Some questions about WP API V2 Client

[hasanli-orkhan]

Hello!
First of all, thank you so much for this java client.
I have some questions and because of the lack of documentation I would like to clarify them with you. Hope you take some time with me. Thank you in advance!
Is client version 4.13.x working?
I have builded jar in Intellij IDEA ( empty jar or jar from modules with dependencies) and try the snippet below I get another exception:

16:38:05.860 [main] ERROR c.a.w.wpapi.v2.util.MavenProperties - Error loading properties 
java.lang.NullPointerException: null
	at java.util.Properties$LineReader.readLine(Properties.java:434) ~[na:1.8.0_191]
	at java.util.Properties.load0(Properties.java:353) ~[na:1.8.0_191]
	at java.util.Properties.load(Properties.java:341) ~[na:1.8.0_191]
	at com.afrozaar.wordpress.wpapi.v2.util.MavenProperties.getProperties(MavenProperties.java:19) ~[wp-api-v2-client-java.jar:4.1.7.RELEASE]
	at com.afrozaar.wordpress.wpapi.v2.Client.<init>(Client.java:90) [wp-api-v2-client-java.jar:4.1.7.RELEASE]
	at com.afrozaar.wordpress.wpapi.v2.Client.<init>(Client.java:95) [wp-api-v2-client-java.jar:4.1.7.RELEASE]
	at com.afrozaar.wordpress.wpapi.v2.config.ClientFactory.fromConfig(ClientFactory.java:12) [wp-api-v2-client-java.jar:4.1.7.RELEASE]
	at testt.test.main(test.java:22) [classes/:na]
16:38:06.604 [main] DEBUG c.afrozaar.wordpress.wpapi.v2.Client - Request Entity: <POST https://md7.info?rest_route=/wp/v2/posts,{author=[null], content=test, title=test, status=publish},{User-Agent=[null/null], Authorization=[Basic YWRtaW46Z2xvYmFsbmV0d29yazI0], Content-Type=[application/json]}>
com.afrozaar.wordpress.wpapi.v2.exception.PostCreateException: 400 Bad Request parameter: author
	at com.afrozaar.wordpress.wpapi.v2.Client.createPost(Client.java:146)
	at com.afrozaar.wordpress.wpapi.v2.Client.createPost(Client.java:152)
	at testt.test.main(test.java:35)
Caused by: org.springframework.web.client.HttpClientErrorException: 400 Bad Request
	at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:91)
	at org.springframework.web.client.RestTemplate.handleResponse(RestTemplate.java:614)
	at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:570)
	at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:545)
	at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:507)
	at com.afrozaar.wordpress.wpapi.v2.Client.doExchange0(Client.java:1007)
	at com.afrozaar.wordpress.wpapi.v2.Client.doExchange0(Client.java:1013)
	at com.afrozaar.wordpress.wpapi.v2.Client.doExchange1(Client.java:1034)
	at com.afrozaar.wordpress.wpapi.v2.Client.createPost(Client.java:144)
	... 2 more

Snippet which I used to test the client:

public class test {
  public static void main(String[] args) {
    String url = "https://example.com";
    String login = "admin";
    String password = "12345";
    final Wordpress client = ClientFactory.fromConfig(ClientConfig.of(
            url, login, password, false, true
    ));
    String articleTitle = "test";
    String articleContent = "test";
    final Post post = PostBuilder.aPost()
            .withTitle(TitleBuilder.aTitle().withRendered(articleTitle).build())
            .withContent(ContentBuilder.aContent().withRendered(articleContent).build())
            .build();
    try {
      final Post createdPost = client.createPost(post, PostStatus.publish);
    } catch (PostCreateException e) {
      e.printStackTrace();
    }

  }
}

P.S. When I use this snippet with the client version 4.8.3 (from mvnrepository) It works well. Link

Links to builded jar:
https://send.firefox.com/download/6b87ae513fe90145/#4A71Xr6QLSwcQunFT-qTpw

P.P.S. And what about JWT authentication?
Thanks again!