solving java.lang.ClassFormatError: Field "has inconsistent hierarchy" in class

From: hiwa (HGA03630_at_nifty.ne.jp)
Date: 12/29/04 

Date: 29 Dec 2004 01:24:42 -0800

One probable cause is that your compiler version and JRE version that
Tomcat uses are different. For example, 1.5 vs. 1.4.