SSM Parameter Store as properties for Lambda

implement.java

public class Config {
private SsmParamUtil ssmParamUtil;

public void init() {
//read environment and setup property collector
ssmParamUtil = new SsmParamUtil(prefix, AWSSimpleSystemsManagementClientBuilder.defaultClient());
}

public String getValue(String key) {
        if(ssmParamUtil != null) {
            String ssmValue = (String)ssmParamUtil.getProperty(key);
            if (!StringUtils.isNullOrEmpty(ssmValue)){
                return ssmValue;
            }
        }
        return null;
}
}

SsmParamUtil.java

import com.amazonaws.services.simplesystemsmanagement.AWSSimpleSystemsManagement;
import com.amazonaws.services.simplesystemsmanagement.model.GetParametersByPathRequest;
import com.amazonaws.services.simplesystemsmanagement.model.GetParametersByPathResult;
import com.amazonaws.services.simplesystemsmanagement.model.Parameter;

import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;

public class SsmParamUtil {

    private String context;

    private Map<String, Object> properties = new LinkedHashMap<>();

    private AWSSimpleSystemsManagement ssmClient;

    public SsmParamUtil(String context, AWSSimpleSystemsManagement ssmClient) {
        this.context = context;
        this.ssmClient = ssmClient;
    }

    public void init() {
        GetParametersByPathRequest paramsRequest = new GetParametersByPathRequest()
            .withPath(context).withRecursive(true).withWithDecryption(true);
        getParameters(paramsRequest);
    }

    public String[] getPropertyNames() {
        Set<String> strings = properties.keySet();
        return strings.toArray(new String[strings.size()]);
    }

    public Object getProperty(String name) {
        return properties.get(name);
    }

    private void getParameters(GetParametersByPathRequest paramsRequest) {
        GetParametersByPathResult paramsResult = ssmClient
            .getParametersByPath(paramsRequest);
        for (Parameter parameter : paramsResult.getParameters()) {
            String key = parameter.getName().replace(context, "").replace('/', '.');
            properties.put(key, parameter.getValue());
        }
        if (paramsResult.getNextToken() != null) {
            getParameters(paramsRequest.withNextToken(paramsResult.getNextToken()));
        }
    }
}