fixed exception handling in Connection (issue #110)

Author: mpv1989

ChangeLog

@@ -1,6 +1,7 @@
 v4.1.11 (2017-03-xx)
 ---------------------------
 * added convenience methods (ArangoDatabase.arango(), ArangoCollection.db(), ArangoGraph.db())
+* fixed exception handling in Connection (issue #110)
 
 v4.1.10 (2017-02-22)
 ---------------------------

src/main/java/com/arangodb/internal/velocystream/Connection.java

@@ -186,7 +186,8 @@ private synchronized void sendProtocolHeader() throws IOException {
 		outputStream.flush();
 	}
 
-	protected synchronized void writeIntern(final Message message, final Collection<Chunk> chunks) {
+	protected synchronized void writeIntern(final Message message, final Collection<Chunk> chunks)
+			throws ArangoDBException {
 		for (final Chunk chunk : chunks) {
 			try {
 				if (LOGGER.isDebugEnabled()) {
@@ -209,7 +210,7 @@ protected synchronized void writeIntern(final Message message, final Collection<
 				}
 				outputStream.flush();
 			} catch (final IOException e) {
-				throw new RuntimeException(e);
+				throw new ArangoDBException(e);
 			}
 		}
 	}