[zvtm-devel] launching zgrviewer from apache/php (drupal's visualize_backtrace module)

[David L. <mai...@da...>]

Hi All,

I'm trying to fully install and configure drupal's visualize_backtrace
module on my local computer, and I'm almost complete with it.  A part
of it deals with zgrviewer.

Here's the successful part: the module provides to me a command that I
can execute at the command-line, and those work.  It launches
zgrviewer and loads the expected file.  The commands are always like
this:

/usr/local/bin/zgrviewer/run.sh --Pdot
/Users/david/Sites/drupal-5.2_2/files/1195858966_section3.dot;

Now, the problem happens when php executes the very same command.  PHP
and apache are running under user: david and group: david.  The files
in /usr/local/bin/zgrviewer all belong to user: david and group:
david.

When PHP does this:

shell_exec('/usr/local/bin/zgrviewer/run.sh --Pdot
/Users/david/Sites/drupal-5.2_2/files/1195858966_section3.dot;');

the viewer is not launched, and the following errors are logged in the
apache error log:

Exception in thread "main" java.lang.UnsatisfiedLinkError:
/System/Library/Frameworks/JavaVM.framework/Versions/1.5.0/Libraries/libawt.jnilib:
	at java.lang.ClassLoader$NativeLibrary.load(Native Method)
	at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1822)
	at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1723)
	at java.lang.Runtime.loadLibrary0(Runtime.java:822)
	at java.lang.System.loadLibrary(System.java:993)
	at sun.security.action.LoadLibraryAction.run(LoadLibraryAction.java:50)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.awt.Toolkit.loadLibraries(Toolkit.java:1509)
	at java.awt.Toolkit.<clinit>(Toolkit.java:1530)
	at java.awt.Font.<clinit>(Font.java:141)
	at net.claribole.zgrviewer.Utils.<clinit>(Utils.java:39)
	at net.claribole.zgrviewer.ZGRViewer.main(ZGRViewer.java:463)

Does "$Native Library" need to be replaced with something else?  I'm
no java expert, so I'm not sure where to start in trying to figure out
how to make sure it gets set, if that's even really the issue.

I've also tried other PHP commands such as system(), exec(), and
combined with escapeshellcmd(), but the same result always happens -
errors in the apache log and no launch of zgrviewer.

So, a specific question:
Is there a system variable that I need to make sure is set in the
Apache/PHP environment, that may not be set, in comparison to my
regular shell environment?

A few other details:
Mac OS 10.5 Leopard

run.sh contains this:
ZGRV_HOME=/usr/local/bin/zgrviewer
java -cp $ZGRV_HOME/lib/zvtm.jar:$ZGRV_HOME/lib/zgrviewer.jar:$ZGRV_HOME/lib/xercesImpl.jar:$ZGRV_HOME/lib/xml-apis.jar:$ZGRV_HOME/lib/antlr-2.7.5.jar:$ZGRV_HOME/lib/statemachine.jar
net.claribole.zgrviewer.ZGRViewer "$@"

(pardon the long line)

I would appreciate any suggestions as to what I should look at.
Best Regards,
David Lanier