ClassCastException while use jpa annotation in resin-pro-3.0.19

the app was works in 3.0.18, but failed in 3.0.19,
because of the javax.persistence package in {resin-home}/lib/ejb30.jar

i get a ClassCastException while obtain EntityManagerFactory from 
javax.persistence.Persistence.createEntityManagerFactory(...), it was
 because difference ClassLoader cause that exception

what's the sequence of Class Resolve in a webapp, i think it should be
jdk-rt -> WEB-INF/classes -> WEB-INF/lib -> ResinServerLibs

uppon the ClassCastException, i think resin-pro's sequence was
jdk-rt -> WEB-INF/classes -> ResinServerLibs -> WEB-INF/lib

how can i resolve this problem, or report a bug?