Ant Tools 'java.lang.NoSuchMethodError

I am seeing this Ant Build Error. Any help here ?

[axis-java2wsdl] java.lang.NoSuchMethodError: org.apache.axis.encoding.DefaultTypeMappingImpl.getSingleton()Lorg/apache/axis/encoding/TypeMapping;
[axis-java2wsdl] at org.apache.axis.tools.ant.wsdl.Java2WsdlAntTask.execute(Java2WsdlAntTask.java:221)
[axis-java2wsdl] at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
[axis-java2wsdl] at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
[axis-java2wsdl] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
[axis-java2wsdl] at java.lang.reflect.Method.invoke(Method.java:597)
[axis-java2wsdl] at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
[axis-java2wsdl] at org.apache.tools.ant.Task.perform(Task.java:348)
[axis-java2wsdl] at org.apache.tools.ant.Target.execute(Target.java:390)
[axis-java2wsdl] at org.apache.tools.ant.Target.performTasks(Target.java:411)
[axis-java2wsdl] at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1399)
[axis-java2wsdl] at org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:38)

Looks like Ant is picking up the wrong JAR file for org.apache.axis.encoding.DefaultTypeMappingImpl. Dis you set CLASSPATH? If so, unset it and try again. Or do you have a copy of Axis in an endorsed directory? If so, remove it.

If neither of these help, set the ANT_OPTS env var to -verbose:class. Example:

ANT_OPTS=-verbose:class

Then run Ant again. This option causes the JVM to list each class loaded and the location of the JAR the class came from. Look at where the org.apache.axis.encoding.DefaultTypeMappingImpl class was loaded, that should give a a clue as to what is going on.