sql - Connect SYS DBA with no password using JAVA -

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I want to connect the Oracle DB with Java, I have the code: 

  class .forName ("oracle.jdbc.driver.OracleDriver"); dbURL = "jdbc: oracle: thin: @localhost: 1521: db"; con = DriverManager.getConnection (dbURL, "system as sysdba", ""); Return return;   
 This is not working, but I tried a command prompt such as this Con / sysdba, it can be connected. I'm goggling about this article but not all codes work.  
 Anyone can help.  
 Thanks   
 
 
 JDBC to log on as a SYSDBA with thin driver You must configure the server to use the password file. So you need to provide the password for sys.

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