Updated DEVELOPER_GUIDE.md and workflows to reference changes to the supported JDKs.

.github/workflows/multi-node-test-workflow.yml

@@ -12,7 +12,7 @@ jobs:
   build:
     strategy:
       matrix:
-        java: [ 14 ]
+        java: [ 11 ]
     # Job name
     name: Build and test Alerting
     # This job runs on Linux
@@ -26,10 +26,5 @@ jobs:
       # This step uses the checkout Github action: https://github.com/actions/checkout
       - name: Checkout Branch
         uses: actions/checkout@v2
-      # This step uses the setup-java Github action: https://github.com/actions/setup-java
-      - name: Set Up JDK 14
-        uses: actions/setup-java@v1
-        with:
-          java-version: 14
       - name: Run integration tests with multi node config
         run: ./gradlew integTest -PnumNodes=3 -Dopensearch.version=1.3.0-SNAPSHOT

.github/workflows/security-test-workflow.yml

@@ -12,7 +12,7 @@ jobs:
   build:
     strategy:
       matrix:
-        java: [ 14 ]
+        java: [ 11 ]
     # Job name
     name: Build and test Alerting
     # This job runs on Linux
@@ -27,10 +27,10 @@ jobs:
       - name: Checkout Branch
         uses: actions/checkout@v2
       # This step uses the setup-java Github action: https://github.com/actions/setup-java
-      - name: Set Up JDK 14
+      - name: Set Up JDK 11
         uses: actions/setup-java@v1
         with:
-          java-version: 14
+          java-version: 11
       - name: Build Alerting
         # Only assembling since the full build is governed by other workflows
         run: ./gradlew assemble -Dopensearch.version=1.3.0-SNAPSHOT

DEVELOPER_GUIDE.md

@@ -1,6 +1,7 @@
 - [Developer Guide](#developer-guide)
   - [Forking and Cloning](#forking-and-cloning)
   - [Install Prerequisites](#install-prerequisites)
+    - [JDK 11](#jdk-11)
     - [JDK 14](#jdk-14)
   - [Setup](#setup)
   - [Build](#build)
@@ -18,14 +19,32 @@ Fork this repository on GitHub, and clone locally with `git clone`.
 
 ### Install Prerequisites
 
+#### JDK 11
+
+OpenSearch builds using Java 11 at a minimum, using the Adoptium distribution. This means you must have a JDK 11 installed with the environment variable `JAVA_HOME` referencing the path to Java home for your JDK 11 installation, e.g. `JAVA_HOME=/usr/lib/jvm/jdk-11`. This is configured in [buildSrc/build.gradle](buildSrc/build.gradle) and [distribution/tools/java-version-checker/build.gradle](distribution/tools/java-version-checker/build.gradle).
+
+```
+allprojects {
+  targetCompatibility = JavaVersion.VERSION_11
+  sourceCompatibility = JavaVersion.VERSION_11
+}
+```
+
+```
+sourceCompatibility = JavaVersion.VERSION_11
+targetCompatibility = JavaVersion.VERSION_11
+```
+
+Download Java 11 from [here](https://adoptium.net/releases.html?variant=openjdk11).
+
 #### JDK 14
 
-OpenSearch components build using Java 14 at a minimum. This means you must have a JDK 14 installed with the environment variable `JAVA_HOME` referencing the path to Java home for your JDK 14 installation, e.g. `JAVA_HOME=/usr/lib/jvm/jdk-14`.
+To run the full suite of tests, download and install [JDK 14](https://jdk.java.net/archive/) and set `JAVA11_HOME`, and `JAVA14_HOME`. They are required by the [backwards compatibility test](./TESTING.md#testing-backwards-compatibility).
 
 ### Setup
 
 1. Clone the repository (see [Forking and Cloning](#forking-and-cloning))
-2. Make sure `JAVA_HOME` is pointing to a Java 14 JDK (see [Install Prerequisites](#install-prerequisites))
+2. Make sure `JAVA_HOME` is pointing to a Java 11 JDK (see [Install Prerequisites](#install-prerequisites))
 3. Launch Intellij IDEA, Choose Import Project and select the settings.gradle file in the root of this package.
 
 ### Build

release-notes/opensearch-alerting.release-notes-1.3.0.0.md

@@ -11,4 +11,5 @@ Compatible with OpenSearch 1.3.0
 * Fix running Alerting security tests in GitHub Actions. ([#252](https://github.com/opensearch-project/alerting/pull/252))
 
 ### Documentation
-* Added 1.3 release notes. ([#336](https://github.com/opensearch-project/alerting/pull/336))
+* Added 1.3 release notes. ([#336](https://github.com/opensearch-project/alerting/pull/336))
+* Updated DEVELOPER_GUIDE.md to reference changes to the supported JDKs. ([#338](https://github.com/opensearch-project/alerting/pull/338))