This should not be a problem. Please do send a page link.
On Mon, Jun 10, 2013 at 8:12 AM, Jim White <jim.wh...@accelrys.com> wrote:
> Hi,
>
> I'm having problems when using more than one Jmol applet to display
> crystal structures on the same page (in the same process).
> Typically, one of the applets succeeds, while the others fail with the
> error
>
> "Unexpected end of file after line 72:
> null
> for file ...
> type Cif"
>
> This occurs, e.g. for a simple page containing only 2 applets, initialised
> on page load, each displaying the zeolite TON (I can send this example page
> if necessary).
> One of the 2 applets fails reliably in this case, whereas a single applet
> never fails.
> Also, 2 applets displaying molecules always succeeds.
>
> I've seen this problem in Jmol version 13.0.8.
> Version 12.0.15 didn't show this problem, at least not reliably enough to
> be noticed.
>
> Is this a bug, or is this scenario, with multiple Jmol applets running in
> the same process, explicitly not supported?
>
> I have been able to work around the problem by forcing each applet to run
> in a separate jvm using an applet parameter ( by adding javascript
> jmolSetParameter("separate_jvm", true); ) although I am concerned about the
> performance implications of this.
> Are there any better workarounds?
>
>
> >From what I have observed so far, it appears that the problem relates to
> simultaneously accessing the SpaceGroup objects in the static array
> SpaceGroup::spaceGroupDefinitions in multiple threads
> (org/jmol/symmetry/SpaceGroup.java). The lazy instantiation of the space
> group operators makes this particularly hazardous. In principle, accessing
> the static array SpaceGroup::canonicalSeitzList could also be a problem.
> In practice, I have found that declaring the SpaceGroup::findSpaceGroup
> method to be synchronized removes the problem, i.e.
> private static synchronized SpaceGroup findSpaceGroup(String s)
>
> although I wouldn't claim that this is sufficient to make the code
> thread-safe.
>
>
> Thanks in advance for any help,
> Jim
>
>
> Accelrys Limited (http://accelrys.com)
> Registered office: 334 Cambridge Science Park, Cambridge, CB4 0WN, UK
> Registered in England: 2326316
>
>
>
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--
Robert M. Hanson
Larson-Anderson Professor of Chemistry
St. Olaf College
Northfield, MN
http://www.stolaf.edu/people/hansonr
If nature does not answer first what we want,
it is better to take what answer we get.
-- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900
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