Java HotSpot Virtual Machine

Hello there, I have a simple java class that uses an Oracle database and I'm having problem with numeric fields that contain decimals... I want to use a dot instead of a coma. But when I do, I obtain the following error:

java.sql.SQLException: ORA-01722: Nombre non valide

	at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:138)
	at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:316)
	at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:282)
	at oracle.jdbc.driver.T4C8Oall.receive(T4C8Oall.java:639)
	at oracle.jdbc.driver.T4CStatement.doOall8(T4CStatement.java:113)
	at oracle.jdbc.driver.T4CStatement.execute_for_describe(T4CStatement.java:431)
	at oracle.jdbc.driver.OracleStatement.execute_maybe_describe(OracleStatement.java:1029)
	at oracle.jdbc.driver.T4CStatement.execute_maybe_describe(T4CStatement.java:463)
	at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1126)
	at oracle.jdbc.driver.OracleStatement.executeQuery(OracleStatement.java:1274)
	at DBTest.main(DBTest.java:16)

And here is my code ( I've simplified it ):

import java.io.*;
import java.sql.*;
import oracle.jdbc.driver.OracleDriver;

public class DBTest 
{
    public static void main (String[] args) 
    { 
        try { 
            Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
            DriverManager.registerDriver(new OracleDriver());        
            Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@nemesis:1721:dcap", "opus_client", "opus_clientdcap");
            Statement stmt = conn.createStatement(); 
            ResultSet rs; 
    
            rs = stmt.executeQuery("select 1 from dual where 1.1 = to_number('1.1')"); 
            while ( rs.next() ) { 
                System.out.println("Succes!"); 
            } 
            conn.close(); 
        } catch (Exception e) { 
            e.printStackTrace();
        } 
    } 
}

Is there a specific environment variable I must set in the JVM to make this work? Or is this due to the language that my OS uses?

Thanks in advance for your help!