How to install a certificate in the Jersey client for authentication on the server?

Question

Java

Good afternoon.
Generated x.509 server and client certificates, keystore, truststore based on the article
" https://dzone.com/articles/securing-rest-apis-with... "
On the server (Spring-boot 2.1) enabled https. Imported the client keystore (.p12) into the browser, the server responds, everything is ok.
On the java client I use jersey client 2.26

, the setup is as follows:

HostnameVerifier allHostsValid = (hostname, session) -> true;
 SslConfigurator sslConfig = SslConfigurator.newInstance()
                    .keyStoreFile("/path/to/client/keystore/client.p12")
                    .keyStoreType("PKCS12")
                    .keyPassword("password");

  SSLContext sslContext = sslConfig.createSSLContext();
  Client client = ClientBuilder.newBuilder()
                                            .sslContext(sslContext)
                                            .hostnameVerifier(allHostsValid)
                                            .register(feature)
                                            .build();

When I make a request to the server, I get:

SunCertPathBuilderException: unable to find valid certification path to requested target

With commented out line

.sslContext(getSslContext(

)) the same error.
because the server-browser connection is working, I'm setting up the jersey client incorrectly.