Support Java 21 (#336)

This PR is to fix #335

.github/workflows/main.yaml

@@ -1,39 +1,38 @@
 name: Java CI
 
-on: [pull_request]
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
 
 jobs:
-  build:
+  java_build:
+    strategy:
+      matrix:
+        java_version: [8, 11, 17, 21]
+        include:
+          - java_version: '8'
+            included_modules: '-pl !langchain4j-graal,!langchain4j-opensearch'
+          - java_version: '11'
+            included_modules: '-pl !langchain4j-graal'
+          - java_version: '17'
+            included_modules: '-pl !langchain4j-graal'
+          - java_version: '21'
+            included_modules: ''
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-
-      - name: Set up JDK 8
+      - name: Set up JDK ${{ matrix.java_version }}
         uses: actions/setup-java@v3
         with:
-          java-version: '8'
+          java-version: ${{ matrix.java_version }}
           distribution: 'temurin'
           cache: 'maven'
-      - name: Build with JDK 8 (excluding modules requiring JDK 11 and 17)
-        run: mvn --batch-mode install -DskipITs -pl !langchain4j-opensearch,!langchain4j-graal
-
-      - name: Set up JDK 11
-        uses: actions/setup-java@v3
-        with:
-          java-version: '11'
-          distribution: 'temurin'
-          cache: 'maven'
-      - name: Build modules requiring JDK 11
-        run: mvn --batch-mode install -DskipITs -pl langchain4j-opensearch
-
-      - name: Set up JDK 17
-        uses: actions/setup-java@v3
-        with:
-          java-version: '17'
-          distribution: 'temurin'
-          cache: 'maven'
-      - name: Build modules requiring JDK 17
-        run: mvn --batch-mode install -DskipTests -DskipITs -pl langchain4j-graal
+      - name: Build with JDK ${{ matrix.java_version }}
+        run: mvn --batch-mode install -DskipITs ${{ matrix.included_modules }}
 
   # For checking some compliance things (require a recent JDK due to plugins so in a separate step)
   compliance:

langchain4j-cassandra/pom.xml

@@ -75,14 +75,14 @@
         <dependency>
             <groupId>dev.langchain4j</groupId>
             <artifactId>langchain4j</artifactId>
-            <version>${parent.version}</version>
+            <version>${project.parent.version}</version>
             <scope>test</scope>
         </dependency>
 
         <dependency>
             <groupId>dev.langchain4j</groupId>
             <artifactId>langchain4j-open-ai</artifactId>
-            <version>${parent.version}</version>
+            <version>${project.parent.version}</version>
             <scope>test</scope>
         </dependency>
 

langchain4j-parent/pom.xml

@@ -30,6 +30,7 @@
         <gson.version>2.10.1</gson.version>
         <junit.version>5.10.0</junit.version>
         <testcontainers.version>1.19.2</testcontainers.version>
+        <bytebuddy.version>1.14.10</bytebuddy.version>
         <mockito.version>4.11.0</mockito.version>
         <assertj.version>3.24.2</assertj.version>
         <tinylog.version>2.6.2</tinylog.version>
@@ -198,6 +199,12 @@
                 <version>${mockito.version}</version>
             </dependency>
 
+            <dependency>
+                <groupId>net.bytebuddy</groupId>
+                <artifactId>byte-buddy</artifactId>
+                <version>${bytebuddy.version}</version>
+            </dependency>
+
             <dependency>
                 <groupId>org.assertj</groupId>
                 <artifactId>assertj-core</artifactId>
@@ -313,6 +320,15 @@
     </dependencyManagement>
 
     <build>
+        <pluginManagement>
+            <plugins>
+                <plugin>
+                    <groupId>org.honton.chas</groupId>
+                    <artifactId>license-maven-plugin</artifactId>
+                    <version>0.0.3</version>
+                </plugin>
+            </plugins>
+        </pluginManagement>
         <plugins>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>