diff --git a/WHATSNEW b/WHATSNEW
index 1136c46d5..aadefeb4a 100644
--- a/WHATSNEW
+++ b/WHATSNEW
@@ -211,6 +211,7 @@ Other changes:
   As it tests for the implementation, it can be used to check for optional
   tasks being available. 
 
+* check for 1.5.* ant main class. (weblogic.jar in classpath reports)
 
 Changes from Ant 1.6.3 to Ant 1.6.4
 ===================================
diff --git a/src/main/org/apache/tools/ant/launch/Launcher.java b/src/main/org/apache/tools/ant/launch/Launcher.java
index 8afd0710a..80fcd410f 100644
--- a/src/main/org/apache/tools/ant/launch/Launcher.java
+++ b/src/main/org/apache/tools/ant/launch/Launcher.java
@@ -243,10 +243,17 @@ public class Launcher {
 
         URLClassLoader loader = new URLClassLoader(jars);
         Thread.currentThread().setContextClassLoader(loader);
+        Class mainClass = null;
         try {
-            Class mainClass = loader.loadClass(MAIN_CLASS);
+            mainClass = loader.loadClass(MAIN_CLASS);
             AntMain main = (AntMain) mainClass.newInstance();
             main.startAnt(newArgs, null, null);
+        } catch (InstantiationException ex) {
+            System.out.println(
+                "Incompatible version of org.apache.tools.ant detected");
+            File mainJar = Locator.getClassSource(mainClass);
+            System.out.println(
+                "Location of this class " + mainJar);
         } catch (Throwable t) {
             t.printStackTrace();
         }