java“NoSuchMethodError”是什么意思？

1 月，2 周 Questions & Answers 67

我仍然坚持用Jena和Lucene搜索文本。在我编译它之后，它得到了一些错误，在我修复一个错误之后，它总是显示另一个错误。我的完整代码如下：

public class JenaTextSearch {

static {LogCtl.setLog4j();
    BasicConfigurator.configure();}
static Logger log = LoggerFactory.getLogger("JenaTextSearch");



public static void main (String ...argv)
{
    Dataset ds = createCode();
    //loadData(ds, "data.ttl");
    queryData(ds);

}

public static Dataset createCode()
{
    //base data
    Dataset ds1 = DatasetFactory.create();
    Model defaultModel = ModelFactory.createDefaultModel();
    defaultModel.read("to_index/data.ttl", "N-TRIPLES");
    ds1.setDefaultModel(defaultModel);


    //define the index mapping
    EntityDefinition entDef = new EntityDefinition ("uri", "text", ResourceFactory.createProperty(App.URI_PREFIX,"content"));

    Directory dir = null;

    try {
        dir = new SimpleFSDirectory(Paths.get("index")); //lucene index directory
    }
    catch (IOException e) {
        e.printStackTrace();
    }

    //join together into a dataset
    Dataset ds = TextDatasetFactory.createLucene(ds1, dir, new TextIndexConfig(entDef));

    return ds1;

}

public static void queryData(Dataset dataset)
{
    String prefix = "PREFIX email: <" + App.URI_PREFIX+">" +
            "PREFIX text: <http://jena.apache.org/text#>";

    long startTime = System.nanoTime();
    System.out.println("Email's content contains 'good'");
    String query = "SELECT * WHERE " +
            "{ ?s text:query (email:content 'good'." +
            " ?s email:content ?text . " +
            " }" ;

    dataset.begin(ReadWrite.READ);
    try {
        Query q = QueryFactory.create(prefix+"\n"+query);
        QueryExecution qexec = QueryExecutionFactory.create(q, dataset);
        QueryExecUtils.executeQuery(q, qexec);
    }finally { dataset.end();}
    long finishTime = System.nanoTime();
    double time = (finishTime-startTime)/1.0e6;
    System.out.println ("Query "+String.format("FINISH - %.2fms", time));

    startTime = System.nanoTime();
    System.out.println("Email's content contains 'bad'");
    query = "SELECT * WHERE" +
            "{ (?s ?score ?lit) text:query (email:content 'bad' \"highlight:s:<em class='hiLite'> | e:</em>\") ." +
            " ?s email:content ?text . " +
            " }" ;

    dataset.begin(ReadWrite.READ);

    try {
        Query q = QueryFactory.create(prefix+"\n"+query);
        QueryExecution qexec = QueryExecutionFactory.create(q, dataset);
        QueryExecUtils.executeQuery(q, qexec);
    } finally { dataset.end() ; }
    finishTime = System.nanoTime();
    time = (finishTime-startTime)/1.0e6;
    System.out.println("Query "+String.format("FINISH - %.2fms",  time));
}}

上次编译后的错误描述显示：Exception in thread "main" java.lang.NoSuchMethodError: org.apache.lucene.analysis.AnalyzerWrapper: method <init>()V not found

“NoSuchMethodError”是什么意思？我是否跳过一个Lucene库？请告诉我。多谢各位

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