From cf9d3dbe993a1482679d9d60c79c0e9839829b52 Mon Sep 17 00:00:00 2001
From: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Date: Mon, 15 Jun 2026 21:55:56 +0000
Subject: [PATCH 1/5] feature(build): target Java 11 via release; jar
 packaging; modern plugins

- maven-compiler-plugin 3.11.0 with <release>11</release>, -Xlint:all -Werror
- surefire/failsafe 3.2.5, javadoc 3.6.3, enforcer 3.5.0 requireJavaVersion [11,)
- packaging pom -> jar so sources compile and repackage on JDK 11
- upgrade Maven wrapper 3.3.9 -> 3.9.9

Co-Authored-By: derek.wu <derekwu35@gmail.com>
---
 .mvn/wrapper/maven-wrapper.properties         |   3 +-
 mvnw                                          |   0
 pom.xml                                       |  71 +++++++++++++++++-
 target/classes/hello/Application.class        | Bin 6460 -> 0 bytes
 .../hello/controller/GreetingController.class | Bin 1219 -> 0 bytes
 .../hello/controller/HelloController.class    | Bin 4496 -> 0 bytes
 .../hello/controller/TopicController.class    | Bin 2344 -> 0 bytes
 .../hello/declaration/CustomPredicate.class   | Bin 248 -> 0 bytes
 .../hello/declaration/TimeClient.class        | Bin 1383 -> 0 bytes
 target/classes/hello/model/Customer.class     | Bin 1407 -> 0 bytes
 target/classes/hello/model/Greeting.class     | Bin 588 -> 0 bytes
 target/classes/hello/model/Quote.class        | Bin 1128 -> 0 bytes
 .../hello/model/SimpleTimeClient.class        | Bin 1720 -> 0 bytes
 target/classes/hello/model/Topic.class        | Bin 1121 -> 0 bytes
 target/classes/hello/model/Value.class        | Bin 1111 -> 0 bytes
 .../classes/hello/service/TopicService.class  | Bin 13054 -> 0 bytes
 target/classes/public/index.html              |  10 ---
 17 files changed, 70 insertions(+), 14 deletions(-)
 mode change 100644 => 100755 mvnw
 delete mode 100644 target/classes/hello/Application.class
 delete mode 100644 target/classes/hello/controller/GreetingController.class
 delete mode 100644 target/classes/hello/controller/HelloController.class
 delete mode 100644 target/classes/hello/controller/TopicController.class
 delete mode 100644 target/classes/hello/declaration/CustomPredicate.class
 delete mode 100644 target/classes/hello/declaration/TimeClient.class
 delete mode 100644 target/classes/hello/model/Customer.class
 delete mode 100644 target/classes/hello/model/Greeting.class
 delete mode 100644 target/classes/hello/model/Quote.class
 delete mode 100644 target/classes/hello/model/SimpleTimeClient.class
 delete mode 100644 target/classes/hello/model/Topic.class
 delete mode 100644 target/classes/hello/model/Value.class
 delete mode 100644 target/classes/hello/service/TopicService.class
 delete mode 100644 target/classes/public/index.html

diff --git a/.mvn/wrapper/maven-wrapper.properties b/.mvn/wrapper/maven-wrapper.properties
index c954cec..75249eb 100644
--- a/.mvn/wrapper/maven-wrapper.properties
+++ b/.mvn/wrapper/maven-wrapper.properties
@@ -1 +1,2 @@
-distributionUrl=https://repo1.maven.org/maven2/org/apache/maven/apache-maven/3.3.9/apache-maven-3.3.9-bin.zip
+distributionUrl=https://repo1.maven.org/maven2/org/apache/maven/apache-maven/3.9.9/apache-maven-3.9.9-bin.zip
+wrapperUrl=https://repo1.maven.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.3.2/maven-wrapper-3.3.2.jar
diff --git a/mvnw b/mvnw
old mode 100644
new mode 100755
diff --git a/pom.xml b/pom.xml
index 63f5cbd..89d5894 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,7 +5,7 @@
 
     <groupId>org.springframework</groupId>
     <artifactId>gs-spring-boot</artifactId>
-    <packaging>pom</packaging>
+    <packaging>jar</packaging>
     <version>0.1.0</version>
 
     <parent>
@@ -32,19 +32,84 @@
             <groupId>com.h2database</groupId>
             <artifactId>h2</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <properties>
-        <java.version>1.8</java.version>
+        <maven.compiler.release>11</maven.compiler.release>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
     </properties>
 
-
     <build>
         <plugins>
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.11.0</version>
+                <configuration>
+                    <release>11</release>
+                    <compilerArgs>
+                        <arg>-Xlint:all</arg>
+                        <arg>-Werror</arg>
+                    </compilerArgs>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>3.2.5</version>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-failsafe-plugin</artifactId>
+                <version>3.2.5</version>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>integration-test</goal>
+                            <goal>verify</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-javadoc-plugin</artifactId>
+                <version>3.6.3</version>
+                <configuration>
+                    <doclint>none</doclint>
+                    <additionalOptions>-Xdoclint:none</additionalOptions>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-enforcer-plugin</artifactId>
+                <version>3.5.0</version>
+                <executions>
+                    <execution>
+                        <id>enforce-java-11</id>
+                        <goals>
+                            <goal>enforce</goal>
+                        </goals>
+                        <configuration>
+                            <rules>
+                                <requireJavaVersion>
+                                    <version>[11,)</version>
+                                </requireJavaVersion>
+                            </rules>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
     </build>
 
diff --git a/target/classes/hello/Application.class b/target/classes/hello/Application.class
deleted file mode 100644
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GIT binary patch
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diff --git a/target/classes/hello/controller/GreetingController.class b/target/classes/hello/controller/GreetingController.class
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diff --git a/target/classes/hello/controller/HelloController.class b/target/classes/hello/controller/HelloController.class
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diff --git a/target/classes/hello/controller/TopicController.class b/target/classes/hello/controller/TopicController.class
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index c32cad52bd3bc94478f99d074f9951344f506297..0000000000000000000000000000000000000000
GIT binary patch
literal 0
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diff --git a/target/classes/hello/declaration/CustomPredicate.class b/target/classes/hello/declaration/CustomPredicate.class
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GIT binary patch
literal 0
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diff --git a/target/classes/hello/declaration/TimeClient.class b/target/classes/hello/declaration/TimeClient.class
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GIT binary patch
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diff --git a/target/classes/hello/model/Customer.class b/target/classes/hello/model/Customer.class
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GIT binary patch
literal 0
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diff --git a/target/classes/hello/model/Greeting.class b/target/classes/hello/model/Greeting.class
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GIT binary patch
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diff --git a/target/classes/hello/model/Quote.class b/target/classes/hello/model/Quote.class
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GIT binary patch
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diff --git a/target/classes/hello/model/SimpleTimeClient.class b/target/classes/hello/model/SimpleTimeClient.class
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GIT binary patch
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diff --git a/target/classes/hello/model/Topic.class b/target/classes/hello/model/Topic.class
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index 3a53aa594c0ee55af4f45e9b78ee907b17a8c4ad..0000000000000000000000000000000000000000
GIT binary patch
literal 0
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diff --git a/target/classes/hello/model/Value.class b/target/classes/hello/model/Value.class
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GIT binary patch
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diff --git a/target/classes/hello/service/TopicService.class b/target/classes/hello/service/TopicService.class
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GIT binary patch
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diff --git a/target/classes/public/index.html b/target/classes/public/index.html
deleted file mode 100644
index 566549b..0000000
--- a/target/classes/public/index.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<html lang="en">
-<head>
-    <meta charset="UTF-8">
-    <title>Title</title>
-</head>
-<body>
-
-</body>
-</html>
\ No newline at end of file

From 662d1424ededb2346bf7a90fff3cd4e281c90859 Mon Sep 17 00:00:00 2001
From: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Date: Mon, 15 Jun 2026 21:55:59 +0000
Subject: [PATCH 2/5] feature(gradle): target Java 11 toolchain; wrapper 6.9.4;
 jdbc/h2 parity

Co-Authored-By: derek.wu <derekwu35@gmail.com>
---
 build.gradle                             | 18 +++++++++++++-----
 gradle/wrapper/gradle-wrapper.properties |  2 +-
 gradlew                                  |  0
 3 files changed, 14 insertions(+), 6 deletions(-)
 mode change 100644 => 100755 gradlew

diff --git a/build.gradle b/build.gradle
index 09f1083..c164da4 100644
--- a/build.gradle
+++ b/build.gradle
@@ -22,11 +22,19 @@ repositories {
     mavenCentral()
 }
 
-sourceCompatibility = 1.8
-targetCompatibility = 1.8
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(11)
+    }
+}
 
-dependencies {
-    compile("org.springframework.boot:spring-boot-starter-web")
-    testCompile("junit:junit")
+compileJava {
+    options.encoding = 'UTF-8'
 }
 
+dependencies {
+    implementation("org.springframework.boot:spring-boot-starter-web")
+    implementation("org.springframework.boot:spring-boot-starter-jdbc")
+    runtimeOnly("com.h2database:h2")
+    testImplementation("junit:junit")
+}
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index a2ff3cc..ddfac6f 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.6-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.9.4-bin.zip
diff --git a/gradlew b/gradlew
old mode 100644
new mode 100755

From 4bd5b5f4410da97ee5e328ccfa4ea08edee2a5f1 Mon Sep 17 00:00:00 2001
From: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Date: Mon, 15 Jun 2026 21:55:59 +0000
Subject: [PATCH 3/5] feature(ci): add JDK 11 (Temurin) GitHub Actions workflow
 with Maven+Gradle cache

Co-Authored-By: derek.wu <derekwu35@gmail.com>
---
 .github/workflows/ci.yml | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 .github/workflows/ci.yml

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..48005ce
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,40 @@
+name: CI (JDK 11)
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  maven:
+    name: Maven build (Temurin 11)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up JDK 11
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: '11'
+          cache: maven
+
+      - name: Build and verify
+        run: ./mvnw -B -e clean verify
+
+  gradle:
+    name: Gradle build (Temurin 11)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up JDK 11
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: '11'
+          cache: gradle
+
+      - name: Build
+        run: ./gradlew --no-daemon clean build

From 66bf1ee842eecb6732070d2391c018b174b24475 Mon Sep 17 00:00:00 2001
From: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Date: Mon, 15 Jun 2026 21:56:19 +0000
Subject: [PATCH 4/5] bug(build): ignore build output dirs (target/, build/,
 .gradle/)

Co-Authored-By: derek.wu <derekwu35@gmail.com>
---
 .gitignore | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/.gitignore b/.gitignore
index 57f1cb2..aef0a14 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,5 @@
-/.idea/
\ No newline at end of file
+/.idea/
+target/
+build/
+.gradle/
+*.class

From e8215b7bff1ba30723680437c6c212d6eb742b25 Mon Sep 17 00:00:00 2001
From: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Date: Mon, 15 Jun 2026 21:56:19 +0000
Subject: [PATCH 5/5] feature(docs): add MIGRATION_NOTES.md and require JDK 11
 in README

Co-Authored-By: derek.wu <derekwu35@gmail.com>
---
 MIGRATION_NOTES.md | 110 +++++++++++++++++++++++++++++++++++++++++++++
 README.md          |  26 +++++++++--
 2 files changed, 132 insertions(+), 4 deletions(-)
 create mode 100644 MIGRATION_NOTES.md

diff --git a/MIGRATION_NOTES.md b/MIGRATION_NOTES.md
new file mode 100644
index 0000000..b48963e
--- /dev/null
+++ b/MIGRATION_NOTES.md
@@ -0,0 +1,110 @@
+# Java 8 → Java 11 Migration Notes
+
+This document summarizes the migration of `springboot-java8` from Java 8 to
+**Java 11 (LTS)**. The goal was a minimal, behavior-preserving migration: upgrade
+the build toolchain and CI to JDK 11, replace anything removed from the JDK, and
+keep the application code unchanged.
+
+## Summary
+
+| Area | Before | After |
+| --- | --- | --- |
+| Java language/runtime target | 8 (`java.version=1.8`) | 11 (`maven.compiler.release=11`) |
+| Maven packaging | `pom` (sources never compiled) | `jar` (sources compiled + repackaged) |
+| Maven wrapper | 3.3.9 | 3.9.9 |
+| maven-compiler-plugin | inherited 3.7.0 | 3.11.0, `<release>11</release>`, `-Xlint:all -Werror` |
+| maven-surefire-plugin | inherited 2.21.0 | 3.2.5 |
+| maven-failsafe-plugin | not configured | 3.2.5 |
+| maven-javadoc-plugin | not configured | 3.6.3, doclint disabled |
+| maven-enforcer-plugin | not configured | 3.5.0, `requireJavaVersion [11,)` |
+| Gradle wrapper | 4.6 (does not run on JDK 11) | 6.9.4 |
+| Gradle Java target | `sourceCompatibility = 1.8` | toolchain `languageVersion = 11` |
+| CI | none | GitHub Actions, Temurin 11, Maven + Gradle |
+
+## Baseline (Java 8)
+
+A Java 8 baseline was captured before any changes:
+
+- `JAVA_HOME` = Temurin/OpenJDK `1.8.0_492`
+- `./mvnw -B clean package` → `BUILD SUCCESS`
+
+Note: with the original `<packaging>pom</packaging>`, the Maven build never invoked
+the compiler, so the "baseline" Maven build did not actually compile the `hello.*`
+sources. The Gradle build was the only one that compiled code. This is called out
+because it changes what "parity" means here (see below).
+
+## Build tooling changes
+
+### Maven (`pom.xml`)
+
+- **`packaging` changed from `pom` to `jar`.** As a `pom` project the
+  `maven-compiler-plugin` and `maven-surefire-plugin` never ran, so the Java 11
+  `release` flag would have had no effect. Switching to `jar` makes Maven actually
+  compile the sources under `--release 11` and produce a runnable Spring Boot jar
+  via `spring-boot-maven-plugin:repackage`.
+- Replaced `<java.version>1.8</java.version>` with
+  `maven.compiler.release=11` plus UTF-8 source/reporting encoding.
+- Added explicit, JDK-11-compatible plugin versions:
+  `maven-compiler-plugin` 3.11.0 (`<release>11</release>`, `-Xlint:all`,
+  `-Werror`), `maven-surefire-plugin` 3.2.5, `maven-failsafe-plugin` 3.2.5,
+  `maven-javadoc-plugin` 3.6.3, `maven-enforcer-plugin` 3.5.0 enforcing
+  `requireJavaVersion [11,)`.
+- Added `spring-boot-starter-test` (test scope) so the project has a standard test
+  source set; surefire reports `No tests to run` (the project ships no tests).
+- Upgraded the Maven wrapper from 3.3.9 to 3.9.9 — the older plugin-aware tooling
+  (surefire/enforcer 3.x) requires Maven 3.6.3+.
+
+### Gradle (`build.gradle`)
+
+- Upgraded the Gradle wrapper from 4.6 to 6.9.4. Gradle 4.6 cannot run on JDK 11.
+- Replaced `sourceCompatibility/targetCompatibility = 1.8` with a Java
+  **toolchain** pinned to `JavaLanguageVersion.of(11)`. (Gradle rejects combining a
+  project-level toolchain with `source/targetCompatibility`, so the latter were
+  removed.)
+- Modernized the legacy `compile`/`testCompile` configurations to
+  `implementation`/`testImplementation`.
+- **Parity fix:** added `spring-boot-starter-jdbc` and `com.h2database:h2`. The
+  original Gradle build only declared `spring-boot-starter-web`, so it failed to
+  compile `hello.Application` (which uses `JdbcTemplate`). These deps already
+  existed in `pom.xml`; adding them brings the Gradle build to parity with Maven.
+
+## Removed JDK modules (Java EE / CORBA / JavaFX)
+
+A scan of the source (`javax.xml.bind`, `javax.activation`, `javax.xml.ws`,
+`com.sun.*`, `sun.misc.*`, Nashorn, `javafx.*`, CORBA / `org.omg.*`) found **no
+usages**. No external replacement dependencies (JAXB, JAX-WS, JavaFX, Activation)
+were required.
+
+## Encapsulation / illegal reflective access
+
+The application code triggers no illegal reflective access warnings when compiled
+or packaged on JDK 11, so **no `--add-opens` flags were added**. The only reflective
+access warning observed comes from Gradle 6.9.4's own Groovy runtime during the
+build (not from application code); it disappears with a newer Gradle and is out of
+scope for this behavior-preserving migration.
+
+## Security / TLS, GC, logging
+
+No code or configuration depends on TLS protocol/cipher pinning, keystore type, or
+GC/JVM tuning flags (the only runtime config is the optional `server.port` in
+`application.properties`). Java 11 defaults (TLS 1.3, PKCS12 keystores, G1 GC,
+unified logging) therefore apply with no changes needed.
+
+## Validation
+
+- `./mvnw -B clean verify` on **JDK 11** → `BUILD SUCCESS` (compiles with
+  `-Xlint:all -Werror`, enforcer confirms Java 11, jar repackaged).
+- `./gradlew --no-daemon clean build` on **JDK 11** → `BUILD SUCCESSFUL`.
+- No compiler warnings under `-Xlint:all`.
+- Coverage is unchanged (the project ships no tests, so coverage is 0% before and
+  after; CI is green on the build).
+
+## Follow-ups (out of scope)
+
+- Spring Boot 2.0.2 / Spring 5.0 predate official Java 11 support. Compilation and
+  packaging are clean on JDK 11, but a future PR should upgrade to Spring Boot
+  2.1+ (ideally 2.7.x) for fully supported Java 11 runtime behavior.
+- Add an actual test suite (e.g. `@SpringBootTest`) so CI verifies runtime
+  behavior, not just compilation.
+- Resolve Gradle deprecation warnings by moving to Gradle 7/8 (requires the Spring
+  Boot upgrade above, since the 2.0.2 Gradle plugin is incompatible with Gradle 7+).
diff --git a/README.md b/README.md
index 2b09400..85897f3 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,8 @@
 # springboot-java8
+
+> **Now builds and runs on Java 11 (LTS).** The build toolchain and CI target
+> JDK 11. See [`MIGRATION_NOTES.md`](MIGRATION_NOTES.md) for migration details.
+
 The project is made on spring boot. The project summarize the new features present in Java 8.
 It contain list of harcoded topics list. You can call the apis's with POSTMAN to add,delete,update Topic list
 In addition, it uses 
@@ -76,20 +80,34 @@ GET /datetime
 
 ### Prerequisites
 
-1) Java sdk
+1) JDK 11 (e.g. Eclipse Temurin 11)
 2) POSTMAN
 
 ### Installing
 
-
-
 ```
 1) Download or clone
 2) Import the project
-3) Run on location machine
+3) Run on local machine
 4) Open Postman, to call API's (  localhost:8080 )
 ```
 
+### Building & Running (JDK 11)
+
+This project can be built with either Maven or Gradle. Both target Java 11.
+
+Maven:
+```
+./mvnw clean verify          # compile, run tests, build the jar
+java -jar target/gs-spring-boot-0.1.0.jar
+```
+
+Gradle:
+```
+./gradlew clean build        # compile, run tests, build the jar
+java -jar build/libs/gs-spring-boot-0.1.0.jar
+```
+
 
 ## Helpful Links
 Spring: