Move to Gradle/Maven builds.

* Added a Maven build to the projects.
* Added a Gradle build to the projects.
* Added a GitHub Action to do CI Java builds.
* Restructured the project to follow a similar structure to the
  SpringBoot samples.

Author: SoftlySplinter

.github/workflows/java.yaml

@@ -0,0 +1,85 @@
+name: Build
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["main"]
+  schedule:
+    - cron: '0 0 * * *'
+
+jobs:
+  build-maven:
+    name: Build Maven
+
+    runs-on: ubuntu-latest
+    continue-on-error: ${{ matrix.experimental }}
+    strategy:
+      matrix:
+        jdk: [8, 11]
+        experimental: [false]
+        include:
+          - jdk: 17
+            experimental: true
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up JDK ${{ matrix.jdk }}
+        uses: actions/setup-java@v3
+        with:
+          java-version: ${{ matrix.jdk }}
+          distribution: "semeru"
+          cache: maven
+      - name: Build with Maven
+        run: mvn --batch-mode --update-snapshots --file pom.xml -Djava.version=${{ matrix.jdk }} package
+      - run: mkdir staging && cp cics-java-liberty-link-app/target/*.war staging
+      - uses: actions/upload-artifact@v4
+        with:
+          name: cics-java-liberty-link (Maven, Java ${{ matrix.jdk }})
+          path: staging
+
+  build-mvnw:
+    name: Build Maven Wrapper
+
+    runs-on: ubuntu-latest
+    continue-on-error: ${{ matrix.experimental }}
+    strategy:
+      matrix:
+        jdk: [8, 11]
+        experimental: [false]
+        include:
+          - jdk: 17
+            experimental: true
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up JDK ${{ matrix.jdk }}
+        uses: actions/setup-java@v3
+        with:
+          java-version: ${{ matrix.jdk }}
+          distribution: "semeru"
+          cache: maven
+      - name: Build with Maven
+        run: ./mvnw --batch-mode --update-snapshots --file pom.xml -Djava.version=${{ matrix.jdk }} package
+
+  build-gradle:
+    name: Build Gradle
+    
+    runs-on: ubuntu-latest
+    continue-on-error: ${{ matrix.experimental }}
+    strategy:
+      matrix:
+        jdk: [8, 11]
+        experimental: [false]
+        include:
+          - jdk: 17
+            experimental: true
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up JDK ${{ matrix.jdk }}
+      uses: actions/setup-java@v4
+      with:
+        java-version: ${{ matrix.jdk }}
+        distribution: 'semeru'
+    - name: Build with Gradle
+      uses: gradle/gradle-build-action@bd5760595778326ba7f1441bcf7e88b49de61a25 # v2.6.0
+      with:
+        arguments: build -Pjava_version=${{ matrix.jdk }}

.gitignore

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+# Maven ignores
+target/
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+release.properties
+dependency-reduced-pom.xml
+buildNumber.properties
+.mvn/timing.properties
+# https://github.com/takari/maven-wrapper#usage-without-binary-jar
+.mvn/wrapper/maven-wrapper.jar
+
+# Eclipse m2e generated files
+# Eclipse Core
+.project
+# JDT-specific (Eclipse Java Development Tools)
+.classpath
+
+
+# Gradle ignores
+.gradle
+**/build/
+!src/**/build/
+
+# Ignore Gradle GUI config
+gradle-app.setting
+
+# Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored)
+!gradle-wrapper.jar
+
+# Avoid ignore Gradle wrappper properties
+!gradle-wrapper.properties
+
+# Cache of project
+.gradletasknamecache
+
+# Eclipse Gradle plugin generated files
+# Eclipse Core
+.project
+# JDT-specific (Eclipse Java Development Tools)
+.classpath
+
+
+# Java ignores
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+replay_pid*
+
+
+# VSCode ignores
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+!.vscode/*.code-snippets
+
+# Local History for Visual Studio Code
+.history/
+
+# Built Visual Studio Code Extensions
+*.vsix
+*.vscode