错误简单示例lucene 4.0 with source(not jar lib)

Question

编辑:我找到了解决方案:编辑core.jar,删除除codec包之外的所有包并添加到构建路径,编解码包必须在jar中,不能是源代码我无法理解,这是非常的Lucene的简单代码,它与Lucene核心库一起运行,但是当我使用Lucene核心源时会导致错误.

public static void main(String[] args) throws IOException, ParseException {
    Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_CURRENT);

    // Store the index in memory:
    Directory directory = new RAMDirectory();
    // To store an index on disk, use this instead:
    // Directory directory = FSDirectory.open("/tmp/testindex");
    IndexWriterConfig config = new IndexWriterConfig(
            Version.LUCENE_CURRENT, analyzer);
    IndexWriter iwriter = new IndexWriter(directory, config);
    Document doc = new Document();
    String text = "This is the text to be indexed.";
    doc.add(new Field("fieldname", text, TextField.TYPE_STORED));
    iwriter.addDocument(doc);
    iwriter.close();

    // Now search the index:
    DirectoryReader ireader = DirectoryReader.open(directory);
    IndexSearcher isearcher = new IndexSearcher(ireader);
    // Parse a simple query that searches for "text":
    QueryParser parser = new QueryParser(Version.LUCENE_CURRENT,
            "fieldname", analyzer);
    Query query = parser.parse("text");
    ScoreDoc[] hits = isearcher.search(query, null, 1000).scoreDocs;
    // Iterate through the results:
    for (int i = 0; i < hits.length; i++) {
        Document hitDoc = isearcher.doc(hits[i].doc);
                System.out.println(hitDoc.get("fieldname"));
    }
    ireader.close();
    directory.close();
}

错误是:

 Exception in thread "main" java.lang.ExceptionInInitializerError
        at org.apache.lucene.index.LiveIndexWriterConfig.<init>(LiveIndexWriterConfig.java:118)
        at org.apache.lucene.index.IndexWriterConfig.<init>(IndexWriterConfig.java:145)
        at Test.main(Test.java:34)
    Caused by: java.lang.IllegalArgumentException: A SPI class of type org.apache.lucene.codecs.Codec with name 'Lucene40' does not exist. You need to add the corresponding JAR file supporting this SPI to your classpath.The current classpath supports the following names: []
        at org.apache.lucene.util.NamedSPILoader.lookup(NamedSPILoader.java:104)
        at org.apache.lucene.codecs.Codec.forName(Codec.java:95)
        at org.apache.lucene.codecs.Codec.<clinit>(Codec.java:122)
        ... 3 more

Answer 1

您必须将 Lucene jar 添加到类路径中。

如果这不起作用，请将 jar 复制到您的索引目录中，例如

java -cp app/luke/lukeall-4.0-dev.jar org.apache.lucene.index.CheckIndex data/solr/cores/collection1_0/data/index/

解压后的Web应用程序中的一些jar是为战争定制的，并且没有自己的MANIFEST目录。Luke jar 有代码并且是一个独立的 jar。

也可以看看：

LWE2.1中如何执行CheckIndex