Had to add the commons-lang to the "preferred application packages" section of weblogic.xml to get this fixed.
<container-descriptor>
<prefer-application-packages>
<package-name>org.apache.commons.lang.*</package-name>
</prefer-application-packages>
<optimistic-serialization>true</optimistic-serialization>
<show-archived-real-path-enabled>true</show-archived-real-path-enabled>
</container-descriptor>