Update:
Tried to change the memory settings at “/etc/default/tomcat9”:
New: JAVA_OPTS="-Djava.awt.headless=true -XX:+UseG1GC -Xms1024m -Xmx2048m"
Restarted Tomcat afterwards:
-> Tomcat seems to ignore this parameters.
-> “ChartMacro” problem still exist
You can check that using something like
ps aux | grep java
where you will see if what you added is in the command line used to start Tomcat.
Hi Thomas,
thanks for your reply.
Yes, i mentioned that command in my previous post from yesterday.
I’ve also checked the “catalina.log” where i can’t find the “Xms” or “Xmx” parameters.
> ps aux | grep grep Djava
/usr/lib/jvm/java-8-openjdk-amd64/bin/java
-Djava.util.logging.config.file=/var/lib/tomcat9/conf/logging.properties
-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
-Djava.security.egd=file:/dev/./urandom
-Djdk.tls.ephemeralDHKeySize=2048
-Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027
-Dignore.endorsed.dirs= -classpath /usr/share/tomcat9/bin/bootstrap.jar:/usr/share/tomcat9/bin/tomcat-juli.jar
-Dcatalina.base=/var/lib/tomcat9
-Dcatalina.home=/usr/share/tomcat9
-Djava.io.tmpdir=/tmp org.apache.catalina.startup.Bootstrap start
and
> ps aux | grep java
/usr/lib/jvm/java-8-openjdk-amd64/bin/java
-Djava.util.logging.config.file=/var/lib/tomcat9/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
-Djava.security.egd=file:/dev/./urandom
-Djdk.tls.ephemeralDHKeySize=2048
-Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027
-Dignore.endorsed.dirs= -classpath /usr/share/tomcat9/bin/bootstrap.jar:/usr/share/tomcat9/bin/tomcat-juli.jar
-Dcatalina.base=/var/lib/tomcat9
-Dcatalina.home=/usr/share/tomcat9
-Djava.io.tmpdir=/tmp org.apache.catalina.startup.Bootstrap start
So it seems that the “JAVA_OPTS” parameter for “-Djava.security.egd=file:/dev/./urandom” is not ignored from “/etc/default/tomcat9” but the parameter for the memory settings.
Best regards,
Dolo
You are not setting JAVA_OPTS several times, are you ?
Hi,
i do 
Sorry, i am new to Java Servlets and Tomcat etc. 
Should i place each parameter just into one “JAVA_OPTS” ?
Best regards,
Dolo
/etc/default/tomcat9 is actually a a bash script so when you set a variable it overwrite any content it previously had. You need to make sure you keep the previous content when you want to add more as in:
MYVAR="$MYVAR other stuff"
Or simply put everything in the same line.
Hi,
thank you for this usefull instruction.
I’ve placed everything inside same line of JAVA_OPTS inside /etc/default/tomcat9.
Now tomcat starts with correct parameters:
/usr/lib/jvm/java-8-openjdk-amd64/bin/java
-Djava.util.logging.config.file=/var/lib/tomcat9/conf/logging.properties
-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
-Djava.awt.headless=true -XX:+UseG1GC -Xms1024m -Xmx2048m
-Djava.security.egd=file:/dev/./urandom
-Djdk.tls.ephemeralDHKeySize=2048
-Djava.protocol.handler.pkgs=org.apache.catalina.webresources
-Dorg.apache.catalina.security.SecurityListener.UMASK=0027
-Dignore.endorsed.dirs= -classpath /usr/share/tomcat9/bin/bootstrap.jar:/usr/share/tomcat9/bin/tomcat-juli.jar
-Dcatalina.base=/var/lib/tomcat9 -Dcatalina.home=/usr/share/tomcat9
-Djava.io.tmpdir=/tmp org.apache.catalina.startup.Bootstrap start
Unfortunately this, dosn’t solve the actual “chartmacro” problem.
Will need to look for another possibilities.
Best regards,
Dolo
EDIT: grammar
Hi Vincent, Hi Thomas,
at first thank both of you for your constructive support and help!
I could solve the problem with the solution from Vincent.
I’ve installed XWiki in a test environment (VM - Ubunt 18.04)
(As Ubuntu “.deb” package from repo: apt install xwiki-tomcat9-pgsql)
Configured the XWiki
Tested out the Chart macro -> Does not work with an clean install
Used Vincent’s solution from https://github.com/microsoft/vscode-arduino/issues/644
Go to /etc/java-8-openjdk/accessibility.properties and comment out (deactivate) "assistive_technologies=org.GNOME.Accessibility.AtkWrapper"
Restart tomcat
Voilá - ChartMacro works
So maybe this solution can be somehow applied to the “.deb” package?
Thanks again!
Best regards,
Dolo
Installation of XWiki on an Ubuntu 18.04 VM
wget -q “https://maven.xwiki.org/public.gpg” -O- | sudo apt-key add -
sudo wget “https://maven.xwiki.org/stable/xwiki-stable.list” -P /etc/apt/sources.list.d/
sudo apt update
apt-cache search xwiki
sudo apt install xwiki-tomcat9-pgsql
Configuration
sudo nano /etc/xwiki/xwiki.cfg
=> Added/Replaced values for:
xwiki.authentication.validationKey=…
xwiki.authentication.encryptionKey=…
sudo nano /etc/default/tomcat9
Add/change:
JAVA_OPTS="-Djava.awt.headless=true -XX:+UseG1GC -Xms1024m -Xmx1024m -Djava.security.egd=file:/dev/./urandom"
configured “ShortURLs” - https://www.xwiki.org/xwiki/bin/view/Documentation/AdminGuide/ShortURLs/
sudo cp /etc/tomcat9/Catalina/localhost/xwiki.xml /etc/tomcat9/Catalina/localhost/xwiki.xml.original
sudo mv /etc/tomcat9/Catalina/localhost/xwiki.xml /etc/tomcat9/Catalina/localhost/ROOT.xml
sudo nano /etc/xwiki/xwiki-tomcat9.xml
OLD: <Context path="/xwiki" docBase="/usr/lib/xwiki" ...>
NEW: <Context path="/" docBase="/usr/lib/xwiki" ...>
sudo nano /etc/xwiki/xwiki.cfg
-> uncomment/activate: "xwiki.webapppath="
sudo systemctl restart tomcat9
Logged in and configured XWiki
=> XWiki Standard Flavor 11.10.2
Has not created SQL Indexes as mentioned at:
https://www.xwiki.org/xwiki/bin/view/Documentation/AdminGuide/Performances/Database%20Administration/
=> In the Main Wiki i’ve created the SQL indexes
Created a page with following content:
{{chart type="pie" source="inline" params="range:B2-D5;series:columns;" title="Chart Test" width="320" height="240"}} |=|=X|=Y|=Z |Q1|1.2|3.4|1.3 |Q2|4.5|3.4|2.3 |Q3|1.2|4.5|9.0 |Q4|3.4|1.2|1.2 {{/chart}}
Got an error on this page:
Failed to execute the [chart] macro. Cause: [Assistive Technology not found: org.GNOME.Accessibility.AtkWrapper].
-> Refresh page (F5) - got another error:
"...java.lang.NoClassDefFoundError: Could not initialize class org.jfree.chart.JFreeChart..."
Tried out the solution from https://github.com/microsoft/vscode-arduino/issues/644
sudo nano /etc/java-8-openjdk/accessibility.properties
commendted out (deactivated):
"assistive_technologies=org.GNOME.Accessibility.AtkWrapper"
sudo systemctl restart tomcat9
OK! Chart from the test page is now visible:
Installed “Statistics Application 11.10.2”
Activated "xwiki.stats" in "/etc/xwiki/xwiki.cfg"
“xwiki.stats.default=1”
sudo systemctl restart tomcat9
OK! Chart at the “Current Month Activity” section is now also visible:
HI Vincent, @vmassol
Could you please share the solution at the comment section of the “chart macro” extension?
This topic can be closed as solved 
Thanks a lot!
Best regards,
Dolo
Would be great if you could crate a jira issue about that on https://jira.xwiki.org/browse/XWIKI with the details you indicated here.
Hi Thomas,
sure will create an jira issue for this.
Thanks!
Best regards,
Dolo
Hi,
i’ve created an jira issue for this topic at:
Best regards,
Dolo
Hi!
On debian 10.2 distribution x86-64 package java-11-openjdk this line already commented. In debian sid java-8-openjdk this line still uncommented.
Maybe you have to open bug at your linux distriro?