--- a/test/jdk/java/net/httpclient/ConcurrentResponses.java	Mon Feb 05 15:51:09 2018 +0000
+++ b/test/jdk/java/net/httpclient/ConcurrentResponses.java	Mon Feb 05 17:18:26 2018 +0000
@@ -217,6 +217,9 @@
             // Muck any data beyond the give limit, since there shouldn't
             // be any of interest to the HTTP Client.
             for (ByteBuffer buffer : buffers) {
+                if (buffer.isReadOnly())
+                    continue;
+
                 if (buffer.limit() != buffer.capacity()) {
                     final int limit = buffer.limit();
                     final int position = buffer.position();