12.1 Standard Properties

The following properties are normally found in all implementations of the core libraries for the Java language.

java.version

The libgcj version number.

java.vendor

Set to ‘The Free Software Foundation, Inc.’

java.vendor.url

Set to http://gcc.gnu.org/java/.

java.home

The directory where gcj was installed. Taken from the --prefix option given to configure.

java.class.version

The class format version number supported by the libgcj byte code interpreter. (Currently ‘46.0’)

java.vm.specification.version

The Virtual Machine Specification version implemented by libgcj. (Currently ‘1.0’)

java.vm.specification.vendor

The name of the Virtual Machine specification designer.

java.vm.specification.name

The name of the Virtual Machine specification (Set to ‘Java Virtual Machine Specification’).

java.vm.version

The gcj version number.

java.vm.vendor

Set to ‘The Free Software Foundation, Inc.’

java.vm.name

Set to ‘GNU libgcj’.

java.specification.version

The Runtime Environment specification version implemented by libgcj. (Currently set to ‘1.3’)

java.specification.vendor

The Runtime Environment specification designer.

java.specification.name

The name of the Runtime Environment specification (Set to ‘Java Platform API Specification’).

java.class.path

The paths (jar files, zip files and directories) used for finding class files.

java.library.path

Directory path used for finding native libraries.

java.io.tmpdir

The directory used to put temporary files in.

java.compiler

Name of the Just In Time compiler to use by the byte code interpreter. Currently not used in libgcj.

java.ext.dirs

Directories containing jar files with extra libraries. Will be used when resolving classes.

java.protocol.handler.pkgs

A ‘|’ separated list of package names that is used to find classes that implement handlers for java.net.URL.

java.rmi.server.codebase

A list of URLs that is used by the java.rmi.server.RMIClassLoader to load classes from.

jdbc.drivers

A list of class names that will be loaded by the java.sql.DriverManager when it starts up.

file.separator

The separator used in when directories are included in a filename (normally ‘/’ or ‘\’ ).

file.encoding

The default character encoding used when converting platform native files to Unicode (usually set to ‘8859_1’).

path.separator

The standard separator used when a string contains multiple paths (normally ‘:’ or ‘;’), the string is usually not a valid character to use in normal directory names.)

line.separator

The default line separator used on the platform (normally ‘\n’, ‘\r’ or a combination of those two characters).

policy.provider

The class name used for the default policy provider returned by java.security.Policy.getPolicy.

user.name

The name of the user running the program. Can be the full name, the login name or empty if unknown.

user.home

The default directory to put user specific files in.

user.dir

The current working directory from which the program was started.

user.language

The default language as used by the java.util.Locale class.

user.region

The default region as used by the java.util.Local class.

user.variant

The default variant of the language and region local used.

user.timezone

The default timezone as used by the java.util.TimeZone class.

os.name

The operating system/kernel name that the program runs on.

os.arch

The hardware that we are running on.

os.version

The version number of the operating system/kernel.

awt.appletWarning

The string to display when an untrusted applet is displayed. Returned by java.awt.Window.getWarningString() when the window is “insecure”.

awt.toolkit

The class name used for initializing the default java.awt.Toolkit. Defaults to gnu.awt.gtk.GtkToolkit.

http.proxyHost

Name of proxy host for http connections.

http.proxyPort

Port number to use when a proxy host is in use.