当我将SolrJ添加到Grails 3.2.4中时，并且在创建客户端时，我得到java.lang.NoClassDefFoundError: org/apache/http/impl/conn/PoolingHttpClientConnectionManager
我添加的依赖项：
compile group: 'org.apache.solr', name: 'solr-solrj', version: '7.5.0'
堆栈跟踪如下：
Caused by: java.lang.NoClassDefFoundError: org/apache/http/impl/conn/PoolingHttpClientConnectionManager
at org.apache.solr.client.solrj.impl.HttpClientUtil.createPoolingConnectionManager(HttpClientUtil.java:260)
at org.apache.solr.client.solrj.impl.HttpClientUtil.createClient(HttpClientUtil.java:255)
at org.apache.solr.client.solrj.impl.HttpSolrClient.<init>(HttpSolrClient.java:200)
at org.apache.solr.client.solrj.impl.HttpSolrClient$Builder.build(HttpSolrClient.java:951)
at (TestController.groovy:40)
... 14 common frames omitted
Caused by: java.lang.ClassNotFoundException: org.apache.http.impl.conn.PoolingHttpClientConnectionManager
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 19 common frames omitted
知道为什么会这样吗？