Which version of JBT do you use?
Steps to reproduce?
I'm using JBoss Tools - 3.1.1.v201006011046R-H111-GA and Eclipse Platform SDK 3.5.2.M20100211-1343
by starting eclipse
Hi, I think the problem in jar parcing implementation. May be you have broken jars in your project?
Could you provide for us you project libraries? Or at least library list?
all used libraries are in tomcat\lib\