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From André Warnier ...@ice-sa.com>
Subject Re: runtime.exec "cmd.exe /C net use"
Date Wed, 10 Apr 2013 19:07:49 GMT
David kerber wrote:
> On 4/10/2013 2:47 PM, Bilal S wrote:
>> On Sun, Mar 24, 2013 at 10:20 AM, Patrick Flaherty
>> <pflahrty@rampageinc.com>wrote:
>>
>>>
>>> On Mar 23, 2013, at 10:00 PM, David Kerber wrote:
>>>
>>>   On 3/23/2013 8:13 PM, Harris, Jeffrey E. wrote:
>>>>
>>>>>
>>>>>
>>>>>   -----Original Message-----
>>>>>> From: André Warnier [mailto:aw@ice-sa.com]
>>>>>> Sent: Saturday, March 23, 2013 8:10 PM
>>>>>> To: Tomcat Users List
>>>>>> Subject: Re: runtime.exec "cmd.exe /C net use"
>>>>>>
>>>>>> Harris, Jeffrey E. wrote:
>>>>>>
>>>>>>>
>>>>>>>   -----Original Message-----
>>>>>>>> From: Patrick Flaherty 
>>>>>>>> [mailto:pflahrty@rampageinc.**com<pflahrty@rampageinc.com>
>>>>>>>> ]
>>>>>>>> Sent: Saturday, March 23, 2013 5:22 PM
>>>>>>>> To: Tomcat Users List
>>>>>>>> Subject: runtime.exec "cmd.exe /C net use"
>>>>>>>>
>>>>>>>> Hi,
>>>>>>>>
>>>>>>>> I'm trying to run the following command ( runtime.exec "cmd.exe
/C
>>>>>>>> net use" ) from my tomcat app and it's returning :
>>>>>>>>
>>>>>>>> net use
>>>>>>>> New connections will be remembered.
>>>>>>>>
>>>>>>>> There are no entries in the list.
>>>>>>>>
>>>>>>>> This only happen when I run as a Windows service. If I run
the
>>>>>>>>
>>>>>>> tomcat
>>>>>>
>>>>>>> batch file to start tomcat then "net use" returns all my mapped
>>>>>>>> network drives. The service login is an account that has
access to
>>>>>>>> the network shares as my app uses those shares, but the service
>>>>>>>>
>>>>>>> login
>>>>>>
>>>>>>> should not preclude the command from executing properly. If I
>>>>>>>> substitute "dir" for "net use"
>>>>>>>> that works and I get a directory listing. The combo of "net
use"
>>>>>>>> command using cmd.exe and running as a service seems to be
the
>>>>>>>> conflict.
>>>>>>>>
>>>>>>>> Any input much appreciated.
>>>>>>>>
>>>>>>>> Thanks
>>>>>>>> Pat
>>>>>>>>
>>>>>>>
>>>>>> I would add that it is kind of doubtful that this has anything 
>>>>>> directly
>>>>>> to do with Tomcat, or even Java.  Maybe that question would belong

>>>>>> more
>>>>>> to some Windows forum.
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> ------------------------------**------------------------------**
>>>>>> ---------
>>>>>>
>>>>>
>>>>> I absolutely agree.  I would expect to see the same behavior with 
>>>>> Apache
>>>>> HTTPD, IIS, or
>>>>> any other service that accesses mapped drives.  It is a question of 
>>>>> how
>>>>> service accounts behave
>>>>> in the windows architecture, rather than something specific with 
>>>>> Tomcat.
>>>>>
>>>>> Jeffrey Harris
>>>>>
>>>>
>>>> It will depend on what user your TC service is running under.    If 
>>>> it's
>>>> running as the LocalSystem user,  it will not have access to any 
>>>> network
>>>> drives, or many other network resources.  It can hit some, such as
>>>> databases.
>>>>
>>>> If you want your TC to be able to see networked drives, you need to run
>>>> it under the logged-on user's ID.  Keep in mind, though, that if the 
>>>> user
>>>> logs off, the drives will be disconnected.  Your best bet in that 
>>>> case it
>>>> to not connect by drive letter, but rather by the UNC name (what you 
>>>> used
>>>> to map it when you were logged on).  That will work if the user TC is
>>>> running has has the appropriate permissions to the network resource.
>>>>
>>>> D
>>>>
>>>
>>> Hi,
>>>
>>> Thanks for all the input. I know about service logins being only able to
>>> use UNC paths (not drive letters) to access network shares. I know the
>>> service login&  password have to
>>> have a matching account on the server with the shares in order for the
>>> tomcat app to use (access) those shares. We do all of this. Out 
>>> tomcat app
>>> depends on
>>> network shares to function and it always has worked as long as the 
>>> service
>>> login account matches an account on the server with the shares.
>>>
>>> What I'm trying to do in an html interface is make a pulldown menu 
>>> list of
>>> my mapped drives as a location for our database backup. It's a 
>>> preference
>>> setup to
>>> where an automated scheduled backup will write the backups. I'm using 
>>> "net
>>> use" to produce what you would expect for output (all the mapped network
>>> drives)
>>> and parsing the output to produce the pulldown menu item containing the
>>> unc portion gleaned from the "net use" output. I need the unc portion as
>>> this is what
>>> a tomcat app needs. No matter what I do outside the app I cannot produce
>>> the effectively empty list that the app is producing. I'm logged into
>>> Windows as the same
>>> account as the service and I open a command prompt and see all my mapped
>>> drives via "net use". I have tried UAC on and off and it changes 
>>> nothing. I
>>> added a simple
>>> "dir" to the app and I can get that output but not the "net use" 
>>> output. I
>>> do know it has to do with the service as I said because when tomcat is
>>> started via the startup.bat
>>> it works great.
>>>
>>> Maybe it is a Windows question but thought someone may have had some
>>> similar experience.
>>>
>>> Thanks for eveyone's thoughts.
>>>
>>> -Pat
>>>
>>>
>>>
>>>
>> Pat,
>> I believe the Windows workstation service is required to map drives.
>> Background services in general run under a different context, thus, they
>> cannot map drives.
>> That being said you should be able to achieve this by allowing your 
>> Tomcat
>> service to "interact with desktop" then actually mapping your drives in
>> scripted fashion using a series of
>> net use F: \\target\one /PERSISTENT:YES
>> net use G: \\target\two /PERSISTENT:YES
>>
>> Now when you do a list using "net use" it should list drives for your
>> service.
>>
>> HTH
>> -Bilal
> 
> The last version of windows server that allowed "interact with desktop" 
> to work was Server 2003.  2008 and 2008R2 don't allow it any more.  And 
> if you log off, your drives will still be disconnected.
> 
+1

If you really need to access Windows network resources from within a webapp running in 
Tomcat, you should probably have a look at the JCIFS suite, @ jcifs.samba.org.

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