This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
If you downloaded and installed the ".exe" version of tomcat and you chose to install the "start menu items", you can configure the memory by clicking Start -> All Programs -> Apache Tomcat -> Configure Tomcat -> Java (tab), and filling out the "Intial Memory Pool" and "Maximum Memory Pool" fields.
If your app does have a memory leak, increasing the JVM heap size will only postpone the inevitable. Most memory leaks in a Java Web App are the result of connections not being returned to a connection pool. [ June 23, 2005: Message edited by: Ben Souther ]
Alternately, if you are executing startup.bat from a command prompt (which calls catalina.bat) you can set the JAVA_OPTS environment variable in the catalina.bat file with any of the Java command line options. (See the SDK tooldocs for the available options) Bill