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java.lang.IllegalArgumentException: Host name may not be null	at org.apache.http.HttpHost.(HttpHost.java:79)	at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:501)	at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:906)	at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:805)	at org.jets3t.service.impl.rest.httpclient.RestStorageService.performRequest(RestStorageService.java:320)	at org.jets3t.service.impl.rest.httpclient.RestStorageService.performRequest(RestStorageService.java:265)	at org.jets3t.service.impl.rest.httpclient.RestStorageService.performRestGet(RestStorageService.java:966)	at org.jets3t.service.impl.rest.httpclient.RestStorageService.performRestGet(RestStorageService.java:938)	at org.jets3t.service.impl.rest.httpclient.RestStorageService.listAllBucketsImpl(RestStorageService.java:1344)	at org.jets3t.service.StorageService.listAllBucketsImpl(StorageService.java:1406)	at org.jets3t.service.StorageService.listAllBuckets(StorageService.java:590)	at org.jets3t.service.S3Service.listAllBuckets(S3Service.java:1313)	at undefined.WalrusConnection.main(WalrusConnection.java:34)