B4J Question AWS SNS

'Non-UI application (console / server application)
#Region Project Attributes 
    #CommandLineArgs:
    #MergeLibraries: False 
#End Region
#AdditionalJar: aws-java-sdk-1.11.914.jar
#AdditionalJar: aspectjrt-1.8.2.jar
#AdditionalJar: aspectjweaver.jar
#AdditionalJar: aws-swf-build-tools-1.1.jar
#AdditionalJar: freemarker-2.3.9.jar
#AdditionalJar: javax.mail-api-1.4.6.jar
#AdditionalJar: spring-beans-3.0.7.RELEASE.jar
#AdditionalJar: spring-context-3.0.7.RELEASE.jar
#AdditionalJar: spring-core-3.0.7.RELEASE.jar
#AdditionalJar: spring-test-3.0.7.RELEASE.jar
#AdditionalJar: jmespath-java-1.11.914.jar
#AdditionalJar: netty-buffer-4.1.53.Final.jar
#AdditionalJar: netty-codec-4.1.53.Final.jar
#AdditionalJar: netty-codec-http-4.1.53.Final.jar
#AdditionalJar: netty-common-4.1.53.Final.jar
#AdditionalJar: netty-handler-4.1.53.Final.jar
#AdditionalJar: netty-resolver-4.1.53.Final.jar
#AdditionalJar: netty-transport-4.1.53.Final.jar
#AdditionalJar: jackson-databind-2.6.7.4.jar
#AdditionalJar: httpclient-4.5.13.jar
#AdditionalJar: httpcore-4.4.13.jar
#AdditionalJar: commons-codec-1.11.jar
#AdditionalJar: commons-logging-1.1.3.jar
#AdditionalJar: ion-java-1.0.2.jar
#AdditionalJar: jackson-annotations-2.6.0.jar
#AdditionalJar: jackson-core-2.6.7.jar
#AdditionalJar: jackson-dataformat-cbor-2.6.7.jar
#AdditionalJar: joda-time-2.8.1.jar

Sub Process_Globals
    
End Sub

Sub AppStart (Args() As String)
    Dim jo As JavaObject = Me
    jo.RunMethod("SendSms", Array("access key", "secret access key", "message", "+23423423"))
    StartMessageLoop
End Sub

#if Java
import com.amazonaws.auth.AWSStaticCredentialsProvider;
import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.sns.AmazonSNS;
import com.amazonaws.services.sns.AmazonSNSClient;
import com.amazonaws.services.sns.model.PublishRequest;

public static void SendSms(String AccessKey, String SecretAccessKey, String Message, String MobileNumber) {
    BasicAWSCredentials awsCreds = new BasicAWSCredentials(AccessKey, SecretAccessKey);
        
        //Create SNS Client
        AmazonSNS snsClient = AmazonSNSClient
                .builder()
                .withRegion(Regions.AP_SOUTHEAST_2)
                .withCredentials(new AWSStaticCredentialsProvider(awsCreds))
                .build();
        
        String SMSMessage = Message;
        String mobile = MobileNumber;
        
        snsClient.publish(new PublishRequest().withMessage(SMSMessage).withPhoneNumber(mobile));
}
#End If

#Region Project Attributes
    #MainFormWidth: 600
    #MainFormHeight: 600
    #CommandLineArgs:
    #MergeLibraries: True
#End Region

'select JavaObject library for this project
'requires Java 11 due to static interface method invocations

'get jar files from https://mvnrepository.com/artifact/software.amazon.awssdk/
'put into AdditionalLibraries directory
#AdditionalJar: sdk-core-2.16.5.jar
#AdditionalJar: auth-2.16.5.jar
#AdditionalJar: regions-2.16.5.jar
#AdditionalJar: protocol-core-2.16.5.jar
#AdditionalJar: apache-client-2.16.5.jar
#AdditionalJar: utils-2.16.5.jar
#AdditionalJar: http-client-spi-2.16.5.jar
#AdditionalJar: aws-core-2.16.5.jar
#AdditionalJar: metrics-spi-2.16.5.jar
#AdditionalJar: profiles-2.16.5.jar
#AdditionalJar: aws-query-protocol-2.16.5.jar
'include service-specific jar files as needed
#AdditionalJar: sns-2.16.5.jar

'get these dependencies from https://mvnrepository.com/
#AdditionalJar: reactive-streams-1.0.3.jar
#AdditionalJar: httpclient-4.5.13.jar
#AdditionalJar: httpcore-4.4.14.jar
#AdditionalJar: commons-logging-1.2.jar
#AdditionalJar: slf4j-api-1.7.30.jar
#AdditionalJar: slf4j-simple-1.7.30.jar
'#AdditionalJar: slf4j-nop-1.7.30.jar

Sub Process_Globals
    Private fx As JFX
    Private MainForm As Form
    Private xui As XUI
    Private Button1 As B4XView
End Sub

Sub AppStart (Form1 As Form, Args() As String)
    MainForm = Form1
    MainForm.RootPane.LoadLayout("Layout1")
    MainForm.Show
    DateTime.DateFormat="yyyy-MM-dd HH:mm:ss"
End Sub

Sub Button1_Click
    Dim jo As JavaObject = Me
    jo.RunMethod("SendSms", Array("access key", "secret access key", DateTime.Date(DateTime.Now), "+12025550113"))
    xui.MsgboxAsync("Message sent!", "B4X")
End Sub

#if Java
import software.amazon.awssdk.auth.credentials.AwsBasicCredentials;
import software.amazon.awssdk.auth.credentials.AwsCredentialsProvider;
import software.amazon.awssdk.auth.credentials.StaticCredentialsProvider;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.sns.SnsClient;
import software.amazon.awssdk.services.sns.model.PublishRequest;
import software.amazon.awssdk.services.sns.model.PublishResponse;

public static void SendSms(String AccessKey, String SecretAccessKey, String Message, String MobileNumber) {

    //Must be one of ("trace", "debug", "info", "warn", "error" or "off"). If not specified, defaults to "info".
    System.setProperty(org.slf4j.impl.SimpleLogger.DEFAULT_LOG_LEVEL_KEY, "info");
    
    AwsBasicCredentials    awsCreds = AwsBasicCredentials.create(AccessKey, SecretAccessKey);
    AwsCredentialsProvider awsCredProv = StaticCredentialsProvider.create(awsCreds);
        
        SnsClient sc = SnsClient.builder()
                        .region(Region.US_EAST_1)
                        .credentialsProvider(awsCredProv)
                        .build();
        
        String SMSMessage = Message;
        String mobile = MobileNumber;
        
        PublishRequest pubReq = PublishRequest.builder()
            .message(SMSMessage)
            .phoneNumber(mobile)
            .build();
        PublishResponse result = sc.publish(pubReq);

        System.out.println(result); // Prints the message ID.
}
#End If

#AdditionalJar: url-connection-client-2.16.5.jar

    System.setProperty("software.amazon.awssdk.http.service.impl", "software.amazon.awssdk.http.urlconnection.UrlConnectionSdkHttpService");