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我有一个类别文档，它由Id (int)和Url (String)组成。我想在Id上有一个主要索引，在Url上有二级索引。我也想为Id自动增加一个序列。所以我创建了一个SecondaryDatabase，然后我创建了一个Sequence。在序列的初始化我得到一个异常：Berkeley DB JE Base API辅助数据库和序列的问题
Exception in thread "main" java.lang.IllegalArgumentException
at com.sleepycat.util.UtfOps.getCharLength(UtfOps.java:137)
at com.sleepycat.util.UtfOps.bytesToString(UtfOps.java:259)
at com.sleepycat.bind.tuple.TupleInput.readString(TupleInput.java:152)
at pl.edu.mimuw.zbd.berkeley.zadanie.rozwiazanie.MyDocumentBiding.entryToObject(MyDocumentBiding.java:12)
at pl.edu.mimuw.zbd.berkeley.zadanie.rozwiazanie.MyDocumentBiding.entryToObject(MyDocumentBiding.java:1)
at com.sleepycat.bind.tuple.TupleBinding.entryToObject(TupleBinding.java:76)
at pl.edu.mimuw.zbd.berkeley.zadanie.rozwiazanie.UrlKeyCreator.createSecondaryKey(UrlKeyCreator.java:20)
at com.sleepycat.je.SecondaryDatabase.updateSecondary(SecondaryDatabase.java:835)
at com.sleepycat.je.SecondaryTrigger.databaseUpdated(SecondaryTrigger.java:42)
at com.sleepycat.je.Database.notifyTriggers(Database.java:2004)
at com.sleepycat.je.Cursor.putNotify(Cursor.java:1692)
at com.sleepycat.je.Cursor.putInternal(Cursor.java:1616)
at com.sleepycat.je.Cursor.putNoOverwrite(Cursor.java:663)
at com.sleepycat.je.Sequence.<init>(Sequence.java:188)
at com.sleepycat.je.Database.openSequence(Database.java:546)
at pl.edu.mimuw.zbd.berkeley.zadanie.rozwiazanie.MyFullTextSearchEngine.init(MyFullTextSearchEngine.java:131)
at pl.edu.mimuw.zbd.berkeley.zadanie.testy.MyFullTextSearchEngineTest.main(MyFullTextSearchEngineTest.java:18)
看来序列的初始化过程中的辅助数据库被强制进行更新。当我调试MyDocumentBiding的entryToObject方法时，它尝试转换为对象的字节看起来是随机的。
我在做什么错？