public constructor, better message reporting on failure

taskdefs/src/org/aspectj/tools/ant/taskdefs/AjcTask.java

@@ -118,7 +118,7 @@ public class AjcTask extends MatchingTask {
     private boolean verbose;
     private boolean failonerror;
     
-    AjcTask() {
+    public AjcTask() {
     	reset();
     }
 

taskdefs/testsrc/org/aspectj/tools/ant/taskdefs/AjcTaskTest.java

@@ -244,7 +244,13 @@ public class AjcTaskTest extends TestCase {
         
         private void check(IMessageHolder holder, int num, IMessage.Kind kind) {
             if (num != IGNORE) {
-                assertEquals(num, holder.numMessages(kind, false));
+            	int actual = holder.numMessages(kind, false);
+            	if (num != actual) {
+            		if (actual > 0) {
+	            		MessageUtil.print(System.err, holder, "expected " + num + " got " + actual);
+            		}
+	                assertEquals(num, actual);
+            	}
             }
         }
     }