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Alta: The Nested Process Model in Java
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Our microkernel-based research operating system,
Fluke,
was designed to provide strong, hierarchical resource
management through a process model we've designed, the
"nested process model." Our goal with
Alta
is to
provide a similar OS and process model for Java, using type-safety
instead of the MMU to provide protection.
We are using Kaffe as the
basis for our Alta, along with the Kore class library.
We aim to maintain backwards compatibility with "legacy" Java.
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Kaffe on the
OSKit
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We are using Kaffe and our OSKit to develop a stand-alone Java system that
uses the OSKit framework and its components (the FreeBSD protocol stack, device
drivers, etc.) to enable systems-level programming in Java.
Look at our OSKit and Kaffe downloads for using the recently-released OSKit with Transvirtual's Kaffe.
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Janos - a Java OS for Active Networks
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All of these projects are coming together, along with additional
research, to build a new operating system we call Janos.
Janos is an OSKit-based operating system containing a
special Java virtual machine and Java run-time, for
executing Java byte code. Janos puts particular emphasis on
local-node resource control and security. Although Janos
is relevant to any environment running
less-than-fully-trusted Java byte code, our focus is on the
needs of an active network node.
For a Janos project overview, see the new base Janos page, a short summary and these slides.
Software and Documentation We use MIT's Active Node Transfer System (ANTS) system as a component. To support resource management, we have made substantial, but still only a first round, of changes to ANTS 1.2. This version is still entirely user-mode based. We expect to release frequent updates for this version and would appreciate feedback.
You may download our June 1st release (315K gzip'ed tar file); our changes and their rationale are described in a document in html and Postscript formats. The API is documented in "javadoc" style.
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Kaffe and
Kore infrastructure work
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Kore is a freely available, clean-room re-implementation of
the Java core classes (the
java.*packages). We have provided the necessary infrastructure to Kaffe so that it can use the Kore libraries. This lets us experiment with changes to the Virtual Machine and the basic set of classes that it uses.We maintain a web page with news about Kore and patches for Kaffe.
The