java - java.lang.NoClassDefFoundError:com/fasterxml/jackson/core/JsonFactory即使添加了所需的导入后也出现此错误

这是我的代码。我添加了所有依赖项，然后也收到了此类错误。
google-http-client-jackson2-1.17.0-rc.jar

在此代码中获得上述错误时，在JsonFactory jsonFactory = new JacksonFactory（）;

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;
        }
    }

请建议我该如何解决。

最佳答案

直接回答问题（在Pavel的评论中得到回答）。杰克逊核心库依赖项缺失：
jackson-core- $ x.y.z.jar