OnWorks favicon

gcj-dbtool - Online in the Cloud

Run gcj-dbtool in OnWorks free hosting provider over Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

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.


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.

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.

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.

Use gcj-dbtool online using onworks.net services

Free Servers & Workstations

Download Windows & Linux apps

  • 1
    A fast tunnel proxy that helps you
    bypass firewalls This is an application
    that can also be fetched from
    It ha...
    Download Shadowsocks
  • 2
    GLPI Themes
    GLPI Themes
    Download release at
    Color themes for GLPI 0.84 and 0.85 New
    Modifications for GLPI This is an
    application that c...
    Download GLPI Themes
  • 3
    SMPlayer is a free media player for
    Windows and Linux with built-in codecs
    that can also play YouTube videos. One
    of the most interesting features of
    Download SMPlayer
  • 4
    AAX to MP3
    AAX to MP3
    Usage: - Install the Audible Manager
    and open a file of your account. - Sign
    in into your audible account (in the
    application). Now the program can
    convert you...
    Download AAX to MP3
  • 5
    TestLink is a web based Test Management
    tool. The application provides Test
    specification, Test plans and execution,
    Reporting, Requirements specification
    and ...
    Download TestLink
  • 6
    XDXF - XML Dictionary Exchange Format
    XDXF - XML Dictionary Exchange Format
    XDXF is a project to unite all existing
    open dictionaries and provide both users
    and developers with universal XML-based
    format, convertible from and to other ...
    Download XDXF - XML Dictionary Exchange Format
  • 7
    Transmission Remote GUI
    Transmission Remote GUI
    Transmission Remote GUI is a feature
    rich cross platform front-end to
    remotely control a Transmission
    Bit-Torrent client daemon via its RPC
    protocol. Transmissi...
    Download Transmission Remote GUI
  • More »

Linux commands