When the Silverlight application uses pages the URL address is appended with the name of the page resource the user see. This has a security implication as it might allow a malicious user to access pages he is not allows to. The following video clip shows that.

Stable Values in Java (JEP 502): Deferred Immutability with JVM Trust
Explore Stable Values – a new Java 25 upcoming feature (JEP 502) enabling lazy initialization with immutable performance and JVM-level optimizations.