How to Solve the Missing sqljdbc_auth.dll Error in Java JDBC Connections?

DLL Missing in JDBC: Resolving the sqljdbc_auth.dll Issue

When working with SQL in Java, you may encounter an error related to the missing sqljdbc_auth.dll file, especially when using integratedSecurity in the connection string. This article provides a solution to this common issue.

The sqljdbc_auth.dll is a Windows dynamic link library (DLL) used for Windows Authentication in SQL Server JDBC drivers. To resolve the missing DLL error, you need to ensure that it is available in the correct system path.

Solution:

1. Download the sqljdbc Driver: Visit the official Microsoft JDBC Driver for SQL Server download page (https://docs.microsoft.com/en-us/sql/connect/jdbc/download) and download the latest version of the driver.
2. Extract the DLL: Unzip the downloaded file and locate the sqljdbc_auth.dll file.
3. Copy to System32 Folder: Place the extracted sqljdbc_auth.dll in the Windows System32 folder. The default location is typically C:WindowsSystem32.

Alternative Solution:

If placing the DLL in the System32 folder does not resolve the issue, try the following:

1. Add DLL to Build Path: Create a folder named "dll" in your project directory.
2. Copy DLL to Folder: Place the sqljdbc_auth.dll in the "dll" folder.
3. Update Classpath: In your Java build configuration, add the "dll" folder to the classpath.

After adding the DLL to the System32 folder or build path, restart your Java application. This should resolve the "sqljdbc_auth.dll missing" error when using integrated security in the JDBC connection string.

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