Snow leopard 10.6 ships with a JAva version that's not supported by the ASDM. You would need to force a downgrade to 1.5 or wait for the cisco release later this year that promises to fix the issue.
I found this snippit in the Apple forums that describe how to force the 1.5 downgrade and run the ASDM....
1. Install Java 1.5 per http://chxor.chxo.com/post
2. Download the ASDM.jnlp file and save it to your Desktop.
3. Open Terminal and Edit ~/Desktop/asdm.jnlp
4. In the <resources> section where the spec says
<j2se version="1.5+" initial-heap-size="64m" max-heap-size="256m"
set it to:
<j2se version="1.5" initial-heap-size="64m" max-heap-size="256m"
ie. DELETE THE PLUS.
That should get you a work around until the permanent fix from Cisco.
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by: lrmoorePosted on 2009-10-25 at 10:11:57ID: 25657304
Are you using the latest versions of both ASDM and Java?