java.lang.NoClassDefFoundError : com/fasterxml/jackson/core/JsonFactory getting this error even after adding the desired imports

Question

这是我的代码。我已经添加了所有依赖项，然后也收到这样的错误。google-http-client-jackson2-1.17.0-rc.jar

在此代码中，在 JsonFactory jsonFactory = new JacksonFactory();

处出现上述错误

import com.google.api.services.customsearch.Customsearch;
import com.google.api.services.customsearch.model.Search;
import com.google.api.services.customsearch.model.Result;
import com.google.api.client.http.HttpRequestInitializer;
import com.google.api.client.http.HttpRequest;
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.json.jackson2.JacksonFactory;

protected SearchResult[] doSearch() {


    HttpRequestInitializer httpRequestInitializer = new HttpRequestInitializer()
    {   
        @Override
        public void initialize(HttpRequest request) throws IOException {
        }
    };


    JsonFactory jsonFactory = new JacksonFactory();
    Customsearch csearch = new Customsearch( new  NetHttpTransport(),  jsonFactory,  httpRequestInitializer);
    Customsearch.Cse.List listReqst;


    try {
            listReqst = csearch.cse().list(query.getQueryString());
            listReqst.setKey(GOOGLE_KEY);
            // set the search engine ID got from API console
            listReqst.setCx("search engine ID"); 
            // set the query string
            listReqst.setQ(query.getQueryString());
            // language chosen is English for search results 
            listReqst.setLr("lang_en"); 
            // set hit position of first search result
            listReqst.setStart((long) firstResult);
            // set max number of search results to return
            listReqst.setNum((long) maxResults);
            //performs search
            Search result = listReqst.execute();
            java.util.List<Result> results =  result.getItems();
            String urls[] = new String [result.size()];
            String snippets[] = new String [result.size()];
            int i=0;
            for (Result r : results){
                urls[i] = r.getLink();
                snippets[i] = r.getSnippet();
                i++;
            }
            return getResults(snippets, urls, true);    
        } catch (IOException e) {
            // TODO Auto-generated catch block
            MsgPrinter.printSearchError(e);
            System.exit(1);
            return null;
        }
    }

请建议我如何修复它。

Answer 1

直接回答问题(Pavel 在评论中回答了)。 Jackson 核心库依赖项丢失:jackson-core-$x.y.z.jar