Unable to execute HTTP request - DynamoDB Local Maven Dependency

Question

According to the documentation of Dynamo DB, we can install DynamoDB locally via Maven dependency as well. Just need to include the dependency and repository in the POM File. Use case: https://forums.aws.amazon.com/thread.jspa?threadID=180367

So, I have written a code in Java which just creates a table and I have included the DynamoDBLocal dependency in the pom file as well.

Java Code:

public void createTable(String tableName) {

        CreateTableRequest request = new CreateTableRequest()
                .withAttributeDefinitions(new AttributeDefinition(
                        "Name", ScalarAttributeType.S))
                .withKeySchema(new KeySchemaElement("Name", KeyType.HASH))
                .withProvisionedThroughput(new ProvisionedThroughput(
                        10L, 10L))
                .withTableName(tableName);

        final AmazonDynamoDB ddb = AmazonDynamoDBClientBuilder.standard()
                .withEndpointConfiguration(new AwsClientBuilder.EndpointConfiguration("http://localhost:8000", "us-west-2"))
                .build();

        try {
            CreateTableResult result = ddb.createTable(request);
            System.out.println(result.getTableDescription().getTableName());
        } catch (AmazonServiceException e) {
            System.err.println(e.getErrorMessage());
            System.exit(1);
        }

pom.xml

<dependencies>
        <dependency>
            <groupId>com.amazonaws</groupId>
            <artifactId>DynamoDBLocal</artifactId>
            <version>[1.12,2.0)</version>
        </dependency>
    </dependencies>
    <!--Custom repository:-->
    <repositories>
        <repository>
            <id>dynamodb-local-oregon</id>
            <name>DynamoDB Local Release Repository</name>
            <url>https://s3-us-west-2.amazonaws.com/dynamodb-local/release</url>
        </repository>
    </repositories>

I am getting the following error, while running the code. Can somebody help me out here?

Exception in thread "main" com.amazonaws.SdkClientException: Unable to execute HTTP request: Connect to localhost:8000 [localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] failed: Connection refused (Connection refused)
    at com.amazonaws.http.AmazonHttpClient$RequestExecutor.handleRetryableException(AmazonHttpClient.java:1207)
    at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeHelper(AmazonHttpClient.java:1153)
    at com.amazonaws.http.AmazonHttpClient$RequestExecutor.doExecute(AmazonHttpClient.java:802)
    at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeWithTimer(AmazonHttpClient.java:770)
    at com.amazonaws.http.AmazonHttpClient$RequestExecutor.execute(AmazonHttpClient.java:744)
    at com.amazonaws.http.AmazonHttpClient$RequestExecutor.access$500(AmazonHttpClient.java:704)
    at com.amazonaws.http.AmazonHttpClient$RequestExecutionBuilderImpl.execute(AmazonHttpClient.java:686)
    at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:550)
    at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:530)
    at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.doInvoke(AmazonDynamoDBClient.java:6164)
    at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.invoke(AmazonDynamoDBClient.java:6131)
    at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.executeCreateTable(AmazonDynamoDBClient.java:1154)
    at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.createTable(AmazonDynamoDBClient.java:1119)
    at DynamoDB.createTable(DynamoDB.java:30)
    at main.main(main.java:4)

Answer 1

1. Add this plugin config.
   This is for copying the binary libs to your target dir.

    <dependency>
        <groupId>org.mockito</groupId>
        <artifactId>mockito-core</artifactId>
        <scope>test</scope>
    </dependency>


    <dependency>
        <groupId>software.amazon.awssdk</groupId>
        <artifactId>dynamodb</artifactId>
    </dependency>

    
    <dependency>
        <groupId>com.amazonaws</groupId>
        <artifactId>DynamoDBLocal</artifactId>
        <version>1.12.0</version>
        <scope>test</scope>
    </dependency>

    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

<repositories>
    <repository>
        <id>dynamodb-local</id>
        <name>DynamoDB Local Release Repository</name>
        <url>https://s3-us-west-2.amazonaws.com/dynamodb-local/release</url>
    </repository>
</repositories>

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-dependency-plugin</artifactId>
            <version>2.10</version>
            <executions>
                <execution>
                    <id>copy</id>
                    <phase>test-compile</phase>
                    <goals>
                        <goal>copy-dependencies</goal>
                    </goals>
                    <configuration>
                        <includeScope>test</includeScope>
                        <includeTypes>so,dll,dylib</includeTypes>
                        <outputDirectory>${project.basedir}/target/native-libs</outputDirectory>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>
    <pluginManagement>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <configuration>
                    <systemPropertyVariables>
                        <sqlite4java.library.path>${project.build.directory}/native-libs</sqlite4java.library.path>
                    </systemPropertyVariables>
                </configuration>
            </plugin>
        </plugins>
    </pluginManagement>
</build>

2. Create server before creating a table.
   Your local dynamoDB server must be running before you start submitting requests. If you are not doing this, this might explain why you are getting connection refused. You can copy the rule for creating server from here
   Once you have the above class you just need to add this member variable to your tests.

   @ClassRule static final LocalDynamoDBCreationRule server = new LocalDynamoDBCreationRule (); This makes sure that you have a running server before you start running your tests.