ClassNotFoundException HttpRequestInterceptor

Question

I am getting this weird exception on this line:

HttpSolrServer server = new  HttpSolrServer("http://localhost:8080/solr/");

Stack trace:

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/http/HttpRequestInterceptor
    at com.polgar.dipl.index.SolrIndex.init(SolrIndex.java:36)
    at com.polgar.dipl.index.SolrIndex.getInstance(SolrIndex.java:30)
    at com.polgar.dipl.main.ArticleIndexer.main(ArticleIndexer.java:44)
Caused by: java.lang.ClassNotFoundException: org.apache.http.HttpRequestInterceptor
    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)
    ... 3 more

Answer 1

Getting the same problem. We both must be playing with Solr 3.6

I had to download the HttpClient jars from the HttpComponents project. They didn't seem to be included with Solr 3.6

http://hc.apache.org/downloads.cgi

3.6 Has a new version of the client that uses the new HttpComponents (4.0) stuff, not the old HttpClient (3.1) stuff. The old 3.1 jar is there, but not the new one.

Once I copied the jars over, it worked.

I copied the following (not all may be needed).

httpclient-4.1.3.jar
httpclient-cache-4.1.3.jar
httpcore-4.1.4.jar
httpmime-4.1.3.jar

works for me, now.

Answer 2

If you are using Maven to include SOLRJ, you'll also want the following phrases in your POM:

<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.2.1</version>
</dependency>
<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpmime</artifactId>
    <version>4.2.1</version>
</dependency>