use virtual threads by default

Author: zhongkechen

examples/Dockerfile

@@ -1,5 +1,5 @@
 # Build stage
-FROM amazoncorretto:17-alpine AS builder
+FROM amazoncorretto:25-alpine AS builder
 
 # Install Maven
 RUN apk add --no-cache maven
@@ -19,7 +19,7 @@ RUN mvn clean install -DskipTests -pl sdk,sdk-testing -am
 RUN mvn clean package -DskipTests -pl examples -am
 
 # Runtime stage
-FROM public.ecr.aws/lambda/java:17
+FROM public.ecr.aws/lambda/java:25
 
 # Copy only the built JAR from build stage
 COPY --from=builder /build/examples/target/*.jar ${LAMBDA_TASK_ROOT}/lib/

examples/src/main/java/software/amazon/lambda/durable/examples/ManyAsyncStepsExample.java

@@ -4,7 +4,9 @@
 
 import java.time.Duration;
 import java.util.ArrayList;
+import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;
+import software.amazon.lambda.durable.DurableConfig;
 import software.amazon.lambda.durable.DurableContext;
 import software.amazon.lambda.durable.DurableFuture;
 import software.amazon.lambda.durable.DurableHandler;
@@ -61,4 +63,12 @@ public Output handleRequest(Input input, DurableContext context) {
 
         return new Output(totalSum, executionTimeMs, replayTimeMs);
     }
+
+    public DurableConfig createConfiguration() {
+
+        // using a virtual thread pool
+        return DurableConfig.builder()
+                .withExecutorService(Executors.newVirtualThreadPerTaskExecutor())
+                .build();
+    }
 }

pom.xml

@@ -46,8 +46,8 @@
     </modules>
 
     <properties>
-        <maven.compiler.source>17</maven.compiler.source>
-        <maven.compiler.target>17</maven.compiler.target>
+        <maven.compiler.source>25</maven.compiler.source>
+        <maven.compiler.target>25</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <aws.sdk.version>2.42.8</aws.sdk.version>
         <jackson.version>2.21.1</jackson.version>

sdk/pom.xml

@@ -79,6 +79,10 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>21</source>
+                    <target>21</target>
+                </configuration>
             </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>

sdk/src/main/java/software/amazon/lambda/durable/DurableConfig.java

@@ -237,6 +237,7 @@ private static String getProjectVersion(String versionFile) {
      */
     private static ExecutorService createDefaultExecutor() {
         logger.debug("Creating default ExecutorService");
+        // return Executors.newVirtualThreadPerTaskExecutor();
         return Executors.newCachedThreadPool(r -> {
             Thread t = new Thread(r);
             t.setName("durable-exec-" + t.getId());