How to increase the Java Heap size in Tomcat Application Server

Description

To increase the Java heap size in Tomcat, follow the instructions below:

1. Go to <Tomcat Home Directory>/bin and create a file named setenv.sh for Linux systems or setenv.bat for Windows.
   
2. Inside the setenv file, use the following format to set the heap size using the following parameters:
    
   

Linux:

  export CATALINA_OPTS="-Xms4096M -Xmx4096M"

  set CATALINA_OPTS=-Xms4096M -Xmx4096M

In recent versions on Windows, you can instead set this in the Tomcat interface: 

1. Go to Start > All Programs > Apache Tomcat x.x > Configure Tomcat.

Alternatively, please run:
c:\Program Files (x86)\Common Files\Strategy\Tomcat\apache-tomcat-9.0.xx\bin\tomcat9w.exe
 

1. Go to the Java tab and specify a maximum memory pool:

1. Save the changes and startup or restart Tomcat.

 
Remember that the memory used will decrease available RAM on the machine. This may lead to performance issues if set too high, so set the value with care. For additional information on optimizing Tomcat memory usage, please refer to:
https://cwiki.apache.org/confluence/display/TOMCAT/Memory .