Lucene-加载时MemoryIndex引发异常

Question

我开始使用lucene。我使用lucene 8.1.1 在创建类MemoryIndex时，程序将引发异常。

我添加了库引用： lucene内存8.1.1 lucene-core-8.1.1

import org.apache.lucene.index.memory.MemoryIndex;

public class RunTest {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        MemoryIndex mi = new MemoryIndex();
    }

}

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/lucene/index/memory/MemoryIndex
    at RunTest.main(RunTest.java:8)
Caused by: java.lang.ClassNotFoundException: org.apache.lucene.index.memory.MemoryIndex
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:583)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
    ... 1 more