Fixes #372 - Add support for building Native Java images for the Java GenAI library

.gitignore

@@ -0,0 +1,40 @@
+target/
+
+### IntelliJ IDEA ###
+.idea/*
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
+
+### .env files contain local environment variables ###
+.env
+langchain4j-core/target_test-classes/

pom.xml

@@ -1,6 +1,6 @@
-<?xml version="1.0" encoding="UTF-8"?>
-
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <groupId>com.google.genai</groupId>
@@ -61,7 +61,9 @@
     <repository>
       <id>ossrh</id>
       <name>Central Repository OSSRH</name>
-      <url>https://google.oss.sonatype.org/service/local/staging/deploy/maven2/</url>
+      <url>
+        https://google.oss.sonatype.org/service/local/staging/deploy/maven2/
+      </url>
     </repository>
     <snapshotRepository>
       <id>ossrh</id>
@@ -131,7 +133,7 @@
       <artifactId>Java-WebSocket</artifactId>
       <version>${java-websocket.version}</version>
     </dependency>
-    <!-- JUnit 5 -->
+
     <dependency>
       <groupId>org.junit.jupiter</groupId>
       <artifactId>junit-jupiter-api</artifactId>
@@ -156,14 +158,14 @@
       <version>${junit.version}</version>
       <scope>test</scope>
     </dependency>
-    <!-- Mockito -->
+
     <dependency>
       <groupId>org.mockito</groupId>
       <artifactId>mockito-core</artifactId>
       <version>${mockito.version}</version>
       <scope>test</scope>
     </dependency>
-    <!-- jspecify -->
+
     <dependency>
       <groupId>org.jspecify</groupId>
       <artifactId>jspecify</artifactId>
@@ -178,14 +180,14 @@
   </dependencies>
 
   <build>
-    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
+    <pluginManagement>
       <plugins>
-        <!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
+
         <plugin>
           <artifactId>maven-clean-plugin</artifactId>
           <version>3.1.0</version>
         </plugin>
-        <!-- default lifecycle, jar packaging: see https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
+
         <plugin>
           <artifactId>maven-resources-plugin</artifactId>
           <version>3.0.2</version>
@@ -207,16 +209,17 @@
           <artifactId>maven-surefire-plugin</artifactId>
           <version>3.5.2</version>
           <dependencies>
-          <!-- tree view output test results: https://maven.apache.org/surefire/maven-surefire-plugin/examples/junit-platform.html#external-extensions-for-the-plugin -->
-              <dependency>
-                  <groupId>me.fabriciorby</groupId>
-                  <artifactId>maven-surefire-junit5-tree-reporter</artifactId>
-                  <version>0.1.0</version>
-              </dependency>
+
+            <dependency>
+              <groupId>me.fabriciorby</groupId>
+              <artifactId>maven-surefire-junit5-tree-reporter</artifactId>
+              <version>0.1.0</version>
+            </dependency>
           </dependencies>
           <configuration>
-              <reportFormat>plain</reportFormat>
-              <statelessTestsetInfoReporter implementation="org.apache.maven.plugin.surefire.extensions.junit5.JUnit5StatelessTestsetInfoTreeReporter"/>
+            <reportFormat>plain</reportFormat>
+            <statelessTestsetInfoReporter
+                implementation="org.apache.maven.plugin.surefire.extensions.junit5.JUnit5StatelessTestsetInfoTreeReporter"/>
           </configuration>
         </plugin>
         <plugin>
@@ -231,7 +234,7 @@
           <artifactId>maven-deploy-plugin</artifactId>
           <version>2.8.2</version>
         </plugin>
-        <!-- site lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
+
         <plugin>
           <artifactId>maven-site-plugin</artifactId>
           <version>3.7.1</version>
@@ -261,6 +264,7 @@
           <executions>
             <execution>
               <id>attach-sources</id>
+              <phase>package</phase>
               <goals>
                 <goal>jar-no-fork</goal>
               </goals>
@@ -285,7 +289,8 @@
             <show>public</show>
             <doclint>html</doclint>
             <nohelp>true</nohelp>
-            <outputDirectory>${project.build.directory}/javadoc</outputDirectory>
+            <outputDirectory>${project.build.directory}/javadoc
+            </outputDirectory>
             <doctitle>Google Gen AI Java SDK</doctitle>
             <source>${maven.compiler.source}</source>
             <encoding>UTF-8</encoding>
@@ -333,6 +338,52 @@
           </execution>
         </executions>
       </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-source-plugin</artifactId>
+      </plugin>
+      <plugin>
+        <groupId>org.graalvm.buildtools</groupId>
+        <artifactId>native-maven-plugin</artifactId>
+        <version>0.10.2</version>
+        <extensions>true</extensions>
+        <configuration>
+          <buildArgs>
+            <buildArg>--no-fallback</buildArg>
+            <buildArg>--verbose</buildArg>
+          </buildArgs>
+        </configuration>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-resources-plugin</artifactId>
+        <configuration>
+          <filtering>false</filtering>
+        </configuration>
+      </plugin>
     </plugins>
+    <resources>
+      <resource>
+        <directory>src/main/resources</directory>
+        <filtering>false</filtering>
+      </resource>
+    </resources>
   </build>
+  <profiles>
+
+    <profile>
+        <id>native-tests</id>
+        <build>
+          <plugins>
+            <plugin>
+              <groupId>org.apache.maven.plugins</groupId>
+              <artifactId>maven-surefire-plugin</artifactId>
+              <configuration>
+                <argLine>@{argLine} -agentlib:native-image-agent=config-output-dir=target/native-image</argLine>
+              </configuration>
+            </plugin>
+          </plugins>
+        </build>
+    </profile>
+  </profiles>
 </project>

src/main/java/com/google/genai/Common.java

@@ -19,6 +19,7 @@
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.node.ArrayNode;
 import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.google.genai.errors.GenAiIOException;
 import java.io.UnsupportedEncodingException;
 import java.net.URLEncoder;
 import java.nio.charset.StandardCharsets;
@@ -27,14 +28,17 @@
 import java.util.List;
 import java.util.Map;
 import java.util.StringJoiner;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 import org.jspecify.annotations.Nullable;
-import com.google.genai.errors.GenAiIOException;
 
 /** Common utility methods for the GenAI SDK. */
 final class Common {
 
   private Common() {}
 
+  private static final Pattern PLACEHOLDER_PATTERN = Pattern.compile("\\{([^}]+)\\}");
+
   /**
    * Sets the value of an object by a path.
    *
@@ -161,7 +165,8 @@ static void setValueByPath(ObjectNode jsonObject, String[] path, Object value) {
       } else {
         if (currentObject.isObject() && ((ObjectNode) currentObject).has(key)) {
           currentObject = ((ObjectNode) currentObject).get(key);
-        } else {
+        }
+        else {
           return null;
         }
       }
@@ -171,20 +176,30 @@ static void setValueByPath(ObjectNode jsonObject, String[] path, Object value) {
   }
 
   static String formatMap(String template, JsonNode data) {
-    if (data == null) {
+    if (data == null || !data.isObject()) {
       return template;
     }
 
-    Iterator<Map.Entry<String, JsonNode>> fields = data.fields();
-    while (fields.hasNext()) {
-      Map.Entry<String, JsonNode> field = fields.next();
-      String key = field.getKey();
-      String placeholder = "{" + key + "}";
-      if (template.contains(placeholder)) {
-        template = template.replace(placeholder, data.get(key).asText());
+    System.out.println("Template " + template);
+    System.out.println("Data " + data);
+
+    Matcher matcher = PLACEHOLDER_PATTERN.matcher(template);
+    StringBuffer resultBuffer = new StringBuffer();
+
+    while (matcher.find()) {
+      String key = matcher.group(1);
+      // JsonNode valueNode = data.get(key);
+      JsonNode valueNode = data.path(key);
+
+      if (valueNode != null && valueNode.isValueNode()) {
+        String replacement = valueNode.asText();
+        matcher.appendReplacement(resultBuffer, Matcher.quoteReplacement(replacement));
       }
     }
-    return template;
+    matcher.appendTail(resultBuffer);
+
+    System.out.println("Template " + template);
+    return resultBuffer.toString();
   }
 
   static boolean isZero(Object obj) {

src/main/resources/META-INF/native-image/com.google.genai/google-genai/jni-config.json

@@ -0,0 +1,31 @@
+[
+  {
+    "name": "sun.management.VMManagementImpl",
+    "fields": [
+      {
+        "name": "compTimeMonitoringSupport"
+      },
+      {
+        "name": "currentThreadCpuTimeSupport"
+      },
+      {
+        "name": "objectMonitorUsageSupport"
+      },
+      {
+        "name": "otherThreadCpuTimeSupport"
+      },
+      {
+        "name": "remoteDiagnosticCommandsSupport"
+      },
+      {
+        "name": "synchronizerUsageSupport"
+      },
+      {
+        "name": "threadAllocatedMemorySupport"
+      },
+      {
+        "name": "threadContentionMonitoringSupport"
+      }
+    ]
+  }
+]

src/main/resources/META-INF/native-image/com.google.genai/google-genai/native-image.properties

@@ -0,0 +1 @@
+Args = --initialize-at-build-time=org.junit.platform.commons.util.LruCache,org.mockito,net.bytebuddy,org.objenesis,com.google.genai.Client