(gcj-4.4.info)Invoking gij

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4 Invoking gij
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`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.

`-cp PATH'
`-classpath PATH'
     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'.

`-noverify'
     Do not verify compliance of bytecode with the VM specification. In
     addition, this option disables type verification which is
     otherwise performed on BC-ABI compiled code.

`-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.

    `-XssSIZE'
          Set the thread stack 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', `-noclassgc', `-verify', and
`-verifyremote'.