"gij" is a Java bytecode interpreter included with "libgcj".
"gij" is not available on every platform; porting it requires a
small amount of assembly programming which has not been done for all the
targets supported by gcj.
The primary argument to "gij" is the name of a class or, with
"-jar", a jar file. Options before this argument are interpreted
by "gij"; remaining options are passed to the interpreted program.
If a class name is specified and this class does not have a "main"
method with the appropriate signature (a "static void" method with
a "String[]" as its sole argument), then "gij" will print an
error and exit.
If a jar file is specified then "gij" will use information in it to
determine which class' "main" method will be invoked.
"gij" will invoke the "main" method with all the remaining
command-line options.
Note that "gij" is not limited to interpreting code. Because
"libgcj" includes a class loader which can dynamically load shared
objects, it is possible to give "gij" the name of a class which has
been compiled and put into a shared library on the class path.
OPTIONS
"-cp
"-classpath
Set the initial class path. The class path is used for finding
class and resource files. If specified, this option overrides the
"CLASSPATH" environment variable. Note that this option is
ignored if "-jar" is used.
"-Dname[=value]"
This defines a system property named name with value value.
If value is not specified then it defaults to the empty string.
These system properties are initialized at the program's startup and can
be retrieved at runtime using the "java.lang.System.getProperty"
method.
"-ms=number"
Equivalent to "-Xms".
"-mx=number"
Equivalent to "-Xmx".
"-X"
"-Xargument"
Supplying "-X" by itself will cause "gij" to list all the
supported "-X" options. Currently these options are supported:
"-Xmssize"
Set the initial heap size.
"-Xmxsize"
Set the maximum heap size.
Unrecognized "-X" options are ignored, for compatibility with
other runtimes.
"-jar"
This indicates that the name passed to "gij" should be interpreted
as the name of a jar file, not a class.
"--help"
"-?"
Print help, then exit.
"--showversion"
Print version number and continue.
"--fullversion"
Print detailed version information, then exit.
"--version"
Print version number, then exit.
"-verbose"
"-verbose:class"
Each time a class is initialized, print a short message on standard error.
"gij" also recognizes and ignores the following options, for
compatibility with existing application launch scripts:
"-client", "-server", "-hotspot", "-jrockit",
"-agentlib", "-agentpath", "-debug", "-d32",
"-d64", "-javaagent" and "-noclassgc".
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.2 or
any later version published by the Free Software Foundation; with the
Invariant Sections being ``GNU General Public License'', the Front-Cover
texts being (a) (see below), and with the Back-Cover Texts being (b)
(see below). A copy of the license is included in the
man page gfdl(7) .
(a) The FSF's Front-Cover Text is:
A GNU Manual
(b) The FSF's Back-Cover Text is:
You have freedom to copy and modify this GNU Manual, like GNU
software. Copies published by the Free Software Foundation raise
funds for GNU development.
