The java command supports a wide range of options:

• All options start with a single hyphen or minus-sign (\\-): the GNU/Linux convention of using -- for “long” options is not supported.
• Options must appear before the <classname> or the -jar <jarfile> argument to be recognized. Any arguments after them will be treated as arguments to be passed to Java app that is being run.
• Options that do not start with -X or -XX are standard options. You can rely on all Java implementations1 to support any standard option.
• Options that start with -X are non-standard options, and may be withdrawn from one Java version to the next.
• Options that start with -XX are advanced options, and may also be withdrawn.

Setting system properties with -D

The -D<property>=<value> option is used to set a property in the system Properties object. This parameter can be repeated to set different properties.

Memory, Stack and Garbage Collector options

The main options for controlling the heap and stack sizes are documented in http://stackoverflow.com/documentation/java/2804/java-memory-management/18190/setting-the-heap-permgen-and-stack-sizes. (Editorial note: Garbage Collector options should be described in the same topic.)

Enabling and disabling assertions

The -ea and -da options respectively enable and disable Java assert checking:

• All assertion checking is disabled by default.
• The -ea option enables checking of all assertions
• The -ea:<packagename>... enables checking of assertions in a package and all subpackages.
• The -ea:<classname>... enables checking of assertions in a class.
• The -da option disables checking of all assertions
• The -da:<packagename>... disables checking of assertions in a package and all subpackages.
• The -da:<classname>... disables checking of assertions in a class.
• The -esa option enables checking for all system classes.