java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:721)
at org.apache.commons.httpclient.MultiThreadedHttpConnectionManager$HttpConnectionAdapter.open(MultiThreadedHttpConnectionManager.java:1361)
at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:387)
at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
at com.aol.test.HttpTest$PoolingHttpConnector.doGet(HttpTest.java:47)
at com.aol.test.HttpTest.main(HttpTest.java:17)

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