SQL Server log in failing from Java DriverManager.getConnection(), working from Python with pymssql.connect()

问题

I'm trying to use DriverManager.getConnection() to connect to a SQL Server db from a Java application, but I keep getting "Login failed for user" errors with it. I've tried using both com.microsoft.sqlserver.jdbc.SQLServerDriver and net.sourceforge.jtds.jdbc.Driver to connect, but both keep hitting the issue.

Here's the code I'm using to connect:

Class.forName("net.sourceforge.jtds.jdbc.Driver");  
conn=DriverManager.getConnection("jdbc:jtds:sqlserver://SERVERADDRESS:1433;DatabaseName=DBNAME;user=USER;password=PASS");

I know that account has access to that DB, as I've connected to it before from a Python application using pymssql.connect(SERVERADDRESS, USER, PASS, DBNAME) with the same server/DB/creds.

From this article, I eventually managed to get it working using windows authentication with my personal account, but I still can't get it to work using our service account. Does anyone have any insight into why the Python app can connect but the Java one can't?

回答1:

pymssql is built on top of FreeTDS. Both FreeTDS and jTDS support an older Windows authentication scheme named NTLM, while current versions of Microsoft's JDBC Driver for SQL Server (mssql-jdbc) no longer support that authentication mechanism.

So, given that you've confirmed that pymssql can connect, you should be able to connect from your Java app as Windows user MYDOMAIN\username using jTDS like so:

String myUid = "username", myPwd = "mypassword";
String connUrl = "jdbc:jtds:sqlserver://192.168.1.123:1433/databasename;DOMAIN=MYDOMAIN";
Connection conn = DriverManager.getConnection(connUrl, myUid, myPwd);