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how to authentice postgres user from java client

nexchanger
nexchanger asked
on
Medium Priority
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Last Modified: 2008-02-01
Hi experts,

I am trying to authenticate a user with postgres. I have created a postgres user and when I use the method below, it seems to work fine for a database installation on windows - i.e it returns a null Connection object when the authentication fails, however for a postgres installation on unix, it returns a non null Connection object even when the authentication fails. I am relying on this method to authenticate a user based on if the connection object is null or not.

Am I missing some thing trivial here. I cant understand why its behaving differently in the above cases. Any suggestions regarding this or any alternate ways of authenticating a postgres user would be appreciated.

public static Connection getConnection(String JNDIName, String username, String password) throws FrameworkException {

    Connection conn = null;
    try {
      DataSource ds = ServiceLocator.getInstance().getDatasource(JNDIName, true);

      if (username == null || (username != null && "".equals(username))) {
        //Retrieve the connection with the DS configured user/passowrd
        conn = ds.getConnection();
      }
      else {
        conn = ds.getConnection(username, password);
      }
    }
    catch (SQLException se) {
      throw new FrameworkException("Error retrieving connection for: " + JNDIName, se);
    }
    catch (ServiceLocatorException sle) {
      throw new FrameworkException("Could not retrieve a datasource for " + JNDIName, sle);
    }
    return conn;
  }
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Commented:
edit $PGDATA/pg_hba.conf  to turn on password authentication for your database.  Restart database.  
psql> alter user username password 'password';

Your app should raise an exception when the incorrect password is specified

FATAL:  password authentication failed for user "earthman2"
Exception!
org.postgresql.util.PSQLException: FATAL: password authentication failed for user "earthman2"

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Commented:
Actually its a little late for my purposes, as I now changed my code to fetch it from the pg_roles/pg_shadow and do all the logic myself.
Nonetheless thanks for your help!
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