Problem with AstroImageJ and AstroCC with Java SE 7 Update 4 on Apple OSX

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Problem with AstroImageJ and AstroCC with Java SE 7 Update 4 on Apple OSX

karenacollins
Administrator
This post was updated on .
Apparently there is a networking problem with Oracle's Java SE 7 Update 4 for Apple / Mac OS X that prevents network access in Java applications. The problem causes AstroCC and AstroImageJ Coordinate Converter to show an error message indicating no network access when a networking function is activated. This problem causes SIMBAD name resolution, BJD time calculations from Ohio State's website, the SIMBAD link, and the SKY-MAP link to not function.

The recommended solution at this time is to not upgrade to Oracle's Java SE 7 Update 4 for Apple / Mac OS X. Hopefully the issue will be resolved by Oracle soon.

However, if you require the Java update for other reasons, use the work-around shown in the last line below. Unfortunately the work-around only corrects the network access problem when AstroCC is started from the command line of a terminal window. At this time, there is no work-around when opening AstroCC by double clicking the AstroCC.jar file or opening the program from the AstroCC website.

The problem description from Oracle:

-------------------------------------
Area: java/classes_nio
Synopsis: Selector.select hang due to poll(2) bug [macosx]

An issue with the Mac OS X poll(2) system call has been found to cause
problems for networking applications based on the java.nio socket channel
classes. This issue has been detected with the Oracle WebLogic Server on Mac
OS X.

A workaround to mitigate the problem is setting the following system
property on the Java command line:

-Djava.nio.channels.spi.SelectorProvider=sun.nio.ch.KQueueSelectorProvider
----------------------------

For the original report, see:
http://www.oracle.com/technetwork/java/javase/7u4-relnotes-1575007.html

Karen
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