Java AWS Dynamo DB create Client

AWSDynamoDBHandler.java

import com.amazonaws.regions.Regions;
import com.amazonaws.services.dynamodbv2.AmazonDynamoDB;
import com.amazonaws.services.dynamodbv2.AmazonDynamoDBClientBuilder;
import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper;
import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapperConfig;
import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapperConfig.TableNameOverride;
import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBQueryExpression;
import com.amazonaws.services.dynamodbv2.model.AttributeValue;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import java.util.HashMap;
import java.util.Map;

class AWSDynamoDBHandler {

    private static Logger LOG = LogManager.getLogger(AWSDynamoDBHandler.class.getName());
    private AmazonDynamoDB client;
    private String tableName;


    public AWSDynamoDBHandler(EnvironmentProvider tableNameProvider) {
        this.tableName = tableNameProvider.getValue();
        createClient();
    }

    /**
     * Get an active client to the AWS dynamo DB in EU-Central-West
     *
     * @return Active Client
     */
    private void createClient() {
        LOG.debug("get amazon dynamo db client");

        //create client if not initialized
        if (client == null) {
            LOG.debug("dyanmo db client is not created - build it now");
            // This client will connect to EU CENTRAL 1 (Frankfurt)
            client = AmazonDynamoDBClientBuilder.standard()
                    .withRegion(Regions.EU_CENTRAL_1)
                    .build();

            LOG.debug("client created");
        }
    }

    DynamoDBMapper getDynamoDBMapper() {
        return new DynamoDBMapper(client, DynamoDBMapperConfig.builder().withTableNameOverride(new TableNameOverride(tableName)).build());
    }


    DynamoDBQueryExpression buildQueryWithPrimaryKey(String primaryKeyName, String primaryKeyValue) {
        Map<String, AttributeValue> valueMap = new HashMap<>();
        valueMap.put(":v1", new AttributeValue().withS(primaryKeyValue));

        //query
        DynamoDBQueryExpression dynamoDBQueryExpression = new DynamoDBQueryExpression().withKeyConditionExpression(primaryKeyName+" = :v1").withExpressionAttributeValues(valueMap);

        return dynamoDBQueryExpression;
    }

    void saveObject(Object object) {
        getDynamoDBMapper().save(object);
    }
}

Maven Import

<!-- AWS DynamoDB Import --> <dependency> <groupId>com.amazonaws</groupId> <artifactId>aws-java-sdk-dynamodb</artifactId> <version>1.11.483</version> </dependency>