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IIOException: can't create cache file! [message #462]

Mon, 28 February 2005 08:40

tbolsh
Messages: 13
Registered: August 2004
Location: Fermilab, Batavia, IL

Member

Good morning!

Recently I wrote a little program to compute Integrated Luminosities over some period of time. It is a server side daemon, it reads datalogger data, creates AIDA file and generates a plot.
On my local machine it worked fine for a while, when I move to the server it stop producing plots. In the server logs I see an exception
javax.imageio.IIOException with line 'Can't create cache file!'

So, it is obvious that daemon miss some permissions somewehere.
Does somebody know WHERE it tries to create this cache file?
It seems that /tmp and target directory are available for that daemon ... How can I control where it creates that cache file?

Thanks,
Timofei Bolshakov

[Updated on: Mon, 28 February 2005 08:41]

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Re: IIOException: can't create cache file! [message #464 is a reply to message #462 ]

Mon, 28 February 2005 10:10

duns
Messages: 464
Registered: January 2004

Member

Hi

which type of image are you writing? PNG, GIF, ...?

Regards
Mark Donszelmann

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Re: IIOException: can't create cache file! [message #465 is a reply to message #464 ]

Mon, 28 February 2005 10:11

tbolsh
Messages: 13
Registered: August 2004
Location: Fermilab, Batavia, IL

Member

GIF.
I can show code, but it is pretty straitforward -
I create IPlotter and call writeToFile.

Timofei.

P.S. I tried PNG - same results ...

[Updated on: Mon, 28 February 2005 13:10]

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Re: IIOException: can't create cache file! [message #466 is a reply to message #465 ]

Mon, 28 February 2005 13:36

duns
Messages: 464
Registered: January 2004

Member

Could you try PNG. Just to see if it is different.

Regards
Mark

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Re: IIOException: can't create cache file! [message #467 is a reply to message #466 ]

Mon, 28 February 2005 14:06

tbolsh
Messages: 13
Registered: August 2004
Location: Fermilab, Batavia, IL

Member

I tried PNG - same results.

Timofei.

[Updated on: Mon, 28 February 2005 14:06]

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Re: IIOException: can't create cache file! [message #473 is a reply to message #462 ]

Mon, 28 February 2005 20:15

tonyj
Messages: 146
Registered: January 2004

Member

Looks like there is some discussion of this here:

http://forum.java.sun.com/thread.jspa?forumID=20&message ID=1195181&threadID=223792

Are you using tomcat? If so perhaps you need to set up a temp directory as discussed in the referenced discussion.

Tony

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Re: IIOException: can't create cache file! [message #475 is a reply to message #473 ]

Mon, 28 February 2005 20:43

duns
Messages: 464
Registered: January 2004

Member

Hi

ImageIO.java uses a cachedir which is normally pointed to
by:

java.io.tmpdir

A search for this property delivered:

The
* default temporary-file directory is specified by the system property
* <code>java.io.tmpdir</code>. On UNIX systems the default value of this
* property is typically <code>"/tmp"</code> or <code>"/var/tmp"</code>; on
* Microsoft Windows systems it is typically <code>"c:\\temp"</code>. A different
* value may be given to this system property when the Java virtual machine
* is invoked, but programmatic changes to this property are not guaranteed
* to have any effect upon the the temporary directory used by this method.

I guess one could set it on beforehand...

Regards
Mark

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Re: IIOException: can't create cache file! [message #478 is a reply to message #467 ]

Tue, 01 March 2005 06:33

tbolsh
Messages: 13
Registered: August 2004
Location: Fermilab, Batavia, IL

Member

Thank you very much for help!
Everything works now. Besides the temp directory I set the
home directory for the user 'nobody' - I do not know is it necessary or not.

So, this little snippet of code fixes the problem:


if( System.getProperty( "user.name" ).startsWith( "nobody" ) ) {
   System.setProperty( "user.home", "/some_directory_or_tmp" );
   System.setProperty( "java.io.tmpdir", "/tmp" );
}

Timofei Bolshakov.

[Updated on: Tue, 01 March 2005 06:48]

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