Updating java in linux
Shutdown hooks enable the orderly shutdown of a Java application by running user cleanup code (such as closing database connections) at shutdown, even if the JVM terminates abruptly. This reduces, by 50%, the amount of space required for Strings containing only single-byte characters.
Profiles the running program and sends profiling data to standard output.This option is provided as a utility that’s useful in program development and isn’t intended to be used in production systems.Reduces the use of operating system signals by the JVM. When this option is enabled, Java Strings containing only single-byte characters are internally represented and stored as single-byte-per-character Strings using ISO-8859-1 / Latin-1 encoding.This makes it easy to disable assertions in all classes except for system classes.The ) option applies to all class loaders and to system classes (which don’t have a class loader).