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我有一個類別文檔，它由Id (int)和Url (String)組成。我想在Id上有一個主要索引，在Url上有二級索引。我也想爲Id自動增加一個序列。所以我創建了一個SecondaryDatabase，然後我創建了一個Sequence。在序列的初始化我得到一個異常：Berkeley DB JE Base API輔助數據庫和序列的問題
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)
看來序列的初始化過程中的輔助數據庫被強制進行更新。當我調試MyDocumentBiding的entryToObject方法時，它嘗試轉換爲對象的字節看起來是隨機的。
我在做什麼錯？