Try to debug Jenkins test failure

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/net/trunk@1748167 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/test/java/examples/MainTest.java b/src/test/java/examples/MainTest.java
index bd18800..530acc5 100644
--- a/src/test/java/examples/MainTest.java
+++ b/src/test/java/examples/MainTest.java
@@ -68,7 +68,7 @@
             if (examples.exists()) {
                 scanForClasses(sourceFile.length(), examples, p);
             } else {
-                fail("Could not find examples classes");
+                fail("Could not find examples classes: " + examples.getCanonicalPath());
             }
         }
         return p;