java.sql.SQLNonTransientConnectionException: Could not create connection to database server.
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:676)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:663)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:653)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:638)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:606)
    at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:1837)
    at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:1653)
    at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:662)
    at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:352)
    at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:221)
    at java.sql.DriverManager.getConnection(DriverManager.java:664)
    at java.sql.DriverManager.getConnection(DriverManager.java:270)
    at com.example.endpoints.insertUser.doPost(insertUser.java:160)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
    at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:821)
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:583)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1158)
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:511)
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1090)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
    at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:213)
    at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:109)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:119)
    at org.eclipse.jetty.server.Server.handle(Server.java:517)
    at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:306)
    at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:242)
    at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:261)
    at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)
    at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:75)
    at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceAndRun(ExecuteProduceConsume.java:213)
    at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:147)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:654)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:572)
    at java.lang.Thread.run(Thread.java:745)

**Caused by: java.lang.ClassCastException: com.google.cloud.sql.mysql.SocketFactory cannot be cast to com.mysql.cj.api.io.SocketFactory**


    at com.mysql.cj.core.io.AbstractSocketConnection.createSocketFactory(AbstractSocketConnection.java:129)
    at com.mysql.cj.mysqla.io.MysqlaSocketConnection.connect(MysqlaSocketConnection.java:56)
    at com.mysql.cj.mysqla.MysqlaSession.connect(MysqlaSession.java:144)
    at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:1783)
    ... 33 more

"jdbc:mysql://google/*****?cloudSqlInstance=******&socketFactory=com.google.cloud.sql.mysql.SocketFactory&user=****&password=****&useSSL=true"