Java on Yun?

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Is it possible install Java on the Yun?

I've had a look in the package manager:

opkg list | grep java

Nothing came up, I thought I'd seen references to using Java and I've read about JArduino being a java library. Is there a guide or FAQ on how to install Java on the Yun?

Thank you,
Simon Platten

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Ok, found some information on JamVM, also using SSH:

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opkg list | grep jamvm

shows:

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jamvm - 1.6.0-git-2 - JamVM is a new Java Virtual Machine which conforms to the JVM specification version (blue book). In comparison to most other VM's (free  and commercial) it is extremely small.However, unlike other small VMs  (e.g. KVM) it is designed to support the full specification, and includes  support for object finalisation, Soft/Weak/Phantom References, the Java  Native Interface (JNI) and the Reflection API.

However when I try:

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opkg install jamvm

I get:

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Collected errors:
 * verify_pkg_installable: Only have 7316kb available on filesystem /overlay, pkg classpath needs 8634
 * opkg_install_cmd: Cannot install package jamvm.

I have an 8GB micro SD card inserted into the Yun, can I download the java virtual machine to the micro SD card?

Not a linux wizard, so any help would be gratefully received.

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This is a useful site:
http://tavendo.com/blog/post/arduino-yun-with-autobahn/

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Whilst I have now mounted the sda1 as /opt I still can't install jamvm onto the SD card, when I try to specify a destination I get error messages:

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Collected errors:
 * resolve_pkg_dest_list: Unknown dest name: `/opt/'.

How do I do this?

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This was helpful:
http://forum.arduino.cc/index.php?topic=221148.0

Edited opkg.conf and added a mapping:

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dest sd /opt

Then I was able to install the jamvm onto the SD card using:

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opkg install jamvm -d sd

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It would appear that the Yun keeps restarting, probably due to a watchdog? Is there a way to disable the watchdog or determine the reason for the reboot?

Thank you,