How to correctly attach a security certificate (SSL) to HikariCP Mysql connection to a Java base?

Question

MySQL

My cloud, where the mysql cluster is located, only allows you to connect using an SSL certificate. The application that needs to connect to the database connects to the database through a connection pool - HikariCP.
I use:
Mysql 5.7
Java 8
HikariCP 3.3.1

try {
      DatabaseConfig.DATABASE_DRIVER.newInstance();
    }
    catch (Exception e) {
      log.error("[MySQLDatabaseFactory]: Error obtaining DB driver", e);
      throw new Error("[MySQLDatabaseFactory]: DB Driver doesnt exist!");
    }

    HikariConfig config = new HikariConfig();
    config.setMaximumPoolSize(DatabaseConfig.DATABASE_CONNECTIONS_MAX);
    config.setConnectionTimeout(DatabaseConfig.DATABASE_TIMEOUT);
    config.setDataSourceClassName(DatabaseConfig.DATABASE_DRIVER.getName());
    config.addDataSourceProperty("url", DatabaseConfig.DATABASE_URL);
    config.addDataSourceProperty("user", DatabaseConfig.DATABASE_USER);
    config.addDataSourceProperty("password", DatabaseConfig.DATABASE_PASSWORD);

    dataSource = new HikariDataSource(config);

    try {
      Connection c = getConnection();
      DatabaseMetaData dmd = c.getMetaData();
      databaseName = dmd.getDatabaseProductName();
      c.close();
    }
    catch (Exception e) {
      log.error("[MySQLDatabaseFactory]: Error with connection string: " + DatabaseConfig.DATABASE_URL, e);
      throw new Error("[MySQLDatabaseFactory]: DatabaseFactory not initialized!");
    }

    log.info("Successfully connected to database");

I can't connect using an SSL certificate - .pem extension Please tell me
how to do it right.
Error when starting without specified SSL

Mistake

2019-04-19 21:49:52,644 HikariPool-1 - Exception during pool initialization.
com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
  at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:174)
  at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:64)
  at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:832)
  at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:456)
  at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:240)
  at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:207)
  at com.mysql.cj.jdbc.MysqlDataSource.getConnection(MysqlDataSource.java:393)
  at com.mysql.cj.jdbc.MysqlDataSource.getConnection(MysqlDataSource.java:125)
  at com.mysql.cj.jdbc.MysqlDataSource.getConnection(MysqlDataSource.java:110)
  at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:353)
  at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:201)
  at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:473)
  at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:562)
  at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:115)
  at com.zaxxer.hikari.HikariDataSource.<init>(HikariDataSource.java:81)
Caused by: com.mysql.cj.exceptions.CJCommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
  at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
  at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
  at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
  at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
  at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61)
  at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:105)
  at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:151)
  at com.mysql.cj.exceptions.ExceptionFactory.createCommunicationsException(ExceptionFactory.java:167)
  at com.mysql.cj.protocol.a.NativeProtocol.negotiateSSLConnection(NativeProtocol.java:351)
  at com.mysql.cj.protocol.a.NativeAuthenticationProvider.negotiateSSLConnection(NativeAuthenticationProvider.java:796)
  at com.mysql.cj.protocol.a.NativeAuthenticationProvider.proceedHandshakeWithPluggableAuthentication(NativeAuthenticationProvider.java:503)
  at com.mysql.cj.protocol.a.NativeAuthenticationProvider.connect(NativeAuthenticationProvider.java:220)
  at com.mysql.cj.protocol.a.NativeProtocol.connect(NativeProtocol.java:1443)
  at com.mysql.cj.NativeSession.connect(NativeSession.java:165)
  at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:952)
  at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:822)
  ... 14 common frames omitted
Caused by: javax.net.ssl.SSLHandshakeException: java.security.cert.CertificateException: java.security.cert.CertPathValidatorException: Path does not chain with any of the trust anchors
  at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
  at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1946)
  at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:316)
  at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:310)
  at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1639)
  at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:223)
  at sun.security.ssl.Handshaker.processLoop(Handshaker.java:1037)
  at sun.security.ssl.Handshaker.process_record(Handshaker.java:965)
  at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1064)
  at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1367)
  at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1395)
  at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1379)
  at com.mysql.cj.protocol.ExportControlled.performTlsHandshake(ExportControlled.java:315)
  at com.mysql.cj.protocol.StandardSocketFactory.performTlsHandshake(StandardSocketFactory.java:206)
  at com.mysql.cj.protocol.a.NativeSocketConnection.performTlsHandshake(NativeSocketConnection.java:99)
  at com.mysql.cj.protocol.a.NativeProtocol.negotiateSSLConnection(NativeProtocol.java:347)
  ... 21 common frames omitted