I'd like to add a little bit specifically around setting the parameters for a Windows service.
It can be done, but as Chris pointed out, it's not easy. There are at least 2 ways I can think of off the top of my head to change the Windows service properties: 1. Write JNI code to call the appropriate Windows DLLs to access and update the registry. Not fun... and potentially problematic because of security requirements. 2. Use Java to write a Windows .reg file that can be imported using an OS call to import the file. This is almost trivial to do but it's technically a bit of a kludge and has the same security problems (albeit a bit simpler) than option 1. FYI: The advantage of a Windows service is that it can be made to start when the OS starts, which can be really handy... it can also be a pain depending on your requirements :). The option we use is calling VBScript to do the registry changes, but that doesn't involve Java at all. Bill -----Original Message----- From: Christopher Schultz [mailto:ch...@christopherschultz.net] Sent: June 30, 2011 10:10 PM To: Tomcat Users List Subject: Re: Set Java VM arguments programmatically in Tomcat -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Anand, On 6/30/2011 6:18 PM, Anand HS wrote: > Basically I would like not to use any batch scripts ( in Windows ) to set > CATALINA_OPTS, JAVA_OPTS etc.. , instead would like to do it through a > custom Java program and then hook up. You can do this, except that your Java program must launch /a second JVM/ in order to set properties -- specifically ones such as heap sizes, etc. > To this effect, I was wondering if > there is a way to extend Bootstrap class of Tomcat to achieve it. No. By the time the Bootstrap code is called, the heap has been configured and it's too late. > That said, I'm not sure if it is a recommended way to do it even since I was > trying to just explore if batch files are the only options for me to feed in > environment variables to Tomcat and Java. If you install Tomcat as a service, you can set those parameters in the service definition (itself a small program that launches the JVM with the proper parameters) and do anything you want. But you'll never be able to do this in any practical way through Java code. - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk4NLJEACgkQ9CaO5/Lv0PDQkwCgpPUIvxzVxB72RHxgdFHUW1aO LGoAnioYym9HOjaRA5tYH7CKfeKfg/Mk =4skK -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
