Improve some error handling to clean up the catalina log.

webapp/src/edu/cornell/mannlib/vitro/webapp/controller/api/VitroApiServlet.java

@@ -3,6 +3,7 @@
 package edu.cornell.mannlib.vitro.webapp.controller.api;
 
 import java.io.IOException;
+import java.io.OutputStreamWriter;
 import java.io.PrintWriter;
 import java.util.Collection;
 
@@ -86,19 +87,29 @@ public class VitroApiServlet extends HttpServlet {
 	protected void sendShortResponse(int statusCode, String message,
 			HttpServletResponse resp) throws IOException {
 		resp.setStatus(statusCode);
-		PrintWriter writer = resp.getWriter();
+		PrintWriter writer = getWriter(resp);
 		writer.println("<H1>" + statusCode + " " + message + "</H1>");
 	}
 
 	protected void sendShortResponse(int statusCode, String message,
 			Throwable e, HttpServletResponse resp) throws IOException {
+		log.warn("Unexpected exception: " + e, e);
 		sendShortResponse(statusCode, message, resp);
-		PrintWriter writer = resp.getWriter();
+		PrintWriter writer = getWriter(resp);
 		writer.println("<pre>");
 		e.printStackTrace(writer);
 		writer.println("</pre>");
 	}
 
+	private PrintWriter getWriter(HttpServletResponse resp) throws IOException {
+		try {
+			return resp.getWriter();
+		} catch (IllegalStateException e) {
+			return new PrintWriter(new OutputStreamWriter(
+					resp.getOutputStream()));
+		}
+	}
+
 	// ----------------------------------------------------------------------
 	// Helper classes
 	// ----------------------------------------------------------------------

webapp/src/edu/cornell/mannlib/vitro/webapp/filestorage/serving/FileServingServlet.java

@@ -117,13 +117,15 @@ public class FileServingServlet extends VitroHttpServlet {
 			try {
 				in.close();
 			} catch (Exception e) {
-				e.printStackTrace();
+				log.warn("Serving " + request.getRequestURI()
+						+ ". Failed to close input stream.", e);
 			}
 			if (out != null) {
 				try {
 					out.close();
 				} catch (Exception e) {
-					e.printStackTrace();
+					log.warn("Serving " + request.getRequestURI()
+							+ ". Failed to close output stream.", e);
 				}
 			}
 		}