问题
I have been trying to set up a DatabaseConnectionPool for a web app for the last couple of days with no success. I have read the relevant sections of the Tomcat docs and a great deal around the subject and think I'm doing everything right, but obviously not because I keep on getting the following error:
Cannot create PoolableConnectionFactory (Access denied for user ''@'localhost' (using password: YES))
I'm not getting the error when I start Tomcat running, but when I try to run the following servlet:
package twittersearch.web;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import java.sql.*;
import javax.sql.*;
import javax.naming.*;
import twittersearch.model.*;
public class ConPoolTest extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException {
Context ctx = null;
DataSource ds = null;
Connection conn = null;
try {
ctx = new InitialContext();
ds = (DataSource)ctx.lookup("java:comp/env/jdbc/twittersearchdb");
conn = ds.getConnection();
if(conn != null) {
System.out.println("have a connection from the pool");
}
} catch(SQLException e) {
e.printStackTrace();
} catch(NamingException e) {
e.printStackTrace();
} finally {
try {
if(conn!=null) {
conn.close();
}
} catch(SQLException e) {
e.printStackTrace();
}
}
}
}
The context for the webapp is:
<?xml version='1.0' encoding='utf-8'?>
<Context>
<!-- Configure a JDBC DataSource for the user database -->
<Resource name="jdbc/twittersearchdb"
type="javax.sql.DataSource"
auth="Container"
user="root"
password="mypwd"
driverClassName="com.mysql.jdbc.Driver"
url="jdbc:mysql://localhost:3306/twitter"
maxActive="8"
maxIdle="4"/>
</Context>
What I really don't understand is why the error isn't saying that the access is denied to 'root'@'localhost' when I've specified that that's the user.
What I've tried:
Do I have a duplicate context.xml? No. I deleted the default on in Tomcat 6.0/conf. I tried putting a context.xml in [mywebappname]/META-INF/context.xml but not only did this not work, but resulted in the creation of a file named TwitterSearch.xml which was autogenerated and put in the Tomcat 6.0/conf/Catalina/localhost directory. So now I'm just editing that one and thats the only one I have.
Is it the version of Tomcat? Well, I completely reinstalled the latest version of Tomcat 6.0 so I don't think it's that.
Are we missing some jars? I have the tomcat-dbcp.jar, jconnector.jar and all the other ones that I think I'm meant to have in the Tomcat 6.0/lib directory.
When I look at the passwords in the MySQL database they seem to have been coded for security purposes into a long alpha-numeric string. Is this normal? Should I have this in my context.xml or just the normal password?
I really don't know how I can sort this out and would really appreciate some expert advice.
Many thanks in advance.
Joe
回答1:
Your setup looks fine. This looks to purly be a permissions problem.
You need to grant that user access in mysql. While Java will connect to localhost, it will do so using tcp/ip - however in mysql localhost and 127.0.0.1 have different meaning. Issuing this SQL should do the trick.
grant all on twitter.* to 'root'@'127.0.0.1' identified by 'mypwd';
That assumes Java resolves 'localhost' to 127.0.0.1, if things still doesn't work, you could try changing your connection string to "jdbc:mysql://127.0.0.1:3306/twitter"
Should I have this in my context.xml or just the normal password?
As you have it now, the plaintext password.
回答2:
In your configuration context.xml for the webapp you have to change user="root" by username="root"
来源:https://stackoverflow.com/questions/3782197/cannot-create-poolableconnectionfactory-access-denied-for-user-localhost