Hello Thomas,
The answer :
root@CESAP-WIKI01:/var/log/tomcat7# ps aux | grep tomcat
tomcat7 6355 7.3 6.7 2182572 275136 ? Sl 12:34 0:59
/usr/lib/jvm/java-8-oracle/bin/java
-Djava.util.logging.config.file=/var/lib/tomcat7/conf/logging.properties
-Djava.awt.headless=true -Xmx512m -XX:+UseConcMarkSweepGC
-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
-Djava.endorsed.dirs=/usr/share/tomcat7/endorsed -classpath
/usr/share/tomcat7/bin/bootstrap.jar:/usr/share/tomcat7/bin/tomcat-juli.jar
-Dcatalina.base=/var/lib/tomcat7 -Dcatalina.home=/usr/share/tomcat7
-Djava.io.tmpdir=/tmp/tomcat7-tomcat7-tmp
org.apache.catalina.startup.Bootstrap start
thanks for the help
Cordialement
Stéphane Lassire
-----Message d'origine-----
De : users [mailto:users-bounces@xwiki.org] De la part de Thomas Mortagne
Envoyé : mercredi 25 mai 2016 12:46
À : XWiki Users
Objet : Re: [xwiki-users] Error upgrading Debian
"Invalid byte tag in constant pool: 15" still looks like a Java version
issue.
Could you check what version of Java started with "ps aux | grep tomcat" ?