Re: Problem with ConnectionPool on Linux

[Kwok Peng Tuck]

The new version of DBCP should be able to cope with this as well.
I tested it with MaxDB and it works ok.
Veselin Kovacevic wrote:

Now, everything working fine. :)

Thanks Jon.



-----Original Message-----
From: Jon Wingfield [mailto:[EMAIL PROTECTED] 
Sent: Tuesday, November 11, 2003 4:50 PM
To: Tomcat Users List
Subject: Re: Problem with ConnectionPool on Linux

MySql times out idle connections. If your pool implementation doesn't 
take care of weeding out dead connections you need to add 
autoReconnect=true to your connection string.

HTH,

Jon

Veselin Kovacevic wrote:

 

Hi,

I have o problem with Tomcat 4.1.24 on SuseLinux7.3. Our application 
has Controller servlet (below) where using connection objects from 
connection pool. When tomcat started, application working fine and 
everything OK that day. But next day when we try to start application 
we get error message in isUser method (PortalUserDB class). It's first
   

 

place where we use connection object in application. Method isUser is 
very simple method for authenticate user (below). We get this 
exception: SQL Exception:java.sql.SQLException: No operations allowed 
after connection closed

Connection object is not null in this case, and this message for me is
   

 

not correct. Next, if I restart tomcat, everything working ok... (for 
next day).

On windows (we using windows for development platform) we have not 
this problem.

What is problem?
Is configuration server.xml or similar configuration files on Linux
different rather on windows?
Note:
On both platform we using Tomcat 4.1.24 and j2sdk1.4.1_03.
public class Controller extends HttpServlet {	

	private DataSource ds;
	
	public void init(ServletConfig config) throws ServletException {
		super.init(config);
		try {
			InitialContext initCtx = new InitialContext();
			Context envCtx =
(Context)initCtx.lookup("java:comp/env"); 
			ds =
(DataSource)envCtx.lookup("jdbc/MySQLPool");
		} catch (Exception e){
			throw new UnavailableException(e.getMessage());
		}
	}
	
	public void doGet(HttpServletRequest request,
   

HttpServletResponse 
 

response)
                                          throws IOException,
ServletException {
                
                request.setCharacterEncoding("iso-8859-2");
                
                ........................
                ........................
                if (ds != null) {
                Connection conn = ds.getConnection();
                        if (conn != null) {
                                boolean isUserExists =
PortalUserDB.isUser(conn, userName, userPass);
                                        ........................
                                        ........................        
                                conn.close();
                        }
                ........................
                ........................
        }
}
public static boolean isUser(Connection conn, String userName, String
userPass)
        throws SQLException, IOException {
        String query = "SELECT user_name FROM admin_user " +
                                   "WHERE user_name = ? " +
                                                "AND user_pass = ?";
                                                
        boolean isUserExists = false;
                
        try {
                PreparedStatement pstmt = conn.prepareStatement(query);
                pstmt.setString(1, userName);
                pstmt.setString(2, userPass);
                
                ResultSet rs = pstmt.executeQuery();
        
                isUserExists = rs.next();
        
                rs.close();
                rs = null;
                pstmt.close();
                pstmt = null;
                
        } catch (SQLException sqle) {
                PortalLog.addLogLine("Class: PortalUserDB, Method:
isUser. SQL Exception:" + sqle, userName);
        }
        
        return isUserExists;
}
Thanks,
Veso
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