Java application to use maximum available memory in the system

Question

There are -Xmx and max-heap-size (jnlp) options to set maximum memory java application can use.
If these options are not specified application is permitted to use only s

Answer 1

-XX:DefaultMaxRAMFraction=1

bugs.sun.com
Sun's 1.5 JVM
Default Heap Size

Doesn't work for web start.