Reading custom data sources error Messages

Please insert code blocks using the code block option in the toolbar.

You should be setting the return code in a variable in your try/catch/finally block and returning that error code. Then you can just have a datapoint that looks at the return code. That also solves the problem of your current code not having a return code, which will cause LM to ignore the output.

return_code = 0
try {
    sql.getConnection()
} catch (SQLException e) {
    if (e.getMessage().contains("Login failed")) {
        return_code = 1 // Invalid password or login failed
    } else {
        return_code = 2 // Other connection or server error, including server offline
    }
} finally {
    sql.close()
    return return_code
}