java.io.NotSerializableException: com.ysoft.jdo.book.voting.VotingPeriod

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Bug or DUE attempting navigation to Date field in query

com.ysoft.jdo.book.voting.VotingPeriod

java.io.NotSerializableException: com.ysoft.jdo.book.voting.VotingPeriod	at com.solarmetric.kodo.impl.jdbc.schema.dict.GenericDictionary.toSQL(GenericDictionary.java:122)	at com.solarmetric.kodo.impl.jdbc.runtime.JDBCExpressionFactory$Constant.(JDBCExpressionFactory.java:419)	at com.solarmetric.kodo.impl.jdbc.runtime.JDBCExpressionFactory.getConstant(JDBCExpressionFactory.java:213)	at com.solarmetric.kodo.query.FilterParser.eval(FilterParser.java:562)	at com.solarmetric.kodo.query.FilterParser.getValue(FilterParser.java:668)	at com.solarmetric.kodo.query.FilterParser.eval(FilterParser.java:601)	at com.solarmetric.kodo.query.FilterParser.getExpression(FilterParser.java:677)	at com.solarmetric.kodo.query.FilterParser.evaluate(FilterParser.java:527)	at com.solarmetric.kodo.query.QueryImpl.getExpression(QueryImpl.java:371)	at com.solarmetric.kodo.impl.jdbc.runtime.JDBCQuery.getExpression(JDBCQuery.java:49)	at com.solarmetric.kodo.query.QueryImpl.executeWithMap(QueryImpl.java:312)	at com.solarmetric.kodo.query.QueryImpl.executeWithArray(QueryImpl.java:393)	at com.solarmetric.kodo.query.QueryImpl.execute(QueryImpl.java:285)