This is the command gcj-dbtool that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
gcj-dbtool - Manipulate class file mapping databases for libgcj
gcj-dbtool OPTION DBFILE [MORE] ...
gcj-dbtool [-0] [-] [-n] [-a] [-f]
[-t] [-l] [-p [LIBDIR]]
[-v] [-m] [--version] [--help]
"gcj-dbtool" is a tool for creating and manipulating class file mapping databases.
"libgcj" can use these databases to find a shared library corresponding to the bytecode
representation of a class. This functionality is useful for ahead-of-time compilation of
a program that has no knowledge of "gcj".
"gcj-dbtool" works best if all the jar files added to it are compiled using
Note that "gcj-dbtool" is currently available as "preview technology". We believe it is a
reasonable way to allow application-transparent ahead-of-time compilation, but this is an
unexplored area. We welcome your comments.
-n DBFILE [SIZE]
This creates a new database. Currently, databases cannot be resized; you can choose a
larger initial size if desired. The default size is 32,749.
-a DBFILE JARFILE LIB
-f DBFILE JARFILE LIB
This adds a jar file to the database. For each class file in the jar, a cryptographic
signature of the bytecode representation of the class is recorded in the database. At
runtime, a class is looked up by its signature and the compiled form of the class is
looked for in the corresponding shared library. The -a option will verify that LIB
exists before adding it to the database; -f skips this check.
[-][-0] -m DBFILE DBFILE,[DBFILE]
Merge a number of databases. The output database overwrites any existing database.
To add databases into an existing database, include the destination in the list of
If - or -0 are used, the list of files to read is taken from standard input instead of
the command line. For -0, Input filenames are terminated by a null character instead
of by whitespace. Useful when arguments might contain white space. The GNU find
-print0 option produces input suitable for this mode.
Test a database.
List the contents of a database.
-p Print the name of the default database. If there is no default database, this prints
a blank line. If LIBDIR is specified, use it instead of the default library directory
component of the database name.
Print a help message, then exit.
-v Print version information, then exit.
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