cognitoAuthentication | Cognito Authentication in a Spring Boot Application | Authentication library

I am learning integrating AWS with an ASP .NET Core site. I am using AWS Cognito as a user store. I have created a sign-up form which actually acts as an interface to AWS Cognito. So far I have done the following steps:

1. Created an User Pool in AWS Cognito.

2. Created an User in IAM service. Attached the existing policy "AmazonCognitoDeveloperAuthenticatedIdentities" to this User.

3. Created a credentials file in Windows in the user profile directory. Set the aws_access_key_id and aws_secret_access_key in this file

4. In the appsettings.json file created an AWS section and set keys as below (I have hidden the User Pool Client Secret):

   ...

I built this Java Project on GitHub by Creating a Maven Project in Eclipse IDE for Enterprise Java Developers Version: 2019-03 (4.11.0), Build id: 20190314-1200 and copying the pom.xml file and src folder into my project and updated the project with Maven. When I run the project as a Java Application in Tomcat$1 - org.apache.catalina.startup, I get this in the Console View:

Error: A JNI error has occurred, please check your installation and try again

I checked a lot of the other stackoverflow posts similar to this with this error message, and none of them worked. There are some that are within a different context.

Any help is appreciated.

Updated visual studio to 15.8.5 and AWS library AWSSDK.Extensions.CognitoAuthentication stopped working with error above

I am trying to find the correct version configurations in order to utilize the Xamarin.Facebook.Android package and still be able to support Lollipop (the latest version seems to only support Nougat).

I installed many necessary packages, but now I get an error while building that I can't seem to get rid of.

java.lang.IllegalArgumentException: already added : Lbolts/AggregateException;

My googling suggested that this error is generally caused by having multiples of one package. I couldn't figure out how to fix the problem.

Here is the list of installed packages for the project. Any help would be much appreciated! (Sorry for the length)

AWSSDK.APIGateway {3.3.8}
AWSSDK.CognitoIdentity {3.3.2.14}
AWSSDK.CognitoIdentityProvider {3.3.6}
AWSSDK.CognitoSync {3.3.1.23}
AWSSDK.Core {3.3.17.8}
AWSSDK.DynamoDBv2 {3.3.4.17}
AWSSDK.Extensions.CognitoAuthentication {0.9.1}
AWSSDK.IdentityManagement {3.3.4.3}
AWSSDK.S3 {3.3.10.4}
AWSSDK.SecurityToken {3.3.3}
AWSSDK.SimpleNotificationService {3.3.0.21}
AWSSDK.SQS {3.3.2.7}
Bolts {1.4.0.1}
Microsoft.Bcl {1.1.10}
Microsoft.Bcl.Build {1.0.21}
Microsoft.CSharp {4.4.0}
Microsoft.Net.Http {2.2.29}
Microsoft.NETCore.Platforms {2.0.0}
Microsoft.Win32.Primitives {4.3.0}
NETStandard.Library {2.0.0}
Newtonsoft.Json {10.0.3}
PCLCrypto {2.0.147}
PCLStorage {1.0.2}
PInvoke.BCrypt {0.3.2}
PInvoke.Kernel32 {0.3.2}
PInvoke.NCrypt {0.3.2}
PInvoke.Windows.Core {0.3.2}
SQLitePCLRaw.bundle_green {1.1.8}
SQLitePCLRaw.core {1.1.8}
SQLitePCLRaw.lib.e_sqlite3.android {1.1.8}
SQLitePCLRaw.provider.e_sqlite3.android {1.1.8}
System.AppContext {4.3.0}
System.Collections {4.3.0}
System.Collections.Concurrent {4.3.0}
System.Collections.NonGeneric {4.3.0}
System.ComponentModel.TypeConverter {4.3.0}
System.Console {4.3.0}
System.Diagnostics.Debug {4.3.0}
System.Diagnostics.Tools {4.3.0}
System.Diagnostics.Tracing {4.3.0}
System.Globalization {4.3.0}
System.Globalization.Calendars {4.3.0}
System.IO {4.3.0}
System.IO.Compression {4.3.0}
System.IO.Compression.ZipFile {4.3.0}
System.IO.FileSystem {4.3.0}
System.IO.FileSystem.Primitives {4.3.0}
System.Linq {4.3.0}
System.Linq.Expressions {4.3.0}
System.Net.Http {4.3.2}
System.Net.Primitives {4.3.0}
System.Net.Sockets {4.3.0}
System.ObjectModel {4.3.0}
System.Reflection {4.3.0}
System.Reflection.Extensions {4.3.0}
System.Reflection.Primitives {4.3.0}
System.Resources.ResourceManager {4.3.0}
System.Runtime {4.3.0}
System.Runtime.Extensions {4.3.0}
System.Runtime.Handles {4.3.0}
System.Runtime.InteropServices {4.3.0}
System.Runtime.InteropServices.RuntimeInformation {4.3.0}
System.Runtime.Numerics {4.3.0}
System.Runtime.Serialization.Formatters {4.3.0}
System.Runtime.Serialization.Primitives {4.3.0}
System.Security.Cryptography.Algorithms {4.3.0}
System.Security.Cryptography.Encoding {4.3.0}
System.Security.Cryptography.Primitives {4.3.0}
System.Security.Cryptography.X509Certificates {4.3.0}
System.Text.Encoding {4.3.0}
System.Text.Encoding.Extensions {4.3.0}
System.Text.RegularExpressions {4.3.0}
System.Threading {4.3.0}
System.Threading.Tasks {4.3.0}
System.Threading.Timer {4.3.0}
System.Xml.ReaderWriter {4.3.0}
System.Xml.XDocument {4.3.0}
System.Xml.XmlDocument {4.3.0}
Validation {2.4.15}
Xamarin.Android.Support.Animated.Vector.Drawable {23.4.0.1}
Xamarin.Android.Support.CustomTabs {23.4.0.1}
Xamarin.Android.Support.v4 {23.4.0.1}
Xamarin.Android.Support.v7.AppCompat {23.4.0.1}
Xamarin.Android.Support.v7.CardView {23.4.0.1}
Xamarin.Android.Support.Vector.Drawable {23.4.0.1}
Xamarin.Facebook.Android {4.16.1}