如何使用LuceNet Transform使用密码加密Lucene索引文件

我试图从HTML文件中创建Lucene索引数据，但它引发了一个异常 实际上我想用密码加密我的lucene索引。还有其他选择吗

     try{

       File outputdir=new File("path upto output directory");
       byte[] salt = new byte[16];
       String password = "lucenetransform";
       DataEncryptor enc = new DataEncryptor("AES/ECB/PKCS5Padding", password, salt,    128,false);
       DataDecryptor dec = new DataDecryptor(password, salt,false);

       IndexWriter indexwriter=new IndexWriter(new TransformedDirectory(FSDirectory.open(outputdir), enc, dec), new StandardAnalyzer(Version.LUCENE_36),true, IndexWriter.MaxFieldLength.LIMITED);


       }

       catch(Exception ex)
       {
         ex.printStackTrace();

       }

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异常是什么？“main”java.lang.AbstractMethodError中的异常：org.apache.lucene.store.Directory.openInput（Ljava/lang/String；）Lorg/apache/lucene/store/IndexInput；在org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run（SegmentInfos.java:620）在org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run（SegmentInfos.java:554）在org.apache.lucene.index.IndexWriter（IndexWriter.java:1127）在org.apache.lucene.index.IndexWriter上阅读（SegmentInfos.java:359）。（IndexWriter.java:926）位于indexcreatorinner.EncryptDirectory.main（EncryptDirectory.java:37）