Loading dll file inside eclipse java project

Question

I am trying to add the file sqljdbc_auth.dll to the project library. I add the folder containing the dll as external class folder.

Here I am basically trying to connect to my SQL SERVER 2008 database using SQL drivers given by Microsoft.

My code is

private static void Connect(){
        try
        {
            Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
            String connectionUrl = "jdbc:hostname:1433;databaseName=dbname;"

                + "user=username;password=password";
            java.sql.Connection con = DriverManager.getConnection(connectionUrl);
        }
        catch(ClassNotFoundException e)
        {
            e.printStackTrace();
        }
        catch(SQLException e2)
        {
            e2.printStackTrace();
        }
    }`

I get the following error

WARNING: Failed to load the sqljdbc_auth.dll cause : no sqljdbc_auth in java.library.path
com.microsoft.sqlserver.jdbc.SQLServerException: This driver is not configured for integrated authentication. ClientConnectionId:b83147c7-b45a-4f35-b601-195a0aa9c32c
    at com.microsoft.sqlserver.jdbc.SQLServerConnection.terminate(SQLServerConnection.java:1667)
    at com.microsoft.sqlserver.jdbc.AuthenticationJNI.<init>(AuthenticationJNI.java:60)
    at com.microsoft.sqlserver.jdbc.SQLServerConnection.logon(SQLServerConnection.java:2229)
    at com.microsoft.sqlserver.jdbc.SQLServerConnection.access$000(SQLServerConnection.java:41)
    at com.microsoft.sqlserver.jdbc.SQLServerConnection$LogonCommand.doExecute(SQLServerConnection.java:2220)
    at com.microsoft.sqlserver.jdbc.TDSCommand.execute(IOBuffer.java:5696)
    at com.microsoft.sqlserver.jdbc.SQLServerConnection.executeCommand(SQLServerConnection.java:1715)
    at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectHelper(SQLServerConnection.java:1326)
    at com.microsoft.sqlserver.jdbc.SQLServerConnection.login(SQLServerConnection.java:991)
    at com.microsoft.sqlserver.jdbc.SQLServerConnection.connect(SQLServerConnection.java:827)
    at com.microsoft.sqlserver.jdbc.SQLServerDriver.connect(SQLServerDriver.java:1012)
    at java.sql.DriverManager.getConnection(Unknown Source)
    at java.sql.DriverManager.getConnection(Unknown Source)
    at com.sagar.com.package1.T1.Connect(T1.java:21)
    at com.sagar.com.package1.T1.main(T1.java:37)
Caused by: java.lang.UnsatisfiedLinkError: no sqljdbc_auth in java.library.path
    at java.lang.ClassLoader.loadLibrary(Unknown Source)
    at java.lang.Runtime.loadLibrary0(Unknown Source)
    at java.lang.System.loadLibrary(Unknown Source)
    at com.microsoft.sqlserver.jdbc.AuthenticationJNI.<clinit>(AuthenticationJNI.java:35)
    ... 13 more

Answer 1

Another option is to add something like this to the VM parameters of the project's main class:

-Djava.library.path="C:\Program Files\Microsoft JDBC Driver 4.0 for SQL Server\sqljdbc_4.0\enu\auth\x64"

(specifying the path to the sqljdbc_auth.dll file). There's no need to change the environment PATH or Eclipse IDE jvm parameters.

For the project's main class, select menu option Run As >> Run Configurations...

Answer 2

If you want to use a DLL from inside Eclipse, you either need to include the DLL in a location on the system PATH, or you need to explicitly specify the java.library.path property in the run configuration of Eclipse.