Preview openoffice document doesn't work on tomcat

Hello,

Preview openoffice document doesn't work on tomcat server (apache-tomcat-8.5.11 and jdk1.8.0_121),
On same server, I tested with jetty package (working well) and tomcat.(failed)
The preview page doesn't displayed jpg file Pres-slidexx.jpg (generated by LibreOffice server) because a 503 error.

After many tests I launched a strace on:

• tomcat server: (the webapps: /home/applis/xwiki)
  http://localhost:8080/tmp/officeviewer/document%3Axwiki%3ABacASable.WebHome/0/Pres-slide0.jpg

  30970 lstat("/home/applis/xwiki", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
  30970 stat("/home/applis/xwiki/tmp/officeviewer/document:xwiki:BacASable.WebHome/0/Pres-slide0.jpg", 0x7fab477a89f0) = -1 ENOENT (No such file or directory)
  30970 write(76, "HTTP/1.1 403 \r\nAccess-Control-Al"..., 1266) = 1266
  

• and jetty: (the webapps: /home/xxxx/xwiki-enterprise-jetty-hsqldb-8.4.4/webapps/xwiki)
  http://localhost:8080/xwiki/tmp/officeviewer/document%3Axwiki%3ASandbox.test1.WebHome/0/Pres-slide1.jpg

  3911  stat("/home/xxxx/xwiki/tmp/jetty-0.0.0.0-8080-xwiki-_xwiki-any-5432034322773776123.dir/xwiki-temp/tmp/officeviewer/xwiki/Sandbox/test1/WebHome/0", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
  3911  open("/home/xxxx/xwiki/tmp/jetty-0.0.0.0-8080-xwiki-_xwiki-any-5432034322773776123.dir/xwiki-temp/tmp/officeviewer/xwiki/Sandbox/test1/WebHome/0/Pres-slide1.jpg", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 635
  3911  fstat(635, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
  3911  write(635, "\377\330\377\340\0\20JFIF\0\1\1\0\0\1\0\1\0\0\377\333\0C\0\10\6\6\7\6\5\10"..., 4096) = 4096
  

On tomcat server it seem the path of jpg is wrong:
<webapps>/xwiki/tmp/officeviewer/document/ .....jpg

Note, on Tomcat the correct path (where jpg are created) is:
<workdir_tomcat>/ROOT/xwiki-temp/tmp/officeviewer/xwiki/BacASable/WebHome/0/Pres-slide0.jpg

Thxs

Pascal B