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mariuss's post in How to remove a logger from the log settings page was marked as the answer November 25, 2013

Sorry, it is not mentioned in the section of Log Settings Page but at the begin of the chapter 7.1 Configuration Settings in the User Interface. You can remove loggers from Repository/System Properties/GlobalPropertiesList.

Marius
mariuss's post in [SOLVED][JasperReports Server] Handler processing failed; nested exception is java.lang.OutOfMemoryError: Java heap space was marked as the answer October 30, 2013

Hello JonReport,

- check your JVM startup parameters
sudo service tomcat7 status # to find out your pid
sudo jmap -J-d64 -heap pid # -J-d64 for a 64-bit System, to print info about heap memory

- try to understand environment variables in ubuntu

- take a look at the differences between JAVA_OPTS and CATALINA_OPTS
- decide how to change the JAVA_OPTS(there are some ways)
I do it in /etc/default/tomcat7, e.g.: