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Porting JVM to MINX

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# 1  
Old 12-14-2012
Porting JVM to MINIX
Hi,
As you may see from the title, for some reason I need to make running .class files on Minix possible (a compiler is not necessary). So could somebody point me in any direction, suggest some literature or give some advice? Generally, how would you do it?
Also how big is this project? I guess I should port openJDK and make some kind of interpreter. But I never did something similar. (I'm CS student on second year)

I have also read Tanenbaum's "operating systems design and implementation". It gave me a lot of insight of minix internals.


Thanks in advance
Last edited by John117; 12-14-2012 at 09:43 AM..
# 2  
Old 12-14-2012
Go to the oracle site and see if there is java for your architecture. It won't do any good to write java code without a Java Virtual Machine. This is actually the system-specific piece you need. It may be part of a JDK for your box. I do not know.

If it exists, then everything is a simple install.

The only word of caution is that some releases of the jvm have had issues in UNIX.
Check out via reviews what you are getting before you install it.
# 3  
Old 12-15-2012
there is java for my architecture its x86.. I found jamVM, does anybody have any tips for porting it to unix?
# 4  
Old 12-15-2012
JamVM is probably the best option for your task assuming you are prepared to port/write some assembly code.
Another issue is JamVM relies on Posix threads but Minix doesn't implement them. You might have a look to JAmiga (A port of JamVM to Amiga) which managed to overcome that issue.
# 5  
Old 12-15-2012
thank you for JAmiga hope it will help, but isn't Minix a POSIX standard os?

EDIT: could I strip JamVM of any threads? I don't need java threads, lets say ill use just single threaded apps. Could JVM be just one process without taking care of threads inside? Its a college project if I manage to execute one System.out it would be miracle Smilie . No really is it possible to strip the jvm threads?
Last edited by John117; 12-15-2012 at 04:01 PM..
# 6  
Old 12-17-2012
Quote:
Originally Posted by John117
thank you for JAmiga hope it will help, but isn't Minix a POSIX standard os?
It might be but POSIX Threads is an optional feature.
Quote:
could I strip JamVM of any threads? I don't need java threads, lets say ill use just single threaded apps. Could JVM be just one process without taking care of threads inside? Its a college project if I manage to execute one System.out it would be miracle Smilie . No really is it possible to strip the jvm threads?
Not really. Java is inherently multi-threaded, even if your application is not.
# 7  
Old 12-18-2012
Thanks again, sorry for bothering you but do you think that is possible to port openJDK to minix?
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