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Minor Description
Current version of HBase uses MPL 1.1 which has legal restrictions. Newer versions of jamon-runtime appear to be MPL 2.0. HBase should upgrade to a safer licensed version of jamon.
2.4.0 is MPL 1.1 : http://grepcode.com/snapshot/repo1.maven.org/maven2/org.jamon/jamon-runtime/2.4.0
2.4.1 is MPL 2.0 : http://grepcode.com/snapshot/repo1.maven.org/maven2/org.jamon/jamon-runtime/2.4.1
Here’s a comparison of the equivalent sections of the respective licenses dealing w/ Termination:
MPL 1.1 - Section 8 (Termination) Subsection 2:
8.2. If You initiate litigation by asserting a patent infringement claim (excluding declatory judgment actions) against Initial Developer or a Contributor (the Initial Developer or Contributor against whom You file such action is referred to as "Participant") alleging that:
such Participant's Contributor Version directly or indirectly infringes any patent, then any and all rights granted by such Participant to You under Sections 2.1 and/or 2.2 of this License shall, upon 60 days notice from Participant terminate prospectively, unless if within 60 days after receipt of notice You either: 
agree in writing to pay Participant a mutually agreeable reasonable royalty for Your past and future use of Modifications made by such Participant, or (ii) withdraw Your litigation claim with respect to the Contributor Version against such Participant. If within 60 days of notice, a reasonable royalty and payment arrangement are not mutually agreed upon in writing by the parties or the litigation claim is not withdrawn, the rights granted by Participant to You under Sections 2.1 and/or 2.2 automatically terminate at the expiration of the 60 day notice period specified above.
any software, hardware, or device, other than such Participant's Contributor Version, directly or indirectly infringes any patent, then any rights granted to You by such Participant under Sections 2.1(b) and 2.2(b) are revoked effective as of the date You first made, used, sold, distributed, or had made, Modifications made by that Participant.
MPL 2.0 - Section 5 (Termination) Subsection 2:
5.2. If You initiate litigation against any entity by asserting a patent infringement claim (excluding declaratory judgment actions, counter-claims, and cross-claims) alleging that a Contributor Version directly or indirectly infringes any patent, then the rights granted to You by any and all Contributors for the Covered Software under Section 2.1 of this License shall terminate.