使用VB.NET启动Java服务器会引发错误

Question

我在询问用户文件的位置后，尝试使用VB.NET启动.jar文件。一切似乎都有效，但当我确认文件对话框时，我得到一个错误，基本上说无法找到该文件。这是我的代码：

Class MainWindow
Dim ServerDir As String

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles Button1.Click

    Dim fd As OpenFileDialog = New OpenFileDialog()
    fd.Title = "Select Server JAR"
    fd.InitialDirectory = My.Computer.FileSystem.SpecialDirectories.Desktop
    fd.Filter = "All files (*.*)|*.*|All files (*.*)|*.*"
    fd.FilterIndex = 0

    If fd.ShowDialog = Windows.Forms.DialogResult.OK Then
        ServerDir = fd.FileName
    End If

    Call LaunchServer()

End Sub

Private Sub LaunchServer()
    Try
        Process.Start("java -Xmx1024M -Xms1024M -jar" & ServerDir)
    Catch ex As Exception
        MsgBox(ex.Message)
    End Try
End Sub
End Class

有什么建议吗？