Thread.dumpStack() circumvents whatever logging is configured and writes

directly to stderr. Logging an exception with the associated warning does the
right thing and logs the stack trace via the logging system.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@5318 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/presents/server/InvocationManager.java

@@ -165,15 +165,13 @@ public class InvocationManager
         _omgr.requireEventThread(); // sanity check
 
         if (marsh == null) {
-            log.warning("Refusing to unregister null marshaller.");
-            Thread.dumpStack();
+            log.warning("Refusing to unregister null marshaller.", new Exception());
             return;
         }
 
         if (_dispatchers.remove(marsh.getInvocationCode()) == null) {
             log.warning("Requested to remove unregistered marshaller? " +
-                        "[marsh=" + marsh + "].");
-            Thread.dumpStack();
+                        "[marsh=" + marsh + "].", new Exception());
         }
     }