Jato VM
Jato is an implementation of the Java virtual machine. It includes a VM and a JIT compiler for the x86 machine architecture and supports the JNI API. Jato uses Boehm GC as its garbage collector and relies on GNU Classpath to provide essential Java APIs.
Features
- JIT-only execution on x86 architecture
- Uses GNU Classpath for essential classes
- Boehm garbage collector
- Runs on Linux
Installation
Prerequisites
Fedora
$ sudo yum install ecj libffi-devel binutils-devel glib2-devel bison llvm-devel llvm-static
Ubuntu
$ sudo apt-get install ecj libffi-dev binutils-dev libiberty-dev libglib2.0-dev bison llvm-dev
Archlinux
$ pacman -S eclipse-ecj classpath libffi
GNU Classpath
GNU Classpath needs to be built and installed from sources.
First install dependencies that are required to build GNU Classpath:
Fedora
$ sudo yum install java-1.7.0-openjdk antlr GConf2-devel gtk2-devel gettext-devel texinfo
Ubuntu
$ sudo apt-get install openjdk-6-jdk antlr libgconf2-dev libgtk2.0-dev ecj fastjar pccts
Then clone the sources from the git repository (the release 0.99 appears to be broken)
git clone git://git.savannah.gnu.org/classpath.git
You can then compile GNU Classpath:
$ ./autogen.sh
$ ./configure --disable-Werror --disable-plugin
$ make
and install it to /usr/local:
$ sudo make install
Build and Install
To compile the VM and run all the tests:
$ make check
All tests should pass.
You can now install Jato with:
$ make install
The command installs an executable jato to $HOME/bin.
Usage
Jato uses the same command line options as java.
To run a class:
$ jato <class name>
To specify classpath, use:
$ jato -cp <jar files or directories> <class name>
You can also execute a Jar file with:
$ jato -jar <jar file>
Jato also supports variety of command line options for debugging and tracing
purposes. See the file Documentation/options.txt for details.
License
Copyright © 2005-2013 Pekka Enberg and contributors
Jato is distributed under the 2-clause BSD license.