Update Gradle to 8.12 and Java to 21 (LTS) with Spring Boot 3.4.1

${env:LOG_PATH}/elk.json

@@ -0,0 +1,5 @@
+{"instant":{"epochSecond":1759267686,"nanoOfSecond":287657475},"thread":"Test worker","level":"INFO","loggerName":"org.springframework.test.context.support.AnnotationConfigContextLoaderUtils","message":"Could not detect default configuration classes for test class [com.example.elk_example.ElkExampleApplicationTests]: ElkExampleApplicationTests does not declare any static, non-private, non-final, nested classes annotated with @Configuration.","contextMap":{},"endOfBatch":true,"loggerFqcn":"org.apache.commons.logging.LogAdapter$Log4jLog","threadId":1,"threadPriority":5}
+{"instant":{"epochSecond":1759267686,"nanoOfSecond":396775893},"thread":"Test worker","level":"INFO","loggerName":"org.springframework.boot.test.context.SpringBootTestContextBootstrapper","message":"Found @SpringBootConfiguration com.example.elk_example.ElkExampleApplication for test class com.example.elk_example.ElkExampleApplicationTests","contextMap":{},"endOfBatch":true,"loggerFqcn":"org.apache.commons.logging.LogAdapter$Log4jLog","threadId":1,"threadPriority":5}
+{"instant":{"epochSecond":1759267686,"nanoOfSecond":774248974},"thread":"Test worker","level":"INFO","loggerName":"com.example.elk_example.ElkExampleApplicationTests","message":"Starting ElkExampleApplicationTests using Java 21.0.8 with PID 7219 (started by runner in /home/runner/work/ELK-Logger/ELK-Logger)","contextMap":{},"endOfBatch":true,"loggerFqcn":"org.apache.commons.logging.LogAdapter$Log4jLog","threadId":1,"threadPriority":5}
+{"instant":{"epochSecond":1759267686,"nanoOfSecond":780247480},"thread":"Test worker","level":"INFO","loggerName":"com.example.elk_example.ElkExampleApplicationTests","message":"No active profile set, falling back to 1 default profile: \"default\"","contextMap":{},"endOfBatch":true,"loggerFqcn":"org.apache.commons.logging.LogAdapter$Log4jLog","threadId":1,"threadPriority":5}
+{"instant":{"epochSecond":1759267687,"nanoOfSecond":717134907},"thread":"Test worker","level":"INFO","loggerName":"com.example.elk_example.ElkExampleApplicationTests","message":"Started ElkExampleApplicationTests in 1.191 seconds (process running for 2.483)","contextMap":{},"endOfBatch":true,"loggerFqcn":"org.apache.commons.logging.LogAdapter$Log4jLog","threadId":1,"threadPriority":5}

.gitignore

@@ -179,4 +179,4 @@ gradle-app.setting
 # JDT-specific (Eclipse Java Development Tools)
 .classpath
 
-# End of https://www.toptal.com/developers/gitignore/api/java,gradle,intellij+all
+# End of https://www.toptal.com/developers/gitignore/api/java,gradle,intellij+all${env:LOG_PATH}/

Dockerfile

@@ -1,11 +1,11 @@
-FROM gradle:7-jdk-alpine AS build
+FROM eclipse-temurin:21-jdk AS build
 LABEL maintainer="Thomas Mildner"
-COPY --chown=gradle:gradle . /home/gradle/src
-WORKDIR /home/gradle/src
-RUN gradle build --no-daemon
+COPY --chown=1000:1000 . /home/app/src
+WORKDIR /home/app/src
+RUN chmod +x gradlew && ./gradlew build --no-daemon
 
-FROM openjdk:17-alpine
+FROM eclipse-temurin:21-jre
 EXPOSE 8080
 RUN mkdir /app
-COPY --from=build /home/gradle/src/build/libs/ELK_Example-0.0.1-SNAPSHOT.jar /app/elk-spring-boot-application.jar
+COPY --from=build /home/app/src/build/libs/ELK_Example-0.0.1-SNAPSHOT.jar /app/elk-spring-boot-application.jar
 ENTRYPOINT ["java", "-jar","/app/elk-spring-boot-application.jar"]

UPGRADE_NOTES.md

@@ -0,0 +1,76 @@
+# Upgrade Notes - Gradle and Java Version Update
+
+## Summary of Changes
+
+This project has been upgraded to use the latest stable versions of Gradle and Java.
+
+### Version Updates
+
+| Component | Previous Version | New Version |
+|-----------|-----------------|-------------|
+| Java | 17 | 21 (LTS) |
+| Gradle | 7.4 | 8.12 |
+| Spring Boot | 2.6.4 | 3.4.1 |
+| Spring Dependency Management | 1.0.11.RELEASE | 1.1.7 |
+| Docker Base Image (Build) | gradle:7-jdk-alpine | eclipse-temurin:21-jdk |
+| Docker Base Image (Runtime) | openjdk:17-alpine | eclipse-temurin:21-jre |
+
+### Changes Made
+
+1. **Gradle Wrapper Update**
+   - Updated `gradle/wrapper/gradle-wrapper.properties` to use Gradle 8.12
+   - Gradle wrapper binary updated automatically
+
+2. **Build Configuration**
+   - Updated `build.gradle`:
+     - Spring Boot plugin: 2.6.4 → 3.4.1
+     - Dependency Management plugin: 1.0.11.RELEASE → 1.1.7
+     - Source compatibility: Java 17 → Java 21
+
+3. **Dockerfile Updates**
+   - Build stage now uses `eclipse-temurin:21-jdk`
+   - Runtime stage now uses `eclipse-temurin:21-jre`
+   - Uses Eclipse Temurin (Adoptium) instead of deprecated OpenJDK images
+
+### Compatibility
+
+- All existing tests pass successfully with Java 21
+- Spring Boot 3.4.1 is fully compatible with Java 21
+- The application builds and runs without any code changes
+
+### Building the Project
+
+```bash
+# Build with Gradle wrapper
+./gradlew build
+
+# Run tests
+./gradlew test
+
+# Build Docker image
+docker build -t elk-logger:latest .
+
+# Or use docker-compose
+docker-compose up -d
+```
+
+### Notes
+
+- Java 21 is a Long-Term Support (LTS) release, ensuring long-term stability and support
+- Gradle 8.12 includes performance improvements and new features
+- Spring Boot 3.4.1 includes the latest security patches and features
+- The Eclipse Temurin images are the recommended OpenJDK distribution
+
+### Migration Path
+
+If you're upgrading from the previous version:
+
+1. Ensure you have Java 21 installed locally for development
+2. Update your IDE to use Java 21
+3. Pull the latest changes and run `./gradlew clean build`
+4. All dependencies will be downloaded automatically by Gradle
+5. No code changes are required
+
+### Known Issues
+
+- Some IDEs may show warnings about Mockito dynamic agent loading in tests with Java 21. This is expected and does not affect functionality.

build.gradle

@@ -1,12 +1,12 @@
 plugins {
-    id 'org.springframework.boot' version '2.6.4'
-    id 'io.spring.dependency-management' version '1.0.11.RELEASE'
+    id 'org.springframework.boot' version '3.4.1'
+    id 'io.spring.dependency-management' version '1.1.7'
     id 'java'
 }
 
 group = 'com.example'
 version = '0.0.1-SNAPSHOT'
-sourceCompatibility = '17'
+sourceCompatibility = '21'
 
 repositories {
     mavenCentral()

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.4-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.12-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

gradlew.bat

@@ -1,89 +1,89 @@
-@rem
-@rem Copyright 2015 the original author or authors.
-@rem
-@rem Licensed under the Apache License, Version 2.0 (the "License");
-@rem you may not use this file except in compliance with the License.
-@rem You may obtain a copy of the License at
-@rem
-@rem      https://www.apache.org/licenses/LICENSE-2.0
-@rem
-@rem Unless required by applicable law or agreed to in writing, software
-@rem distributed under the License is distributed on an "AS IS" BASIS,
-@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-@rem See the License for the specific language governing permissions and
-@rem limitations under the License.
-@rem
-
-@if "%DEBUG%" == "" @echo off
-@rem ##########################################################################
-@rem
-@rem  Gradle startup script for Windows
-@rem
-@rem ##########################################################################
-
-@rem Set local scope for the variables with windows NT shell
-if "%OS%"=="Windows_NT" setlocal
-
-set DIRNAME=%~dp0
-if "%DIRNAME%" == "" set DIRNAME=.
-set APP_BASE_NAME=%~n0
-set APP_HOME=%DIRNAME%
-
-@rem Resolve any "." and ".." in APP_HOME to make it shorter.
-for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
-
-@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
-
-@rem Find java.exe
-if defined JAVA_HOME goto findJavaFromJavaHome
-
-set JAVA_EXE=java.exe
-%JAVA_EXE% -version >NUL 2>&1
-if "%ERRORLEVEL%" == "0" goto execute
-
-echo.
-echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
-
-goto fail
-
-:findJavaFromJavaHome
-set JAVA_HOME=%JAVA_HOME:"=%
-set JAVA_EXE=%JAVA_HOME%/bin/java.exe
-
-if exist "%JAVA_EXE%" goto execute
-
-echo.
-echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
-
-goto fail
-
-:execute
-@rem Setup the command line
-
-set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
-
-
-@rem Execute Gradle
-"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
-
-:end
-@rem End local scope for the variables with windows NT shell
-if "%ERRORLEVEL%"=="0" goto mainEnd
-
-:fail
-rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
-rem the _cmd.exe /c_ return code!
-if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
-exit /b 1
-
-:mainEnd
-if "%OS%"=="Windows_NT" endlocal
-
-:omega
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega