classes missing from distributed jar files

the class org.apache.xml.serialize.OutputFormat is missing from current jar files, producing errors like this:

java.lang.NoClassDefFoundError: org/apache/xml/serialize/OutputFormat
at com.atlassian.jira.action.admin.DataExport.writeXmlDocument(DataExport.java:127)
at com.atlassian.jira.action.admin.DataExport.writeFile(DataExport.java:96)
at com.atlassian.jira.action.admin.DataExport.execute(DataExport.java:73

apparently this class (and others) which are part of Xerces used to be packaged in a jar called ofbizcore-xerces-serialize.jar. that jar still exists, but it is missing at least the class above.