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netca java.lang.nullpointerexception [message #539285]

Fri, 13 January 2012 00:48

subani123
Messages: 11
Registered: January 2012
Location: pune

Junior Member

Hi Everyone,

I am trying to open netca in redhat linux from command line

$netca..

java.lang exeception error occured..

I googled it ,found it like xclock must work before netca to work,

i set DISPLAY Env variable as:export DISPLAY=linux:0.0

$xclock....gives me the error
Can't Open Display for linux:0.0

How to get rid of this error..?
Please help

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Re: netca java.lang.nullpointerexception [message #539290 is a reply to message #539285]

Fri, 13 January 2012 01:25

Michel Cadot
Messages: 68762
Registered: March 2007
Location: Saint-Maur, France, https...

Senior Member
Account Moderator

Are you sure the DISPLAY value is correct?
Use the "xhost" command to allow the X display on your PC from your database server.

Regards
Michel

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Re: netca java.lang.nullpointerexception [message #539291 is a reply to message #539290]

Fri, 13 January 2012 01:31

subani123
Messages: 11
Registered: January 2012
Location: pune

Junior Member

My Hostname is:linux
From root user i did:$xhost +linux
linux have been added to access list
$export DISPLAY=linux:0.0
$echo $DISPLAY
linux:0.0
$xclock

Cant Open Display for linux:0.0 error

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Re: netca java.lang.nullpointerexception [message #539292 is a reply to message #539291]

Fri, 13 January 2012 01:35

subani123
Messages: 11
Registered: January 2012
Location: pune

Junior Member

sorry for my mistake,
after xhost ,i login as oracle user and repeat the stepa mentined above

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Re: netca java.lang.nullpointerexception [message #539295 is a reply to message #539292]

Fri, 13 January 2012 01:59

Michel Cadot
Messages: 68762
Registered: March 2007
Location: Saint-Maur, France, https...

Senior Member
Account Moderator

So the issue is solved?
If not, answer:
Quote:

Are you sure the DISPLAY value is correct?

Is your PC name "linux"?
Does your /etc/hosts contains this alias for your PC?

Regards
Michel

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Re: netca java.lang.nullpointerexception [message #539303 is a reply to message #539295]

Fri, 13 January 2012 03:56

subani123
Messages: 11
Registered: January 2012
Location: pune

Junior Member

Hi Michel,
Issue is not solved ,my hostname id linux and I made an entry already in /etc/hosts file as
192.168.1.7 linux linux

It looks everything is fine but unable to open the GUI window t oconfigure netca.

please help..?

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Re: netca java.lang.nullpointerexception [message #539307 is a reply to message #539303]

Fri, 13 January 2012 04:07

Michel Cadot
Messages: 68762
Registered: March 2007
Location: Saint-Maur, France, https...

Senior Member
Account Moderator

You should post this in a Linux forum, you will have a better chance to get an answer.
Once xclock will work, if you still have a problem then you can come back here.

Regards
Michel

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