Use java 21 on 1.1.x

.github/workflows/artifactory-milestone-release.yml

@@ -15,10 +15,10 @@ jobs:
       - name: Checkout source code
         uses: actions/checkout@v4
 
-      - name: Set up JDK 17
+      - name: Set up JDK
         uses: actions/setup-java@v4
         with:
-          java-version: '17'
+          java-version: '21'
           distribution: 'temurin'
           cache: 'maven'
 

.github/workflows/continuous-integration.yml

@@ -48,7 +48,7 @@ jobs:
       - name: Set up JDK 17
         uses: actions/setup-java@v4
         with:
-          java-version: '17'
+          java-version: '21'
           distribution: 'temurin'
           cache: 'maven'
 

.github/workflows/documentation-upload.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Set up JDK 17
         uses: actions/setup-java@v4
         with:
-          java-version: '17'
+          java-version: '21'
           distribution: 'temurin'
           cache: 'maven'
 

.github/workflows/fast-continuous-integration.yml

@@ -30,7 +30,7 @@ jobs:
       - name: Set up JDK 17
         uses: actions/setup-java@v4
         with:
-          java-version: '17'
+          java-version: '21'
           distribution: 'temurin'
           cache: 'maven'
 
@@ -65,7 +65,7 @@ jobs:
       - name: Set up JDK 17
         uses: actions/setup-java@v4
         with:
-          java-version: '17'
+          java-version: '21'
           distribution: 'temurin'
           cache: 'maven'
 
@@ -102,7 +102,7 @@ jobs:
       - name: Set up JDK 17
         uses: actions/setup-java@v4
         with:
-          java-version: '17'
+          java-version: '21'
           distribution: 'temurin'
           cache: 'maven'
 
@@ -139,7 +139,7 @@ jobs:
       - name: Set up JDK 17
         uses: actions/setup-java@v4
         with:
-          java-version: '17'
+          java-version: '21'
           distribution: 'temurin'
           cache: 'maven'
 
@@ -176,7 +176,7 @@ jobs:
       - name: Set up JDK 17
         uses: actions/setup-java@v4
         with:
-          java-version: '17'
+          java-version: '21'
           distribution: 'temurin'
           cache: 'maven'
 
@@ -219,7 +219,7 @@ jobs:
       - name: Set up JDK 17
         uses: actions/setup-java@v4
         with:
-          java-version: '17'
+          java-version: '21'
           distribution: 'temurin'
           cache: 'maven'
 
@@ -248,7 +248,7 @@ jobs:
       - name: Set up JDK 17
         uses: actions/setup-java@v4
         with:
-          java-version: '17'
+          java-version: '21'
           distribution: 'temurin'
           cache: 'maven'
 

.github/workflows/main-push-fast.yml

@@ -53,7 +53,7 @@ jobs:
 
       - uses: actions/setup-java@v4
         with:
-          java-version: '17'
+          java-version: '21'
           distribution: 'temurin'
           # cache: 'maven'  # Disabled for fast workflow - reduces post-job noise
 

.github/workflows/maintenance-fast.yml

@@ -20,7 +20,7 @@ jobs:
 
       - uses: actions/setup-java@v4
         with:
-          java-version: '17'
+          java-version: '21'
           distribution: 'temurin'
           cache: 'maven'
 

.github/workflows/pr-check.yml

@@ -14,10 +14,10 @@ jobs:
       - name: Checkout source code
         uses: actions/checkout@v4
 
-      - name: Set up JDK 17
+      - name: Set up JDK
         uses: actions/setup-java@v4
         with:
-          java-version: '17'
+          java-version: '21'
           distribution: 'temurin'
           cache: 'maven'
 

.github/workflows/release-notes-generation.yml

@@ -23,10 +23,10 @@ jobs:
       - name: Download changelog generator
         run: wget https://github.com/spring-io/github-changelog-generator/releases/download/v$GENERATOR_VERSION/github-changelog-generator.jar
 
-      - name: Set up JDK 17
+      - name: Set up JDK
         uses: actions/setup-java@v4
         with:
-          java-version: '17'
+          java-version: '21'
           distribution: 'temurin'
 
       - name: Prepare configuration file

.sdkmanrc

@@ -0,0 +1,3 @@
+# Enable auto-env through the sdkman_auto_env config
+# Add key=value pairs of SDKs to use below
+java=21.0.9-tem

README.md

@@ -1,5 +1,11 @@
 # Spring AI [![build status](https://github.com/spring-projects/spring-ai/actions/workflows/continuous-integration.yml/badge.svg)](https://github.com/spring-projects/spring-ai/actions/workflows/continuous-integration.yml) [![build status](https://github.com/spring-projects/spring-ai-integration-tests/actions/workflows/spring-ai-integration-tests.yml/badge.svg)](https://github.com/spring-projects/spring-ai-integration-tests/actions/workflows/spring-ai-integration-tests.yml)
 
+### Spring Boot Version Compatibility
+
+> **Spring AI 2.x.x** ([main](https://github.com/spring-projects/spring-ai/tree/main) branch) - Spring Boot `4.x`
+>
+> **Spring AI 1.1.x** ([1.1.x](https://github.com/spring-projects/spring-ai/tree/1.1.x) branch) - Spring Boot `3.5.x`
+
 
 The Spring AI project provides a Spring-friendly API and abstractions for developing AI applications.
 
@@ -65,7 +71,9 @@ To clone it you have to either:
 
 ## Building
 
-Build using Java 17.
+The project targets and build artifacts compatible with Java 17+.
+We encourage using Java 21 to build (especially if you switch back and forth between 
+the main branch and the 1.1.x branch), but the project can be built with Java 17.
 
 To build with running unit tests
 

pom.xml

@@ -274,7 +274,6 @@
 		<maven.compiler.source>${java.version}</maven.compiler.source>
 		<maven.compiler.target>${java.version}</maven.compiler.target>
 		<kotlin.compiler.jvmTarget>${java.version}</kotlin.compiler.jvmTarget>
-		<kotlin.compiler.version>2.2.21</kotlin.compiler.version>
 
 		<!-- production dependencies -->
 		<spring-boot.version>3.5.8</spring-boot.version>
@@ -346,7 +345,7 @@
 
 		<!-- plugin versions -->
 		<antlr.version>4.13.1</antlr.version>
-		<maven-compiler-plugin.version>3.11.0</maven-compiler-plugin.version>
+		<maven-compiler-plugin.version>3.14.1</maven-compiler-plugin.version>
 		<maven-surefire-plugin.version>3.1.2</maven-surefire-plugin.version>
 		<maven-failsafe-plugin.version>3.5.2</maven-failsafe-plugin.version>
 		<maven-javadoc-plugin.version>3.5.0</maven-javadoc-plugin.version>
@@ -429,10 +428,12 @@
 			<plugin>
 				<groupId>org.jetbrains.kotlin</groupId>
 				<artifactId>kotlin-maven-plugin</artifactId>
-				<version>${kotlin.compiler.version}</version>
+				<version>${kotlin.version}</version>
 				<configuration>
 					<jvmTarget>${java.version}</jvmTarget>
 					<javaParameters>true</javaParameters>
+					<apiVersion>1.7</apiVersion>
+					<languageVersion>1.7</languageVersion>
 				</configuration>
 				<executions>
 					<execution>
@@ -468,7 +469,7 @@
 				<configuration>
 					<release>${java.version}</release>
 					<compilerArgs>
-						<compilerArg>-parameters</compilerArg>
+						<arg>-parameters</arg>
 					</compilerArgs>
 				</configuration>
 				<executions>