Detail the implementation method of adjusting Tomcat startup parameters under Windows

Adjust the Tomcat startup parameters under Windows

By default, Tomcat has 128MB, which is not enough for applications with a lot of access and a lot of memory. We can increase the amount of memory available for Tomcat by adjusting the startup parameters of the Java virtual machine.

The following two parameters are well known

-Xms<size>  JVM Initializes the heap size 
-Xmx<size>  JVM Maximum heap size 

For example, I want to set the initial memory size to 128M, up to 1G, as follows:

-Xms128m
-Xmx1024m

Under Linux/Unix, JAVA_OPTS can be achieved by adding or modifying JAVA_OPTS in {tomcat_dir}/bin/ catalina.sh:

JAVA_OPTS="-Xms128m -Xmx1024m"

The installation-free version of Windows can be achieved by adding or modifying JAVA_OPTS in {tomcat_dir}/bin/ catalina.bat:

set JAVA_OPTS=-Xms128m -Xmx1024m

But the service launcher Tomcat7 I installed on Windows doesn't have the bin/ catalina.bat file, so how do I change that?

The answer is: Modify the registry.

Run regedit

Find the registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Apache Software Foundation

Move on to Procrun 2.0\Tomcat7\Parameters\Java

There's an Options setting

-Dcatalina.home=C:\Program Files\Apache Software Foundation\Tomcat 7.0
-Dcatalina.base=C:\Program Files\Apache Software Foundation\Tomcat 7.0
-Djava.endorsed.dirs=C:\Program Files\Apache Software Foundation\Tomcat 7.0\endorsed
-Djava.io.tmpdir=C:\Program Files\Apache Software Foundation\Tomcat 7.0\temp
-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
-Djava.util.logging.config.file=C:\Program Files\Apache Software Foundation\Tomcat 7.0\conf\logging.properties

Double-click it to edit and add the following two lines at the end:

-Xms128M
-Xmx1024M

Different versions of Tomcat require different registry keys to be adjusted

Such as:

Tomcat5 is

HKEY_LOCAL_MACHINE\SOFTWARE\Apache Software Foundation\Tomcat Service Manager\Tomcat5\Parameters\JavaOptions

Tomcat6 is

HKEY_LOCAL_MACHINE\SOFTWARE\Apache Software Foundation\ Procrun 2.0\Tomcat6\Parameters\Java

Tomcat7 is

HKEY_LOCAL_MACHINE\SOFTWARE\Apache Software Foundation\ Procrun 2.0\Tomcat7\Parameters\Java

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