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java.lang.IllegalArgumentException: Host name may not be null	at org.apache.http.HttpHost.(	at org.apache.http.impl.client.DefaultRequestDirector.execute(	at org.apache.http.impl.client.AbstractHttpClient.execute(	at org.apache.http.impl.client.AbstractHttpClient.execute(	at	at	at	at	at	at org.jets3t.service.StorageService.listAllBucketsImpl(	at org.jets3t.service.StorageService.listAllBuckets(	at org.jets3t.service.S3Service.listAllBuckets(	at undefined.WalrusConnection.main(