Hello Eugen,
PlantUML has found Graphviz (the dot program) and then tries to create
the file testdottmp42.dot and encounters the permission issue.
It may be a java permission error. Just to test quickly, you can try
to disable the security manager of Tomcat.
I hope this helps
Maxime
2012/8/18 Eugen Colesnicov <ecolesnicov(a)gmail.com>om>:
  I am trying to configure PlantUML to work with local
Graphviz server.
 My environment - Linux Mint Debian (last stable), MySQL, Tomcat, XWiki
 4.1.3.
 XWiki installed from standart xwiki deb-packages. No any customization on OS
 or XWiki. Empty base (only installed standart wiki-pages).
 According to PlantUML macros installation guide, I installed Graphviz, and
 deleted path to external graphviz server. Also I added GRAPHVIZ_DOT to
 system variable (added export GRAPHVIZ_DOT="/usr/bin/dot" to /etc/profile).
 But when I opening test page
 
http://localhost:8080/xwiki/bin/view/XWiki/PlantUMLMacro
 I have got an error:
 Dot executable is /usr/bin/dot
 Dot version: dot - graphviz version ...
 java.io.FileNotDoundExeption: testdottmp42.dot (Permission denied)
 ...
 I checked - dot executable exists in /usr/bin/. Also I checked environment
 variables with comand env - all is ok, GRAPHVIZ_DOT variable exists and give
 correct path.
 Also, I tried to give full permissions for /usr/bin/ and dot executable -
 any user/group can read / write / execute it. Also I tried to change tomcat
 parameters: TOMCAT6_USER=root and TOMCAT6_GROUP=root for the starting tomcat
 as root (it is not good for security reason but for testing is ok).
 As a result - same situation, same error.
 What is the problem and how I is possible correct it?
 Thanks beforehand!
 Eugen Colesnicov
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