error trying to connect with the program in java with oracle database

[Albert Albertm]

I have oracle linux 6.5, Oracle Database 11g Enterprise Edition Release 11.2.0.1.0

I wrote a test program in NetBeans to connect to the oracle database
during the start of the program I get the error below

why?

SQL * Plus connects to the data without any problem also
Oracle SQL Developer connects to the data without a problem

library project poloczzora added ojdbc6.jar


program:


package poloczzora;

import java.sql.*;

public class Poloczzora {

/**
* @param args the command line arguments
*/
public static void main(String[] args) throws Exception {


try {

Class.forName("oracle.jdbc.OracleDriver");
} catch (java.lang.ClassNotFoundException e) {
System.err.print("Error: ClassNotFoundException");
}

Connection conn = DriverManager.getConnection
("jdbc:oracle:thin:@//localhost:1521/orcl", "scott", "tiger");
}

}






Exception in thread "main" java.sql.SQLException: The Network Adapter could not establish the connection
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:412) at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:412)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:412)
calConnection.java:531)
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:221)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:32)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:503)
at java.sql.DriverManager.getConnection(DriverManager.java:571)
at java.sql.DriverManager.getConnection(DriverManager.java:215)
at poloczzora.Poloczzora.main(Poloczzora.java:41)
Caused by: oracle.net.ns.NetException: The Network Adapter could not establish the connection
at oracle.net.nt.ConnStrategy.execute(ConnStrategy.java:359)
at oracle.net.resolver.AddrResolution.resolveAndExecute(AddrResolution.java:422)
at oracle.net.ns.NSProtocol.establishConnection(NSProtocol.java:672)
at oracle.net.ns.NSProtocol.connect(NSProtocol.java:353)
at oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1042)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:301)
... 7 more
Caused by: java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:579)
at oracle.net.nt.TcpNTAdapter.connect(TcpNTAdapter.java:141)
at oracle.net.nt.ConnOption.connect(ConnOption.java:123)
at oracle.net.nt.ConnStrategy.execute(ConnStrategy.java:337)
... 12 more
Java Result: 1
BUILD SUCCESSFUL (total time: 14 seconds)

[K. Tsang]

I believe the user "scott" is disabled by default. Try enabling the account and try again. Or create your user for the database you are working with and use that.

[Albert Albertm]

scott
the user is active

I log on to his account from sql plus and SQL Developer

[Paul Clapham]

"Connection refused" most likely means "There's no server listening on that port". So... you don't have anything running on your computer (localhost) listening at port 1521, right?