betwixt0.6とdigester1.6のエラー

commons loggingを使うときの注意は、他のjakarta libの出力も拾うこと?(無効にできるはずだけどわかりません。)
betwixt0.6とdigester1.6の組み合わせで、以下のようなエラーが出る。
log出力しなければ問題なし。

[DEBUG] org.apache.commons.digester.Digester.java:1055 - Popping body text ''
[DEBUG] org.apache.commons.digester.Digester.java:1065 - Fire end() for org.apache.commons.betwixt.io.BeanRuleSet$ActionMappingRule@12611a7
[ERROR] org.apache.commons.digester.Digester.java:1069 - End event threw exception
java.lang.ClassCastException
at org.apache.commons.betwixt.io.read.ReadContext.getCurrentElement(ReadContext.java:224)
at org.apache.commons.betwixt.io.read.BeanBindAction.update(BeanBindAction.java:164)
at org.apache.commons.betwixt.io.read.BeanBindAction.end(BeanBindAction.java:154)
at org.apache.commons.betwixt.io.BeanRuleSet$ActionMappingRule.end(BeanRuleSet.java:316)
at org.apache.commons.digester.Digester.endElement(Digester.java:1067)
at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)