无法使用流程标准输出（VB.NET）获取Java版本

Question

I need to get java version, so i need java process with parameter "-version"

it works on cmd, and not work on this code. and, it create java process well. but i can't get output.

What i need to solve this problem?

    Dim JavaProc As New Process()
    Dim JavaProcInfo As New ProcessStartInfo("java", "-version")

    With JavaProcInfo
        .UseShellExecute = False
        .RedirectStandardOutput = True
    End With

    With JavaProc
        .StartInfo = JavaProcInfo
        .Start()
    End With

    Dim sOutput As String
    Using sReader As System.IO.StreamReader = JavaProc.StandardOutput
        sOutput = sReader.ReadToEnd()
    End Using

    MsgBox(sOutput)

Answer 1

The version is sitting on the StandardError stream. Below is the modified code block; notice that the StandardError stream needs to be redirected.

Dim JavaProc As New Process()
Dim JavaProcInfo As New ProcessStartInfo("java", "-version")

With JavaProcInfo
    .UseShellExecute = False
    .RedirectStandardError = True
End With

With JavaProc
    .StartInfo = JavaProcInfo
    .Start()
End With

Dim sOutput As String
Using sReader As System.IO.StreamReader = JavaProc.StandardError
    sOutput = sReader.ReadToEnd()
End Using

MsgBox(sOutput)