RFR 8199437 [11]Improve diagnostic system assertion message in com.sun.net.httpserver impl

[Chris Hegarty]

An odd assertion has been observed in the com.sun.net
HTTP Server code, that is currently unexplainable. I'd
like to add some additional diagnostics information to
the assertion so that it may be more helpful if seen
again.


--- a/src/jdk.httpserver/share/classes/sun/net/httpserver/ServerImpl.java
+++ b/src/jdk.httpserver/share/classes/sun/net/httpserver/ServerImpl.java
@@ -408,7 +408,9 @@
                                      }
                                      handle (chan, conn);
                                  } else {
-                                    assert false;
+                                    assert false : 
String.format("Unexpected non-readable key, where "
+                                        + " key's channel:%s, 
isValid:%b, interestOps:%d, readyOps:%d",
+                                        key.channel(), key.isValid(), 
key.interestOps(), key.readyOps());
                                  }
                              } catch (CancelledKeyException e) {
                                  handleException(key, null);

-Chris.