We also faced same issue after closely looking at the log and files I found that its a version conflict.
a application packaged war file has newer version of jaxb-impl-2.2.jar and weblogic has glassfish_jaxb220.127.116.11_2_2_4.jar
both has same package structure only version conflict. and due to this even by providing prefer-application-package/class does not help because
system classloader finds glassfish DatatypeConverterImpl which do not have theInstance field.
Currently checking with Oracle support if there is solution on this?