How do you set mutliple memory parameters in Catalina.bat?

[Jerry Haines]

I have been trying to get the Memory parameters set in Catalina.bat for Tomcat starting in a command window.

I need a start of -Xms1536m -Xmx2048m.

I am able to use the Set JAVA_OPTS= -Xms1536m to pass one parameter, which works and Tomcat starts my WAR files.

When I try two parameters at the same time, I get heap errors and unpredicable responses.

Below are several different attempts that did not work.

I am using Vista with 4G of RAM.

rem set JAVA_OPTS = '-Xms1536m -Xmx2048m' did not work
rem SET JAVA_OPTS = '-Xmn1536m -Xmx2048m' did not work
rem set JAVA_OPTS='-Xms1536m -Xmx2048m' did not work
rem set JAVA_OPTS= '-Xms1536m' did not work
rem set JAVA_OPTS='Xms1536m' did not work

set JAVA_OPTS=-Xms1536m

rem set JAVA_OPTS=-Xms1536m This one works to start web services on 2010-05-31

[Rob Spoor]

Moving to our Tomcat forum.

[Tim Holloway]

Try using double-quotes instead of single quotes. That is:

SET JAVA_OPTS="-Xms1536m -Xmx2048m"

[William Brogden]

Is this a Vista thing? I have used

 set JAVA_OPTS=-Xms64m -Xmx100m   

in catalina.bat for Windows XP for years.

Bill

[Jerry Haines]

Thank you each for your reply.

They were helpful in the trouble shooting. It turns out that single quotes or double quotes are not the solution. However, when testing I got the message during shutdown of a startup - - Incompatible initial and maximum heap sizes specified.

As I continued to trouble shoot this I found the following website and notes.

website http://javahowto.blogspot.com/2006/06/6-common-errors-in-setting-java-heap.html

• Only setting -Xms JVM option and its value is greater than the default maximum heap size, which is 64m. The default minimum heap size seems to be 0. For example,
java -Xms128m BigApp
Error occurred during initialization of VM
Incompatible initial and maximum heap sizes specified
The correct command should be java -Xms128m -Xmx128m BigApp. It's a good idea to set the minimum and maximum heap size to the same value. In any case, don't let the minimum heap size exceed the maximum heap size.


I then experimented with multiple combination and discovered that for this Vista with 4 G of RAM that when I exceed 1536m the tomcat server will not start or will crash with heap errors.
My working solution was to set the JAVA_OPTS= -Xms1536m -Xmx1536m. This repeatly worked. No single quotes or double quotes. Quotes or double quotes also caused errors.

When I moved 1536 to 2048 then the tomcat server would not start.

Again thank you all.