小编use*_*029的帖子

我的程序包含以下行,并且此时挂起,我不太清楚为什么.

PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager();

在Eclipse中调试时,如果我尝试在Display视图中评估"new PoolingHttpClientConnectionManager()",我会收到以下错误:

java.lang.NoClassDefFoundError: org/apache/http/config/Lookup
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Unknown Source)
    ...omitted - referring to specific lines in code...
    at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.apache.http.config.Lookup
    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)
    ... 10 more

我正在使用org.apache.httpcomponents中的httpclient.jar版本4.3.1.

其他人遇到这个问题？有解决方案吗 或者我在做些傻事？