What are the defined J2ME system property names?

The various J2ME JSR documents define system property names that can be queried at runtime. These provide two services:

• To indicate the availability of an optional package:
  
  For example, if the device supports the Location API for J2ME then the property microedition.location.version will be present. The value associated with it will be "1.0", to indicate compliance with JSR 179.
  
  
• To provide platform-dependent configuration data
  
  For instance, the property microedition.commports is present in the MIDP 2.0 specification. Its value is a comma-separated list of ports you can use to build a URL, which the Generic Connection Framework can in turn use to create a javax.microedition.io.CommConnection object.

To query system properties use java.lang.System.getProperty(), as in:

	import	java.lang.*;

	String	value;
	String	key	= "microedition.pim.version";

	value	= System.getProperty( key );
	...

This table lists the defined system properties, drawing them from JSRs that are in the public review, final ballot, or final state, as defined in the Java Community Process (JCP):

J2ME Defined System Properties

¹(impl-dep) indicates that the default value is implementation-dependent.