JAVA_OPTS may use by Other applications, but only Tomcat will use CATALINA_OPTS. So if you're setting environment variables for use only by Tomcat, you'll be best advised to use CATALINA_OPTS, whereas if you're setting environment variables to be used by other java applications as well, you should put your settings in JAVA_OPTS.
What can go in there!
You can increase heap memory available to the JVM.
You can open remote monitoring ports so that Jconsole on another system can watch how your Tomcat is running.
You can add in a -server to switch from the client (quicker start, slower running) JVM to the server (slower starting, quicker running) JVM.
You can increase java thread stack size using the -Xss option (same way to specify amount of memory as in -Xms and -Xmx as described in the "increase heap memory" link above.
for more visit : http://www.sanjeevrathaur.com/2015/10/javaopts-variable-details.html
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JAVA_OPTS and CATALINA_OPTS are environment variables commonly used when configuring Java applications and Apache Tomcat. JAVA_OPTS can contain JVM options that may also be relevant to other Java applications, while CATALINA_OPTS is specifically intended for Tomcat. Therefore, when configuring memory, monitoring, JVM mode, or thread stack settings specifically for Tomcat, CATALINA_OPTS is generally the more targeted choice.
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A clear and practical explanation of the difference between CATALINA_OPTS and JAVA_OPTS. The distinction is especially useful for understanding how JVM settings can be applied specifically to Tomcat or more broadly to Java applications. The examples related to memory allocation, server mode, and thread stack configuration also make the topic easier to understand and apply in real-world environments.
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