In the menus, go to "Run" -> "Run Configurations..." Select the Apache Tomcat server you created. Switch to the "Arguments" tab. Under "VM Arguments" add in some text to increase the memory. I use this to give it more than it will ever need even though I have many webapps: "-Xmx2500m -Xms256m -XX:PermSize=700m -XX:MaxPermSize=2024m"
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