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 java.awt.AWTError: Assistive Technology not found: org.GNOME.Accessibility.AtkWrapper · Issue #644 · microsoft/vscode-arduino · GitHub
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 java.awt.AWTError: Assistive Technology not found: org.GNOME.Accessibility.AtkWrapper · Issue #644 · microsoft/vscode-arduino · GitHub
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 Loading... with the details you indicated here.
Hi Thomas,
sure will create an jira issue for this.
Thanks!
Best regards,
Dolo
Thanks @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?
When I exporting PDF file,similar issue occured.I solved the issue following this method
