Add an example to InstantiationException

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@276832 13f79535-47bb-0310-9956-ffa450edef68

docs/faq.html

@@ -1129,6 +1129,14 @@ shell-prompt> m4 foo.m4 > foo
           A version of this problem happens with jars that are in the classpath
           that include an embedded copy of ant classes.
           An example of this is some copies of weblogic.jar.
+        </p>
+                        <p>
+        One can check if this is the case by doing (on unix/sh):
+        <code><pre>
+        unset CLASSPATH
+        ant -version
+        </pre>
+        </code>
         </p>
                     <p class="faq">
       <a name="NoClassDefFoundError"></a>

xdocs/faq.xml

@@ -808,6 +808,14 @@ shell-prompt> m4 foo.m4 > foo
           that include an embedded copy of ant classes.
           An example of this is some copies of weblogic.jar.
         </p>
+        <p>
+        One can check if this is the case by doing (on unix/sh):
+        <code><pre>
+        unset CLASSPATH
+        ant -version
+        </pre>
+        </code>
+        </p>
       </answer>
     </faq>