While the Java security architecture  can protect users and systems from hostile programs downloaded over a network, it cannot defend against implementation bugs that occur in code.
Such bugs can inadvertently open the very holes that the security architecture was designed to contain, including access to files, printers, webcams, microphones, and the network from behind firewalls.
In some cases, the property does not exist in a base instance, but can be added if you need to change the value.
Controls if header names in imported files can exceed 30 characters.
In severe cases local programs may be executed or Java security disabled.