Thread: how to achieve thin driver Connection to oracle XE database?

I have been known that there are many ways to connect to any database but I came into problems while trying to connect to Oracle XE database.

Database is freshly installed on local machine. Connection succeeds when connected via SQL+. Making Java web app access it is what creating trouble here. please look at that code ( I know not formally written and Sorry for that but understoodable.

String username = request.getParameter("username");
		String password = request.getParameter("password");
 
		PrintWriter out = response.getWriter();
		try {
			Class.forName("oracle.jdbc.driver.OracleDriver");
		int pass = Integer.parseInt(password);
        String serverName = null;
        //String sid = null;
        String portNumber = "1521";
        String dusername = "system";
        String dpassword = "honour";
 
        serverName = "localhost";
        String url = "jdbc:oracle:thin:@" + serverName + ":" + portNumber +":xe,'"+dusername+"','"+dpassword+"'";
        Connection conn = null;
 
        conn = DriverManager.getConnection(url);

last line is where issue happens. Also please look at server console below :

java.sql.SQLException: Listener refused the connection with the following error:
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor

at oracle.jdbc.driver.T4CConnection.logon(T4CConnecti on.java:489)
at oracle.jdbc.driver.PhysicalConnection.<init>(Physi calConnection.java:553)
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnect ion.java:254)
at oracle.jdbc.driver.T4CDriverExtension.getConnectio n(T4CDriverExtension.java:32)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriv er.java:528)
at java.sql.DriverManager.getConnection(DriverManager .java:571)
at java.sql.DriverManager.getConnection(DriverManager .java:233)
at logger.Logger.processRequest(Logger.java:49)
at logger.Logger.doPost(Logger.java:27)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:647)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:728)
at org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.do Filter(ApplicationFilterChain.java:210)
at org.apache.tomcat.websocket.server.WsFilter.doFilt er(WsFilter.java:51)
at org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.do Filter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invo ke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invo ke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBas e.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke( StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(A ccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invok e(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.servic e(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.p rocess(AbstractHttp11Processor.java:1041)
at org.apache.coyote.AbstractProtocol$AbstractConnect ionHandler.process(AbstractProtocol.java:603)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProce ssor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker( ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
Caused by: oracle.net.ns.NetException: Listener refused the connection with the following error:
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor

at oracle.net.ns.NSProtocol.connect(NSProtocol.java:3 99)
at oracle.jdbc.driver.T4CConnection.connect(T4CConnec tion.java:1140)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnecti on.java:340)
... 29 more

I identified the issue as the error states but I don't know how to resolve it. I'll be glad if you help me out. please tell me what changes I need to make in my connection string so as to make it work.
Hoping to have replies from Gurus.
Thank you

Check all the oracle services should start in your machine.