Issue #6676 has been updated by Christopher Brooks.

% Done changed from 0 to 90

This is fixed.

ptolemy.actor.lib.Exec invokes java.lang.Runtime.exec(), which takes as its 
last argument the directory.  The Javadoc for Runtime.exec() state that if the 
directory is null, then the current directory of the parent process is used.

I fixed up Exec.java to handle the directory being the empty string, which 
means that a null gets passed to Runtime.exec().

I updated the documentation for the class and changed 
ptolemy/actor/lib/test/auto/Exec.xml so that the directory parameter is the 
empty string, which tickles this bug.

This bug may be closed after someone else confirms that it is fixed.

----------------------------------------
Bug #6676: External Execution actors generates exception for empty directory
https://projects.ecoinformatics.org/ecoinfo/issues/6676#change-21956

* Author: Daniel Crawl
* Status: New
* Priority: Low
* Assignee: Daniel Crawl
* Category: actors
* Target version: 2.5.0
* Bugzilla-Id: 
----------------------------------------
If the directory parameter is empty for the External Execution actor, a 
NullPointerException is generated:

java.lang.NullPointerException
    at ptolemy.actor.lib.Exec._exec(Exec.java:516)
    at ptolemy.actor.lib.Exec.fire(Exec.java:337)
    at ptolemy.actor.AtomicActor.iterate(AtomicActor.java:496)

It would be better to default to user.dir or throw an exception saying 
directory must be specified.


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