线程“main”中的exceptionjava.lang.NoClassDefFoundError：org / apache / commons / codec / DecoderException

我尝试通过Solrj查询Solr

这是我的代码

public class ReadFromSolr { public static void main(String[] args) throws MalformedURLException, SolrServerException { String url = "http://localhost:8983/solr"; try{ SolrServer server = new CommonsHttpSolrServer(url); ModifiableSolrParams params = new ModifiableSolrParams(); params.set("qt", "/select"); params.set("q", "name"); QueryResponse response = server.query(params); System.out.println("response = " + response); } catch (MalformedURLException ex) { ex.printStackTrace(); } catch (SolrServerException ex) { ex.printStackTrace(); } } 

}

它给了我一个例外

PS。 我的peoject中有以下jar子：

** apache – commons-logging，
* httpclient -4.2，
httpcore 4.2.1，slf4j – api 1.6.2，
apache – solr – solrj -1.4.0 ***

  Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/codec/DecoderException at org.apache.commons.httpclient.HttpMethodBase.(HttpMethodBase.java:220) at org.apache.commons.httpclient.methods.GetMethod.(GetMethod.java:89) at org.apache.solr.client.solrj.impl.CommonsHttpSolrServer.request(CommonsHttpSolrServer.java:288) at org.apache.solr.client.solrj.impl.CommonsHttpSolrServer.request(CommonsHttpSolrServer.java:243) at org.apache.solr.client.solrj.request.QueryRequest.process(QueryRequest.java:89) at org.apache.solr.client.solrj.SolrServer.query(SolrServer.java:118) at com.gismo.ReadFromSolr.main(ReadFromSolr.java:27) Caused by: java.lang.ClassNotFoundException: org.apache.commons.codec.DecoderException at java.net.URLClassLoader$1.run(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) 

Answer 1

你需要在类路径上使用commons-codec.jar 。