Add hello examples to various services (#5698)

* add hello examples

.doc_gen/metadata/dynamodb_metadata.yaml

@@ -5,6 +5,15 @@ dynamodb_Hello:
   synopsis: get started using &DDB;.
   category: Hello
   languages:
+    Java:
+      versions:
+        - sdk_version: 2
+          github: javav2/example_code/dynamodb
+          sdkguide:
+          excerpts:
+            - description:
+              snippet_tags:
+                - dynamodb.java2.list_tables.main
     .NET:
       versions:
         - sdk_version: 3

.doc_gen/metadata/glue_metadata.yaml

@@ -5,6 +5,15 @@ glue_Hello:
   synopsis: get started using &GLU;.
   category: Hello
   languages:
+    Java:
+      versions:
+        - sdk_version: 2
+          github: javav2/example_code/glue
+          sdkguide:
+          excerpts:
+            - description:
+              snippet_tags:
+                - glue.java2.hello.main
     .NET:
       versions:
         - sdk_version: 3

.doc_gen/metadata/iam_metadata.yaml

@@ -4,6 +4,15 @@ iam_Hello:
   synopsis: get started using &IAM;.
   category: Hello
   languages:
+    Java:
+      versions:
+        - sdk_version: 2
+          github: javav2/example_code/iam
+          sdkguide:
+          excerpts:
+            - description:
+              snippet_tags:
+                - iam.java2.hello.main
     .NET:
       versions:
         - sdk_version: 3

.doc_gen/metadata/s3_metadata.yaml

@@ -5,6 +5,15 @@ s3_Hello:
   synopsis: get started using &S3;.
   category: Hello
   languages:
+    Java:
+      versions:
+        - sdk_version: 2
+          github: javav2/example_code/s3
+          sdkguide:
+          excerpts:
+            - description:
+              snippet_tags:
+                - s3.java2.hello.main
     Python:
       versions:
         - sdk_version: 3

javav2/example_code/dynamodb/src/main/java/com/example/dynamodb/ListTables.java

@@ -9,6 +9,7 @@
 
 package com.example.dynamodb;
 
+// snippet-start:[dynamodb.java2.list_tables.main]
 // snippet-start:[dynamodb.java2.list_tables.import]
 import software.amazon.awssdk.auth.credentials.ProfileCredentialsProvider;
 import software.amazon.awssdk.regions.Region;
@@ -41,9 +42,7 @@ public static void main(String[] args) {
         ddb.close();
     }
 
-    // snippet-start:[dynamodb.java2.list_tables.main]
     public static void listAllTables(DynamoDbClient ddb){
-
         boolean moreTables = true;
         String lastName = null;
 

javav2/example_code/glue/src/main/java/com/example/glue/HelloGlue.java

@@ -0,0 +1,39 @@
+//snippet-sourcedescription:[GetDatabase.java demonstrates how to get a database.]
+//snippet-keyword:[AWS SDK for Java v2]
+//snippet-keyword:[AWS Glue]
+/*
+   Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+   SPDX-License-Identifier: Apache-2.0
+*/
+
+//snippet-start:[glue.java2.hello.main]
+package com.example.glue;
+
+import software.amazon.awssdk.regions.Region;
+import software.amazon.awssdk.services.glue.GlueClient;
+import software.amazon.awssdk.services.glue.model.ListJobsRequest;
+import software.amazon.awssdk.services.glue.model.ListJobsResponse;
+import java.util.List;
+
+public class HelloGlue {
+
+    public static void main(String[] args){
+        GlueClient glueClient = GlueClient.builder()
+            .region(Region.US_EAST_1)
+            .build();
+
+        listJobs(glueClient);
+    }
+
+    public static void listJobs(GlueClient glueClient) {
+        ListJobsRequest request = ListJobsRequest.builder()
+                .maxResults(10)
+                    .build();
+        ListJobsResponse response = glueClient.listJobs(request);
+        List<String> jobList = response.jobNames();
+        jobList.forEach(job -> {
+            System.out.println("Job Name: " + job);
+        });
+    }
+}
+//snippet-end:[glue.java2.hello.main]

javav2/example_code/iam/src/main/java/com/example/iam/HelloIAM.java

@@ -0,0 +1,43 @@
+//snippet-sourcedescription:[HelloIAM.java demonstrates how to list AWS Identity and Access Management (IAM) policies.]
+//snippet-keyword:[AWS SDK for Java v2]
+//snippet-service:[IAM]
+/*
+   Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+   SPDX-License-Identifier: Apache-2.0
+*/
+
+package com.example.iam;
+
+// snippet-start:[iam.java2.hello.main]
+import software.amazon.awssdk.regions.Region;
+import software.amazon.awssdk.services.iam.IamClient;
+import software.amazon.awssdk.services.iam.model.ListPoliciesResponse;
+import software.amazon.awssdk.services.iam.model.Policy;
+import java.util.List;
+
+/**
+ * Before running this Java V2 code example, set up your development environment, including your credentials.
+ *
+ * For more information, see the following documentation topic:
+ *
+ * https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/get-started.html
+ */
+public class HelloIAM {
+    public static void main(String[] args){
+        Region region = Region.AWS_GLOBAL;
+        IamClient iam = IamClient.builder()
+            .region(region)
+            .build();
+
+        listPolicies(iam);
+    }
+
+    public static void listPolicies(IamClient iam) {
+        ListPoliciesResponse response = iam.listPolicies();
+        List<Policy> polList = response.policies();
+        polList.forEach(policy -> {
+            System.out.println("Policy Name: " + policy.policyName());
+        });
+    }
+}
+// snippet-end:[iam.java2.hello.main]

javav2/example_code/s3/src/main/java/com/example/s3/HelloS3.java

@@ -0,0 +1,49 @@
+//snippet-sourcedescription:[HelloS3.java demonstrates how to list your Amazon Simple Storage Service (Amazon S3) buckets.]
+//snippet-keyword:[AWS SDK for Java v2]
+//snippet-service:[Amazon S3]
+/*
+   Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+   SPDX-License-Identifier: Apache-2.0
+*/
+package com.example.s3;
+
+// snippet-start:[s3.java2.hello.main]
+import software.amazon.awssdk.regions.Region;
+import software.amazon.awssdk.services.s3.S3Client;
+import software.amazon.awssdk.services.s3.model.Bucket;
+import software.amazon.awssdk.services.s3.model.ListBucketsResponse;
+import software.amazon.awssdk.services.s3.model.S3Exception;
+import java.util.List;
+
+/**
+ * Before running this Java V2 code example, set up your development environment, including your credentials.
+ *
+ * For more information, see the following documentation topic:
+ *
+ * https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/get-started.html
+ */
+public class HelloS3 {
+    public static void main(String[] args) {
+        Region region = Region.US_EAST_1;
+        S3Client s3 = S3Client.builder()
+            .region(region)
+            .build();
+
+        listBuckets(s3);
+    }
+
+    public static void listBuckets(S3Client s3) {
+        try {
+            ListBucketsResponse response = s3.listBuckets();
+            List<Bucket> bucketList = response.buckets();
+            bucketList.forEach(bucket -> {
+                System.out.println("Bucket Name: " + bucket.name());
+            });
+
+        } catch (S3Exception e) {
+            System.err.println(e.awsErrorDetails().errorMessage());
+            System.exit(1);
+        }
+    }
+}
+// snippet-end:[s3.java2.hello.main]