Must use JDK 7 to build 3.0.1?

Hi,

When I tried to build 3.0.1 with JDK 6, I got an error from maven javac:
invalid target release: 1.7. And I checked pom.xml, found
<targetJdk>1.7</targetJdk>. Does 3.0.1 use any JDK 7 specific feature?

Yours Sincerely,

Zhang Wei(张巍)
WAS Web Service Development, China Software Development Lab, IBM GCG
E-mail: weiz [ at ] cn.ibm.com
Tel: 86-10-82453958
3/F, Ring Building, Dongbeiwang West Road No.8, ShangDi, Beijing 100193,
PRC