I am trying to run my java project from cmd and taking back this error:
**Exception in thread "main" java.lang.ClassCastException: class [B cannot be cast to class [C ([B and [C are in module java.base of loader 'bootstrap')
at jodd.util.UnsafeUtil.getChars(UnsafeUtil.java:67)
at jodd.json.JsonParser.parse(JsonParser.java:201)
at IndexTester.main(IndexTester.java:78)**
import java.io.File;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.util.Map;
import jodd.json.JsonParser;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.TextField;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.LeafReader;
import org.apache.lucene.index.SlowCompositeReaderWrapper;
import org.apache.lucene.index.Terms;
import org.apache.lucene.index.TermsEnum;
import org.apache.lucene.queryparser.classic.ParseException;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.apache.lucene.queryparser.simple.SimpleQueryParser;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
public class IndexTester {
public static void main(String[] args) throws IOException, ParseException {
if (args.length != 3) {
System.err.println("Incorrect number of arguments! Usage:");
System.err.println("");
System.err.println("java IndexTester should_clear_index path_to_data path_to_index ");
System.err.println("\tif should_clear_index is \"1\", the index will be rebuilt. Otherwise, it will try and use an existing index.");
System.err.println("\tpath_to_index should point to an empty directory somewhere.");
System.exit(-1);
}
String shouldClearIndex = args[0];
String inputPath = args[1]; // where to find the file containing the JSON to index
String idxDirPath = args[2]; // where to put/find the Lucene index we want to search
File inputFile = new File(inputPath);
// set up analyzer:
StandardAnalyzer analyzer = new StandardAnalyzer();
// set up the index
File idxDir = new File(idxDirPath);
Directory dir = FSDirectory.open(idxDir.toPath());
if (shouldClearIndex.compareTo("1") == 0) {
System.out.println("Rebuilding index...");
IndexWriterConfig idxConfig = new IndexWriterConfig(analyzer);
idxConfig.setOpenMode(IndexWriterConfig.OpenMode.CREATE);
IndexWriter idxWriter = new IndexWriter(dir, idxConfig);
// Now, populate the index:
int idx = 0;
JsonParser jParser = new JsonParser();
for (String line : Files.readAllLines(inputFile.toPath(), StandardCharsets.UTF_8)) {
// On large amounts of data, this can take a while
if (idx % 10000 == 0) {
System.out.println(idx);
}
idx++;
// each line of the input file is a serialized JSON object
Map j = jParser.parse(line);
// simple types (strings, numbers, etc.) are handled like so:
String title = (String)j.get("title");
// complex types (lists or dicts) get turned into instances of
// java.util.Map and java.util.List.
String ab = (String)j.get("abstract");
// Look at the docs for TextField to see about other types- Lucene can index numbers, dates, etc.
Field tiField = new Field("title", title, TextField.TYPE_STORED);
// The TYPE_STORED directive tells Lucene to actually store the original token in the index. This is handy
// for all sorts of reasons!
// set up any additional fields here
Document thisDoc = new Document();
thisDoc.add(tiField);
// add our document to the index
idxWriter.addDocument(thisDoc);
}
System.out.println("Done!");
System.out.println(idx + " documents indexed.");
idxWriter.close();
}
do {
// Open up the index for querying:
DirectoryReader reader = DirectoryReader.open(dir);
// Tell me about the index (comment in/out as needed- this may be useful for debugging):
// LeafReader slowC = SlowCompositeReaderWrapper.wrap(reader);
// Terms idxTerms = slowC.terms("title"); // change to a different field as needed
// TermsEnum tEnum = idxTerms.iterator(null);
// System.out.println("Terms in the index for the title field:");
// while (tEnum.next() != null) {
// String s = tEnum.term().utf8ToString();
// System.out.println(s + "\t" + tEnum.docFreq());
// }
// Now search
IndexSearcher searcher = new IndexSearcher(reader);
// Things to note re: QueryParser:
// 1. The first argument is the "default" field to search-
// if nothing else is specified, in the query, this is what
// will be searched.
// 2. You always want to make sure to use the same Analyzer for your
// query as you did when you built the index!
//
// Other query parser classes will behave similarly, but may have different argument ordering.
QueryParser qParser = new QueryParser("title", analyzer);
System.out.print("Query: ");
String queryText = System.console().readLine();
if (queryText.compareTo("") != 0) {
Query q = qParser.parse(queryText);
TopDocs results = searcher.search(q, 10);
System.out.println("Got " + results.totalHits + " hits!");
for (ScoreDoc d : results.scoreDocs) {
System.out.println(d.doc + "\t" + d.score);
Document res = reader.document(d.doc);
System.out.println(res.getField("title").stringValue());
}
}
} while (true); // keep querying until user hits ctrl-C
}
}
This is my code and thiis is my .txt file: [https://openeclass.uom.gr/modules/document/file.php/DAI148/%CE%94%CE%B9%CE%AC%CE%BB%CE%B5%CE%BE%CE%B7%2006%20-%20%CE%94%CE%B9%CE%B1%CE%B2%CE%B1%CE%B8%CE%BC%CE%B9%CF%83%CE%BC%CE%AD%CE%BD%CE%B7%20%CE%91%CE%BD%CE%AC%CE%BA%CF%84%CE%B7%CF%83%CE%B7%2C%20%CE%9C%CE%BF%CE%BD%CF%84%CE%AD%CE%BB%CE%BF%20%CE%94%CE%B9%CE%B1%CE%BD%CF%85%CF%83%CE%BC%CE%B1%CF%84%CE%B9%CE%BA%CE%BF%CF%8D%20%CE%A7%CF%8E%CF%81%CE%BF%CF%85/Using%20Lucene/data.txt.zip]
Please switch to the latest Jodd JSON v6.
There is probably an issue with the
UnsafeUtil.getChars. What you can do is the following:i.e. to skip using the
UnsafeUtil.getChars().The new version of Jodd is not using the Unsafe class anymore.