It could be useful to avoid that each user, on a multiuser operating system,
have own java cache under his home directory, i.e. a corporate
application used by each user. Every time the jnlpi is upgraded, every
user have to download the new version in his home directory cache.
Using system level cache, only the first user launching the jnlpi will download the java application in the cache.
vi /usr/java/jre/lib/deployment.config
deployment.system.config file:/etc/java/deployment.properties
vi /etc/java/deployment.properties
deployment.system.cachedir /var/tmp/java/wscache
deployment.system.security.trusted.certs /var/tmp/java/security/trusted.certs
mkdir /var/tmp/java
mkdir /var/tmp/java/wscache
Warning. There will be problems with write and read permission on such directory...