docs: HelloWorldStreamFunction in examples fails with sam

.github/workflows/pr_build.yml

@@ -79,33 +79,12 @@ jobs:
         if: ${{ matrix.java == '8' }} # Gradle example can only be built on Java 8
         working-directory: examples/powertools-examples-core/kotlin
         run: ./gradlew build
-      - name: Setup Terraform
-        if: ${{ matrix.java == '11' }}
-        uses: hashicorp/setup-terraform@633666f66e0061ca3b725c73b2ec20cd13a8fdd1 #v2.0.3
       - name: Setup AWS credentials
         if: ${{ matrix.java == '11' }}
         uses: aws-actions/configure-aws-credentials@5fd3084fc36e372ff1fff382a39b10d03659f355 # v2.2.0
         with:
           role-to-assume: ${{ secrets.AWS_ROLE_ARN_TO_ASSUME }}
           aws-region: ${{ env.AWS_REGION }}
-      - name: Terraform validate
-        working-directory: examples/powertools-examples-core/terraform
-        if: ${{ matrix.java == '11' }}
-        run: |
-          terraform -version
-          terraform init -backend=false
-          terraform validate
-          terraform plan
-      - name: Setup Terraform lint
-        if: ${{ matrix.java == '11' }}
-        uses: terraform-linters/setup-tflint@a5a1af8c6551fb10c53f1cd4ba62359f1973746f # v3.1.1
-      - name: Terraform lint
-        working-directory: examples/powertools-examples-core/terraform
-        if: ${{ matrix.java == '11' }}
-        run: |
-          tflint --version
-          tflint --init
-          tflint -f compact
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@d9f34f8cd5cb3b3eb79b3e4b5dae3a16df499a70 # v3.1.1
         if: ${{ matrix.java == '11' }} # publish results once

.github/workflows/pr_iac_lint_.yml

@@ -0,0 +1,45 @@
+name: Validate IaC
+
+on:
+  pull_request:
+    branches:
+      - main
+      - v2
+    paths:
+      - 'examples/**'
+jobs:
+  linter:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        project: ["sam", "gradle", "kotlin"]
+    steps:
+      - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9  # v3.5.3
+      - name: Setup java JDK
+        uses: actions/setup-java@5ffc13f4174014e2d4d4572b3d74c3fa61aeb2c2 # v3.11.0
+        with:
+          distribution: 'corretto'
+          java-version: 11
+      - name: Run SAM validator to check syntax of IaC templates - Java
+        working-directory: examples/powertools-examples-core/${{ matrix.project }}
+        run: | 
+          sam build
+          sam validate --lint
+      - name: Setup Terraform
+        uses: hashicorp/setup-terraform@633666f66e0061ca3b725c73b2ec20cd13a8fdd1 #v2.0.3
+      - name: Run Terraform validator to check syntax of IaC templates and produce a plan of changes
+        working-directory: examples/powertools-examples-core/terraform
+        run: |
+          mvn install
+          terraform -version
+          terraform init -backend=false
+          terraform validate
+          terraform plan
+      - name: Setup Terraform lint
+        uses: terraform-linters/setup-tflint@a5a1af8c6551fb10c53f1cd4ba62359f1973746f # v3.1.1
+      - name: Run Terraform lint to check for best practices, errors, deprecated syntax etc.
+        working-directory: examples/powertools-examples-core/terraform
+        run: |
+          tflint --version
+          tflint --init
+          tflint -f compact

examples/powertools-examples-core/sam/src/main/java/helloworld/AppStream.java

@@ -17,22 +17,40 @@
 import com.amazonaws.services.lambda.runtime.Context;
 import com.amazonaws.services.lambda.runtime.RequestStreamHandler;
 import com.fasterxml.jackson.databind.ObjectMapper;
+
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
-import java.util.Map;
+import java.nio.charset.StandardCharsets;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
 import software.amazon.lambda.powertools.logging.Logging;
 import software.amazon.lambda.powertools.metrics.Metrics;
 
+import java.io.InputStreamReader;
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.OutputStreamWriter;
+import java.io.PrintWriter;
+
 public class AppStream implements RequestStreamHandler {
     private static final ObjectMapper mapper = new ObjectMapper();
+    private final static Logger log = LogManager.getLogger(AppStream.class);
 
     @Override
     @Logging(logEvent = true)
     @Metrics(namespace = "ServerlessAirline", service = "payment", captureColdStart = true)
-    public void handleRequest(InputStream input, OutputStream output, Context context) throws IOException {
-        Map map = mapper.readValue(input, Map.class);
+    public void handleRequest(InputStream input, OutputStream output, Context context) {
+        try (BufferedReader reader = new BufferedReader(new InputStreamReader(input, StandardCharsets.UTF_8));
+             PrintWriter writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(output, StandardCharsets.UTF_8)))) {
 
-        System.out.println(map.size());
+            log.info("Received: " + mapper.writerWithDefaultPrettyPrinter().writeValueAsString(mapper.readTree(reader)));
+
+            writer.write("{\"body\": \"" + System.currentTimeMillis() + "\"} ");
+        } catch (IOException e) {
+            log.error("Something has gone wrong: ", e);
+        }
     }
 }
+