compile java with external jar file in terminal

Question

Hi I want to compile java code in the terminal I enter the below command in terminal

javac -cp .:../../lucene-8.6.3/lucene-8.6.3/core/lucene-core-8.6.3.jar:../../lucene-8.6.3/lucene-8.6.3/analysis/common/lucene-analyzers-common-8.6.3.jar:../../lucene-8.6.3/lucene-8.6.3/queryparser/lucene-queryparser-8.6.3.jar IndexFiles.java

and i dont get any error, and after i enter below command to run:

java -cp .:../../lucene-8.6.3/lucene-8.6.3/core/lucene-core-8.6.3.jar:../../lucene-8.6.3/lucene-8.6.3/analysis/common/lucene-analyzers-common-8.6.3.jar:../../lucene-8.6.3/lucene-8.6.3/queryparser/lucene-queryparser-8.6.3.jar IndexFiles

but I get this error:

Error: Could not find or load main class IndexFiles
Caused by: java.lang.NoClassDefFoundError: lucene/IndexFiles (wrong name: IndexFiles)

what should I do? and what is my wrong?

and this is IndexFiles class

package lucene;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.*;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.IndexWriterConfig.OpenMode;
import org.apache.lucene.index.Term;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;

import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.nio.file.*;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.Date;

/** Index all text files under a directory.
 * <p>
 * This is a command-line application demonstrating simple Lucene indexing.
 * Run it with no command-line arguments for usage information.
 */
public class IndexFiles {
    ....

Konrad Rudolph · Accepted Answer · 2020-10-17T13:02:26.047

0

Since your class is in the package lucene, that’s the class name that you need to pass to java: it requires the fully qualified name.

CLASSPATH=../../lucene-8.6.3/lucene-8.6.3/core/lucene-core-8.6.3.jar:../../lucene-8.6.3/lucene-8.6.3/analysis/common/lucene-analyzers-common-8.6.3.jar:../../lucene-8.6.3/lucene-8.6.3/queryparser/lucene-queryparser-8.6.3.jar
java -cp ".:$CLASSPATH" lucene.IndexFiles

You’ll also need to make sure that the .class file is actually at the right location. In your case, that would be ./lucene/IndexFiles.class.

edited Oct 17 '20 at 13:02

answered Oct 17 '20 at 12:47

Konrad Rudolph

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is it possible to write complete command to i enter in terminal i am not profesional in java?thanks – fahim jafari Oct 17 '20 at 12:56
@fahimjafari OK, the command is complete now. These are two separate commands which you enter one after the other on the command line – Konrad Rudolph Oct 17 '20 at 13:02
error changed to this one: Error: Unable to initialize main class lucene.IndexFiles Caused by: java.lang.NoClassDefFoundError: org/apache/lucene/analysis/Analyzer – fahim jafari Oct 17 '20 at 13:06
and when i run this project in intellij it runs, but i need to run this in terminal – fahim jafari Oct 17 '20 at 13:08
thank you Konrad Rudolph i accepted your answer, but if you know what should i do with this new error, please help me /\ – fahim jafari Oct 17 '20 at 13:15
it is solved, the reason was i forgot to add .java to IndexFiles – fahim jafari Oct 17 '20 at 13:33

compile java with external jar file in terminal

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