Missing java.io imports
@@ -44,6 +44,8 @@ import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
import java.io.PrintStream;
import java.io.Serializable;
import java.net.MalformedURLException;
