra_child_dir_name="${reference_dir##*/}" # get basename, e.g. "x64"
+    found_arr=(
+      "$reference_dir/../../$specified_java_version"-*/
+      "$reference_dir/../../$specified_java_version".*/
+    )
+  else
+    found_arr=(
+      "$JAVA11_HOME/../$specified_java_version".*/
+      "$JAVA11_HOME/../$specified_java_version"-*/
+    )
+  fi
+
+  ((${#found_arr[@]} > 0)) || die "Fail to find java home for version $specified_java_version!"
+
+  if ((${#found_arr[@]} > 1)); then
+    # TODO `ls -v` is not robust, but it works for now.
+    # shellcheck disable=SC2012
+    found="$(ls -v -d "${found_arr[@]}" | tail -n 1)"
+  else
+    found="${found_arr[0]}"
+  fi
+  found="$(cd "$found" && pwd)" # normalize path
+
+  if [ "${GITHUB_ACTIONS:-}" = true ]; then
+    found="${found}/$extra_child_dir_name"
+  fi
+
+  ((${#found_arr[@]} == 1)) || echo "Found multiply java homes for the specified java version $specified_java_version: ${found_arr[*]}; use the last one"
+
+  local expr
+  printf -v expr 'JAVA%q_HOME=%q' "${specified_java_version//./_}" "$found"
+  # shellcheck disable=SC2163
+  export "$expr"
+  warn_print "Found the specified java version($specified_java_version): export $expr"
+
+  # restore null glob shopt
+  [ "$bkp_shopt_null_glob" -eq 0 ] && shopt -u nullglob
+}
+
+__find_latest_specified_java_version_and_export 11.0.3
+# correct the latest version of java 11 back;
+# because actions/setup-java set up 2 versions of java 11 and last old version wins in `JAVA11_HOME`.
+__find_latest_specified_java_version_and_export 11
+
+################################################################################
+# CI build logic
+################################################################################
+
+# shellcheck disable=SC2153
+readonly default_build_jdk_home="$JAVA21_HOME"
+readonly JDK_HOMES=(
+  "$JAVA8_HOME"
+  "$JAVA11_0_3_HOME"
+  "$JAVA11_HOME"
+  "$JAVA17_HOME"
+  "$default_build_jdk_home"
+)
+
+##################################################
+# do build and test by default version jdk
+##################################################
+
+switch_to_jdk_home "$default_build_jdk_home"
+
+head_line_print "build and test with Java: $JAVA_HOME"
+# `-V`: show the java version info (essential info when test multiple java versions)
+# `--no-transfer-progress`: disable the (chatty) transfer progress when downloading or uploading
+mvn -V --no-transfer-progress clean package
+
+##################################################
+# test by multiply java versions
+##################################################
+
+for jdk_version in "${JDK_HOMES[@]}"; do
+  if [ "$jdk_version" == "$default_build_jdk_home" ]; then
+    # skip default jdk, already tested above
+    continue
+  fi
+
+  switch_to_jdk_home "$jdk_version"
+
+  head_line_print "test with Java: $JAVA_HOME"
+  mvn -V --no-transfer-progress surefire:test
+done